JPH07191380A - Barrier opening/closing mechanism - Google Patents

Barrier opening/closing mechanism

Info

Publication number
JPH07191380A
JPH07191380A JP33365793A JP33365793A JPH07191380A JP H07191380 A JPH07191380 A JP H07191380A JP 33365793 A JP33365793 A JP 33365793A JP 33365793 A JP33365793 A JP 33365793A JP H07191380 A JPH07191380 A JP H07191380A
Authority
JP
Japan
Prior art keywords
barrier
opening
state
closing mechanism
optical axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP33365793A
Other languages
Japanese (ja)
Inventor
Kazushige Ichino
市野一滋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP33365793A priority Critical patent/JPH07191380A/en
Publication of JPH07191380A publication Critical patent/JPH07191380A/en
Pending legal-status Critical Current

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  • Blocking Light For Cameras (AREA)
  • Structure And Mechanism Of Cameras (AREA)

Abstract

PURPOSE:To efficiently retreat a barrier without necessitating a complicated mechanism by setting the intersection of two circles drawn according to the state of the barrier and having a specified radius as the center of a shaft rotatably fitted in an opening/closing ring. CONSTITUTION:The positional relation between a sliding pin and a fitting pin 2-b is assumed as a state 2(open) where the barrier 2 shields a lighting hole 1-b and a state 2(close) where it is retreated most efficiently in terms of shape, that is, the diameter of a lens barrel is made small. Then, a circle having an optional radius R is drawn with center at the center 2-c of an optical axis in a state where the barrier 2 is closed. Furthermore, the circle having t.he radius R is drawn from the same position even in a state where the barrier 2 is opened. The intersection X-1 of the circles is set as the position of the fitting pin 2-b. By rorating a barrier rotating ring 3 in a state where the pin 2-b is at the position X-1, the barrier 2 is retreated with the rotation of the ring 3 and retreated at the position where space efficiency is the most excellent. At such a time, the sliding pin is guided by a slot lest the barrier 2 should be rotated.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はカメラのバリア開閉機構
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier opening / closing mechanism for a camera.

【0002】[0002]

【従来の技術】図8(a)〜図8(c)及び図9(a)
〜図9(c)によってバリア開閉機構を有するカメラの
従来例を説明する。図8(c)及び図9(c)はその構
造を表す断面図で、図8(b)及び図9(b)はバリア
開閉機構の斜視図、図8(a)及び図9(a)はバリア
の開閉機構を示す正面図である。
2. Description of the Related Art FIGS. 8 (a) -8 (c) and 9 (a)
9A to 9C, a conventional example of a camera having a barrier opening / closing mechanism will be described. 8 (c) and 9 (c) are cross-sectional views showing the structure, FIGS. 8 (b) and 9 (b) are perspective views of the barrier opening / closing mechanism, and FIGS. 8 (a) and 9 (a). FIG. 6 is a front view showing an opening / closing mechanism of a barrier.

【0003】図8はレンズ鏡筒の収納状態で、バリアは
閉じた状態であり、図9はワイド状態でレンズ鏡筒が繰
り出し、バリアが開いた状態を示している。
FIG. 8 shows a state in which the lens barrel is stored and the barrier is closed, and FIG. 9 shows a state in which the lens barrel is extended and the barrier is opened in a wide state.

【0004】先ず、図8(a)及び図9(a)を参照し
てバリア自体の開閉機構を説明する。本機構はバリア開
閉リング106の光軸を中心とする回転力を受けてバリ
ア107−a,107−bが開閉する構造になってい
る。バリア開閉リング106は引っ張りバネ114によ
って右回転に付勢されている。そして、バリア107−
a,107−bは回転軸107−dによって回転可能に
地板等(図中不図示)に取り付けられている。バリア1
07−a,107−bには腕部分107−cがあって、
その先端とバリア開閉リング106に渡って引っ張りバ
ネ116が掛けられていて、バリア107−a,107
−bを左回転に付勢している。さらに、バリア開閉リン
グ106にはストッパー106−cが植え込まれてい
て、腕部分107−cと当接している。以上の構成によ
って、バリア107−a,107−bはバリア開閉リン
グ106の左回転によって図8(a)のように閉じ、右
回転によって図9(a)のように開く。引っ張りバネ1
14によってバリア全体としては開き方向に付勢されて
いる。
First, the opening / closing mechanism of the barrier itself will be described with reference to FIGS. 8 (a) and 9 (a). This mechanism has a structure in which the barriers 107-a and 107-b are opened / closed by receiving a rotational force about the optical axis of the barrier opening / closing ring 106. The barrier opening / closing ring 106 is biased to the right by a tension spring 114. And the barrier 107-
The a and 107-b are rotatably attached to a main plate or the like (not shown in the figure) by a rotating shaft 107-d. Barrier 1
07-a and 107-b have arm portions 107-c,
A tension spring 116 is hung across the tip thereof and the barrier opening / closing ring 106, and the barriers 107-a, 107
-B is biased to the left. Further, a stopper 106-c is implanted in the barrier opening / closing ring 106 and is in contact with the arm portion 107-c. With the above configuration, the barriers 107-a and 107-b are closed as shown in FIG. 8A when the barrier opening / closing ring 106 is rotated counterclockwise, and are opened as shown in FIG. 9A when rotated clockwise. Extension spring 1
The entire barrier is urged by 14 in the opening direction.

【0005】図8(c)及び図9(c)には前述のバリ
ア開閉機構を有したズーム鏡筒付きカメラを示す。第一
のレンズ群101は第一のレンズ枠102によって保持
されている。第一のレンズ群101の合焦用繰り出し機
構及びシャッタ羽根104の開閉機構103は鏡筒10
5内に保持されている。その前にはバリア開閉リング1
06があり、鏡筒105内に回転可能に保持されてい
る。なお、バリア開閉リング106の回転方法について
は後述する。
8 (c) and 9 (c) show a camera with a zoom lens barrel having the above-mentioned barrier opening / closing mechanism. The first lens group 101 is held by the first lens frame 102. The focusing mechanism of the first lens group 101 and the opening / closing mechanism 103 of the shutter blades 104 are the lens barrel 10.
Held within 5. Barrier opening / closing ring 1 in front of it
06, which is rotatably held in the lens barrel 105. The method of rotating the barrier opening / closing ring 106 will be described later.

【0006】鏡筒105及び第二のレンズ群108を保
持している第二のレンズ枠109には各々複数本のカム
ピン105−a,109−aが植え込まれている。そし
て、そのカムピン105−a,109−aに摺動嵌合す
る長穴110−aを有した固定筒110が鏡筒105に
嵌合しており、鏡筒105と第二のレンズ枠109を回
転させずに光軸方向に案内する。該固定筒110はカメ
ラ本体112に固定されている。固定筒110の外周に
はカム筒111が嵌合され、該カム筒111には第一の
レンズ群101と第二のレンズ群108の光学的移動軌
跡を満足し、かつ沈胴動作を案内するカム溝111−a
及び111−bが形成され、該カム溝には前記カムピン
が係合している。カム筒111の外周面にはギア部11
1−cがあり、所定の減速機構を持ち且つカメラ本体1
12に固定されたモータ113によってカム筒111を
回転させる。
A plurality of cam pins 105-a and 109-a are embedded in the second lens frame 109 holding the lens barrel 105 and the second lens group 108, respectively. A fixed barrel 110 having an elongated hole 110-a slidably fitted to the cam pins 105-a and 109-a is fitted to the lens barrel 105, and the lens barrel 105 and the second lens frame 109 are connected to each other. Guide in the optical axis direction without rotating. The fixed barrel 110 is fixed to the camera body 112. A cam barrel 111 is fitted on the outer periphery of the fixed barrel 110, and the cam barrel 111 satisfies the optical movement loci of the first lens group 101 and the second lens group 108 and guides the collapsing operation. Groove 111-a
And 111-b are formed, and the cam pin is engaged with the cam groove. The gear portion 11 is provided on the outer peripheral surface of the cam cylinder 111.
1-c, has a predetermined deceleration mechanism, and has a camera body 1
The cam cylinder 111 is rotated by the motor 113 fixed to 12.

【0007】カム筒111の回転によって鏡筒105及
び第二のレンズ枠109は沈胴およびテレ・ワイド魔の
繰り出しを行う。そして、図8(c)の沈胴状態では鏡
筒105が完全にカメラ本体112に収納された状態に
なる。
The rotation of the cam barrel 111 causes the lens barrel 105 and the second lens frame 109 to be retracted and telescopically extended. In the collapsed state of FIG. 8C, the lens barrel 105 is completely housed in the camera body 112.

【0008】次にバリア開閉リング106の回転方法、
機構について図8(b)、図9(b)によって説明す
る。ただし、両図においては機能説明上複雑になる部品
については省略している。
Next, a method of rotating the barrier opening / closing ring 106,
The mechanism will be described with reference to FIGS. 8B and 9B. However, in both figures, parts that are complicated in terms of functional description are omitted.

【0009】バリア開閉リング106にはカム面106
−bを有した腕部分106−aがあり、その腕部分10
6−aと鏡筒105の所定の箇所105−cの間に引っ
張りバネ114が掛けてあってバリア開閉リング106
を図中右回転方向に付勢している。また、前述した、第
一のレンズ群101の沈胴、テレ・ワイド間の移動に伴
ってバリア開閉リング106と引っ張りバネ114は鏡
筒105と一体的に移動する。そして、バリア開閉リン
グ106の右回転でバリア107−a,107−bの開
き駆動を行い、逆に左回転で閉じ駆動を行う。
The barrier opening / closing ring 106 has a cam surface 106.
There is an arm portion 106-a having -b, and the arm portion 10-
A tension spring 114 is provided between 6-a and a predetermined portion 105-c of the lens barrel 105, and the barrier opening / closing ring 106
Is urged in the right rotation direction in the figure. Further, the barrier opening / closing ring 106 and the tension spring 114 move integrally with the lens barrel 105 as the first lens group 101 retracts and moves between the tele and wide angles as described above. Then, the barrier opening / closing ring 106 is rotated clockwise to open the barriers 107-a and 107-b, and conversely is rotated counterclockwise to close the barriers.

【0010】バリア開閉リング106の腕部分106−
aの光軸方向後方には固定カム板115があって、カメ
ラ本体112に固定されている。固定カム板115の先
端にはカム面115−aがあって、該カム面115−a
は腕部分106−aの先端に形成されたカム面106−
bと鏡筒105の沈胴位置近傍で係合するようになって
いる。
The arm portion 106 of the barrier opening / closing ring 106-
A fixed cam plate 115 is provided on the rear side in the optical axis direction of a and is fixed to the camera body 112. There is a cam surface 115-a at the tip of the fixed cam plate 115, and the cam surface 115-a
Is a cam surface 106- formed at the tip of the arm portion 106-a.
b is engaged with the lens barrel 105 near the retracted position.

【0011】以上の様な構成において、鏡筒105がワ
イドから沈胴状態になる過程において、バリア開閉リン
グ106のカム面106−bとカム板115のカム面1
15−aとの係合によって引っ張りバネ114の付勢力
に逆らってバリア開閉リング106が左回転されること
によりバリア107−a,107−bが閉じられる。
In the above-described structure, the cam surface 106-b of the barrier opening / closing ring 106 and the cam surface 1 of the cam plate 115 are in the process of retracting the lens barrel 105 from the wide state.
By engaging with 15-a, the barrier opening / closing ring 106 is rotated counterclockwise against the biasing force of the tension spring 114, thereby closing the barriers 107-a and 107-b.

【0012】なお、バリア開閉リング106等の回転す
る部材の回転力を受けて開閉するバリア機構としては、
前述した機構のもの以外にもたとえば実開平3−185
19号公報にはリンク機構を使ってバリアをスライドさ
せるバリア開閉機構が開示されている。
As a barrier mechanism that opens and closes by receiving the rotational force of a rotating member such as the barrier opening / closing ring 106,
In addition to the mechanism described above, for example, the actual Kaihei 3-185
Japanese Patent Laid-Open No. 19 discloses a barrier opening / closing mechanism that slides a barrier using a link mechanism.

【0013】[0013]

【発明が解決しようとする課題】カメラ使用状態におい
てはバリアはレンズ鏡筒前面の採光穴を遮らないように
退避する必要があるが、レンズ鏡筒直径に対し採光穴の
面積が大きくなるとバリアの退避スペースが小さくなる
ため、バリアを効率良く退避させることが必要になる。
When the camera is in use, the barrier needs to be retracted so as not to block the lighting hole on the front surface of the lens barrel. However, if the area of the lighting hole becomes larger than the diameter of the lens barrel, Since the evacuation space becomes smaller, it is necessary to evacuate the barrier efficiently.

【0014】従来、バリアの退避方法やバリアの形状に
ついて種々の提案がなされているが、以下には、そのう
ちの二例について説明する。
Conventionally, various proposals have been made regarding the method of retracting the barrier and the shape of the barrier, but two examples will be described below.

【0015】図10のように、採光穴105−dに対
し、対角方向でバリア107−a,107−bを分割す
ると、寸法Aが上下にくるように退避させる場合が最も
効率がよい。しかし、収納効率のみでバリアの移動軌跡
を考えると、図10では回転軸107−dが鏡筒105
の内壁に入り込んでしまう。従って、効率の良いバリア
退避は困難である。
As shown in FIG. 10, when the barriers 107-a and 107-b are divided diagonally with respect to the daylighting hole 105-d, it is most efficient to retract so that the dimension A is vertically. However, considering the movement path of the barrier only by the storage efficiency, in FIG. 10, the rotation axis 107-d is the lens barrel 105.
Enters the inner wall of the. Therefore, efficient barrier evacuation is difficult.

【0016】また、図11のように水平方向でバリア1
07−a,107−bを分割すると、退避スペースが小
さくてもバリアを収納することができるが、回転軸は無
限遠になければならず、機構として成立しない。また、
この様な場合には、実開平3−18519号公報のよう
なリンク機構によるスライド駆動方式が考えられるが、
リンク機構では多くの部品を使用しなければならず、光
軸方向の厚みが増してしまう。
Further, as shown in FIG. 11, the barrier 1 is arranged in the horizontal direction.
If 07-a and 107-b are divided, the barrier can be housed even if the retreat space is small, but the rotation axis must be at infinity, which is not a mechanism. Also,
In such a case, a slide drive system using a link mechanism as disclosed in Japanese Utility Model Laid-Open No. 3-18519 can be considered.
Many parts must be used in the link mechanism, and the thickness in the optical axis direction increases.

【0017】本発明の目的は、複雑な機構を必要とせ
ず、バリアを効率よく退避させることのできるバリア開
閉機構を提供することである。
It is an object of the present invention to provide a barrier opening / closing mechanism which can efficiently retract a barrier without requiring a complicated mechanism.

【0018】[0018]

【課題を解決するための手段】本発明は、以上の様な問
題を解決するために、中央に撮影光路のための採光穴を
あけ、裏面にバリア回動の案内のための長穴をあけた前
面化粧板と、バリアを回転可能に支持する穴(または
軸)を設け、回転駆動力を受けて光軸を中心として回転
するリング状のバリア開閉リングと、バリア開閉リング
の穴(または軸)に回転可能に嵌合する軸(または穴)
と、前面化粧板の長穴に摺動可能に嵌合する軸を備えた
複数のバリアと、を備えたバリア開閉機構において、閉
じた状態のバリアで光軸を中心として描かれる所定半径
の円と、収納効率良く、または、任意に退避収納された
バリアから同様に描かれる同半径の円との交点をバリア
開閉リングに回転可能に嵌合する軸(または穴)の中心
とすることによって、簡単な部品構成で、採光穴の大き
さに対し小さなスペースでバリアを退避させることを可
能にする。
According to the present invention, in order to solve the above problems, a light-collecting hole for a photographing optical path is formed in the center, and a long hole for guiding a barrier rotation is formed on the back surface. Front decorative plate and a hole (or shaft) that rotatably supports the barrier, and a ring-shaped barrier opening / closing ring that rotates about the optical axis when receiving a rotational driving force, and a hole (or shaft) for the barrier opening / closing ring. ) Rotatably fitted to the shaft (or hole)
And a barrier opening / closing mechanism including a plurality of barriers each having a shaft slidably fitted in the long hole of the front decorative plate, a circle having a predetermined radius drawn around the optical axis of the barrier in a closed state. And, by making the intersection of a circle with the same radius drawn in a similar manner from the barrier that is retracted and stored efficiently as the center of the shaft (or hole) that is rotatably fitted to the barrier opening / closing ring, With a simple component structure, it is possible to retract the barrier in a small space relative to the size of the lighting hole.

【0019】[0019]

【実施例】【Example】

<実施例1>図1〜図4によって本発明の第一実施例の
説明を行う。図2は本発明のバリア開閉機構の主要三部
品の正面図である。なお、本発明では、従来例で説明し
たバリア開閉リングの回転方法、つまりは沈胴力を利用
した特定の部品の回転方法は直接の関係はないので省略
する。図3に示すように、鏡筒1の内部Bにはレンズ、
シャッタ等の撮影機構が入っている。鏡筒1の前面にあ
る前面化粧板1−aには撮影光路用の採光穴1−bがあ
けられている。前面化粧板1−aの裏面には2箇所の長
穴1−cがあって、光軸を中心として点対称の位置にあ
る。化粧板1−aの後ろ側にはバリアがあって、バリア
2に埋め込まれた摺動ピン2−aが長穴1−cと摺動可
能に嵌合している。摺動ピン2−aとは向き及び位置が
ともに反対側に嵌合ピン2−bが埋め込まれていて、バ
リア開閉リング3にあけた穴3−aと回転可能に嵌合し
ている。バリア開閉リング3は鏡筒1に対し光軸を中心
に回転可能に固定されていて、従来例の様な方法によっ
て、沈胴力などを利用して回転する。
<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a front view of three main components of the barrier opening / closing mechanism of the present invention. In the present invention, the method of rotating the barrier opening / closing ring described in the conventional example, that is, the method of rotating a specific component using the collapsing force is not directly related and therefore omitted. As shown in FIG. 3, a lens is provided in the inside B of the lens barrel 1.
There is a shooting mechanism such as a shutter. A front decorative plate 1-a on the front surface of the lens barrel 1 is provided with a lighting hole 1-b for a photographing optical path. There are two elongated holes 1-c on the back surface of the front decorative plate 1-a, which are point-symmetrical with respect to the optical axis. There is a barrier behind the decorative plate 1-a, and the sliding pin 2-a embedded in the barrier 2 is slidably fitted in the elongated hole 1-c. A fitting pin 2-b is embedded on the side opposite in direction and position to the sliding pin 2-a, and is rotatably fitted in a hole 3-a formed in the barrier opening / closing ring 3. The barrier opening / closing ring 3 is fixed to the lens barrel 1 so as to be rotatable about the optical axis, and is rotated by utilizing the collapsing force or the like by the method of the conventional example.

【0020】次に、摺動ピン2−a、嵌合ピン2−bの
位置関係について図1を参照して説明する。先ず、バリ
ア2が採光穴1−bを遮った状態(2(開))と、その
バリア2の形状において最も効率良く退避できる、つま
り鏡筒直径が小さくできる状態(2(閉))を想定す
る。そして、バリア2が閉じた状態の時の光軸中心2−
cを中心に任意の半径(R)をもった円を描く。さらに
バリア2が開いた状態でも同様の位置から半径(R)の
円を描く。そして、その交点X−1、またX−2を嵌合
ピン2−bの位置とする。この位置(X−1,X−2)
に嵌合ピン2−bがあれば、バリア回転リング3が回転
すると、それに伴ってバリア2は退避し、最もスペース
効率の良い位置に退避可能となる。その時に、バリア2
が回転しないように、摺動ピン2−aを長穴1−cにガ
イドさせる。この時に、長穴1−cは直線である必要は
ない。
Next, the positional relationship between the sliding pin 2-a and the fitting pin 2-b will be described with reference to FIG. First, assume a state in which the barrier 2 blocks the lighting hole 1-b (2 (open)) and a state in which the shape of the barrier 2 enables the most efficient retraction, that is, a state in which the lens barrel diameter can be reduced (2 (closed)). To do. Then, the optical axis center 2- when the barrier 2 is closed
Draw a circle centered on c and having an arbitrary radius (R). Further, even when the barrier 2 is opened, a circle having a radius (R) is drawn from the same position. Then, the intersection X-1 or X-2 is set as the position of the fitting pin 2-b. This position (X-1, X-2)
If there is a fitting pin 2-b in the, the barrier 2 retracts when the barrier rotating ring 3 rotates, and it becomes possible to retract to the position with the most space efficiency. At that time, barrier 2
Guide the sliding pin 2-a into the long hole 1-c so that it will not rotate. At this time, the slot 1-c does not have to be a straight line.

【0021】図4に以上の機構を用いてバリア開き動作
を行った場合のバリア2の移動軌跡を示す。
FIG. 4 shows the locus of movement of the barrier 2 when the barrier opening operation is performed using the above mechanism.

【0022】<実施例2>図5〜図7に第二の実施例を
示す。図5〜図7において図1〜図4と同じ符号で表示
されている構成要素は同じ名称の部品である。
<Second Embodiment> FIGS. 5 to 7 show a second embodiment. 5 to 7, the components indicated by the same reference numerals as those in FIGS. 1 to 4 are parts having the same names.

【0023】図5を参照してバリア2が閉じたときと開
いたときの位置関係を見ると、スライドしていると同等
の位置関係にあることがわかる。図5において第一実施
例と同様の作図を行うと、交点X−1は左右対称の位置
に描かれる。左右対称の場合は同形状とみなせるので、
交点は一箇所であり、そこが嵌合ピン2−bの位置にな
る。図7にこの形状の場合のバリア2の移動軌跡を示
す。前面化粧板の長穴1−cを簡単のため直線としてい
るが、本実施例の場合、バリア2は直線的にスライドす
るのではなく、うねりながら移動してゆくことがわか
る。
Looking at the positional relationship when the barrier 2 is closed and when it is opened with reference to FIG. 5, it can be seen that the positional relationship is equivalent to that when the barrier 2 is sliding. When the same drawing as in the first embodiment is performed in FIG. 5, the intersection point X-1 is drawn at a symmetrical position. If it is symmetrical, it can be regarded as the same shape,
There is one intersection, which is the position of the fitting pin 2-b. FIG. 7 shows the movement trajectory of the barrier 2 in the case of this shape. Although the long hole 1-c of the front decorative plate is made straight for simplification, it can be seen that in the case of this embodiment, the barrier 2 is not linearly slid but is moved in a wavy manner.

【0024】[0024]

【発明の効果】以上に説明したように、本発明のバリア
開閉機構によれば、(1)採光穴形状に対して任意にバ
リア形状、及び、退避位置を決定することが可能、
(2)採光穴の大きさに対して、スペース効率良くバリ
アを収納し、鏡筒直径を小さくすることが可能、(3)
スライド式バリア機構と同様のバリア退避状態でありな
がら、リンク機構などを使用せずに少ない部品点数でバ
リア開閉を行うことが可能、等の効果がある。
As described above, according to the barrier opening / closing mechanism of the present invention, (1) it is possible to arbitrarily determine the barrier shape and the retracted position with respect to the shape of the lighting hole.
(2) It is possible to store the barrier space-efficiently and reduce the diameter of the lens barrel with respect to the size of the lighting hole. (3)
Although the barrier is in the same retracted state as the slide type barrier mechanism, it is possible to open and close the barrier with a small number of parts without using a link mechanism or the like.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第一実施例のバリア開閉機構における
設計方法を説明するための図。
FIG. 1 is a diagram for explaining a design method for a barrier opening / closing mechanism according to a first embodiment of the present invention.

【図2】第一実施例のバリア開閉機構の主要三部品の正
面図。
FIG. 2 is a front view of three main components of the barrier opening / closing mechanism of the first embodiment.

【図3】本発明のバリア開閉機構を装備したカメラのレ
ンズ鏡筒部の要部縦断面図。
FIG. 3 is a vertical cross-sectional view of a main part of a lens barrel of a camera equipped with the barrier opening / closing mechanism of the present invention.

【図4】第一実施例のバリアの移動軌跡を示した図。FIG. 4 is a diagram showing a movement path of the barrier according to the first embodiment.

【図5】本発明の第二実施例のバリア開閉機構における
設計方法を説明するための図。
FIG. 5 is a diagram for explaining a design method for the barrier opening / closing mechanism according to the second embodiment of the present invention.

【図6】第二実施例のバリア開閉機構の主要三部品の正
面図。
FIG. 6 is a front view of three main components of the barrier opening / closing mechanism of the second embodiment.

【図7】第二実施例のバリアの移動軌跡を示した図。FIG. 7 is a diagram showing a moving path of the barrier of the second embodiment.

【図8】(a)は従来のバリア開閉機構の閉じた状態の
正面図、(b)は該バリア開閉機構の閉じた状態の斜視
図、(c)は該バリア開閉機構を装備しているズームカ
メラの沈胴状態での縦断面図。
8A is a front view of a conventional barrier opening / closing mechanism in a closed state, FIG. 8B is a perspective view of the barrier opening / closing mechanism in a closed state, and FIG. 8C is equipped with the barrier opening / closing mechanism. FIG. 3 is a vertical sectional view of the zoom camera in a retracted state.

【図9】(a)は図8のバリア開閉機構の開放状態の正
面図、(b)は該バリア開閉機構の開放状態での斜視
図、(c)は該カメラの鏡筒部が突出したワイド状態で
の縦断面図。
9A is a front view of the barrier opening / closing mechanism of FIG. 8 in an open state, FIG. 9B is a perspective view of the barrier opening / closing mechanism in an open state, and FIG. 9C is a lens barrel portion of the camera protruding. A vertical cross-sectional view in a wide state.

【図10】従来のバリア開閉機構の設計方法の一例を示
す図。
FIG. 10 is a diagram showing an example of a conventional method for designing a barrier opening / closing mechanism.

【図11】従来のバリア開閉機構の設計方法の他の例を
示す図。
FIG. 11 is a diagram showing another example of a conventional method for designing a barrier opening / closing mechanism.

【符号の説明】[Explanation of symbols]

1…鏡筒 1−a…前面化粧
板 1−b…採光窓 1−c…長穴 2…バリア 2−a…摺動ピン 2−b…嵌合ピン 3…バリア開閉リ
ング 101…第1のレンズ群 102…第1のレ
ンズ枠 103…合焦用繰り出し機能及びシャッタ機構 104…シャッタ羽根 105…鏡筒 106…バリア開閉リング 107…バリア 108…第2のレンズ群 109…第2のレ
ンズ枠 110…固定筒 111…カム筒 112…カメラ本体 113…駆動モー
タ 114…引っ張りバネ 115…固定カム
1 ... Lens barrel 1-a ... Front decorative plate 1-b ... Daylighting window 1-c ... Oblong hole 2 ... Barrier 2-a ... Sliding pin 2-b ... Fitting pin 3 ... Barrier opening / closing ring 101 ... First Lens group 102 ... First lens frame 103 ... Focusing extension function and shutter mechanism 104 ... Shutter blade 105 ... Lens barrel 106 ... Barrier opening / closing ring 107 ... Barrier 108 ... Second lens group 109 ... Second lens frame 110 ... Fixed cylinder 111 ... Cam cylinder 112 ... Camera body 113 ... Drive motor 114 ... Extension spring 115 ... Fixed cam plate

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 撮影光路の光軸と一致する中心を有した
採光穴が貫設されるとともに裏面にはバリアの一部を光
軸と直交する方向に誘導するガイド部が形成されていて
カメラのレンズ鏡筒の前面に固定配置されている前面化
粧板と、該採光穴を遮蔽する第一位置と該採光穴から完
全に退避する第二位置との間を移動する少なくとも2枚
のバリアと、該バリアの各々の一点を回動可能に枢支す
る枢支部を有するとともに光軸を中心として回動される
バリア駆動リングと、を有し、該バリアには該前面化粧
板の該ガイド部に相対摺動可能に係合する被誘導部と、
該バリア駆動リングの該枢支部に枢支される被枢支部と
が設けられている構造のバリア開閉機構であって、 該採光穴を該バリアが閉じている状態の図において該バ
リア上で光軸と交わる特定点を中心として所定半径で描
いた第一の円と、該バリアが該採光穴から該第二位置へ
退避した状態の図において該バリア上の該特定点を中心
として該所定半径で描いた第二の円とが交わる点を該バ
リア駆動リング上の該枢支部として決定し、該駆動リン
グが光軸を中心として回転される時の該枢支部の移動軌
跡に従って該第二位置及び該バリアの移動軌跡が決定さ
れていることを特徴とするバリア開閉機構。
1. A camera having a daylighting hole having a center coinciding with the optical axis of a photographing optical path and a guide part for guiding a part of the barrier in a direction orthogonal to the optical axis formed on a back surface of the camera. Front decorative plate fixedly arranged on the front surface of the lens barrel, and at least two barriers that move between a first position that shields the lighting hole and a second position that completely retracts from the lighting hole. A barrier drive ring that pivotally supports one point of each of the barriers and that rotates about an optical axis. The barrier includes the guide portion of the front decorative plate. A guided part that is relatively slidably engaged with
1. A barrier opening / closing mechanism having a structure in which a pivotally supported portion pivotally supported by the pivotal support portion of the barrier drive ring is provided, and the barrier is closed on the barrier in a drawing in which the barrier is closed. A first circle drawn with a predetermined radius centered on a specific point intersecting the axis, and the predetermined radius centered on the specific point on the barrier in a state where the barrier is retracted from the lighting hole to the second position. The intersection point with the second circle drawn by is determined as the pivot on the barrier drive ring, and the second position is determined according to the movement trajectory of the pivot when the drive ring is rotated about the optical axis. And a barrier opening / closing mechanism, in which a movement trajectory of the barrier is determined.
【請求項2】 該ガイド部が鉛直方向に延在するもので
あることを特徴とする請求項1のバリア開閉機構。
2. The barrier opening / closing mechanism according to claim 1, wherein the guide portion extends in the vertical direction.
【請求項3】 該ガイド部が溝もしくは長穴でるもので
あることを特徴とする請求項1のバリア開閉機構。
3. The barrier opening / closing mechanism according to claim 1, wherein the guide portion is a groove or an elongated hole.
JP33365793A 1993-12-27 1993-12-27 Barrier opening/closing mechanism Pending JPH07191380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33365793A JPH07191380A (en) 1993-12-27 1993-12-27 Barrier opening/closing mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33365793A JPH07191380A (en) 1993-12-27 1993-12-27 Barrier opening/closing mechanism

Publications (1)

Publication Number Publication Date
JPH07191380A true JPH07191380A (en) 1995-07-28

Family

ID=18268513

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33365793A Pending JPH07191380A (en) 1993-12-27 1993-12-27 Barrier opening/closing mechanism

Country Status (1)

Country Link
JP (1) JPH07191380A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003084333A (en) * 2001-09-07 2003-03-19 Canon Inc Camera
US7955007B2 (en) 2008-04-24 2011-06-07 Canon Kabushiki Kaisha Lens barrel with barrier device
EP3249903A1 (en) * 2016-05-25 2017-11-29 Cal-Comp Electronics & Communications Company Limited Lens module

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003084333A (en) * 2001-09-07 2003-03-19 Canon Inc Camera
US7955007B2 (en) 2008-04-24 2011-06-07 Canon Kabushiki Kaisha Lens barrel with barrier device
EP3249903A1 (en) * 2016-05-25 2017-11-29 Cal-Comp Electronics & Communications Company Limited Lens module
KR20170133249A (en) * 2016-05-25 2017-12-05 칼-콤프 일렉트로닉스 앤드 커뮤니케이션즈 컴퍼니 리미티드 Lens module
US10042158B2 (en) 2016-05-25 2018-08-07 Cal-Comp Electronics & Communications Company Limited Lens module

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