JPS60205531A - Light shielding device of variable magnification copying machine - Google Patents

Light shielding device of variable magnification copying machine

Info

Publication number
JPS60205531A
JPS60205531A JP6461284A JP6461284A JPS60205531A JP S60205531 A JPS60205531 A JP S60205531A JP 6461284 A JP6461284 A JP 6461284A JP 6461284 A JP6461284 A JP 6461284A JP S60205531 A JPS60205531 A JP S60205531A
Authority
JP
Japan
Prior art keywords
lens
light
fixed
light shield
curtain
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
JP6461284A
Other languages
Japanese (ja)
Inventor
Haruhiro Hyodo
兵藤 晴洋
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP6461284A priority Critical patent/JPS60205531A/en
Publication of JPS60205531A publication Critical patent/JPS60205531A/en
Pending legal-status Critical Current

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  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)

Abstract

PURPOSE:To shield a lens from light securely through simple constitution by providing a fixed light shield plate and a flexible light shield curtain which is fixed to a lens holding member at one terminal and also fixed to a fixing member at the other terminal. CONSTITUTION:A figure shows the motion of the light shield device accompanying the movement of a lens and curvature of a light shielding curtain increases gradually as the lens 20 moves from an unmagnification position to an enlargement position. When the lens moves to a reduction position, on the other hand, the curvature approximates to a straight line gradually. Therefore, harmful light is cut off securely without requiring large space and energizing force is applied from the light shield curtain 44 to the lens 20 nearly in a constant direction, so no lens blurr is caused. The light shield curtain 44 is held by the fixing member 45. In this case, a light shield curtain which is fixed to the fixing member at one terminal is usable as a substitute for the moving light shield plate 43 which moves according to the movement of the lens 20.

Description

【発明の詳細な説明】 技術分野 本発明は変倍時にレンズ位置が光軸方向と光軸と直角方
向の両方に移動する変倍複写機における遮光装置に関す
る。
TECHNICAL FIELD The present invention relates to a light shielding device for a variable magnification copying machine in which the lens position moves both in the direction of the optical axis and in the direction perpendicular to the optical axis during variable magnification.

従来技術 一般に、コーナーレジストレーションを行なう変倍複写
機は、第1図に示すように複写倍率に応じてレンズ(6
)の位置を適宜変更した後、原稿載置板(1)上の原稿
を照明ランプC)によって黒射し、得られた反射光をミ
ラー(3)、 、(4)、 (5)を介してレンズ・(
6)を通過させた後、ミラー(7)を介して感光体(8
)上へ結像させて原稿像を得ている。その際複写倍率の
変更に伴って共役距離が変化するため、それを補正する
必要があり、補正手段としてミラー(7)の位置が適宜
変更されるようになっている。
PRIOR ART In general, a variable magnification copying machine that performs corner registration uses a lens (6
), the document on the document placement plate (1) is illuminated by illumination lamp C), and the reflected light is reflected through mirrors (3), , (4), and (5). The lens (
6), the photoreceptor (8) is passed through the mirror (7).
) The original image is obtained by focusing the image upward. At this time, since the conjugate distance changes as the copying magnification changes, it is necessary to correct it, and the position of the mirror (7) as a correction means is changed as appropriate.

第2図は前記複写機におけるレンズ移動とそれに伴う原
稿像の光路変化を示したもので、(A)、 (B)はそ
れぞれ原稿載置板(1)の最側端部、(A)′、 (g
5+;tソれぞれ感光体(8)の最側端部を表わしてい
る。このものにおいては、レンズ(6)を光軸方向に移
動させることにより、原稿像を拡大もしくは縮少して感
光体(8)上へ結像させるのだが、その移動と共に、レ
ンズ(6)を光軸に対して直角方向へ移動させることに
より、複写倍率が変化しても原稿を載置板(1)の端部
(A)に合わせるだけで常に感光体(8)の端部間に結
像させることができる。
FIG. 2 shows the lens movement in the copying machine and the accompanying change in the optical path of the original image. (A) and (B) are the outermost end of the original plate (1), , (g
5+;t each represents the outermost end of the photoreceptor (8). In this device, by moving the lens (6) in the optical axis direction, the original image is enlarged or reduced and formed on the photoreceptor (8). By moving the document in a direction perpendicular to the axis, even if the copying magnification changes, the image will always be formed between the edges of the photoreceptor (8) by simply aligning the original with the edge (A) of the placement plate (1). can be done.

しかしながら、原稿から得られた反射光はあらゆる方向
へ照射されており、その一部がレンズ(6)を通過する
ことなく直接感光体(8)上へ到達した場合には、複写
物に先駆ムラや画質低下等の悪影響を及ぼすことになる
っ 従来は、これを防止するものとして、複写機本体側へ固
定遮光板(9)、 ($0)を設けると共に、レンズ(
6)へレンズ(6)と共に移動する移動遮光板(11)
However, the reflected light obtained from the original is irradiated in all directions, and if a part of the reflected light reaches the photoreceptor (8) directly without passing through the lens (6), there may be some unevenness on the copy. Conventionally, in order to prevent this, a fixed light shielding plate (9), ($0) was provided on the copying machine body side, and a lens (
6) A movable light shielding plate (11) that moves together with the lens (6)
.

(12)を設けたものがある。しかし、コーナーレジス
トレーションを行なう変倍複写機は、前述したように斜
め方向へレンズ(6)が移動することから、固定遮光板
(9)、 (1o)で遮光できる範囲が狭く、その結果
移動遮光板(11)、 (12)を非常に大きくする必
要かある。このため、広いスペースを必要とするばかり
でなく、レンズ(6)の駆動装置等を移動遮光板(11
)、 (12)の移動範囲外に配置しなければならず、
機械構成工種々の不都合を招来していた。
(12) is provided. However, in variable magnification copying machines that perform corner registration, as the lens (6) moves diagonally as described above, the range that can be blocked by the fixed light shielding plates (9) and (1o) is narrow, and as a result, the lens (6) moves diagonally. Is it necessary to make the light shielding plates (11) and (12) very large? For this reason, not only a large space is required, but also the driving device of the lens (6), etc. must be moved to the light shielding plate (11).
), must be placed outside the movement range of (12),
This caused various inconveniences for mechanical engineers.

目 的 本発明は以上のような不都合に鑑みてなされたもので、
その目的は、広いスペースを必要とすることなく、簡単
な構成でもって確実に遮光できる低コストの遮光装置を
提供することにある。
Purpose The present invention was made in view of the above-mentioned disadvantages.
The purpose is to provide a low-cost light blocking device that can reliably block light with a simple configuration without requiring a large space.

要 旨 上記した目的を達成するため、本発明に係わる遮光装置
は、変倍時にレンズが光軸方向と光軸に対して(直、角
方向の両方向へ移動する変倍複写機において、原稿像の
光路外に固定して設けられた遮光板と、湾曲した状態で
一端をレンズ保持部材・・に固定されると共に他端を原
稿像の光路外の固定部材に固定された可撓性を有する遮
光幕とを備えたものである。
Summary In order to achieve the above-mentioned object, a light shielding device according to the present invention is used in a variable magnification copying machine in which a lens moves both in the optical axis direction and in the angular direction (directly and angularly) with respect to the optical axis when changing magnification. It has a light shielding plate that is fixedly provided outside the optical path of the original image, and a flexible one end that is fixed to a lens holding member in a curved state and the other end that is fixed to a fixed member that is outside the optical path of the original image. It is equipped with a light-shielding curtain.

実施例 以下、図面を参照して本発明の詳細な説明する。Example Hereinafter, the present invention will be described in detail with reference to the drawings.

第3図及び第4図は本発明を適用したコーナーレジスト
レーションを行なう変倍複写機の倍率変更機構を示すも
ので、このものでは拡大から縮少まで無段階の倍率が選
択でき、その倍率変更は図示しない1つのステップモー
タによって行なわれる。
Figures 3 and 4 show the magnification changing mechanism of a variable magnification copying machine that performs corner registration to which the present invention is applied.In this machine, stepless magnification can be selected from enlargement to reduction, and the magnification can be changed. is performed by one step motor (not shown).

前記したモータの出力軸は駆動ギア(13)と連結され
ており、駆動ギア(13)には中間ギア(14)が噛合
している。中間ギア(14)は、その下面にレンズ移動
機構を駆動させるための駆動ブーIJ(21)が同軸に
固定されていると共に、ミラー移動機構を駆動させるた
めのギア(31)と噛合している。
The output shaft of the motor described above is connected to a drive gear (13), and an intermediate gear (14) meshes with the drive gear (13). The intermediate gear (14) has a driving boo IJ (21) coaxially fixed to its lower surface for driving the lens moving mechanism, and meshes with a gear (31) for driving the mirror moving mechanism. .

駆動プーリ(21)にはプーリ(22)、 (23)に
よって張設されたワイヤー(24)が巻回され、ワイヤ
ー(24)の端部はカム(28)及びレール(25)上
に移動可能に取付けられたガイド板(26)に固定され
ている。従ってガイド板(26)は駆動ギア(13)の
回転駆動に伴い、レール(25)に、沿って適宜移動す
ることとなる。
A wire (24) stretched by pulleys (22) and (23) is wound around the drive pulley (21), and the end of the wire (24) is movable on the cam (28) and rail (25). It is fixed to a guide plate (26) attached to. Therefore, the guide plate (26) moves appropriately along the rail (25) as the drive gear (13) rotates.

また、ガイド板(26)上にはレンズ(20)を保持し
たレンズホルダー(27)が配置されている。このホル
゛グー(27)は、その裏面に設けられた長ピン(27
a)と短ピン(27b)をガイド板(26)の長大(2
6a)と溝(26b)にそれぞれ係合させることにより
、レール(25)に対して直角方向へ移動可能とされ、
さらに、図示しないスプリングによって常時長ピン(2
7a)の先端かカム(28)と摺接するように付勢され
ている。従って、レンズホルダー(27)はガイド板(
26)のレール方向への移U1と連動してレール方向と
直角となる方向にも移動するため、カム(28)の形状
に基ついて、複写倍率に応じ適宜位置決めされる □こ
ととなる。
Further, a lens holder (27) holding a lens (20) is arranged on the guide plate (26). This hole goo (27) has a long pin (27) provided on its back side.
a) and the short pin (27b) on the guide plate (26).
6a) and the groove (26b), it is possible to move in a direction perpendicular to the rail (25),
Furthermore, a spring (not shown) is used to keep the long pin (2
The tip of 7a) is biased so as to come into sliding contact with the cam (28). Therefore, the lens holder (27) is attached to the guide plate (
Since the cam (26) moves in the direction perpendicular to the rail direction in conjunction with the movement U1 of the cam (26) in the rail direction, it is appropriately positioned according to the copying magnification based on the shape of the cam (28).

一方、ギア(31)上面には偏心カム(32)が同軸に
固定され、ミラーホルダー(33)にはカム7オロア(
34)が固定されている。ミラーホルダー(36)は、
図示しないガイドレールを介して図中矢印方向へ移動可
能とされていると共に、図示しないスプリングによって
常時カム7オロア(34)のカーラ(34a)が偏心カ
ム(32)と摺接するように付勢されている。
On the other hand, an eccentric cam (32) is coaxially fixed on the upper surface of the gear (31), and a cam 7 orer (
34) is fixed. The mirror holder (36) is
It is movable in the direction of the arrow in the figure via a guide rail (not shown), and is constantly biased by a spring (not shown) so that the collar (34a) of the cam 7 lower (34) comes into sliding contact with the eccentric cam (32). ing.

従って、ミラーホルダー(33)は、偏心カム(32)
の回転に伴ってカム7オロア(34)が押されることか
ら、矢印方向へ適宜移動することとなる。また、レンズ
ホルダー(36)内には第5図に示すようにミラー(3
0)を保持する枠体(37)がその両側面に突設された
軸(38)を支点として揺動可能に設けられている。こ
の軸(38)は軸心がミラー(30)の反射面上となる
ように設けられている。また、枠体(37)はその片側
端部に揺動レバー(39)を備えており、その先端の鉤
部(39a)を複写機本体に固定された連続的なカム面
(40a )を持つカム板(40)に係合されている。
Therefore, the mirror holder (33) is attached to the eccentric cam (32).
Since the cam 7 lower (34) is pushed as the cam 7 rotates, it moves appropriately in the direction of the arrow. Additionally, a mirror (3) is provided inside the lens holder (36) as shown in FIG.
A frame body (37) for holding the frame body (37) is provided to be swingable about shafts (38) protruding from both sides of the frame body (37). This shaft (38) is provided so that its axis is on the reflective surface of the mirror (30). Further, the frame body (37) is equipped with a swing lever (39) at one end thereof, and the hook portion (39a) at the tip thereof has a continuous cam surface (40a) fixed to the main body of the copying machine. It is engaged with the cam plate (40).

従って、前記したミラーホルダー(36)の移動と連動
して鉤部(39a)がカム面(40a)上を摺動するこ
とからミラー(30)の角度も変更されるため、複写倍
率に応じて共役距離を補正できると共に、常に感光体上
の一定位置へ原稿の像を照射することができる。
Therefore, since the hook portion (39a) slides on the cam surface (40a) in conjunction with the movement of the mirror holder (36) described above, the angle of the mirror (30) is also changed, so that the angle of the mirror (30) is changed depending on the copying magnification. In addition to being able to correct the conjugate distance, it is also possible to always irradiate the original image onto a fixed position on the photoreceptor.

さらに、本実施例においては、本体側へ固定遮光板(4
1)、 (42)を固定して設けると共に、レンズ(2
0)の移動に伴って移動する移動遮光板(43)及び遮
光幕(44)をそれぞれレンズホルダー(27)の両側
面に設けている。この遮光幕(44)は可撓性部材から
なり、常に一定方向へ湾曲するようにその一端をレンズ
ホルダー(27)に固定されると共に、他端を原稿像の
光路外に位置する本体側の固定部材(45)に固定され
ている。そして、その長さはレンズホルダー(27)が
移動して固定部材’(45)から最も遠さかった場合に
略直線となる程度とされている。−第6図はこの実施例
におけるレンズ移動に伴う遮光装置の動きを示している
。遮光幕(44)は、等倍位置から拡大位置へレンズ(
20)か移動すると、徐々に湾曲を増し、逆に縮小位置
へ移動すると、徐々に直線に近ついて行く。従って、広
いスペースを必要とすることなく確実に有害光を遮断で
きると共に、遮光幕(44)からレンズ(20)に対し
て略一定方向の付勢力が加わるため、レンズぷれを生じ
ることもない。
Furthermore, in this embodiment, a fixed light shielding plate (4
1), (42) are fixedly provided, and the lens (2) is fixedly provided.
A movable light-shielding plate (43) and a light-shielding curtain (44) that move with the movement of the lens holder (27) are provided on both sides of the lens holder (27), respectively. This light-shielding curtain (44) is made of a flexible member, and one end thereof is fixed to the lens holder (27) so as to always curve in a certain direction, and the other end is fixed to the main body side located outside the optical path of the original image. It is fixed to a fixed member (45). The length is such that it becomes approximately a straight line when the lens holder (27) moves and is the farthest from the fixing member' (45). - FIG. 6 shows the movement of the light shielding device as the lens moves in this embodiment. The light shielding curtain (44) moves the lens (
20) When it moves, the curve gradually increases, and when it moves to the reduced position, it gradually approaches a straight line. Therefore, harmful light can be reliably blocked without requiring a large space, and since a biasing force is applied from the light shielding curtain (44) to the lens (20) in a substantially constant direction, lens deflection does not occur.

第7図は前記実施例において、移動遮光板(43)のか
わりに遮光幕(46)を設けたもので、他の構成は前記
実施例と同様である。この遮光幕(46)は前記した遮
光幕(44)と同様に、その一端を本体側の固定部材(
47)に固定されている。このものにおいても前記実施
例と同様にレンズ(20)の移動に伴って遮光幕(44
)、 (46)の湾曲か増減されることにより、広いス
ペースを必要とすることなく確実に有害光を遮断できる
FIG. 7 shows an embodiment in which a light-shielding curtain (46) is provided in place of the movable light-shielding plate (43) in the embodiment described above, and the other configurations are the same as in the embodiment described above. This light-shielding curtain (46), like the above-mentioned light-shielding curtain (44), has one end attached to the fixing member (
47). In this case as well, the light-shielding curtain (44)
), (46) can be increased or decreased to reliably block harmful light without requiring a large space.

効 果 以上の説明で明らかなように1本発明は、変倍時にレン
ズが光軸方向と光軸に対して直角方向の両方向へ移動す
る変倍複写機に旭いて、原稿像の光路外に固一定して設
けられた遮光板と、湾曲した、、’、’11 状態で一端をレンズ保持部材に固定されると共に他端を
原稿像の光路外の固定部材に固定された可撓性を有する
遮光幕とを備えたという極めて簡単な構成を有するもの
であり、広いスペースを必要とすることなく、しかも低
コストで確実に有害光を遮断することができる。
Effects As is clear from the above explanation, the present invention is applicable to a variable magnification copying machine in which the lens moves both in the optical axis direction and in the direction perpendicular to the optical axis when changing magnification, so that the lens does not move outside the optical path of the original image. A light-shielding plate provided in a fixed manner, and a flexible plate having one end fixed to a lens holding member in a curved state and the other end fixed to a fixing member outside the optical path of the original image. It has an extremely simple structure, including a light-shielding curtain, and can reliably block harmful light without requiring a large space and at low cost.

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

第1図はコーナーレジストレーションを行なう変倍複写
機の基本形態を示す図、第2図は従来の遮光装置を示す
図、第3図及び第4図は本発明に係わる倍率変更機構を
示すもので、第3図は斜視図、第4図は上面図、第5図
はミラー揺動機構を示す斜視図、第6図は本発明を適用
した遮光装置の第1実施例を示す図、第7図は本発明を
適用した遮光装置の第2実施例を示す図である。 (6)、 (20)・・・レンズ、(9)、 (10)
、 (41)、 (42)・・・固定遮光板、(27)
・・・レンズホルダー、(44)、 (46)・・・遮
光幕、(45)、 (47)・・・固定部材。 出願人 ミノルタカメラ株式会社 第4図 第6図 第7図
Fig. 1 shows the basic form of a variable magnification copying machine that performs corner registration, Fig. 2 shows a conventional light shielding device, and Figs. 3 and 4 show a magnification changing mechanism according to the present invention. 3 is a perspective view, FIG. 4 is a top view, FIG. 5 is a perspective view showing a mirror swinging mechanism, FIG. 6 is a diagram showing a first embodiment of a light shielding device to which the present invention is applied, and FIG. FIG. 7 is a diagram showing a second embodiment of a light shielding device to which the present invention is applied. (6), (20)...Lens, (9), (10)
, (41), (42)...Fixed light shielding plate, (27)
...Lens holder, (44), (46)...Shading curtain, (45), (47)...Fixing member. Applicant Minolta Camera Co., Ltd. Figure 4 Figure 6 Figure 7

Claims (1)

【特許請求の範囲】[Claims] 1、変倍時にレンズが光軸方向と光軸に対して直角方向
の両方向へ移動する変倍複写機において、原稿像の光路
外に固定して設けられた遮光板と、湾曲した状態で一端
をレンズ保持部材に固定されると共に他端を原稿像の光
路外の固定部材に固定された可撓性を有する遮光幕とを
備えた遮光装置。
1. In a variable magnification copying machine in which the lens moves both in the optical axis direction and in the direction perpendicular to the optical axis when changing the magnification, there is a light shielding plate fixedly provided outside the optical path of the original image, and one end in a curved state. A light-shielding device comprising: a flexible light-shielding curtain which is fixed to a lens holding member, and whose other end is fixed to a fixing member outside the optical path of an original image.
JP6461284A 1984-03-30 1984-03-30 Light shielding device of variable magnification copying machine Pending JPS60205531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6461284A JPS60205531A (en) 1984-03-30 1984-03-30 Light shielding device of variable magnification copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6461284A JPS60205531A (en) 1984-03-30 1984-03-30 Light shielding device of variable magnification copying machine

Publications (1)

Publication Number Publication Date
JPS60205531A true JPS60205531A (en) 1985-10-17

Family

ID=13263255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6461284A Pending JPS60205531A (en) 1984-03-30 1984-03-30 Light shielding device of variable magnification copying machine

Country Status (1)

Country Link
JP (1) JPS60205531A (en)

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