JPH0368366B2 - - Google Patents
Info
- Publication number
- JPH0368366B2 JPH0368366B2 JP58102547A JP10254783A JPH0368366B2 JP H0368366 B2 JPH0368366 B2 JP H0368366B2 JP 58102547 A JP58102547 A JP 58102547A JP 10254783 A JP10254783 A JP 10254783A JP H0368366 B2 JPH0368366 B2 JP H0368366B2
- Authority
- JP
- Japan
- Prior art keywords
- mirror unit
- unit frame
- copying
- speed
- wire
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/041—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with variable magnification
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
- Optical Systems Of Projection Type Copiers (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電子写真複写機等複写機における変
倍露光装置に関し、特に、露光光学系による走査
によつて露光が行われ、走査速度が切換えられて
変倍複写が行われる複写機の変倍露光装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable magnification exposure device for a copying machine such as an electrophotographic copying machine. The present invention relates to a variable magnification exposure device for a copying machine which is switched to perform variable magnification copying.
従来の上述のような変倍露光装置を備えた複写
機は、露光光学系走査運動部材の始動位置が不変
で変倍複写を行うようなものであつた。一方、複
写機の複写速度を上げようとする要望は大であ
り、変倍複写の行われる複写機についても同様で
ある。そして、上述のような変倍露光装置を備え
た複写機の複写速度も、等倍複写のみが行われる
複写機の複写速度と同様、感光体の速度によつて
定まる。したがつて、同じ複写速度でも複写倍率
が小になる程露光光学系の走査速度は早くなる。
そのために、露光光学系の走査運動部材の始動位
置が不変である従来の変倍複写可能の複写機にお
いては、複写速度を上げると、特に縮小複写の場
合に走査の助走距離が不十分となつて、走査運動
部材の速度が安定する前に原稿の投影走査が行わ
れるようになり、したがつて先に露光が行われた
部分に流れ像が生じ易いと云つた問題がある。こ
の問題は、複写速度を上げるため及び複写機の小
型化のために、走査の助走距離を短かくする手段
を採用した場合は、一層顕著となる。
A conventional copying machine equipped with a variable magnification exposure device as described above performs variable magnification copying without changing the starting position of the scanning movement member of the exposure optical system. On the other hand, there is a strong desire to increase the copying speed of copying machines, and the same is true for copying machines that perform variable-magnification copying. The copying speed of a copying machine equipped with the variable magnification exposure device as described above is also determined by the speed of the photoreceptor, similar to the copying speed of a copying machine that only performs full-size copying. Therefore, even at the same copying speed, the scanning speed of the exposure optical system becomes faster as the copying magnification decreases.
For this reason, in conventional copying machines capable of variable magnification copying in which the starting position of the scanning movement member of the exposure optical system remains unchanged, when the copying speed is increased, the scan run-up distance becomes insufficient, especially in the case of reduction copying. Therefore, there is a problem in that the projection scanning of the document is performed before the speed of the scanning movement member becomes stable, and therefore a flow image is likely to be generated in the portion that was exposed first. This problem becomes even more pronounced when a means for shortening the scan run-up distance is adopted in order to increase the copying speed and downsize the copying machine.
そこで、上述のような従来の変倍複写可能の複
写機における問題を解消するために、縮小複写の
場合は助走距離を長くするように、複写倍率に応
じて助走距離を変えるようにした複写機の変倍露
光装置が特開昭52−67321号、同55−166666号各
公報によつて提案された。しかし、従来のそのよ
うな助走距離可変の変倍露光装置は、助走距離を
変化させるための機構および露光光学系の走査運
動部材の駆動制限機構が複雑と言う問題があつ
た。 Therefore, in order to solve the above-mentioned problems with conventional copying machines capable of variable-magnification copying, a copying machine that changes the run-up distance according to the copying magnification ratio, such as increasing the run-up distance in the case of reduced copying, has been developed. A variable magnification exposure apparatus was proposed in Japanese Unexamined Patent Publications No. 52-67321 and No. 55-166666. However, such a conventional variable magnification exposure apparatus having a variable approach distance has a problem in that the mechanism for changing the approach distance and the drive limiting mechanism for the scanning movement member of the exposure optical system are complicated.
本発明は、従来の助走距離可変の変倍露光装置
における上述の問題を解消するためになされたも
のであり、助走距離を変化させるための機構が簡
単で、露光光学系の走査運動部材の駆動制御機構
も助走距離一定のものと同様に簡単でよい複写機
の変倍露光装置の提供を目的とする。
The present invention has been made in order to solve the above-mentioned problems in the conventional variable magnification exposure apparatus with a variable approach distance. It is an object of the present invention to provide a variable magnification exposure device for a copying machine whose control mechanism is as simple as one with a constant run-up distance.
本発明は、駆動ホイールと、駆動ホイールによ
つて速度Ｖで送られるワイヤーと、ワイヤーの張
設部材並びに折返し固定ホイールと、ワイヤーに
連結されて速度Ｖで移動する第１ミラーユニツト
枠と、ワイヤーの折返し移動ホイールを支持して
速度Ｖ／２で第１ミラーユニツト枠と同方向に移
動する第２ミラーユニツト枠とから成る露光光学
系走査部の助走距離と走査速度の前記Ｖとを複写
倍率に応じて変えられる複写機の変倍露光装置に
おいて、前記走査部の駆動ホイールは複写機の固
定機枠に設け、それ以外のワイヤー張設部材、ワ
イヤー折返し固定ホイール等は複写機の固定機枠
に対して第１ミラーユニツト枠等の移動方向と同
方向に位置可変の駆動手段枠に設けて、第１ミラ
ーユニツト枠と第２ミラーユニツト枠の一方に設
けたスイツチ作動部が他方に設けたスイツチに作
用した情報により駆動ホイールの第１ミラーユニ
ツト枠等を復帰させる回転を停止させるようにし
たことを特徴とする複写機の変倍露光装置にあ
り、この構成によつて前記目的を達成する。
The present invention includes a drive wheel, a wire sent at a speed V by the drive wheel, a wire tensioning member and a folding fixed wheel, a first mirror unit frame connected to the wire and moving at a speed V, and a wire The exposure optical system consists of a second mirror unit frame that supports a turning wheel and moves in the same direction as the first mirror unit frame at a speed of V/2. In a variable magnification exposure device for a copying machine that can be changed according to the speed, the drive wheel of the scanning section is installed on the fixed frame of the copying machine, and other wire tensioning members, wire folding fixed wheels, etc. are installed on the fixed frame of the copying machine. A switch actuating section provided on one of the first mirror unit frame and the second mirror unit frame is provided on the drive means frame whose position is variable in the same direction as the moving direction of the first mirror unit frame, etc. A variable magnification exposure device for a copying machine is characterized in that the rotation of the first mirror unit frame of the drive wheel to return to its original position is stopped based on the information applied to the switch, and this configuration achieves the above object. .
以下、本発明を図示例に基いて詳細に説明す
る。
Hereinafter, the present invention will be explained in detail based on illustrated examples.
第１図は変倍複写に際して原稿面から感光体面
までの光路長が変化する露光光学系を用いた本発
明変倍露光装置の例を示す複写機の概要部分側面
図で、Ａは等倍複写を行う状態、Ｂは縮小複写を
行う状態であり、第２図は露光光学系走査駆動手
段の概要斜視図である。 FIG. 1 is a schematic partial side view of a copying machine showing an example of a variable-magnification exposure apparatus of the present invention using an exposure optical system in which the optical path length from the original surface to the photoreceptor surface changes during variable-magnification copying; B is a state in which reduction copying is performed, and FIG. 2 is a schematic perspective view of the exposure optical system scanning drive means.
図において、１は固定の原稿載置台の所定位置
に載置した原稿、２は露光ランプ、３は第１ミラ
ー、４は露光ランプ２と第１ミラー３を取付けた
第１ミラーユニツト枠、５は第２ミラー、６は第
３ミラー、７は第２ミラー５と第３ミラー６を取
付けた第２ミラーユニツト枠、８はレンズ、９は
固定ミラー、１０は表面に感光体が設けられ一定
の速度で矢印方向に回転する感光体ドラムであ
る。 In the figure, 1 is a document placed at a predetermined position on a fixed document table, 2 is an exposure lamp, 3 is a first mirror, 4 is a first mirror unit frame to which the exposure lamp 2 and first mirror 3 are attached, and 5 is a first mirror unit frame. is a second mirror, 6 is a third mirror, 7 is a second mirror unit frame to which the second mirror 5 and third mirror 6 are attached, 8 is a lens, 9 is a fixed mirror, 10 is a photoreceptor provided on the surface and is fixed. The photosensitive drum rotates in the direction of the arrow at a speed of .
第１ミラーユニツト枠４と第２ミラーユニツト
枠７は、等倍複写の場合は第１図Ａに示した助走
距離がa0の位置から、また縮小複写の場合は第１
図Ｂに示した助走距離がa1（a1＞a0）の位置から、
露光ランプ２および第１ミラー３が原稿１の投影
を完全に完了する一定の位置まで、右方に走査移
動し、次いで左方に復帰移動して元の位置に戻る
と停止する。この第１ミラーユニツト枠４と第２
ミラーユニツト枠７の第１図ＡおよびＢに示した
始動位置は、露光ランプ２が原稿載置台上の原稿
１を照射して、原稿１からの反射光が第１ミラー
３、第２ミラー５、第３ミラー６、レンズ８およ
び固定ミラー９を介して感光体ドラム１０の表面
に入射する原稿１の面から感光体ドラム１０の表
面までの光路長、すなわち、原稿載置台の載置面
から感光体ドラム１０の表面までの光路長ＵがＵ
＝（Ｍ＋１／Ｍ）ｆ＋2fの関係を満足するように
設定され、第１ミラーユニツト枠４と第２ミラー
ユニツト枠７の上記往復運動は、第１ミラーユニ
ツト枠４の速度v1がv1＝ｖ／Ｍ、第２ミラーユニ
ツト枠７の速度v2がv2＝v1／２で行われて、第１
ミラーユニツト枠４と第２ミラーユニツト枠７の
復帰移動の停止は、v1の速度の第１ミラーユニツ
ト枠４に設けたスイツチ１１がv1／２の速度の第
２ミラーユニツト枠７に設けたスイツチ作動部１
２に接触して作動されることにより行われる。こ
こで、Ｍは複写倍率、ｆはレンズ８の焦点距離、
ｖは感光体ドラム１の表面速度である。また、ス
イツチ１１が第２ミラーユニツト枠７に設けら
れ、スイツチ作動部１２が第１ミラーユニツト枠
４に設けられていてもよい。 The first mirror unit frame 4 and the second mirror unit frame 7 are moved from the position where the run-up distance shown in FIG .
From the position where the run-up distance shown in Figure B is a 1 (a 1 > a 0 ),
The exposure lamp 2 and the first mirror 3 scan to the right until a certain position where the projection of the original 1 is completely completed, then return to the left and stop when they return to their original positions. This first mirror unit frame 4 and the second
At the starting position of the mirror unit frame 7 shown in FIGS. 1A and 1B, the exposure lamp 2 illuminates the document 1 on the document table, and the reflected light from the document 1 is reflected by the first mirror 3 and the second mirror 5. , the optical path length from the surface of the original 1 that is incident on the surface of the photoreceptor drum 10 via the third mirror 6, the lens 8, and the fixed mirror 9 to the surface of the photoreceptor drum 10, that is, from the placement surface of the document placement table. The optical path length U to the surface of the photoreceptor drum 10 is U
=(M+1/M)f+2f, and the reciprocating motion of the first mirror unit frame 4 and the second mirror unit frame 7 is such that the speed v 1 of the first mirror unit frame 4 becomes v 1 = v/M, the speed v 2 of the second mirror unit frame 7 is v 2 = v 1 /2, and the first
The return movement of the mirror unit frame 4 and the second mirror unit frame 7 is stopped by a switch 11 provided in the first mirror unit frame 4 having a speed of v 1 and a switch 11 provided in the second mirror unit frame 7 having a speed of v 1 /2. Switch operating part 1
2 and is activated by contacting the Here, M is the copying magnification, f is the focal length of the lens 8,
v is the surface speed of the photosensitive drum 1. Further, the switch 11 may be provided on the second mirror unit frame 7, and the switch operating portion 12 may be provided on the first mirror unit frame 4.
なお、拡大複写においても、前記関係式が示す
ように、光路長Ｕが等倍複写時よりも長くなり、
光路長に関する限りは縮小複写の場合と類似する
ので、第１、第２ミラーユニツト枠４，７を第１
図Ｂに示すように移動させることによつて、拡大
複写も可能である。ただし、拡大複写の場合は、
レンズ８の位置が第１図Ｂの二点鎖線位置に変
る。 In addition, even in enlarged copying, as shown in the above relational expression, the optical path length U becomes longer than in full-size copying,
As far as the optical path length is concerned, it is similar to the case of reduced copying, so the first and second mirror unit frames 4 and 7 are
Enlarged copying is also possible by moving as shown in Figure B. However, in the case of enlarged copies,
The position of the lens 8 changes to the position indicated by the two-dot chain line in FIG. 1B.
以上のような第１ミラーユニツト枠４と第２ミ
ラーユニツト枠７の始動位置設定と往復運動は、
第２図に示したような走査駆動手段によつて行わ
れる。 The starting position setting and reciprocating movement of the first mirror unit frame 4 and the second mirror unit frame 7 as described above are as follows.
This is performed by a scanning driving means as shown in FIG.
第２図において、第１図と同じ符号は同じ機能
部材を示し、そして、１３は第１ミラーユニツト
枠４を取付けたワイヤー、１４，１５は駆動手段
枠に設けられたワイヤー張設部材、１６，１７は
同じく駆動手段枠に設けられた従動ホイール、１
８，１９は第２ミラーユニツト枠７と一体の軸に
回転自在に嵌装された移動ホイール、２０は駆動
ホイールであり、第２ミラーユニツト枠７と一体
の軸端は駆動手段枠に摺動可能に係合している。
ここで、駆動手段枠は、図では省略されている
が、後に説明するように、変倍切換時には移動さ
れるが、露光のための走査時には等倍複写である
と変倍複写であるとを問わず固定される。そし
て、ワイヤー１３は、駆動手段枠に設けたワイヤ
ー張設部材１４から移動ホイール１８および従動
ホイール１６をほゞ半周した後、駆動ホイール２
０の外周を少くとも１回ターンし、さらに従動ホ
イール１７および移動ホイール１９をほゞ半周し
て、他端をワイヤー張設部材１５によつて引張ら
れた形で張設されている。また駆動ホイール２０
は、従来公知の変速手段、回転方向切換手段並び
に断接クラツチを含む回転伝達手段を介して、感
光体ドラム１の回転と連動する回転を伝えられる
ものであるが、その軸が感光体ドラム１０の軸と
同様複写機の固定枠に設けた固定軸受けで支承さ
れている。それによつて回転伝達手段の構成が簡
単となる。軸が固定軸受けで支承されている場合
は、駆動ホイール２０の前後のワイヤー１３の張
り方向ができるだけ第１ミラーユニツト枠４や第
２ミラーユニツト枠７の移動方向と平行になるよ
うにワイヤー１３を張設する。それは、ワイヤー
張設部材１４，１５や従動ホイール１６，１７等
を設けた駆動手段枠を原稿載置台の載置面と平行
に移動させて、第１ミラーユニツト枠４および第
２ミラーユニツト枠７を第１図ＡまたはＢの始動
位置にもたらす際に、駆動手段枠の移動によつて
ワイヤー１３が弛んだり過大張力になつたりする
ことのないようにするためである。 In FIG. 2, the same reference numerals as in FIG. 1 indicate the same functional members, and 13 is a wire to which the first mirror unit frame 4 is attached, 14 and 15 are wire tensioning members provided on the driving means frame, and 16 , 17 is a driven wheel also provided on the drive means frame, 1
Reference numerals 8 and 19 denote moving wheels rotatably fitted on a shaft integral with the second mirror unit frame 7, and 20 is a drive wheel, the shaft end of which is integral with the second mirror unit frame 7 slides on the drive means frame. Possibly engaged.
Here, although the driving means frame is omitted in the figure, as will be explained later, it is moved when changing the magnification, but when scanning for exposure, it can be used to determine whether it is a full-size copy or a variable-magnification copy. Fixed regardless. Then, the wire 13 goes around the movable wheel 18 and the driven wheel 16 by approximately half a turn from the wire tensioning member 14 provided on the drive means frame, and then connects to the drive wheel 2.
The wire is stretched around the outer periphery of the wire at least once, and also around the driven wheel 17 and the moving wheel 19 for about half a turn, with the other end being stretched by a wire tensioning member 15. Also, the drive wheel 20
The rotation is transmitted in conjunction with the rotation of the photoreceptor drum 1 through a rotation transmission means including a conventionally known speed change means, rotational direction switching means, and an on/off clutch. Like the shaft, it is supported by a fixed bearing installed in the fixed frame of the copying machine. This simplifies the construction of the rotation transmission means. If the shaft is supported by a fixed bearing, the wires 13 should be stretched so that the tension direction of the wires 13 at the front and rear of the drive wheel 20 is as parallel as possible to the moving direction of the first mirror unit frame 4 and the second mirror unit frame 7. Stretch it. That is, by moving the driving means frame provided with wire tensioning members 14, 15, driven wheels 16, 17, etc. in parallel to the placing surface of the document placing table, the first mirror unit frame 4 and the second mirror unit frame 7 are moved. This is to prevent the wire 13 from becoming loose or under excessive tension due to movement of the drive means frame when the wire 13 is brought to the starting position shown in FIG. 1A or B.
複写倍率Ｍを変える場合に、第１ミラーユニツ
ト枠４および第２ミラーユニツト枠７を第１図Ａ
またはＢに示した始動位置にもたらすのは、上述
のように駆動手段枠を動かすことによつて簡単に
行うことができる。すなわち、図示例のように、
光路長Ｕを変えて複写倍率Ｍを変える露光光学系
を用いた複写機にあつては、前記Ｕ＝（Ｍ＋１／
Ｍ）ｆ＋2fの関係から、Ｍ＝１の等倍複写の場合
が光路長Ｕが最短であり、縮小または拡大複写の
場合は光路長Ｕを伸ばすことになるので、特に第
１ミラーユニツト枠４の速度v1がｖ／Ｍで高速に
切換えられる縮小複写の場合に、投影走査時の速
度が安定するように、助走距離をa0からそれより
も長いa1に始動位置変更するのは、先に述べたよ
うに、駆動手段枠を複写倍率Ｍに応じた所定の位
置に移動して設定することによりなされる。な
お、複写倍率Ｍを変える場合は、レンズ８の位置
も第１図Ａ、Ｂに示した位置に変えることになる
が、それは複写機のフレームに対して移動設定し
ても、駆動手段枠に対して移動設定してもよい。 When changing the copying magnification M, the first mirror unit frame 4 and the second mirror unit frame 7 are
Alternatively, the starting position shown in B can be simply achieved by moving the drive means frame as described above. That is, as in the illustrated example,
For a copying machine using an exposure optical system that changes the copying magnification M by changing the optical path length U, the above U=(M+1/
M) From the relationship f + 2f, the optical path length U is the shortest in the case of equal-size copying where M = 1, and in the case of reduced or enlarged copying, the optical path length U will be extended, so especially the first mirror unit frame 4 In the case of reduced copying in which the speed v 1 is changed rapidly by v/M, it is necessary to first change the starting position from a 0 to a 1 , which is longer than the run-up distance, so that the speed during projection scanning is stable. As described above, this is done by moving and setting the drive means frame to a predetermined position corresponding to the copying magnification M. In addition, when changing the copying magnification M, the position of the lens 8 must also be changed to the position shown in FIG. You may also set it to move.
複写倍率Ｍを変える場合は、以上述べたよう
に、始動位置を第１図ＡまたはＢに示した位置に
設定すると共に、駆動ホイール２０への図示して
ない回転伝達手段の変速手段を駆動ホイール２０
の外周速度がｖ／Ｍとなるように切換える。そこ
で、複写を開始すると、回転伝達手段の断接クラ
ツチが接続され、駆動ホイール２０が矢印方向に
回転して、第１ミラーユニツト枠４を速度v1＝
ｖ／Ｍで、第２ミラーユニツト枠７を速度v1／２
で走査移動させ、第１ミラーユニツト枠４または
第２ミラーユニツト枠７が所定の位置に達する
と、回転伝達手段の回転方向切換手段が切換えら
れて、駆動ホイール２０が逆転し、それによつて
第１ミラーユニツト枠４と第２ミラーユニツト枠
７は逆方向に復帰移動するようになる。なお、回
転方向切換手段は駆動ホイール２０の逆転速度を
増速して切換えるものであつてもよい。第１ミラ
ーユニツト枠４と第２ミラーユニツト枠７がそれ
ぞれ速度v1とv1／２で復帰移動して始動位置に戻
り、その際、スイツチ作動部１２がスイツチ１１
を作動することによつて回転伝達手段の断接クラ
ツチが断たれ、また必要に応じて断接クラツチの
駆動ホイール２０側にブレーキが作用することに
より、第１ミラーユニツト枠４と第２ミラーユニ
ツト枠７の停止が行われる。 When changing the copying magnification M, as described above, the starting position is set to the position shown in FIG. 20
Switching is performed so that the outer circumferential speed of is set to v/M. When copying is started, the clutch of the rotation transmitting means is connected, and the drive wheel 20 rotates in the direction of the arrow to move the first mirror unit frame 4 at a speed v 1 =
v/M, the speed of the second mirror unit frame 7 is v 1 /2
When the first mirror unit frame 4 or the second mirror unit frame 7 reaches a predetermined position, the rotation direction switching means of the rotation transmission means is switched and the drive wheel 20 is reversely rotated. The first mirror unit frame 4 and the second mirror unit frame 7 return to opposite directions. Note that the rotation direction switching means may increase the reverse rotation speed of the drive wheel 20 and switch the rotation direction. The first mirror unit frame 4 and the second mirror unit frame 7 return to the starting position at speeds v 1 and v 1 /2, respectively, and at that time, the switch operating section 12 operates the switch 11.
By operating the disengagement clutch of the rotation transmission means, the brake is applied to the drive wheel 20 side of the disengagement clutch as necessary, thereby causing the first mirror unit frame 4 and the second mirror unit to be separated. Frame 7 is stopped.
以上述べたように、本発明の変倍露光装置にお
いては、変倍複写に際して駆動手段枠の位置を移
動させると言う簡単な機構で露光光学系の走査の
助走距離が変えられるから、走査速度が早くなる
縮小複写においても助走距離不変の装置における
と同様の簡単な駆動制御機構により安定した速度
で露光走査が行われて、常にムラのない複写を行
うことができると云う優れた効果が得られる。
As described above, in the variable magnification exposure apparatus of the present invention, the approach distance of scanning of the exposure optical system can be changed by a simple mechanism of moving the position of the drive means frame during variable magnification copying, so the scanning speed can be increased. Even in the case of faster reduction copying, exposure scanning is performed at a stable speed using a simple drive control mechanism similar to that used in devices with an unchanging run-up distance, resulting in the excellent effect of always being able to make uniform copies. .
第１図は変倍複写に際して原稿面から感光体面
までの光路長が変化する露光光学系を用いた本発
明変倍露光装置の例を示す複写機の概要部分側面
図で、Ａは等倍複写を行う状態、Ｂは縮小複写を
行う状態であり、第２図は露光光学系走査駆動手
段の概要斜視図である。
１……原稿、２……露光ランプ、３……第１ミ
ラー、４……第１ミラーユニツト枠、５，６……
第２、第３ミラー、７……第２ミラーユニツト
枠、８……レンズ、９……固定ミラー、１０……
感光体ドラム、１１……スイツチ、１２……スイ
ツチ作動部、１３……ワイヤー、１４，１５……
ワイヤー張設部材、１６，１７……従動ホイー
ル、１８，１９……移動ホイール、２０……駆動
ホイール、a0，a1……助走距離。
FIG. 1 is a schematic partial side view of a copying machine showing an example of a variable-magnification exposure apparatus of the present invention using an exposure optical system in which the optical path length from the original surface to the photoreceptor surface changes during variable-magnification copying; B is a state in which reduction copying is performed, and FIG. 2 is a schematic perspective view of the exposure optical system scanning drive means. 1... Original, 2... Exposure lamp, 3... First mirror, 4... First mirror unit frame, 5, 6...
Second and third mirrors, 7... Second mirror unit frame, 8... Lens, 9... Fixed mirror, 10...
Photosensitive drum, 11... switch, 12... switch operating section, 13... wire, 14, 15...
Wire tensioning member, 16, 17...driven wheel, 18, 19... moving wheel, 20... drive wheel, a0 , a1 ...approach distance.
Claims (1)
Ｖで送られるワイヤーと、ワイヤーの張設部材並
びに折返し固定ホイールと、ワイヤーに連結され
て速度Ｖで移動する第１ミラーユニツト枠と、ワ
イヤーの折返し移動ホイールを支持して速度Ｖ／
２で第１ミラーユニツト枠と同方向に移動する第
２ミラーユニツト枠とから成る露光光学系走査部
の助走距離と走査速度の前記Ｖとを複写倍率に応
じて変えられる複写機の変倍露光装置において、
前記走査部の駆動ホイールは複写機の固定機枠に
設け、それ以外のワイヤー張設部材、ワイヤー折
返し固定ホイール等は複写機の固定機枠に対して
第１ミラーユニツト枠等の移動方向と同方向に位
置可変の駆動手段枠に設けて、第１ミラーユニツ
ト枠と第２ミラーユニツト枠の一方に設けたスイ
ツチ作動部が他方に設けたスイツチに作用した情
報により駆動ホイールの第１ミラーユニツト枠等
を復帰させる回転を停止させるようにしたことを
特徴とする複写機の変倍露光装置。1. A drive wheel, a wire sent at a speed V by the drive wheel, a wire tensioning member and a turning fixed wheel, a first mirror unit frame connected to the wire and moving at a speed V, and a turning movement of the wire. Speed V/ by supporting the wheel
2, an exposure optical system consisting of a first mirror unit frame and a second mirror unit frame that moves in the same direction; variable magnification exposure of a copying machine in which the approach distance of the scanning section and the scanning speed V can be changed according to the copying magnification; In the device,
The drive wheel of the scanning unit is installed on the fixed frame of the copying machine, and the other wire tensioning members, wire folding fixed wheels, etc. are arranged in the same direction as the moving direction of the first mirror unit frame, etc. with respect to the fixed frame of the copying machine. A switch actuating section provided in one of the first mirror unit frame and the second mirror unit frame operates the first mirror unit frame of the drive wheel by the information acting on the switch provided in the other. 1. A variable magnification exposure device for a copying machine, characterized in that the rotation for restoring the rotation of the photocopier is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10254783A JPS59228237A (en) | 1983-06-10 | 1983-06-10 | Variable magnification exposure device of copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10254783A JPS59228237A (en) | 1983-06-10 | 1983-06-10 | Variable magnification exposure device of copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59228237A JPS59228237A (en) | 1984-12-21 |
| JPH0368366B2 true JPH0368366B2 (en) | 1991-10-28 |
Family
ID=14330270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10254783A Granted JPS59228237A (en) | 1983-06-10 | 1983-06-10 | Variable magnification exposure device of copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59228237A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3410190B2 (en) * | 1993-12-29 | 2003-05-26 | 株式会社東芝 | Image forming apparatus and document reading method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5267321A (en) * | 1975-12-01 | 1977-06-03 | Canon Inc | Variable magnification optical instrument |
| JPS55166666A (en) * | 1979-06-15 | 1980-12-25 | Canon Inc | Variable power copying apparatus |
-
1983
- 1983-06-10 JP JP10254783A patent/JPS59228237A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59228237A (en) | 1984-12-21 |
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