JPS6149652B2 - - Google Patents
Info
- Publication number
- JPS6149652B2 JPS6149652B2 JP52131494A JP13149477A JPS6149652B2 JP S6149652 B2 JPS6149652 B2 JP S6149652B2 JP 52131494 A JP52131494 A JP 52131494A JP 13149477 A JP13149477 A JP 13149477A JP S6149652 B2 JPS6149652 B2 JP S6149652B2
- Authority
- JP
- Japan
- Prior art keywords
- side edge
- copy
- original
- image
- copying
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 23
- 108091008695 photoreceptors Proteins 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 1
Landscapes
- Control Or Security For Electrophotography (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
Description
【発明の詳細な説明】
本発明は複写倍率を可変とした電子写真複写機
の光学装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical device for an electrophotographic copying machine with variable copying magnification.
従来の複写機においては、原稿と複写像とが1
対1の関係にある等倍複写が一般的であるが、複
写倍率を可変にして種々の大きさの原稿を同一の
大きさの複写紙上に複写するようにすれば、書類
の整理上便利である。 In conventional copying machines, the original and the copied image are
Normally, one-to-one copying is performed at the same size, but it is convenient for organizing documents if the copying magnification is varied so that originals of various sizes can be copied onto the same size copy paper. be.
複写倍率の変換は、原稿面からレンズまでの光
路長をa、レンズからの露光面までの光路長を
b、レンズの焦点距離をf、所望の倍率をnとし
たとき、
1/a+1/b〕1/f
b/a=n
の式を満足するa・bの位置にレンズ、ミラーを
移動させて行うものである。又スリツト露光方式
の複写機では、更に原稿の走査速度と露光速度の
比を1/nとして走査方向の倍率変換を行なわな
ければならない。 To convert the copying magnification, let the optical path length from the document surface to the lens be a, the optical path length from the lens to the exposure surface be b, the focal length of the lens be f, and the desired magnification be n, then 1/a+1/b ] This is done by moving the lens and mirror to positions a and b that satisfy the equation 1/f b/a=n. Furthermore, in a slit exposure type copying machine, magnification conversion in the scanning direction must be performed by setting the ratio of the scanning speed of the document to the exposure speed to 1/n.
以下第1〜4図に示す従来装置にいて説明す
る。 The conventional apparatus shown in FIGS. 1 to 4 will be explained below.
第1図は転写型原稿台固定スリツト露光方式複
写機の倍率変換光学系の一例を示す。複写すべき
原稿1は、原稿台ガラス2上に載置され、その下
方から第1ミラーM1で図において右方向へ走査
し、原稿反射光を第1ミラーM1の1/2の速度で
同方向へ移動する第2ミラーM2に反射し、レン
ズL、第3・4ミラーM3・M4を介して感光ド
ラム3の外周面に結像させる。 FIG. 1 shows an example of a magnification conversion optical system of a copying machine using a fixed slit exposure type copying machine. The original 1 to be copied is placed on the original platen glass 2, and the first mirror M1 scans the original from below in the right direction in the figure, and the reflected light of the original is scanned in the same direction at 1/2 the speed of the first mirror M1. The light is reflected by the second mirror M2, which moves to , and is imaged on the outer peripheral surface of the photosensitive drum 3 via the lens L and the third and fourth mirrors M3 and M4.
第1の倍率n1、例えば1/1の場合にはレンズ
L、第3・4ミラーM3・M4は夫々G・g位置
にあり、このとき
1/a1+1/b1=1/f
b1/a1=n1(=1)
即ちa1=b1=2fを満足している。また第1ミラ
ーM1の走査速度は感光ドラム3の周速の1/n1
(=1)倍である。 When the first magnification n 1 is, for example, 1/1, the lens L and the third and fourth mirrors M3 and M4 are at the G and g positions, respectively, and in this case, 1/a 1 +1/b 1 = 1/f b 1 /a 1 =n 1 (=1), that is, a 1 =b 1 =2f is satisfied. The scanning speed of the first mirror M1 is 1/n 1 of the peripheral speed of the photosensitive drum 3.
(=1) times.
次に第2の倍率n1(<n1)の場合には、上記式
を満足するためにレンズLはa2=(1+1/n2)
fでH位置へ、第3・4ミラーM3・M4は全光
路長(a2+b2)が(1+n2)(1+1/n2)fと増
加するのでh位置へ移動する。 Next, in the case of the second magnification n 1 (<n 1 ), in order to satisfy the above formula, the lens L is a 2 = (1+1/n 2 )
At f, the third and fourth mirrors M3 and M4 move to the h position because the total optical path length (a 2 +b 2 ) increases to (1+n 2 )(1+1/n 2 )f.
このとき感光ドラム3上の円周方向における結
像位置を一定に保つためにレンズLはその光軸を
含み、第1図の画面に垂直な面内で移動し、また
第3・4ミラーM3・M4は第3ミラーM3への
入射光線と第4ミラーM4からの反射光線との成
す角の二等分面内を、一体となり平行移動しなけ
ればならない。第1ミラーM1の原稿走査速度と
感光ドラム3の周速の比は1/n2とするが、感光
ドラム3の周速を変化させることは画像作成プロ
セス等の関係上好ましくないので、感光ドラム3
の周速は第1の倍率n1の場合と同一に保ち、第1
ミラーM1の原稿走査速度をn1/n2倍とするのが
一般的である。 At this time, in order to keep the image forming position on the photosensitive drum 3 constant in the circumferential direction, the lens L includes its optical axis and moves in a plane perpendicular to the screen in FIG. 1, and the third and fourth mirrors M3 - M4 must integrally move in parallel within a plane bisecting the angle formed by the incident light beam on the third mirror M3 and the reflected light beam from the fourth mirror M4. The ratio of the original scanning speed of the first mirror M1 to the circumferential speed of the photosensitive drum 3 is set to 1/n 2 , but since it is undesirable to change the circumferential speed of the photosensitive drum 3 due to the image creation process, etc., the photosensitive drum 3
The peripheral speed of is kept the same as in the case of the first magnification n 1 , and
Generally, the document scanning speed of the mirror M1 is set to n 1 /n 2 times.
第3の倍率n3の場合は、同様にレンズL、第
3・4ミラーM3・M4は夫々I・iの位置に移
動し、第1ミラーM1は感光ドラム3の周速の
n1/n3倍の速度で原稿を走査する。 In the case of the third magnification n3, the lens L and the third and fourth mirrors M3 and M4 similarly move to the positions I and i, respectively, and the first mirror M1 moves at the circumferential speed of the photosensitive drum 3.
Scan the original at 3 times the speed of n 1 /n.
第2図は第1図の光路を展開し、スリツトの長
手方向をみた図である。倍率変換複写を行う際に
は、原稿の置き方は一定で、それを種々の大きさ
の複写紙上に複写するのがよい。一方複写紙は感
光ドラムからの分離の関係上大きさに関係なく、
紙送りに際し、その進行方向と平行な一側縁を常
に一定位置に置くことが多い。その場合原稿4の
一側端4a(この一側端4aは等倍複写の際も縮
小複写の際も同一の基準位置に合わせて設置され
る)を倍率に関係なく感光ドラム3の一定位置に
結像5G〜5Iさせているので、レンズLをその
光軸方向に移動させるだけでなく光軸と直角な方
向へも移動させる必要がある。 FIG. 2 is an expanded view of the optical path in FIG. 1, looking in the longitudinal direction of the slit. When performing magnification conversion copying, it is preferable to place the original in a fixed manner and copy it onto copy sheets of various sizes. On the other hand, copy paper is separated from the photosensitive drum regardless of its size.
When paper is fed, one edge parallel to the direction of paper movement is often kept at a constant position. In that case, one side edge 4a of the original 4 (this one side edge 4a is set in alignment with the same reference position both when making a full-size copy and when making a reduced copy) is placed at a fixed position on the photosensitive drum 3 regardless of the magnification. Since the images 5G to 5I are being formed, it is necessary to move the lens L not only in the direction of its optical axis but also in a direction perpendicular to the optical axis.
いま、倍率n1から倍率n2に変換する場合に、レ
ンズLを光軸と垂直の方向にΔl12だけ移動する
と、そのときの画像端部の感光ドラム3の一定位
置からの距離S12は
S12=n1・l1
−{n2(l1+△l12)+△l12} (1)
(l1は倍率n1のときの原稿の光軸位置と基準端
部との距離である。)
となる。従つて、上記のように原稿4の一側端4
aを感光ドラム3の一定位置に結像させるには、
S12=0となるように△l12を決定すればよく、そ
の値は(1)式より
Δl12=(n1−n2)l1/(1+n2) (2)
となる。 Now, when converting from the magnification n 1 to the magnification n 2 , if the lens L is moved by Δl 12 in the direction perpendicular to the optical axis, the distance S 12 from the fixed position of the photosensitive drum 3 to the edge of the image at that time is S 12 = n 1 · l 1 − {n2 (l 1 + △l 12 ) + △l 12 } (1) (l 1 is the distance between the optical axis position of the original and the reference edge when the magnification is n 1 . ) becomes. Therefore, as mentioned above, one side edge 4 of the original 4
In order to image a at a certain position on the photosensitive drum 3,
It is sufficient to determine Δl 12 so that S 12 =0, and its value becomes Δl 12 = (n 1 - n 2 ) l 1 / (1+n 2 ) (2) from equation (1).
上記の手法より第3図a〜cに示すように、一
側端を基準にして送られる大きさの異なる複写紙
をP1〜P3に倍率変換画像5G〜5Iを複写するこ
とができる。 As shown in FIGS. 3a to 3c, using the above method, it is possible to copy magnification-converted images 5G to 5I on copy sheets P 1 to P 3 of different sizes fed from one side edge as a reference.
以上が従来の複写倍率を可変として複写機の光
学装置であり、一般にその複写倍率は原稿と複写
像とが1対1の関係にある等倍複写と、原稿より
も複写像が小さい縮小複写とができるようになつ
ているものが多い。 The above is a conventional optical device for a copying machine with a variable copying magnification. Generally, the copying magnification is divided into 1:1 copying where the original and the copied image are in a 1:1 relationship, and reduced copying where the copied image is smaller than the original. There are many things that are now possible.
ところで、複写紙の側端部を分離ベルト等で感
光ドラムから分離するタイプの複写機では、画像
の乱れや汚れを防止するために、分離ベルト等に
対応する基準側に数mm乃至10mm程度の巾で画像が
形成されない非画像形成部を設けている。そのた
め、この部分にあたる原稿の情報は複写されな
い。これは、等倍複写の場合には実用上ほとんど
問題ないが、縮小複写の場合には問題となる。即
ち第4図に示すように、非画像形成部6の巾をW
とすると、等倍複写の場合この非画像形成部6に
より複写されない原稿の巾もWであるが、縮小複
写の場合には倍率をnとすると非画像形成部6に
より複写されない原稿の巾はW/n(>W)とな
り、より広い部分が複写されないことになる。こ
れは倍率が小さくなればなるほど広い部分が複写
されないことになり、実用上無視できない。 By the way, in a type of copying machine that separates the side edge of the copy paper from the photosensitive drum using a separation belt, etc., in order to prevent the image from becoming distorted or smudged, a distance of several mm to 10 mm is placed on the reference side corresponding to the separation belt, etc. A non-image forming part is provided in which no image is formed in the width. Therefore, the document information corresponding to this part is not copied. This poses almost no practical problem in the case of full size copying, but becomes a problem in the case of reduced copying. That is, as shown in FIG. 4, the width of the non-image forming section 6 is W.
Then, in the case of full-size copying, the width of the original that is not copied by the non-image forming section 6 is also W, but in the case of reduced copying, if the magnification is n, the width of the original that is not copied by the non-image forming section 6 is W. /n(>W), and a wider portion will not be copied. This cannot be ignored in practice, as the smaller the magnification, the wider the area that will not be copied.
本発明は上記の問題点を解決することを目的と
する。 The present invention aims to solve the above problems.
以下本発明の一実施例を第5・6図に基づいて
説明する。第5図は本発明をスリツト露光方式複
写機の倍率変換光学系に適用した例を示し、その
光路を展開し、スリツトの長手方向をみた図であ
る。第2図の従来例との対比から明らかなよう
に、等倍複写の場合は従来と同様に原稿4の像を
G位置にあるレンズLによつてドラムの一定位置
に結像5Gさせる。即ち、原稿4の一側端4aの
像は、前記のように所定幅Wにわたつて画像が形
成されていない側の複写紙一側端に対応する感光
ドラム位置に一致させて結像される。しかし縮小
複写の場合は原稿4を非画像形成部以外の領域
(画像形成部)に結像5H′・5I′するようにレン
ズLをH′・I′の位置に移動させるようにしたもの
である。このときのレンズの光軸と垂直の方向へ
の移動量は原稿4の一側端4a(この一側端4a
は等倍複写の際も縮小複写の際も同一の基準位置
に合わせて設置される)の像の結像位置が非画像
部と画像部との境界になるようにする。たとえば
レンズLをH′位置に移動するときの光軸と垂直
の方向の移動量△l12′は、非画像部の巾をWとす
ると前記(1)式に於てS12=Wとなり、
△l12′
={(n1−n2)l1−W}/(1+n2)
となる。また、このときの倍率は定形の複写紙を
用いる場合は複写紙内に複写できるようにa2′・
b2′を定めるもので第2図例の場合に比べて若干
小さくする。なお、レンズLをI′位置に移動する
場合も同様の要領で移動するものである。 An embodiment of the present invention will be described below with reference to FIGS. 5 and 6. FIG. 5 shows an example in which the present invention is applied to a magnification conversion optical system of a slit exposure type copying machine, and is a diagram showing the optical path developed and viewed in the longitudinal direction of the slit. As is clear from the comparison with the conventional example shown in FIG. 2, in the case of full-size copying, the image of the original 4 is formed at a fixed position 5G on the drum by the lens L at the G position, as in the conventional case. That is, the image of the one side edge 4a of the original 4 is formed so as to coincide with the photosensitive drum position corresponding to the one side edge of the copy paper on the side where no image is formed over the predetermined width W as described above. . However, in the case of reduction copying, the lens L is moved to the positions H' and I' so that the original 4 is imaged 5H' and 5I' in areas other than the non-image forming area (image forming area). be. The amount of movement of the lens in the direction perpendicular to the optical axis at this time is the one side edge 4a of the original 4 (this one side edge 4a).
The imaging position of the image (which is set in alignment with the same reference position both during full-scale copying and reduced-size copying) is set at the boundary between the non-image area and the image area. For example, when moving the lens L to the H' position, the amount of movement △l 12 ' in the direction perpendicular to the optical axis is S 12 =W in equation (1) above, where W is the width of the non-image area. Δl 12 ′ = {(n 1 −n 2 )l 1 −W}/(1+n 2 ). In addition, when using standard copy paper, the magnification at this time is a 2 ′, so that it can be copied on the copy paper.
This determines b 2 ′, which is slightly smaller than that in the example in Figure 2. Incidentally, when moving the lens L to the I' position, the same procedure is used.
上記の手法により第6図a〜cに示すように複
写紙P1〜P3に画像5G・5H′・5I′を複写す
ることができる。 By the above method, images 5G, 5H', and 5I' can be copied onto copy sheets P1 to P3 as shown in FIGS. 6a to 6c.
つまり、複写紙P1,P2,P3は、その進行
方向と平行な一側端を一定位置に合わせて進行せ
しめられ、そしてこの複写紙の上記一側端側には
所定幅Wの非画像形成部6が設けられ、この非画
像形成部6で前記のように分離ベルト等により感
光ドラムから分離されるのであるが、原稿4の一
側端4aは第5図に示したように結像されるの
で、等倍複写時(第6図a)には原稿4の一側端
4a側の一部の像は非画像形成部6で欠落する
が、縮小複写時(第6図b,c)には原稿4の一
側端4aまでの像が欠落することなく複写され
る。 In other words, the copy sheets P1, P2, and P3 are advanced with one side edge parallel to the direction of travel aligned with a fixed position, and a non-image forming area of a predetermined width W is provided on the one side edge side of the copy sheet. 6, and in this non-image forming section 6, the original 4 is separated from the photosensitive drum by a separation belt or the like as described above, and one side edge 4a of the original 4 is imaged as shown in FIG. Therefore, part of the image on the one side edge 4a of the original 4 is missing in the non-image forming area 6 when copying at the same size (FIG. 6a), but when copying in reduced size (FIGS. 6b and c) The image up to one side edge 4a of the original 4 is copied without being missing.
以上本発明によれば、複写紙の進行方向と平行
な一側端を一定位置に合わせて進行させるととも
に、この複写紙の上記一側端の側に所定幅の非画
像形成部を設け、この非画像形成部で複写紙を分
離部材により可動感光体から分離する電子写真複
写機に於いて、等倍複写時には従来通り上記非画
像形成部により原稿の一部が欠落して複写される
ものの、等倍複写時と同じ量の情報がより狭い面
積に集中して行く縮小複写時には如上の欠落を回
避することができるもので、前述の従来の問題点
を解決することができ、この種の複写機の改良と
して有効適切である。 As described above, according to the present invention, the copy paper is advanced with one side edge parallel to the traveling direction aligned with a fixed position, and a non-image forming portion of a predetermined width is provided on the side of the one side edge of the copy paper. In an electrophotographic copying machine in which copy paper is separated from a movable photoreceptor by a separating member in a non-image forming section, when copying at the same size, a part of the document is missing and copied by the non-image forming section as before. During reduced copying, where the same amount of information is concentrated in a smaller area as during full-size copying, the above-mentioned omissions can be avoided, and the above-mentioned conventional problems can be solved, and this type of copying This is an effective and appropriate improvement for the machine.
第1図は倍率変換光学系の説明図、第2図は従
来複写機の倍率変換光学系の光路の展開図、第3
図a・b・cは複写紙と複写像との関係説明図、
第4図a・b・cは非画像形成部がある場合の同
上図、第5図は本発明複写機の倍率変換光学系の
光路の展開図、第6図a・b・cはその複写像と
複写紙の関係説明図。
1は原稿、Lはレンズ、M1・M2・M3・M
4は第1・2・3・4ミラー、2は原稿台ガラ
ス、3は感光ドラム、6は非画像部。
Figure 1 is an explanatory diagram of the magnification conversion optical system, Figure 2 is a developed view of the optical path of the magnification conversion optical system of a conventional copying machine, and Figure 3 is an explanatory diagram of the magnification conversion optical system.
Figures a, b, and c are explanatory diagrams of the relationship between copy paper and copy image,
Figures 4a, b, and c are the same diagrams when there is a non-image forming part, Figure 5 is a developed view of the optical path of the magnification conversion optical system of the copying machine of the present invention, and Figures 6a, b, and c are copies thereof. An explanatory diagram of the relationship between an image and copy paper. 1 is the original, L is the lens, M1, M2, M3, M
4 is the first, second, third, and fourth mirrors, 2 is the document table glass, 3 is the photosensitive drum, and 6 is the non-image area.
Claims (1)
に合わせて進行させるとともに、この複写紙の上
記一側端の側に所定幅の非画像形成部を設け、こ
の非画像形成部で複写紙を分離部材により可動感
光体から分離する、等倍及びそれ以外の少なくと
も1つの縮小倍率を選択して複写が行える電子写
真複写機であつて、等倍複写の際も縮小複写の際
も同一の基準位置に原稿の一側端を合わせて設置
する電子写真複写機に於いて、 等倍複写の際は、原稿の上記一側端を複写紙の
上記一側端に対応する感光***置に一致させて結
像するようにレンズを位置させ、 縮小複写の際は、原稿の上記一側端を複写紙の
非画像形成部と画像形成部との境界に対応する感
光***置に一致させて結像するようにレンズを位
置させることを特徴とする電子写真複写機の光学
装置。[Scope of Claims] 1. The copy paper is advanced with one side edge parallel to the traveling direction aligned with a fixed position, and a non-image forming part of a predetermined width is provided on the side of the one side edge of the copy paper. An electrophotographic copying machine that separates a copy paper from a movable photoreceptor by a separation member in a non-image forming part, and is capable of copying by selecting at least one reduction ratio other than the same magnification, and also when copying at the same magnification. In an electrophotographic copying machine that aligns one side edge of the original to the same reference position even when making a reduced copy, when making a full-size copy, place the one side edge of the original on the one side edge of the copy paper. Position the lens so that the image is aligned with the corresponding photoreceptor position, and when making a reduction copy, place the above-mentioned one side edge of the document on the photoreceptor corresponding to the boundary between the non-image forming area and the image forming area of the copy paper. An optical device for an electrophotographic copying machine, characterized in that a lens is positioned so as to form an image in accordance with a body position.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13149477A JPS5465525A (en) | 1977-11-04 | 1977-11-04 | Optical device for copying machine |
GB7836048A GB2007376B (en) | 1977-09-09 | 1978-09-07 | Copier |
DE19782839240 DE2839240A1 (en) | 1977-09-09 | 1978-09-08 | COPY DEVICE |
US06/138,981 US4264198A (en) | 1977-09-09 | 1980-04-10 | Copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13149477A JPS5465525A (en) | 1977-11-04 | 1977-11-04 | Optical device for copying machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5465525A JPS5465525A (en) | 1979-05-26 |
JPS6149652B2 true JPS6149652B2 (en) | 1986-10-30 |
Family
ID=15059302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13149477A Granted JPS5465525A (en) | 1977-09-09 | 1977-11-04 | Optical device for copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5465525A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152433A (en) * | 1983-02-18 | 1984-08-31 | Minolta Camera Co Ltd | Variable power electrophotographic copying machine |
-
1977
- 1977-11-04 JP JP13149477A patent/JPS5465525A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5465525A (en) | 1979-05-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4068950A (en) | Variable platen cover | |
JPH0466495B2 (en) | ||
JPS631581B2 (en) | ||
US4088401A (en) | Optical system for alternatively projecting adjacent images of adjacent objects or double images of a single object | |
JPS6149652B2 (en) | ||
JPH02211770A (en) | Analog copying machine with edit function | |
JPS6238446A (en) | Scanning type variable power image forming device | |
US4110023A (en) | Optical system for alternatively projecting adjacent images of adjacent objects or double images of a single object | |
JPH0261745B2 (en) | ||
JPH01293363A (en) | Image forming device | |
JPH0314184B2 (en) | ||
JPS62204271A (en) | Trimming copying device | |
JP3181336B2 (en) | Image forming device | |
JP3110748B2 (en) | Image processing device | |
JPS6225771A (en) | Exposing device for copying machine | |
JPS592010B2 (en) | Aperture device of slit exposure variable magnification copying machine | |
JPS63304276A (en) | Color image recorder | |
JPS61156112A (en) | Copying machine of composite copy | |
JPS62231243A (en) | Copying machine with split copying function | |
JPH06289498A (en) | Image forming device | |
JPS62172338A (en) | Copying machine with variable magnification | |
JPS63180972A (en) | Copying device | |
JPH08146834A (en) | Image forming device | |
JPS6018972B2 (en) | Exposure compensation device for copying machines | |
JPS6225743A (en) | Exposing device for copying machine |