JPH0225511B2 - - Google Patents

Info

Publication number
JPH0225511B2
JPH0225511B2 JP20134481A JP20134481A JPH0225511B2 JP H0225511 B2 JPH0225511 B2 JP H0225511B2 JP 20134481 A JP20134481 A JP 20134481A JP 20134481 A JP20134481 A JP 20134481A JP H0225511 B2 JPH0225511 B2 JP H0225511B2
Authority
JP
Japan
Prior art keywords
projection lens
magnification
reference position
lens
movement
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
Application number
JP20134481A
Other languages
Japanese (ja)
Other versions
JPS58102252A (en
Inventor
Hisakatsu Takahashi
Yoshuki Ishidate
Hiromitsu Okada
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.)
Tokyo Kogaku Kikai KK
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Tokyo Kogaku Kikai KK
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 Fuji Xerox Co Ltd, Tokyo Kogaku Kikai KK filed Critical Fuji Xerox Co Ltd
Priority to JP20134481A priority Critical patent/JPS58102252A/en
Priority to GB08233337A priority patent/GB2111714B/en
Publication of JPS58102252A publication Critical patent/JPS58102252A/en
Publication of JPH0225511B2 publication Critical patent/JPH0225511B2/ja
Granted legal-status Critical Current

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)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Exposure Or Original Feeding In Electrophotography (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） 本発明はマイクロフイルム複写機において連続
変倍で複写可能とした複写機に係る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a microfilm copying machine that is capable of continuously changing magnification.

（従来の技術） 現在、マイクロフイルム複写機においては連続
変倍で複写可能なものはなく、変倍可能として
も、何本かの投影レンズを有しそのレンズをフイ
ルムの投影光軸上に切換えて段階的に変倍可能と
することを要する。(Prior art) Currently, there are no microfilm copying machines that can continuously change the magnification, and even if the magnification could be changed, it would have several projection lenses and the lenses would have to be switched on the film projection optical axis. It is necessary to make it possible to change the magnification in stages.

（発明が解決しようとする課題） 上述の複写機において変倍の段階を増せばその
変倍段階の数だけの投影レンズを設けなければな
らず、高価且つ、投影レンズ部の装置が大きなも
のとなる不都合がある。(Problems to be Solved by the Invention) If the number of magnification changing stages is increased in the above-mentioned copying machine, it is necessary to provide as many projection lenses as there are magnification changing stages, which results in an expensive and large projection lens unit. There is a certain inconvenience.

更に、単一レンズを使用し、このレンズのバツ
クフオーカスを移動させ、且つ、反射光学系をも
移動させて連続変倍を可能にする光学系から構成
される複写機も考えられる。上記移動量の計算式
においては定数として投影レンズの焦点距離ｆを
使用するが、単一レンズの焦点距離ｆを一般的な
方法（例えばノーダル・スライド方法）によつて
求めても、このｆの測定精度は小数点以下１桁が
限度であり解像力及び倍率精度を良い複写を得る
ことは不可能である。 Furthermore, a copying machine can be considered that includes an optical system that uses a single lens, moves the back focus of this lens, and also moves a reflective optical system to enable continuous magnification change. In the calculation formula for the amount of movement above, the focal length f of the projection lens is used as a constant, but even if the focal length f of a single lens is determined by a general method (for example, the nodal slide method), The measurement accuracy is limited to one decimal place, and it is impossible to obtain a copy with good resolution and magnification accuracy.

本発明は、従来の複写機の変倍に関するこのよ
うな問題を解決することを目的とするものであつ
て、複数個のレンズではなく単一投影レンズを用
い、バツクフオーカス移動距離及び平行反射光学
系の移動距離の演算に使用するレンズ焦点距離に
該当する定数を精度良く求め、解像力の優秀なマ
イクロ複写機を提供する。 The present invention aims to solve such problems regarding magnification of conventional copying machines, and uses a single projection lens instead of multiple lenses to reduce the back focus movement distance and the parallel reflection optical system. To provide a microcopying machine with excellent resolution by accurately determining a constant corresponding to the focal length of a lens used to calculate a moving distance.

（発明の構成） 本発明は、原稿の像を投影する固定焦点距離の
投影レンズ、該投影レンズを光軸上で移動させる
ことができ、かつ、該投影レンズの移動の基準位
置が調整可能に構成されたレンズ移動装置、上記
投影レンズより感材ドラムに至る光路長を変更す
るように移動可能な反射系部材、及び該反射系部
材を移動させることができ、かつ、該反射系部材
の移動の基準位置が固定された反射系部材移動装
置とを有する連続変倍可能な複写機において、 複写機を組み立てた後に、次の手順で光学系を
調整し、 (A) 前記反射系部材を前記固定された基準位置に
配置し、前記投影レンズを移動させて感材ドラ
ム上に原稿像を合焦し、この時の原稿像の倍率
M0を測定すると共に、合焦したレンズの位置
を基準位置に設定する； (B) 次に、上記基準位置にある投影レンズと感材
ドラムとの光路長をｂだけ変化するように前記
反射系部材を光軸上で移動させ、更に投影レン
ズを光軸上に移動させて感材ドラム上に原稿像
を合焦し、この時の原稿像の倍率M′を測定す
る； 上記調整が終了した後、 Ｋ＝ｂ／（１／M0−１／M′＋M0−M′） を求め、 倍率Ｍで投影するときは、投影レンズを次式で
与えられるaxだけ上記設定された基準位置から
移動させ、 ax＝（１／M0−１／Ｍ）Ｋ また、上記基準位置にある投影レンズと感材ド
ラムとの光路長が次式で与えられるbxだけ変化
するように、 bx＝（１／Ｍ−１／M0＋Ｍ−M0）Ｋ 反射系部材を上記固定された基準位置から移動
させるように構成した複写機の連続変倍方法であ
る。(Structure of the Invention) The present invention provides a fixed focal length projection lens for projecting an image of a document, the projection lens being movable on the optical axis, and a reference position for movement of the projection lens being adjustable. a lens moving device configured, a reflective system member movable so as to change the optical path length from the projection lens to the photosensitive material drum, and a reflective system member capable of moving the reflective system member; In a continuously variable copying machine having a reflection system member moving device whose reference position is fixed, after assembling the copying machine, adjust the optical system according to the following steps, and (A) move the reflection system member to the above position. The document image is placed at a fixed reference position, and the projection lens is moved to focus the document image on the photosensitive material drum, and the magnification of the document image at this time is
Measure M 0 and set the focused lens position as the reference position; (B) Next, adjust the reflection so that the optical path length between the projection lens and the photosensitive drum at the reference position changes by b. The system members are moved on the optical axis, and the projection lens is further moved on the optical axis to focus the original image on the sensitive material drum, and the magnification M' of the original image at this time is measured; the above adjustment is completed. After that, calculate K=b/(1/M 0 -1/M'+M 0 -M'), and when projecting at magnification M, move the projection lens to the reference position set above by ax given by the following formula. Then, ax=(1/M 0 -1/M)K In addition, bx=( 1/M-1/M 0 +M-M 0 )K This is a continuous magnification changing method for a copying machine configured to move a reflection system member from the fixed reference position.

（実施例） 以下、本発明の第１実施例を図に基づいて説明
する。連続変倍方式の複写機は、第１図に示すよ
うに、焦光レンズ、ランプ等からなる光源装置
１、マイクロフイルムを装着しこれを走査する走
査系２、焦点距離ｆであり光軸方向にバツクフオ
ーカス移動の為の移動装置を有する投影レンズ３
（移動を矢線ａで示す）、及び、この移動装置の定
位置停止させる位置検出装置７、光路の方向を変
え且つ光路長変更の為に移動可能な反射光学系部
４（移動を矢線ｂで示す）、更にこの移動を所定
の位置に停止させる位置検出装置８、固定された
反射ミラー５、及び光感材ドラム６によつて構成
される。(Example) Hereinafter, a first example of the present invention will be described based on the drawings. As shown in Fig. 1, a continuous magnification type copying machine has a light source device 1 consisting of a focusing lens, a lamp, etc., a scanning system 2 that attaches a micro film and scans it, and a focal length f and a direction of the optical axis. a projection lens 3 having a moving device for back focus movement;
(movement is indicated by arrow a), a position detection device 7 for stopping this moving device at a fixed position, and a reflective optical system unit 4 movable for changing the direction of the optical path and changing the optical path length (movement is indicated by arrow a). b), further includes a position detection device 8 for stopping this movement at a predetermined position, a fixed reflection mirror 5, and a photosensitive drum 6.

第１図を光学原理的に示すと、第２図及び第３
図に示すようになる。第２図は、投影レンズ３及
び反射光学系部４が第１図の実線で示す基準位置
にあり、倍率M0のときの状態を示す。 If Figure 1 is shown in optical principle, Figures 2 and 3
The result will be as shown in the figure. FIG. 2 shows a state in which the projection lens 3 and the reflective optical system section 4 are at the reference position shown by the solid line in FIG. 1, and the magnification is M 0 .

第３図は、投影レンズ３及び反射光学系部４を
第２図に示す基準位置よりａ、ｂ／２だけ移動さ
せて第１図の点線に示す３′，４′の位置とした、
倍率M′のときの状態を示す。すなわち、ａは投
影レンズ３の移動量であり、ｂは反射光学系部４
の移動による基準位置にある投影レンズ３から光
感材ドラム６の感光面６′までの距離の変化量で
ある。 In FIG. 3, the projection lens 3 and the reflective optical system section 4 are moved by a and b/2 from the reference position shown in FIG. 2 to positions 3' and 4' shown by dotted lines in FIG.
The state when the magnification is M' is shown. That is, a is the amount of movement of the projection lens 3, and b is the amount of movement of the reflective optical system section 4.
This is the amount of change in the distance from the projection lens 3 at the reference position to the photosensitive surface 6' of the photosensitive material drum 6 due to the movement of .

倍率M′の状態を示す第３図において、l1は走査
系２から投影レンズ３の前側主点までの距離であ
り、l2は投影レンズ３の後側主点から光感材ドラ
ム６の感光面６′までの距離である。 In FIG. 3 showing the state of magnification M', l 1 is the distance from the scanning system 2 to the front principal point of the projection lens 3, and l 2 is the distance from the rear principal point of the projection lens 3 to the photosensitive drum 6. This is the distance to the photosensitive surface 6'.

第２図及び第３図において、次式が導き出され
る。なお、第２図及び第３図におけるΔHは投影
レンズ３の主点間距離を示すものとする。 In FIGS. 2 and 3, the following equation is derived. Note that ΔH in FIGS. 2 and 3 indicates the distance between the principal points of the projection lens 3.

ａ＝（１／M′−１／M0） ………(1) ｂ＝（１／M0−１／M′＋M0−M′）ｆ ………(2) 即ち、投影レンズ３の焦点距離ｆと、基準位置
に停止したときの倍率M0を定数として、上記の
ａ、ｂを演算させて、移動量を制御することによ
り、連続変倍は理論上可能となる。 a=(1/M'-1/ M0 )......(1) b=(1/ M0-1 /M'+ M0 -M')f......(2) That is, the projection lens 3 Continuous magnification is theoretically possible by calculating the above a and b using the focal length f and the magnification M 0 when stopped at the reference position as constants and controlling the amount of movement.

次に、レンズ３の被写体側の深度Δは次の概略
式で表わされる。 Next, the depth Δ of the lens 3 on the subject side is expressed by the following general formula.

Δ＝ε・Ｆ・（１＋１／Ｍ） ………(3) 但し、ε：解像力の逆数 Ｆ：レンズ３のＦ値 Ｍ：倍率 Ｆは複写機の実用上、ほぼ一定の範囲の値で、
例えばＦ＝４〜10というような値である。 Δ=ε・F・(1+1/M) ......(3) However, ε: Reciprocal of resolving power F: F value of lens 3 M: Magnification F is a value within an almost constant range for the practical use of copying machines,
For example, F=4 to 10.

又、倍率M′は次式で表わされる。 Also, the magnification M' is expressed by the following equation.

M′＝l2／l1 ………(4) 即ち、複写される像の解像力を上げ、且つ倍率
精度を高くするにはバツクフオーカスの位置決め
精度、移動反射系の位置決め精度に依つていて、
その精度は、演算式の定数であるM0、ｆの測定
精度に基づいている。 M′=l 2 /l 1 ………(4) In other words, increasing the resolution of the copied image and the magnification accuracy depend on the positioning accuracy of the back focus and the positioning accuracy of the movable reflection system.
Its accuracy is based on the measurement accuracy of M 0 and f, which are constants in the arithmetic expression.

さて、基準位置停止時の倍率M0は基準被写体、
及びドラム側に設ける基準尺により精密に求めら
れるが、投影レンズ３の焦点距離は一般的方法
（例えばノーダルスライド法）では小数点以下１
桁が精度の限界である。それ故、単にレンズ３の
焦点距離ｆを定数として使うのでは、解像力、倍
率は精度よく得られない。 Now, the magnification M 0 when stopping at the reference position is the reference object,
Although the focal length of the projection lens 3 is precisely determined using a standard scale provided on the drum side, the focal length of the projection lens 3 is determined by one decimal point in a general method (for example, the nodal slide method).
Digits are the limit of precision. Therefore, simply using the focal length f of the lens 3 as a constant does not provide accurate resolution and magnification.

これの解決手段としてｆ値の代わりに、以下に
示す定数Ｋを精度よく求め、この定数Ｋをｆ値の
代りに用いることにより、連続変倍時の投影レン
ズ３及び反射光学系部４の移動を行うのである。 As a solution to this problem, the constant K shown below is determined with high precision instead of the f value, and by using this constant K instead of the f value, the movement of the projection lens 3 and the reflective optical system section 4 during continuous magnification change is achieved. This is what we do.

次に、本発明により上記式(1)(2)に基づいて所定
倍率を高精度に達成する方法について説明する。
まず、反射光学系部４を、第１図に実線及び第２
図で示すように、任意の位置に配置し、この時感
光面６′に走査系２の結像合焦して鮮明な像を形
成するように投影レンズ３を調整する。この状態
での投影レンズ３及び反射光学系部４の位置を基
準位置とし、また投影倍率M0を精密に測定する。 Next, a method of achieving a predetermined magnification with high precision based on the above equations (1) and (2) according to the present invention will be described.
First, the reflective optical system section 4 is shown as a solid line in FIG.
As shown in the figure, the projection lens 3 is placed at an arbitrary position and the projection lens 3 is adjusted so that the scanning system 2 is focused on the photosensitive surface 6' to form a clear image. The positions of the projection lens 3 and reflective optical system section 4 in this state are set as reference positions, and the projection magnification M 0 is precisely measured.

続いて、第１図実線及び第３図に示すように、
全光学系の光路長がｂだけ変化するように反射光
学系部４を移動する。さらに、投影レンズ３をａ
だけ移動させて感光面６′上の走査系２の結像を
合焦させる。この時の反射光学系部４の基準位置
に対する移動量ｂ／２及び投影倍率M′を精密に
測定する。これらの測定によつて得たM0、M′、
ｂより(2)式を用いて、 Ｋ＝ｂ／（１／M0−１／M′＋Ｍ−M′）
………(5) を求める。 Next, as shown in the solid line in Figure 1 and in Figure 3,
The reflective optical system section 4 is moved so that the optical path length of the entire optical system changes by b. Furthermore, the projection lens 3 is
to focus the image of the scanning system 2 on the photosensitive surface 6'. At this time, the amount of movement b/2 of the reflective optical system section 4 relative to the reference position and the projection magnification M' are precisely measured. M 0 , M′, obtained by these measurements
From b, using equation (2), K=b/(1/M 0 -1/M'+M-M')
......(5) is found.

そして、所望の倍率Ｍにおける投影レンズ３の
基準位置に対する移動量axと反射光学系部４の
移動による基準位置にある投影レンズと感材ドラ
ムとの光路長の変化量bxとは、上記Ｋ値をｆ値
の代りに用い、更に上記(1)(2)式より ax＝（１／M0−１／Ｍ）Ｋ ………(6) bx＝（１／Ｍ−１／M0＋Ｍ−M0）Ｋ ………(7) となる。従つて、上記(6)(7)式より投影レンズの移
動量ax及び第１図の反射光学系部の移動量bx／
２を制御系にて演算し、投影レンズ、反射光学系
部を移動させる。 The amount of movement ax of the projection lens 3 with respect to the reference position at the desired magnification M and the amount of change bx in the optical path length between the projection lens and the photosensitive material drum at the reference position due to the movement of the reflective optical system section 4 are the above-mentioned K value. is used in place of the f value, and further, from equations (1) and (2) above, ax=(1/M 0 -1/M)K ......(6) bx=(1/M-1/M 0 +M- M 0 )K ......(7). Therefore, from equations (6) and (7) above, the amount of movement ax of the projection lens and the amount of movement bx of the reflective optical system section in FIG.
2 is calculated by the control system, and the projection lens and reflective optical system section are moved.

第２実施例は、第４図に示すように、光源装置
１の光軸と光感材ドラム６の光軸が直交するよう
に構成されている。 In the second embodiment, as shown in FIG. 4, the optical axis of the light source device 1 and the optical axis of the photosensitive material drum 6 are configured to be perpendicular to each other.

第３実施例は、第５図に示すように、光源装置
１、投影レンズ３及び１枚の鏡のみからなる反射
光学系部４が一体となつて移動するように構成さ
れている。従つて、上記光源装置１、投影レンズ
３及び反射光学系部４の移動量がそのまま基準位
置にある投影レンズと感材ドラムとの光路長の変
化量ｂとなる。 In the third embodiment, as shown in FIG. 5, a light source device 1, a projection lens 3, and a reflection optical system section 4 consisting of only one mirror are configured to move together. Therefore, the amount of movement of the light source device 1, the projection lens 3, and the reflective optical system section 4 directly becomes the amount of change b in the optical path length between the projection lens and the photosensitive material drum at the reference position.

（発明の効果） 本発明によれば、高精度に測定することが困難
な投影レンズの焦点距離を測定することを要せ
ず、投影レンズを実際に複写機に組込んでその光
路長及び倍率を測定し、この測定値に基づいて所
望の倍率を得るに必要な投影レンズ及び反射光学
系部の移動量を演算することができる。従つて、
比較的簡易な測定によつて高精度の倍率で鮮明な
複写を得ることができる利点を有する。(Effects of the Invention) According to the present invention, it is not necessary to measure the focal length of a projection lens, which is difficult to measure with high precision, and the projection lens can be actually incorporated into a copying machine to determine its optical path length and magnification. It is possible to measure the amount of movement of the projection lens and reflective optical system section necessary to obtain the desired magnification based on this measured value. Therefore,
It has the advantage that clear copies can be obtained with high precision magnification through relatively simple measurements.

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

第１図は本発明方法の第１実施例の光学図、第
２，３図は第１図光学系の幾何学的表示の図であ
り、第２図は第１図の実線状態の定位置停止位置
にある場合の図、第３図は第１図の破線状態であ
る任意倍率にある場合の図、第４図は第２実施例
の光学図、第５図は第３実施例の光学図である。 １……光源装置、２……走査系、３……投影レ
ンズ、４……反射光学系部、５……固定反射ミラ
ー、６……光感材ドラム、７，８……位置検出装
置。 FIG. 1 is an optical diagram of the first embodiment of the method of the present invention, FIGS. 2 and 3 are geometric representations of the optical system in FIG. 1, and FIG. 2 is a fixed position of the solid line state in FIG. Figure 3 is a diagram of the case at the stop position, Figure 3 is a diagram of the arbitrary magnification shown by the broken line in Figure 1, Figure 4 is an optical diagram of the second embodiment, and Figure 5 is an optical diagram of the third embodiment. It is a diagram. DESCRIPTION OF SYMBOLS 1... Light source device, 2... Scanning system, 3... Projection lens, 4... Reflection optical system part, 5... Fixed reflection mirror, 6... Photosensitive material drum, 7, 8... Position detection device.

Claims (1)

【特許請求の範囲】 １ 原稿の像を投影する固定焦点距離の投影レン
ズ、該投影レンズを光軸上で移動させることがで
き、かつ、該投影レンズの移動の基準位置が調整
可能に構成されたレンズ移動装置、上記投影レン
ズより感材ドラムに至る光路長を変更するように
移動可能な反射系部材、及び該反射系部材を移動
させることができ、かつ、該反射系部材の移動の
基準位置が固定された反射系部材移動装置とを有
する連続変倍可能な複写機において、 複写機を組み立てた後に、次の手順で光学系を
調整し、 (A) 前記反射系部材を前記固定された基準位置に
配置し、前記投影レンズを移動させて感材ドラ
ム上に原稿像を合焦し、この時の原稿像の倍率
M0を測定すると共に、合焦したレンズの位置
を基準位置に設定する； (B) 次に、上記基準位置にある投影レンズと感材
ドラムとの光路長をｂだけ変化するように前記
反射系部材を光軸上で移動させ、更に投影レン
ズを光軸上に移動させて感材ドラム上に原稿像
を合焦し、この時の原稿像の倍率M′を測定す
る； 上記調整が終了した後、 Ｋ＝ｂ／（１／M0−１／M′＋M0−M′） を求め、 倍率Ｍで投影するときは、投影レンズを次式で
与えられるaxだけ上記設定された基準位置から
移動させ、 ax＝（１／M0−１／Ｍ）Ｋ また、上記基準位置にある投影レンズと感材ド
ラムとの光路長が次式で与えられるbxだけ変化
するように、 bx＝（１／Ｍ−１／M0＋Ｍ−M0）Ｋ 反射系部材を上記固定された基準位置から移動
させるように構成した複写機の連続変倍方法。[Scope of Claims] 1. A projection lens with a fixed focal length that projects an image of an original, the projection lens being movable on an optical axis, and a reference position for movement of the projection lens being adjustable. a lens moving device, a reflection system member movable to change the optical path length from the projection lens to the photosensitive drum, and a reflection system member capable of moving, and a reference for movement of the reflection system member. In a continuously variable copying machine having a reflective system member moving device whose position is fixed, after assembling the copying machine, adjust the optical system according to the following steps, and (A) move the reflective system member to the fixed position. The projection lens is moved to focus the original image on the sensitive material drum, and the magnification of the original image at this time is
Measure M 0 and set the focused lens position as the reference position; (B) Next, adjust the reflection so that the optical path length between the projection lens and the photosensitive drum at the reference position changes by b. The system members are moved on the optical axis, and the projection lens is further moved on the optical axis to focus the original image on the sensitive material drum, and the magnification M' of the original image at this time is measured; the above adjustment is completed. After that, calculate K=b/(1/M 0 -1/M'+M 0 -M'), and when projecting at magnification M, move the projection lens to the reference position set above by ax given by the following formula. Then, ax=(1/M 0 -1/M)K In addition, bx=( 1/M-1/M 0 +M-M 0 )K A continuous magnification changing method for a copying machine configured to move a reflective member from the fixed reference position.
JP20134481A 1981-12-14 1981-12-14 Continuous magnification varying method for copying machine Granted JPS58102252A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP20134481A JPS58102252A (en) 1981-12-14 1981-12-14 Continuous magnification varying method for copying machine
GB08233337A GB2111714B (en) 1981-12-14 1982-11-23 Determining the focal length of a projection lens in a copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20134481A JPS58102252A (en) 1981-12-14 1981-12-14 Continuous magnification varying method for copying machine

Publications (2)

Publication Number Publication Date
JPS58102252A JPS58102252A (en) 1983-06-17
JPH0225511B2 true JPH0225511B2 (en) 1990-06-04

Family

ID=16439469

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20134481A Granted JPS58102252A (en) 1981-12-14 1981-12-14 Continuous magnification varying method for copying machine

Country Status (2)

Country Link
JP (1) JPS58102252A (en)
GB (1) GB2111714B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH075480Y2 (en) * 1990-09-27 1995-02-08 株式会社東芝 Image forming device

Also Published As

Publication number Publication date
GB2111714B (en) 1985-08-14
GB2111714A (en) 1983-07-06
JPS58102252A (en) 1983-06-17

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