JPS5933444A - Driving device of optical system - Google Patents

Driving device of optical system

Info

Publication number
JPS5933444A
JPS5933444A JP14278982A JP14278982A JPS5933444A JP S5933444 A JPS5933444 A JP S5933444A JP 14278982 A JP14278982 A JP 14278982A JP 14278982 A JP14278982 A JP 14278982A JP S5933444 A JPS5933444 A JP S5933444A
Authority
JP
Japan
Prior art keywords
cam
optical system
return spring
moving bodies
start point
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
JP14278982A
Other languages
Japanese (ja)
Inventor
Hiroshi Ikeda
宏 池田
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 JP14278982A priority Critical patent/JPS5933444A/en
Publication of JPS5933444A publication Critical patent/JPS5933444A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00Photographic printing apparatus
    • G03B27/32Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52Details
    • G03B27/522Projection optics
    • G03B27/525Projection optics for slit exposure
    • G03B27/526Projection optics for slit exposure in which the projection optics move

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE:To synchronize an optical system and a photoreceptor each other to stabilize the exposure scanning, by constituting the device so that the variance of the number of revolutions of a cam, which is generated by the energizing force of a energizing means when an original scanning means is moved backward, is absorbed by the shape of the cam. CONSTITUTION:When a cam 19 is moved eccentrically counterclockwise, a cam follower arm 18 is rocked counterclockwise around a shaft 17 through a cam follower 20 brought into contact with the circumferential face of the cam 19, and moving bodies 2 and 5 holding a light source 3 and mirrors 4 and 6 through a wire 16 and pulleys 15 and 14 are moved forward in the direction of an arrow A to perform the exposure scanning of an original. When moving bodies are moved backward after passing a backward movement start point P on the circumferential face of the cam, the number of revolutions of the cam is increased more than needs by the energizing force of a return spring 13; and therefore, the angle between the point P and a forward movement start point P0 around a center 26 is made wider a little to absorb the variance of the increase of the rotation number of the cam. Thus, the time of the forward movement of moving bodies is synchronized with a photoreceptor 21 driven by an independent system to stabilize the exposure scanning even at a continuous copying time.

Description

【発明の詳細な説明】 技術分野 本発明は電子複写機等の光学系駆動装置、更に詳しくは
、光学系をカムによって往動させ、復帰スプリングによ
って復動させる光学系駆動装置に関する。
TECHNICAL FIELD The present invention relates to an optical system drive device for an electronic copying machine or the like, and more particularly to an optical system drive device for moving an optical system forward by a cam and backward by a return spring.

従来技術 従来、この種の光学系駆動装置は第1図ta)に示すよ
うに、ミラー、ランプ等の光学系を保持する移動体−)
がブーIJ−(I’l)、(P2)に捲回されたワイヤ
ー〇’)に取り付けられ、駆動源fd)に・よって回転
するカム+に+の偏心運動がカムフォロワー(「)に伝
達されて移動体(In+を往動させ、移動体+1111
が?I−動している際、復帰スプリング(51のバネ力
か蓄積され、移動体−)はこの復帰スプリングts)に
よって復動する。
BACKGROUND TECHNOLOGY Conventionally, this type of optical system driving device is a movable body that holds an optical system such as a mirror or a lamp, as shown in Fig. 1 (ta).
is attached to the wire 〇') wound around the boot IJ- (I'l), (P2), and the eccentric movement of the cam + is transmitted to the cam follower (''), which is rotated by the driving source fd). The mobile body (In+ is moved forward, the mobile body +1111
but? When moving, the return spring (the spring force of 51 is accumulated, and the movable body) is moved back by this return spring ts).

この様に構成された光学系駆動装置では、復帰スプリン
グis]のバネ力によってカムフォロワー(f)。
In the optical system drive device configured in this way, the cam follower (f) is activated by the spring force of the return spring (is).

がカムik1周面に押圧されているため、この押圧力の
カムtk1周面接線方向の分力により、カムtk)の復
動時の回転速度が増速される。特に、光学系走査用駆動
源を複写機本体の主駆動源と別に設けた構成の場合、光
学系走査用駆動源のトルクか小さく設定されているため
、第1図(1))実線に示すような感光体との周期を取
るためのカムtklの理想曲線に従ってカム形状を決め
ても、復帰スプリング(9)によってカム(k)の回転
速度の増速を阻止することができず、光学系走査用駆動
源の回転速度も増速さtrる。
is pressed against the circumferential surface of the cam ik1, the component force of this pressing force in the direction of the circumferential surface of the cam tk1 increases the rotational speed of the cam tk) during the backward movement. In particular, in the case of a configuration in which the drive source for scanning the optical system is provided separately from the main drive source of the main body of the copying machine, the torque of the drive source for scanning the optical system is set to be small, as shown by the solid line (1) in Figure 1. Even if the cam shape is determined according to the ideal curve of the cam tkl to obtain the period with the photoreceptor, the return spring (9) cannot prevent the rotational speed of the cam (k) from increasing, and the optical system The rotational speed of the scanning drive source is also increased.

従って、移動体(m)の往復動の時間が感光体との同期
を取る為に設定した時間よりも短くなり、連続複写の場
合には短くなった時間だけカム(klの回転を伴出しな
りれはならないため、制御が複雑になる。
Therefore, the time for the reciprocating movement of the moving body (m) is shorter than the time set to synchronize with the photoreceptor, and in the case of continuous copying, the rotation of the cam (kl) is accompanied by the shortened time. control becomes complicated.

また、カム+に+の回転速度の増速か著しい場合には、
第1図(9)に示すように、復動終了前において回転速
度か変動して移動体(In1等に振動を与えることにな
る。従って、復動後直ちに往動をくり返す場合にはiE
確な走査速度が得られなくなり、露光か乱れて画像に悪
影響を及ぼずことになる。
Also, if the rotational speed of cam + increases significantly,
As shown in Figure 1 (9), the rotational speed fluctuates before the end of the backward motion, giving vibration to the moving body (In1, etc.). Therefore, if the forward motion is repeated immediately after the backward motion, the iE
It is no longer possible to obtain a precise scanning speed, and the exposure is disturbed and the image is not adversely affected.

目     的 本発明は上記欠点に鑑みてなされたものであり、その目
的は、カム及び光学系走査用駆動源の回転速度が復帰ス
プリングによって増速されても、光学系と感光体ドラム
との同期か取れ、露光走査に悪影響を及ぼさない光学系
駆動装置を提供することにある。
Purpose The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to maintain synchronization between the optical system and the photoreceptor drum even if the rotational speed of the cam and optical system scanning drive source is increased by the return spring. It is an object of the present invention to provide an optical system driving device that is easy to use and does not adversely affect exposure scanning.

発明の要旨 上記目的を達成するため、本発明に係わる光学系駆動装
置のカムは、復動の際利手手段の付勢力により生ずるカ
ムの回転変動を吸収できる形状とされていることにある
SUMMARY OF THE INVENTION In order to achieve the above object, the cam of the optical system drive device according to the present invention has a shape that can absorb rotational fluctuations of the cam caused by the biasing force of the hand means during backward movement.

実施例 第2図は本発明を適用した光学系駆動装置(1)を示す
ものである。
Embodiment FIG. 2 shows an optical system driving device (1) to which the present invention is applied.

図において、(2)は光源(3)と第1ミラー(4)を
保持する第1移動体であり、(5)は第2ミラー(6)
を保持する第2移動体であって、両者は複写機本体に設
けられている移動フレーム+7)−]−を摺動Fil能
に設けられている。第1移動体(2)と第2移動体(5
)は、軸+8+、 (91に固設されたプーリー(10
)、 (10)及び(+1)。
In the figure, (2) is the first moving body that holds the light source (3) and the first mirror (4), and (5) is the second mirror (6).
The second movable body holds a second movable body, both of which are provided in a sliding manner on a movable frame +7)-]- provided in the main body of the copying machine. The first moving body (2) and the second moving body (5)
) is the shaft +8+, (the pulley (10
), (10) and (+1).

(月)に巻装されたワイヤー(12)、 (12)  
に取付けられている。軸(8)には一端を複写機本体に
止着された復帰スプリング(13)が、軸(8)の時計
方向の回動によって復帰バネ力を蓄積するように巻回さ
れ、スプリング(13)の他端は軸(8)に止着されて
いる。
Wire wrapped around (12), (12)
installed on. A return spring (13) whose one end is fixed to the copying machine body is wound around the shaft (8) so as to accumulate a return spring force by clockwise rotation of the shaft (8), and the spring (13) The other end is fixed to the shaft (8).

また、軸(8)にはプーリー(14)が設けられており
、プーリー(14)には、一端をこのプーリー(14)
に止着され他端をブー’J−(+5)を介して複写機本
体に止着されているワイヤー(+6)か巻回されている
Further, the shaft (8) is provided with a pulley (14), and one end of the pulley (14) is connected to the pulley (14).
A wire (+6) is wound around the main body of the copying machine, the other end of which is fixed to the main body of the copying machine via a wire (+5).

ブーIJ−(+5)は支持軸(17)を中心として揺動
するカムフォロワアーム(18)に回転自在に設けられ
ていると共に、カムツメロワアーム’(+8)の略中央
m<には、後述するカム(19)の周面に当接するカム
フォロワ(20)か回転自在に設けられている。カム(
19)は本発明に係わる形状を有するものであり、光学
系駆動用モーター(M、+)によって反時H]方向に回
転する。モーター(fvl)は光学系のみに使用される
ので、小型・低出力のものに設定されている。
The boot IJ-(+5) is rotatably provided on the cam follower arm (18) that swings around the support shaft (17), and is located approximately at the center m< of the cam follower arm '(+8) as will be described later. A cam follower (20) that contacts the circumferential surface of the cam (19) is rotatably provided. cam(
19) has a shape according to the present invention, and is rotated in the counterclockwise H] direction by the optical system drive motor (M, +). Since the motor (fvl) is used only for the optical system, it is set to be small and low output.

感光体ドラム(21)には、メインモーター(M2)の
駆動力かプーリー(22)、 (23)及びギア(2/
I)、 (25)を介して伝達される。
The photosensitive drum (21) is driven by the driving force of the main motor (M2), pulleys (22), (23) and gears (2/2).
I), (25).

−1−3己積1戊において、モーター(八41)によっ
てノ1ム(19)が反時計方向に回転されると、カム(
19)周面がカムフォロワ(20)に当接しなから偏心
運動するため、カムフォロワアーム(18)か軸(17
)を中心に反時計方向に揺動する。アーム(]+8が揺
動するとブー’J−(+5)も反時計方向に揺動するた
め、ワイヤー(16)がプーリー(14)から巻き出さ
れるに応してブーIJ−(+/I)か時計方向に回転し
、ブーIJ−(10)、 (10’)、(I+)、 (
+1)、及O・ワイヤ(+2)、 (+2)を介して第
1移動体(2)と第2移動体(5)を矢印い)方向に往
動させて、図示しない複写原稿の露光走査を行う。この
露光走査中に復帰スプリンタ(+:3)の復帰バネ力が
蓄積される。
-1-3 When the numeral (19) is rotated counterclockwise by the motor (841) when the motor (841) is at the position of 1, the cam (
19) Since the peripheral surface moves eccentrically without contacting the cam follower (20), the cam follower arm (18) or the shaft (17)
) in the counterclockwise direction. When arm (]+8 swings, Boo'J-(+5) also swings counterclockwise, so as the wire (16) is unwound from the pulley (14), Boo'J-(+/I) or clockwise, Boo IJ- (10), (10'), (I+), (
The first moving body (2) and the second moving body (5) are moved forward in the direction of the arrow A) via the O-wires (+1), (+2), and (+2) to expose and scan the copy document (not shown). I do. During this exposure scan, the return spring force of the return splinter (+:3) is accumulated.

露光走査か完了するタイミンクで、カム(19)の回転
中心(26)からカム周面まての径の中で最大になるカ
ム周面」―の点、即ち、復動開始点間かカムツメロワ(
20)に位置する。往動時は、カム(+!l)の回転に
よって前記径か経時的に増加するため、カムフォロワア
ーム(+8)は復帰スプリング(13)の旧勢力に抗し
て反時計方向に揺動しているか、前記復動開始点間がカ
ムフォロワ(20)に位置するタイミングでアーム(1
8)の揺動幅か蒔人となり往動か終了する。さらに、カ
ム(19)が回転すると揺動幅が減少するにつれて復帰
スプリング(13)の復帰/・ネカが作用し、カムフォ
ロワアーム(18)が時刷方向に揺動することによって
第1及び第2移動体(2)、(5)か矢印(IS)方向
に復動する。
At the timing when the exposure scan is completed, the cam circumferential surface is the largest among the diameters from the rotation center (26) of the cam (19) to the cam circumferential surface, that is, between the backward movement start point or the cam merrow (
20). During forward movement, the diameter increases over time due to the rotation of the cam (+!l), so the cam follower arm (+8) swings counterclockwise against the old force of the return spring (13). The arm (1
8) The swing width becomes the sower and the forward movement ends. Furthermore, as the cam (19) rotates, the swing width decreases, and the return force of the return spring (13) acts, causing the cam follower arm (18) to swing in the clockwise direction, thereby causing the first and second The moving bodies (2) and (5) move back in the direction of the arrow (IS).

カムツメロワアーム(+8)は復帰スプリング(] +
3)の復帰バネ力によって時計方向の付勢力を受けてい
るた〆〕、カムフAロワ(20)がノノム(19)の周
面を押圧している訳であるが、この抑圧力のカム(19
)周面接線方向の分力がカム(+9)を反時d1方向に
回転させるように作用する。このため、カム(19)の
一回転速度が増速されると共に、モーター(M+)の回
転速10も増速される。
The Kamutsume lower arm (+8) has a return spring (] +
The cam holder A lower (20) presses the circumferential surface of the nom (19) while receiving a clockwise biasing force due to the return spring force of 3). 19
) A component force in the direction of the circumferential surface acts to rotate the cam (+9) counterclockwise in the d1 direction. Therefore, one rotational speed of the cam (19) is increased, and the rotational speed 10 of the motor (M+) is also increased.

このような増速か生ずると」−述の如く、光学系と感光
体トラム(21)との同期が取れなくなる為、カム(1
9)を以下に述へる形状に設定している。
If such speed increase occurs, as mentioned above, the optical system and the photoconductor tram (21) will no longer be synchronized, so the cam (1
9) is set to the shape described below.

第3図において、実線で示すカム(19)のカム形状は
本発明に基づいて形成されたものであり、点線で示すカ
ム(19’)のカム形状は、第4図ta+実線で示す理
想曲線(C)(理想の一往復動における時間と移動体の
変位計との関係を示す曲線)に基ついて形成されたもの
である。
In FIG. 3, the cam shape of the cam (19) shown by the solid line is formed based on the present invention, and the cam shape of the cam (19') shown by the dotted line is based on the ideal curve shown by the ta + solid line in FIG. (C) (a curve showing the relationship between the time in one ideal reciprocating motion and the displacement meter of the moving body).

カム(+9)はカム(19’)に比べて往動開始点(1
’o)から復動開始点(lりまでの往動回転角を小さく
設定しである。ここで、カム(19)とカム(19’)
の各各の往動回転角を(θ1)、(θ2)とすると、カ
ムの回転角と移動体の変位量との関係は第4図(1))
に示す曲線になる。ただし、往動時間は理想曲線、tc
lに従わなけれはならないため、往動開始点(PO)か
ら復動開始点ti’+まてのカム形状仕初は、カム(+
9)が角度(θ1)回転するのに要する時間をカム(+
!−+’)か角度(θ2)回転するのに要する時間と同
じになるように設定されている。
The cam (+9) has a forward movement starting point (1) compared to the cam (19').
The forward rotation angle from 'o) to the backward movement start point (l) is set small.Here, cam (19) and cam (19')
If the respective forward rotation angles are (θ1) and (θ2), the relationship between the rotation angle of the cam and the amount of displacement of the moving body is shown in Fig. 4 (1))
The curve becomes as shown in . However, the forward time is an ideal curve, tc
Therefore, the cam shape from the forward movement start point (PO) to the backward movement start point ti'+ is cam (+
9) The time required for the cam (+
! -+') or the time required to rotate by an angle (θ2).

次に復動時において、理想曲線+qに基つくカム。(+
9’)ででは第1図(I〕)で示したように、実際には
復帰スプリンタ(13)によってカムの回転速度か増速
されるため、復動時間か理想曲線+qで設定している復
動時間よりも早くなり、感光ドラム(21)との同期が
取れなくなってしまう。
Next, during double movement, the cam is based on the ideal curve +q. (+
9'), as shown in Figure 1 (I), the rotational speed of the cam is actually increased by the return splinter (13), so the return time is set using the ideal curve +q. The return movement time becomes faster than the normal return movement time, and it becomes impossible to synchronize with the photosensitive drum (21).

カム(19)は復動開始点(1’)から往動開始点(1
’o)までの回転角(θ1′)をカム(19’)の回転
角(θ2′)よりも大きくすることで、復帰スプリング
(13)による増速によって生ずる理想曲線tc+から
のズレを捕]1゛している。また、復動開始点(Piか
ら往動開始点(PO)までのカム形状は、増速による回
転速度の変動を吸収できる形状にしている。このような
形状のカム(19)では、復動時に復帰スプリング(1
3)が作用しない場合第4図(a)点線のような特性が
得られるが、復帰スプリング(J 3 )を作用させる
と理想曲線(C1に沿った特性が得られる。
The cam (19) moves from the backward movement start point (1') to the forward movement start point (1').
By making the rotation angle (θ1') up to 'o) larger than the rotation angle (θ2') of the cam (19'), the deviation from the ideal curve tc+ caused by the speed increase by the return spring (13) is captured] I'm doing 1. In addition, the cam shape from the backward movement start point (Pi to the forward movement start point (PO)) is designed to absorb fluctuations in rotational speed due to speed increase.The cam (19) with such a shape When the return spring (1
When 3) does not act, a characteristic as shown by the dotted line in FIG. 4(a) is obtained, but when the return spring (J 3 ) is applied, a characteristic along the ideal curve (C1) is obtained.

このように、カム(19)のカム形状を設定する際に、
理想曲線(C)に基ついたカム形状を有するカム(+9
’)の、理想曲線からのズレを考慮して設定しているた
め、光学系駆動用モーター(M+)の駆動トルクか小さ
いものであっても、復帰スプリンタ(13)によって生
ずるカム(19)の回転速度の増速を容易に吸収するこ
とかでき、理想曲線[C1に沿また往復動を行うことが
できる。従って、感光体ドラム(21)との同期が確実
に取れ、連続複写時においてもカム(19)を連続して
回転さすことができる。
In this way, when setting the cam shape of the cam (19),
A cam with a cam shape based on the ideal curve (C) (+9
') from the ideal curve, so even if the drive torque of the optical system drive motor (M+) is small, the cam (19) generated by the return splinter (13) It is possible to easily absorb the increase in the rotational speed of , and it is possible to perform reciprocating motion along the ideal curve [C1]. Therefore, synchronization with the photosensitive drum (21) can be ensured, and the cam (19) can be continuously rotated even during continuous copying.

また、増速を吸収することができるので、復動終丁時に
カム(19)の回転速度が異常に加速されて回転速度に
変動を生ずることがないため、移動体の露光走査が安定
する。
Furthermore, since the speed increase can be absorbed, the rotational speed of the cam (19) will not be abnormally accelerated at the end of the backward movement and the rotational speed will not fluctuate, so that the exposure scanning of the movable body is stabilized.

効    東 本発明に係わる光学系駆動装置においては、カムの形状
か付勢手段の旧勢力により生ずるカムの回転変動を吸収
できる形状とされているため、イ・1勢手段である復帰
スプリングの復帰バネ力によって、カム及び光学系駆動
用モーターの回転速度が増速されても、光学系と感光体
ドラムとの同期が確実に取ることができると共に、露光
走査に悪影響を及はすことがない。
EFFECTS: In the optical system drive device according to the present invention, the shape of the cam is such that it can absorb rotational fluctuations of the cam caused by the old force of the biasing means, so that the return spring, which is the A.1 force means, cannot be returned. Even if the rotational speed of the cam and optical system drive motor is increased by the spring force, synchronization between the optical system and the photoreceptor drum can be ensured, and exposure scanning will not be adversely affected. .

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

第1図[a+は従来の光学系駆動装置を示す図、第1図
tbl、tclは従来の不都合を示す図、第2図は本発
明を適用した光学系駆動装置の斜視図、第3図は本発明
を示す図、第4図(a)、(1〕)は本発明の特性を示
す図である。 (1)・・・光学系駆動装置 (2)第1移動体(5)
・・・第2移動体(1o)、 (11)、 (14)、
 (15)  ・プーリー(12)、(16)・・ワイ
ヤー (13)・・復帰スプリング(18)・・カムフ
ォロワアーム (19)・・カム(20)・・カムフメ
ロワ (Ml)・・光学系駆動用モーター
FIG. 1 [a+ is a diagram showing a conventional optical system drive device, FIG. 1 TBL and TCL are diagrams showing conventional disadvantages, FIG. 2 is a perspective view of an optical system drive device to which the present invention is applied, FIG. is a diagram showing the present invention, and FIG. 4(a), (1) is a diagram showing the characteristics of the present invention. (1)...Optical system drive device (2) First moving body (5)
...Second mobile body (1o), (11), (14),
(15) ・Pulley (12), (16)...Wire (13)...Return spring (18)...Cam follower arm (19)...Cam (20)...Cam follower arm (Ml)...For optical system drive motor

Claims (1)

【特許請求の範囲】[Claims] 1、複写原稿を走査すへく往復動する移動体と、駆動手
段からの駆動力を往復動に変えるカムと、該カムの往復
動を前記移動体に伝達する伝達手繰と、前記移動体の復
動方向に移動力を与えるためのイ・]勢手段とを備えた
光学系駆動装置において、前記カムは、復動の際前記付
勢手段の付勢力により生ずる前記カムの回転変動を吸収
できる形状とされていることを特徴とする光学系駆動装
置。
1. A movable body that reciprocates to scan a copy document; a cam that converts the driving force from the drive means into reciprocating motion; a transmission mechanism that transmits the reciprocating motion of the cam to the movable body; In the optical system drive device, the cam is capable of absorbing rotational fluctuations of the cam caused by the urging force of the urging means during the backward movement. An optical system drive device characterized by having a shape.
JP14278982A 1982-08-18 1982-08-18 Driving device of optical system Pending JPS5933444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14278982A JPS5933444A (en) 1982-08-18 1982-08-18 Driving device of optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14278982A JPS5933444A (en) 1982-08-18 1982-08-18 Driving device of optical system

Publications (1)

Publication Number Publication Date
JPS5933444A true JPS5933444A (en) 1984-02-23

Family

ID=15323639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14278982A Pending JPS5933444A (en) 1982-08-18 1982-08-18 Driving device of optical system

Country Status (1)

Country Link
JP (1) JPS5933444A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01254315A (en) * 1988-04-01 1989-10-11 Showa Alum Corp Die for manufacturing extrusion form having high fin or fin-like projecting part

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01254315A (en) * 1988-04-01 1989-10-11 Showa Alum Corp Die for manufacturing extrusion form having high fin or fin-like projecting part
JPH0367765B2 (en) * 1988-04-01 1991-10-24 Showa Aluminium Co Ltd

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