JPH0990516A - Image reader - Google Patents
Image readerInfo
- Publication number
- JPH0990516A JPH0990516A JP25152495A JP25152495A JPH0990516A JP H0990516 A JPH0990516 A JP H0990516A JP 25152495 A JP25152495 A JP 25152495A JP 25152495 A JP25152495 A JP 25152495A JP H0990516 A JPH0990516 A JP H0990516A
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- image reading
- scanner unit
- reflection mirror
- image
- 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
Links
Landscapes
- Optical Systems Of Projection Type Copiers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，原稿像を結像光学
系により感光体に投影露光するアナログ光学系を備えた
画像読取装置に係り，特に，結像光学系のスキャナユニ
ット，反射手段等が備える反射ミラーを軽量化して該ス
キャナユニット等を軽量化すると共に，低コスト化を図
った画像読取装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus provided with an analog optical system for projecting and exposing a document image on a photoconductor by means of an image forming optical system, and more particularly to a scanner unit of the image forming optical system, reflecting means and the like. The present invention relates to an image reading apparatus that reduces the cost of the scanner unit and the like by reducing the weight of the reflection mirror included in the scanner unit.
【０００２】[0002]
【従来の技術】従来の複写機等の画像読取装置では，原
稿を露光走査する第１スキャナユニット及び第２スキャ
ナユニットやその他の反射手段において，反射ミラーの
保持体としては，一般に，ＳＥＣＣ等の薄板材またはモ
ールドを使用したものがよく知られている。即ち，保持
体を安価で実現し，且つ保持体の軽量化を図ったもので
ある。2. Description of the Related Art In a conventional image reading apparatus such as a copying machine, in the first scanner unit and the second scanner unit for exposing and scanning an original and other reflecting means, a holding member for a reflecting mirror is generally a SECC or the like. Those using a thin plate material or a mold are well known. That is, the holding body is realized at low cost and the weight of the holding body is reduced.
【０００３】一方，従来の反射ミラー自体としては，５
［ｍｍ］程度の厚みを持ったガラス板の表面にアルミ蒸
着処理を施したものを使用しており，その形状は長方形
である。尚，画像読取装置においては，原稿面と感光体
に近い位置に設置される反射ミラーは，原稿の幅とほぼ
等しい横幅を必要とし，レンズの近傍に配置される反射
ミラーはレンズ径に近い横幅を必要とする。On the other hand, as a conventional reflection mirror itself,
A glass plate having a thickness of about [mm], which has been subjected to aluminum vapor deposition treatment, is used, and its shape is rectangular. In the image reading apparatus, the reflection mirror installed near the surface of the original and the photoconductor needs a width approximately equal to the width of the original, and the reflection mirror arranged near the lens has a width close to the lens diameter. Need.
【０００４】図７は，従来の画像読取装置における第２
スキャナユニットの反射ミラーの取付構造を説明する図
である。第２スキャナフレーム７２３に組み込まれてい
る板ばね７２４を第２ミラー７２１の反射面の反対側に
当て，板ばね７２４の弾性力によって第２ミラー７２１
を固定する構造である。FIG. 7 shows a second example of the conventional image reading apparatus.
It is a figure explaining the attachment structure of the reflection mirror of a scanner unit. The leaf spring 724 incorporated in the second scanner frame 723 is applied to the opposite side of the reflection surface of the second mirror 721, and the elastic force of the leaf spring 724 causes the second mirror 721 to move.
Is a structure for fixing.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら，上記従
来の画像読取装置にあっては，ガラス板の表面にアルミ
蒸着処理を施したものを反射ミラーとして使用してお
り，このような反射ミラーを結像光学系のスキャナユニ
ット，反射手段等に組み込んだのでは，ユニットまたは
反射手段の重量が大幅に増加してしまうという問題点が
あった。However, in the above-mentioned conventional image reading apparatus, a glass plate whose surface is subjected to aluminum vapor deposition is used as a reflection mirror, and such a reflection mirror is connected. If it is incorporated in the scanner unit, the reflecting means, etc. of the image optical system, there is a problem that the weight of the unit or the reflecting means is significantly increased.
【０００６】特に，第１スキャナユニット及び第２スキ
ャナユニットは往復走査するために，高速性能が要求さ
れる機器になればなるほど，加減速時に大きな駆動力が
必要となり，本来，ユニット重量を極力低減させること
が大きな課題となっており，反射ミラーの重量の増大は
致命的な問題となっていた。In particular, since the first scanner unit and the second scanner unit perform reciprocating scanning, the higher the speed of the equipment, the greater the driving force required during acceleration and deceleration, and the unit weight should be reduced as much as possible. This is a major issue, and increasing the weight of the reflection mirror has been a fatal problem.
【０００７】本発明は，上記従来の問題点に鑑みてなさ
れたものであって，結像光学系のスキャナユニット，反
射手段等が備える反射ミラーを軽量化して，該スキャナ
ユニット等を軽量化すると共に，低コスト化を図った画
像読取装置を提供することを目的としている。The present invention has been made in view of the above conventional problems, and reduces the weight of the scanner unit of the imaging optical system, the reflection mirror provided in the reflecting means, and the like, thereby reducing the weight of the scanner unit and the like. At the same time, it is an object of the present invention to provide an image reading device that is low in cost.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に，本発明の請求項１に係る画像読取装置は，原稿像を
結像光学系により感光体に投影露光する画像読取装置に
おいて，前記結像光学系が備える反射ミラーは，反射表
面が鏡面光沢の薄板鋼板材で長尺に形成され，断面形状
がコの字形である。In order to solve the above-mentioned problems, an image reading apparatus according to claim 1 of the present invention is an image reading apparatus for projecting and exposing a document image on a photoconductor by an image-forming optical system. The reflecting mirror of the image-forming optical system has a long reflecting surface formed of a thin steel plate material having a mirror gloss, and has a U-shaped cross section.
【０００９】また，請求項２に係る画像読取装置は，原
稿を第１スキャナユニット及び第２スキャナユニットで
露光走査し，レンズに導いた光を別の反射手段により折
り返して感光体に結像させる画像読取装置において，前
記第１スキャナユニット，前記第２スキャナユニット及
びまたは前記反射手段が備える反射ミラーは，反射表面
が鏡面光沢の薄板鋼板材で長尺に形成され，断面形状が
コの字形である。In the image reading apparatus according to the second aspect, the original is exposed and scanned by the first scanner unit and the second scanner unit, and the light guided to the lens is reflected by another reflecting means to form an image on the photoconductor. In the image reading device, the reflection mirror included in the first scanner unit, the second scanner unit, and / or the reflection means is formed in a long shape by a thin steel plate material having a specular gloss and has a U-shaped cross section. is there.
【００１０】また，請求項３に係る画像読取装置は，請
求項１または２記載の画像読取装置において，前記反射
ミラーは，長手方向の端部に，当該反射ミラーを保持す
る保持手段と係止するための形状を備えた係止部を具備
するものである。An image reading apparatus according to a third aspect of the present invention is the image reading apparatus according to the first or second aspect, wherein the reflecting mirror is locked at its longitudinal end portion with a holding means for holding the reflecting mirror. It is provided with a locking portion having a shape for
【００１１】また，請求項４に係る画像読取装置は，請
求項１，２または３記載の画像読取装置において，前記
反射ミラーは，短手方向のミラー幅が，当該反射ミラー
の中央部と端部とで異なる形状を備えるものである。An image reading apparatus according to a fourth aspect is the image reading apparatus according to the first, second or third aspect, wherein the reflecting mirror has a mirror width in a lateral direction such that a center portion and an end portion of the reflecting mirror. The parts have different shapes.
【００１２】また，請求項５に係る画像読取装置は，請
求項１，２，３または４記載の画像読取装置において，
前記反射ミラーの材質は，アルミニウムまたはアルミニ
ウム合金である。An image reading device according to claim 5 is the image reading device according to claim 1, 2, 3 or 4.
The material of the reflection mirror is aluminum or aluminum alloy.
【００１３】[0013]
【発明の実施の形態】以下，本発明の画像読取装置の概
要について，並びに，本発明の画像読取装置の一実施例
について，図面を参照して詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an outline of an image reading apparatus of the present invention and an embodiment of the image reading apparatus of the present invention will be described in detail with reference to the drawings.
【００１４】〔本発明の画像読取装置の概要〕本発明の
請求項１に係る画像読取装置では，図１及び図２に示す
如く，原稿像を結像光学系により感光体に投影露光する
画像読取装置において，結像光学系が備える反射ミラー
１２１等を，反射表面が鏡面光沢の薄板鋼板材で長尺に
形成し，該反射ミラー１２１等の断面形状がコの字形と
なるように形成している。このように，反射ミラー１２
１等の断面形状をコの字形とすることで，薄板鋼板材の
平面度を出すことができ，且つ強度を確保できる。[Outline of Image Reading Apparatus of the Present Invention] In the image reading apparatus according to the first aspect of the present invention, as shown in FIGS. 1 and 2, an image in which a document image is projected and exposed on a photoconductor by an image forming optical system. In the reading device, the reflection mirror 121 and the like included in the image forming optical system is formed in a long shape by a thin steel plate material having a reflection surface and has a specular gloss, and the reflection mirror 121 and the like are formed so that the cross-sectional shape thereof is a U-shape. ing. In this way, the reflection mirror 12
By making the cross-sectional shape of 1 etc. U-shaped, the flatness of the thin steel plate material can be obtained and the strength can be secured.
【００１５】また，請求項２に係る画像読取装置では，
図１及び図２に示す如く，原稿を第１スキャナユニット
１０１及び第２スキャナユニット１０２で露光走査し，
レンズ１０３に導いた光を別の反射手段１０４により折
り返して感光体１０６に結像させる画像読取装置におい
て，第１スキャナユニット１０１，第２スキャナユニッ
ト１０２及びまたは反射手段１０４等が備える反射ミラ
ー１２１等を，反射表面が鏡面光沢の薄板鋼板材で長尺
に形成し，該反射ミラー１２１等の断面形状がコの字形
となるように形成している。In the image reading device according to the second aspect,
As shown in FIGS. 1 and 2, the original is exposed and scanned by the first scanner unit 101 and the second scanner unit 102,
In the image reading apparatus that folds the light guided to the lens 103 by another reflecting means 104 and forms an image on the photoconductor 106, the first scanner unit 101, the second scanner unit 102, and / or the reflecting mirror 121 provided in the reflecting means 104 and the like. Is formed in a long shape by a thin steel plate material having a specular gloss, and the cross-sectional shape of the reflection mirror 121 and the like is U-shaped.
【００１６】このように，反射ミラー１２１等の断面形
状をコの字形とすることで，薄板鋼板材の平面度を出す
ことができ，且つ強度を確保できる。また，立ち曲げ量
を調整することにより，反射ミラー１２１等の固有振動
数を変化させ，スキャナモータの振動による反射ミラー
１２１等の共振を回避することも可能である。As described above, by making the cross-sectional shape of the reflecting mirror 121 etc. U-shaped, the flatness of the thin steel plate material can be obtained and the strength can be secured. In addition, by adjusting the amount of vertical bending, it is possible to change the natural frequency of the reflection mirror 121 and the like and avoid resonance of the reflection mirror 121 and the like due to the vibration of the scanner motor.
【００１７】また，請求項３に係る画像読取装置では，
図３及び図６に示す如く，反射ミラー１２１等を保持す
る保持手段６２３と係止するために，反射ミラー１２１
等の長手方向の端部に，所定の形状を備えた係止部を具
備している。これにより，従来のような板ばねの弾性力
で固定する方法と比較して，板ばねを不要とすることが
でき，また反射ミラー１２１等が組み込まれる第２スキ
ャナユニット１０２等の組み付け作業を自動化すること
が可能となる。Further, in the image reading apparatus according to claim 3,
As shown in FIGS. 3 and 6, in order to engage with the holding means 623 that holds the reflection mirror 121 and the like, the reflection mirror 121
Etc., the end portions in the longitudinal direction are provided with locking portions having a predetermined shape. As a result, compared to the conventional method of fixing with the elastic force of the leaf spring, the leaf spring can be eliminated, and the assembling work of the second scanner unit 102 etc. in which the reflection mirror 121 etc. is incorporated is automated. It becomes possible to do.
【００１８】また，請求項４に係る画像読取装置では，
図４に示す如く，反射ミラー１２１等の短手方向のミラ
ー幅を，当該反射ミラー１２１等の中央部と端部とで異
なるように形成している。これにより，レンズ１０３の
特性であるｃｏｓ４乗則による周辺光量低下の補正を行
うことができる。Further, in the image reading apparatus according to claim 4,
As shown in FIG. 4, the widths of the reflecting mirror 121 and the like in the lateral direction are formed so that the central portion and the end portion of the reflecting mirror 121 and the like are different. As a result, it is possible to correct the decrease in the peripheral light amount according to the cos 4 power law, which is a characteristic of the lens 103.
【００１９】また，請求項５に係る画像読取装置では，
反射ミラー１２１等の材質をアルミニウムまたはアルミ
ニウム合金としており，これにより，当該反射ミラー１
２１等が組み込まれるスキャナユニット等の軽量化を図
ることができ，走査往復のための駆動用スキャナモータ
の小型化が図れ，結果として画像読取装置の大幅なコス
トダウンを図ることが可能となる。Further, in the image reading apparatus according to claim 5,
The material of the reflection mirror 121 and the like is aluminum or aluminum alloy, which allows the reflection mirror 1
It is possible to reduce the weight of the scanner unit in which 21 and the like are incorporated, to reduce the size of the driving scanner motor for reciprocating the scanning, and as a result, to significantly reduce the cost of the image reading apparatus.
【００２０】〔実施例〕図１は本発明の一実施例に係る
画像読取装置の構成図である。尚，本実施例は本発明の
画像読取装置を複写機に適用したものであり，６枚の反
射ミラーを備えた構成である。[Embodiment] FIG. 1 is a block diagram of an image reading apparatus according to an embodiment of the present invention. In this embodiment, the image reading apparatus of the present invention is applied to a copying machine, which has a structure including six reflecting mirrors.
【００２１】同図において，本実施例の画像読取装置
は，第１スキャナユニット１０１，第２スキャナユニッ
ト１０２，レンズ１０３，第３キャリッジ１０４，第６
ミラー１０５及び感光体１０６を備えて構成されてい
る。また，第１スキャナユニット１０１には，露光ラン
プ１１１，リフレクタ１１２及び第１ミラー１１３を，
第２スキャナユニット１０２には，第２ミラー１２１及
び第３ミラー１２２を，更に第３キャリッジ１０４に
は，第４ミラー１４１及び第５ミラー１４２を，それぞ
れ備えている。In the figure, the image reading apparatus of the present embodiment comprises a first scanner unit 101, a second scanner unit 102, a lens 103, a third carriage 104, and a sixth scanner unit.
The mirror 105 and the photoconductor 106 are provided. Further, the first scanner unit 101 includes an exposure lamp 111, a reflector 112, and a first mirror 113,
The second scanner unit 102 includes a second mirror 121 and a third mirror 122, and the third carriage 104 includes a fourth mirror 141 and a fifth mirror 142.
【００２２】本実施例の画像読取装置では，原稿載置台
に置かれた原稿を第１スキャナユニット１０１及び第２
スキャナユニット１０２で露光走査し，レンズ１０３に
導いた光を第３キャリッジ１０４及び第６ミラー１０６
により折り返して感光体１０６に結像させている。In the image reading apparatus of the present embodiment, the original placed on the original placing table is read by the first scanner unit 101 and the second original.
The light scanned by the scanner unit 102 and guided to the lens 103 receives the light, and the third carriage 104 and the sixth mirror 106
The image is folded back to form an image on the photoconductor 106.
【００２３】第１スキャナユニット１０１が備える第１
ミラー１１３，第２スキャナユニット１０２が備える第
２ミラー１２１及び第３ミラー１２２，第３キャリッジ
１０４が備える第４ミラー１４１及び第５ミラー１４
２，並びに，第６ミラー１０５（以下，反射ミラー１２
１等という）は，基本的に，図２の平面図及び断面図に
示すように，反射表面である鏡面２０１が高光沢の薄板
鋼板材で長尺に形成され，該反射ミラー１２１等の断面
形状がコの字形となるよう形成されている。尚，鏡面２
０１は，表面光沢のない鋼板材に光沢のあるシールを貼
り付けて形成しても良い。The first scanner unit 101 has a first
The mirror 113, the second mirror 121 and the third mirror 122 included in the second scanner unit 102, the fourth mirror 141 and the fifth mirror 14 included in the third carriage 104.
2, and the sixth mirror 105 (hereinafter, the reflection mirror 12
Basically, as shown in the plan view and the cross-sectional view of FIG. 2, the mirror surface 201, which is a reflection surface, is basically formed by a long sheet of high-gloss thin steel plate material, and the cross section of the reflection mirror 121, etc. It is formed to have a U-shape. In addition, mirror surface 2
01 may be formed by attaching a glossy seal to a steel plate material having no surface gloss.
【００２４】このように，反射ミラー１２１等の断面形
状をコの字形とすることで，薄板鋼板材の平面度を出す
ことができ，且つ強度を確保することができる。また，
立ち曲げ量を調整することにより，反射ミラー１２１等
の固有振動数を変化させることができるため，第１スキ
ャナユニット１０１及び第２スキャナユニット１０２を
往復走査するための駆動用スキャナモータの振動から，
反射ミラー１２１等が共振する現象を回避することも可
能である。By thus forming the reflection mirror 121 and the like in a U-shaped cross-section, the flatness of the thin steel plate material can be obtained and the strength can be secured. Also,
Since the natural frequency of the reflection mirror 121 and the like can be changed by adjusting the amount of vertical bending, from the vibration of the driving scanner motor for reciprocating the first scanner unit 101 and the second scanner unit 102,
It is also possible to avoid the phenomenon that the reflection mirror 121 and the like resonate.
【００２５】また，反射ミラー１２１等の形状は，図３
の平面図及び断面図に示すように，反射ミラー１２１等
を保持する手段と係止させるために，反射ミラー１２１
等の長手方向の端部に，突起形状を備えた係止部を備え
て形成しても良い。即ち，スキャナフレーム等のミラー
保持体に設けた取付孔に，該係止部を挿入した後に変形
させて，反射ミラー１２１等を固定できるようにしたも
のである。The shape of the reflection mirror 121 and the like is shown in FIG.
As shown in the plan view and the cross-sectional view of FIG.
It is also possible to form an engaging portion having a protrusion shape at the end portion in the longitudinal direction such as. That is, the reflection mirror 121 and the like can be fixed by inserting the locking portion into a mounting hole provided in a mirror holder such as a scanner frame and then deforming the locking portion.
【００２６】図６は，本実施例の第２スキャナユニット
１０２の斜視図である。第２スキャナフレーム６２３の
取付孔に係止部を挿入した後に該係止部を変形して，第
２ミラー１２１及び第３ミラー１２２が第２スキャナフ
レーム６２３に勘合されている状態を示している。従来
のような板ばね７２４の弾性力で固定する方法（図７参
照）と比較して，本実施例の取付構造によれば板ばね７
２４を不要とすることができ，また反射ミラー１２１等
が組み込まれる第２スキャナユニット１０２等の組み付
け作業を自動化することが可能となるという効果も奏す
る。FIG. 6 is a perspective view of the second scanner unit 102 of this embodiment. The state where the locking portion is deformed after the locking portion is inserted into the mounting hole of the second scanner frame 623 and the second mirror 121 and the third mirror 122 are fitted to the second scanner frame 623 is shown. . Compared to the conventional method of fixing the leaf spring 724 with the elastic force (see FIG. 7), according to the mounting structure of this embodiment, the leaf spring 7 is
It is possible to eliminate the need for 24, and it is also possible to automate the assembling work of the second scanner unit 102 and the like in which the reflection mirror 121 and the like are incorporated.
【００２７】次に，レンズ１０３の特性として，図５に
示すように，レンズ１０３を通過した光量がｃｏｓ４乗
則に従い，周辺光量が低下することが知られている。従
来は，このような周辺光量の低下を補正するために，例
えば，第１スキャナユニットに設けられるスリット規制
部材の端部開口を中央部開口よりも広げて形成すること
により対処していた。Next, as a characteristic of the lens 103, as shown in FIG. 5, it is known that the amount of light passing through the lens 103 is reduced in peripheral light amount according to the cos 4 power law. Conventionally, in order to correct such a decrease in the peripheral light amount, for example, the slit opening of the slit regulating member provided in the first scanner unit is formed wider than the central opening.
【００２８】本実施例では，このようなｃｏｓ４乗則に
よるレンズ１０３の周辺光量低下の補正を第１ミラー１
１３，第２ミラー１２１，第３ミラー１２２等の形状を
工夫することで対処している。即ち，図４の平面図及び
断面図に示すように，反射ミラー１２１等の短手方向の
ミラー幅を，中央部と端部とで異なるように形成して，
画像周辺部の反射光を増加させて周辺光量低下の補正を
行うべく，周辺部分の反射面積を増やした構造としてい
る。このように，従来のガラスミラーでは実施できなか
った形状を，本実施例の薄板鋼板材による反射ミラーで
は実現することができる。In the present embodiment, the first mirror 1 corrects the reduction of the peripheral light amount of the lens 103 by such a cos fourth power law.
This is dealt with by devising the shapes of 13, the second mirror 121, the third mirror 122, and the like. That is, as shown in the plan view and the cross-sectional view of FIG. 4, the mirror widths in the lateral direction of the reflection mirror 121 and the like are formed so as to be different between the central portion and the end portion,
The structure is such that the reflection area of the peripheral portion is increased in order to correct the reduction of the peripheral light amount by increasing the reflected light of the peripheral portion of the image. As described above, a shape that cannot be realized by the conventional glass mirror can be realized by the reflecting mirror made of the thin steel plate material of this embodiment.
【００２９】更に，以上説明した画像読取装置における
反射ミラー１２１等の材質としては，アルミニウムまた
はアルミニウム合金を使用するのが望ましい。例えば，
高光沢アルミニウム板を使用すれば，当該反射ミラー１
２１等が組み込まれるスキャナユニット等の軽量化を図
ることができ，走査往復のための駆動用スキャナモータ
の小型化が図れ，結果として画像読取装置の大幅なコス
トダウンを図ることが可能となる。Furthermore, it is desirable to use aluminum or aluminum alloy as the material of the reflecting mirror 121 and the like in the image reading apparatus described above. For example,
If a high-gloss aluminum plate is used, the reflection mirror 1
It is possible to reduce the weight of the scanner unit in which 21 and the like are incorporated, to reduce the size of the driving scanner motor for reciprocating the scanning, and as a result, to significantly reduce the cost of the image reading apparatus.
【００３０】[0030]
【発明の効果】以上説明したように，本発明の請求項１
に係る画像読取装置によれば，結像光学系が備える反射
ミラーを，反射表面が鏡面光沢の薄板鋼板材で長尺に形
成し，該反射ミラーの断面形状をコの字形となるよう形
成したので，薄板鋼板材の平面度を出すことができ，且
つ強度を確保し得る画像読取装置を提供することができ
る。As described above, according to the first aspect of the present invention,
According to the image reading device of the present invention, the reflecting mirror provided in the image forming optical system is formed of a long thin plate steel sheet having a mirror-finished reflecting surface, and the reflecting mirror has a U-shaped cross section. Therefore, it is possible to provide an image reading apparatus which can obtain the flatness of the thin steel plate material and can secure the strength.
【００３１】また，請求項２に係る画像読取装置によれ
ば，第１スキャナユニット，第２スキャナユニット及び
または反射手段等が備える反射ミラーを，反射表面が鏡
面光沢の薄板鋼板材で長尺に形成し，該反射ミラーの断
面形状をコの字形となるよう形成したので，薄板鋼板材
の平面度を出すことができ，且つ強度を確保でき，ま
た，立ち曲げ量を調整することにより反射ミラーの固有
振動数を変化させ，スキャナモータの振動による反射ミ
ラーの共振を回避することも可能な画像読取装置を提供
することができる。Further, according to the image reading apparatus of the second aspect, the reflection mirror provided in the first scanner unit, the second scanner unit, and / or the reflection means is made of a thin steel plate material having a mirror-finished reflection surface to be long. Since the reflecting mirror is formed so as to have a U-shaped cross-section, the flatness of the thin steel plate material can be obtained, strength can be secured, and the reflecting mirror can be adjusted by adjusting the amount of standing bending. It is possible to provide an image reading apparatus that can avoid the resonance of the reflecting mirror due to the vibration of the scanner motor by changing the natural frequency of the image.
【００３２】また，請求項３に係る画像読取装置によれ
ば，反射ミラーを保持する保持手段と係止するため，反
射ミラーの長手方向の端部に所定の形状を備えた係止部
を備えることとしたので，板ばねが不要となり，当該反
射ミラーが組み込まれるスキャナユニット等の組み付け
作業を自動化し得る画像読取装置を提供することができ
る。Further, according to the image reading apparatus of the third aspect, in order to engage with the holding means for holding the reflecting mirror, the end portion in the longitudinal direction of the reflecting mirror is provided with the engaging portion having a predetermined shape. Therefore, it is possible to provide an image reading device that does not require a leaf spring and can automate the assembling work of a scanner unit or the like in which the reflecting mirror is incorporated.
【００３３】また，請求項４に係る画像読取装置によれ
ば，反射ミラーの短手方向のミラー幅を当該反射ミラー
の中央部と端部とで異なるように形成したので，レンズ
の特性であるｃｏｓ４乗則による周辺光量低下の補正を
反射ミラーの形状によって行い得る画像読取装置を提供
することができる。Further, according to the image reading apparatus of the fourth aspect, the mirror width in the lateral direction of the reflecting mirror is formed so as to be different between the central portion and the end portion of the reflecting mirror, which is a characteristic of the lens. It is possible to provide an image reading apparatus that can correct the reduction in the amount of peripheral light by the cos fourth law by using the shape of the reflection mirror.
【００３４】また，請求項５に係る画像読取装置によれ
ば，反射ミラーの材質をアルミニウムまたはアルミニウ
ム合金としたので，当該反射ミラーが組み込まれるスキ
ャナユニット等の軽量化を図ることができ，走査往復の
ための駆動用スキャナモータの小型化が図れ，結果とし
て，大幅なコストダウンを図り得る画像読取装置を提供
することができる。Further, according to the image reading apparatus of the fifth aspect, since the material of the reflecting mirror is aluminum or aluminum alloy, the weight of the scanner unit or the like in which the reflecting mirror is incorporated can be reduced, and the scanning reciprocation is performed. Therefore, it is possible to reduce the size of the driving scanner motor, and as a result, it is possible to provide an image reading apparatus capable of significantly reducing the cost.
【図１】本発明の一実施例に係る画像読取装置の構成図
である。FIG. 1 is a configuration diagram of an image reading apparatus according to an embodiment of the present invention.
【図２】実施例の反射ミラーの基本的な構造を示す平面
図及び断面図である。2A and 2B are a plan view and a cross-sectional view showing a basic structure of a reflection mirror of an example.
【図３】実施例の係止部を備えた反射ミラーの構造を示
す平面図及び断面図である。3A and 3B are a plan view and a cross-sectional view showing a structure of a reflection mirror including a locking portion according to an embodiment.
【図４】実施例の周辺光量低下補正用の反射ミラーの構
造を示す平面図及び断面図である。4A and 4B are a plan view and a cross-sectional view showing a structure of a reflection mirror for correcting a reduction in peripheral light amount according to an example.
【図５】レンズのｃｏｓ４乗則に従う周辺光量低下の特
性を説明する説明図である。FIG. 5 is an explanatory diagram illustrating a characteristic of a peripheral light amount reduction according to a cos 4 power law of a lens.
【図６】図３に示す構造の反射ミラーを用いた第２スキ
ャナユニットの斜視図である。6 is a perspective view of a second scanner unit using a reflection mirror having the structure shown in FIG.
【図７】従来の画像読取装置における第２スキャナユニ
ットの反射ミラーの取付構造を説明する説明図である。FIG. 7 is an explanatory diagram illustrating a mounting structure of a reflection mirror of a second scanner unit in a conventional image reading device.
１０１ 第１スキャナユニット １０２ 第２スキャナユニット １０３ レンズ １０４ 第３キャリッジ（反射手段） １０５ 第６ミラー １０６ 感光体 １１１ 露光ランプ １１２ リフレクタ １１３ 第１ミラー １２１ 第２ミラー １２２ 第３ミラー １４１ 第４ミラー １４２ 第５ミラー ２０１，３０１，４０１ 鏡面 ５０６ ドラム面 ６２３ 第２スキャナフレーム 101 First Scanner Unit 102 Second Scanner Unit 103 Lens 104 Third Carriage (Reflecting Means) 105 Sixth Mirror 106 Photoconductor 111 Exposure Lamp 112 Reflector 113 First Mirror 121 Second Mirror 122 Third Mirror 141 Fourth Mirror 142 Second 5 mirror 201,301,401 mirror surface 506 drum surface 623 second scanner frame
Claims (5)
露光する画像読取装置において，前記結像光学系が備え
る反射ミラーは，反射表面が鏡面光沢の薄板鋼板材で長
尺に形成され，断面形状がコの字形であることを特徴と
する画像読取装置。1. In an image reading apparatus for projecting and exposing a document image on a photoconductor by an image forming optical system, a reflecting mirror included in the image forming optical system is formed of a long thin steel plate material having a specular glossy reflection surface. , An image reading device having a U-shaped cross section.
キャナユニットで露光走査し，レンズに導いた光を別の
反射手段により折り返して感光体に結像させる画像読取
装置において，前記第１スキャナユニット，前記第２ス
キャナユニット及びまたは前記反射手段が備える反射ミ
ラーは，反射表面が鏡面光沢の薄板鋼板材で長尺に形成
され，断面形状がコの字形であることを特徴とする画像
読取装置。2. An image reading apparatus in which an original is exposed and scanned by a first scanner unit and a second scanner unit, and light guided to a lens is reflected by another reflecting means to form an image on a photosensitive member. The image reading apparatus is characterized in that the reflection mirror provided in the second scanner unit and / or the reflection unit is formed in a long shape by a thin plate steel material having a mirror gloss and has a U-shaped cross section.
当該反射ミラーを保持する保持手段と係止するための形
状を備えた係止部を具備することを特徴とする請求項１
または２に記載の画像読取装置。3. The reflection mirror has a longitudinal end portion,
The locking part having a shape for locking with a holding means for holding the reflection mirror is provided.
Alternatively, the image reading device described in 2.
が，当該反射ミラーの中央部と端部とで異なる形状を備
えることを特徴とする請求項１，２または３に記載の画
像読取装置。4. The image reading device according to claim 1, wherein the reflection mirror has a shape in which the width of the mirror in the lateral direction is different between the central portion and the end portion of the reflection mirror. apparatus.
またはアルミニウム合金であることを特徴とする請求項
１，２，３または４に記載の画像読取装置。5. The image reading apparatus according to claim 1, 2, 3, or 4, wherein the material of the reflection mirror is aluminum or aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25152495A JPH0990516A (en) | 1995-09-28 | 1995-09-28 | Image reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25152495A JPH0990516A (en) | 1995-09-28 | 1995-09-28 | Image reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0990516A true JPH0990516A (en) | 1997-04-04 |
Family
ID=17224098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25152495A Pending JPH0990516A (en) | 1995-09-28 | 1995-09-28 | Image reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0990516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7887172B2 (en) | 2006-12-28 | 2011-02-15 | Brother Kogyo Kabushiki Kaisha | Liquid container |
-
1995
- 1995-09-28 JP JP25152495A patent/JPH0990516A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7887172B2 (en) | 2006-12-28 | 2011-02-15 | Brother Kogyo Kabushiki Kaisha | Liquid container |
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