JP3470040B2 - Color image forming equipment - Google Patents

Color image forming equipment

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Publication number
JP3470040B2
JP3470040B2 JP11545898A JP11545898A JP3470040B2 JP 3470040 B2 JP3470040 B2 JP 3470040B2 JP 11545898 A JP11545898 A JP 11545898A JP 11545898 A JP11545898 A JP 11545898A JP 3470040 B2 JP3470040 B2 JP 3470040B2
Authority
JP
Japan
Prior art keywords
image carrier
scanning
optical scanning
light beam
optical
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 - Fee Related
Application number
JP11545898A
Other languages
Japanese (ja)
Other versions
JPH11301023A (en
Inventor
浩人 近藤
裕昭 直川
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.)
Kyocera Corp
Original Assignee
Kyocera Corp
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 Kyocera Corp filed Critical Kyocera Corp
Priority to JP11545898A priority Critical patent/JP3470040B2/en
Publication of JPH11301023A publication Critical patent/JPH11301023A/en
Application granted granted Critical
Publication of JP3470040B2 publication Critical patent/JP3470040B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、レ−ザビ−ムプリ
ンタやデジタル制御複写機の露光装置として使用される
二つの光走査装置を備えたカラー画像形成装置に関し、
特に回転多面鏡の精度誤差、回転変動等による色ズレを
防止したカラー画像形成装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image forming apparatus having two optical scanning devices used as an exposure device of a laser beam printer or a digital control copying machine,
In particular, the present invention relates to a color image forming apparatus that prevents color misregistration due to accuracy error, rotational fluctuation, etc. of a rotary polygon mirror.

【0002】[0002]

【従来の技術】従来より、オフィスや家庭における印刷
処理には印刷スピードの高速化のものが要求され続けて
いるが、近年は、白黒画像に加え、カラー画像もこの高
速化が要求されてきている。しかしながら、従来のモノ
クロの印刷機は、黒色を出力すれば良かったのに比し、
カラーの印刷機は多くの色を何度か出力して重ね合わせ
る必要があることから印刷時間が長いため、高速化の要
求が大きかった。
2. Description of the Related Art Conventionally, high-speed printing has been required for printing in offices and homes, but in recent years, high-speed printing has been required for color images in addition to black-and-white images. There is. However, in comparison with the conventional monochrome printing machine that should output black,
Since a color printing machine needs to output many colors several times and superimpose them on one another, the printing time is long, and thus there has been a great demand for speeding up.

【0003】[0003]

【発明が解決しようとする課題】一般的にデジタルコピ
ー機や、レーザープリンタなどにおいて、印刷時間を短
縮するためには光走査装置に設置したポリゴンミラーの
回転速度を上げることで対応しているものが存在する。
しかしながら、すでに従来からポリゴンミラーのモータ
の回転速度は2000rpm〜20000rpmの高速
回転が普通であるため、さらなる高速化を実現するため
には、モータが大型になるとともに、振動対策などのた
め、組立精度も向上させなければならず、製造の歩留ま
りが悪く、非常に高価なものになっていた。
Generally, in a digital copying machine, a laser printer or the like, in order to shorten the printing time, it is possible to increase the rotation speed of a polygon mirror installed in an optical scanning device. Exists.
However, since the rotation speed of the polygon mirror motor has conventionally been usually high at 2000 rpm to 20000 rpm, in order to achieve further speed increase, the motor becomes large and assembling accuracy is taken as a countermeasure against vibration. Also had to be improved, the production yield was low, and it was very expensive.

【0004】従って、カラー画像を形成するにあたっ
て、ポリゴンミラーの回転速度を上げることなく、二つ
の光走査装置を用いて、感光体の異なる位置に照射し
て、二種の潜像及び異なる色のトナー像を形成させて中
間転写体で色重ねをするか、二つの光走査装置が異なる
時間で感光体上の同一の位置に照射して異なる色のトナ
ー像を重ねるようにすることで、実質的な印字速度をア
ップさせる技術は存在する。 しかし、この場合、二つ
の光ビームの走査位置がずれると画像がにじんだり、色
目がずれたりするので光ビームの走査位置がすれない工
夫が必要である。この様な問題は単一色においてはあま
り問題とならなかったが、色重ねを行うカラー画像を形
成するにあたっては大きな問題となる。
Therefore, in forming a color image, the two optical scanning devices are used to irradiate different positions on the photoconductor without increasing the rotation speed of the polygon mirror so that two types of latent images and different colors are formed. By forming a toner image and superimposing colors on the intermediate transfer member, or by irradiating two optical scanning devices at the same position on the photoconductor at different times to superimpose toner images of different colors, There is a technique for increasing the effective printing speed. However, in this case, if the scanning positions of the two light beams are deviated, the image may be blurred or the colors may be deviated, so that it is necessary to devise a method in which the scanning positions of the light beams are not moved. Although such a problem was not so serious in a single color, it becomes a serious problem in forming a color image in which color superposition is performed.

【0005】色ズレの原因は多くあるが、特に頻繁に起
こる色ズレの原因は、上述のポリゴンミラーの回転変動
に起因するズレである。図2は、単色レーザプリンタで
縦線を描画したときの概念図である。図の左から右へ光
走査装置が走査するものとし、左側が走査上流側であ
り、右側が走査下流側である(以下、他の図の説明も同
じ)。図は用紙の縦方向(走査方向に垂直方向)に直線
を描くようにした図であり、ポリゴンミラーの精度誤
差,回転変動等によって、走査開始位置から走査するに
したがって微妙にズレ始め、そのズレ量の積み重ねによ
って、走査下流側では大きなズレが生じる。
Although there are many causes of color misregistration, the most frequent cause of color misregistration is the above-mentioned misregistration due to the rotational fluctuation of the polygon mirror. FIG. 2 is a conceptual diagram when a vertical line is drawn by a monochromatic laser printer. It is assumed that the optical scanning device scans from left to right in the figure, the left side is the scan upstream side, and the right side is the scan downstream side (the same applies to the other figures). The figure is a diagram in which a straight line is drawn in the vertical direction of the paper (perpendicular to the scanning direction). Due to the precision error of the polygon mirror, rotational fluctuation, etc., it starts to deviate slightly as it scans from the scanning start position, and that deviation occurs. Due to the stacking of the quantities, a large deviation occurs on the downstream side of the scanning.

【0006】一般的なポリゴンミラーの回転変動は、0.
03%P-P 程度であるから、図のように縦線を描画した場
合上流側と下流側では、次のような線のうねりが生じ
る。
The rotation fluctuation of a general polygon mirror is 0.
Since it is about 03% PP, when the vertical line is drawn as shown in the figure, the following line waviness occurs on the upstream side and the downstream side.

【0007】上流側: a =50×0.03/100=0.015(mm) 下流側: b =(50+287 )×0.03/100=0.101(mm) 上流側のうねり量は、十分小さいため、肉眼では識別で
きない。また、下流側は、600dpiの基準単位0.042(mm)
に対しては大きいがうねりの周波数が大きいため単色の
場合は目立たないものである。
Upstream side: a = 50 × 0.03 / 100 = 0.015 (mm) Downstream side: b = (50 + 287) × 0.03 / 100 = 0.101 (mm) Since the amount of swell on the upstream side is small enough, Cannot be identified. On the downstream side, the standard unit of 600 dpi is 0.042 (mm).
However, since the frequency of the swell is large, it is not noticeable in the case of a single color.

【0008】しかしながら、色重ねのカラー画像になっ
た場合には、ズレ量が大きく目立つようになる。つま
り、図3は、走査方向が同じ場合で、カラーレーザープ
リンタで縦線を描画したときの概念図である。図では、
左から右にレーザーが走査している。ここで、実線は第
1のポリゴンミラーで走査して得られた線を、破線は第
2のポリゴンミラーで走査して得られた線を示す。ま
た、本例では用紙中央付近で2つのポリゴンミラーによ
るビームが重なるように調整している。
However, in the case of a color image in which the colors are overlapped, the amount of deviation becomes noticeable. That is, FIG. 3 is a conceptual diagram when a vertical line is drawn by a color laser printer in the same scanning direction. In the figure,
The laser is scanning from left to right. Here, the solid line shows the line obtained by scanning with the first polygon mirror, and the broken line shows the line obtained by scanning with the second polygon mirror. Further, in this example, the beams from the two polygon mirrors are adjusted to overlap each other near the center of the sheet.

【0009】図において、走査の上流側(図の左側)端
では2つの線のズレ量cはさほど大きくない(2a=0.
030mm )が、走査の下流側(図の右側)端で、2つの線
の開き量dが最大になる。調整の誤差とうねりの誤差が
重なるような最悪の場合、その合計量は前記単色レーザ
プリンタで縦線を描画したときの下流側のうねり量の2
倍( 2b=0.202mm)に等しい。
In the figure, the shift amount c between the two lines is not so large at the upstream side (left side in the figure) of the scanning (2a = 0.
030 mm) is the downstream (right side in the figure) end of the scan, and the distance d between the two lines becomes maximum. In the worst case where the adjustment error and the waviness error overlap, the total amount is 2 of the waviness amount on the downstream side when a vertical line is drawn by the monochromatic laser printer.
Equivalent to double (2b = 0.202 mm).

【0010】このように、カラーの場合は2つの色が重
なったり離れたりすると、画像がにじんだり、色目が変
わったりするので目立ちやすく、その量を小さくするこ
とが求められている。
As described above, in the case of color, when two colors are overlapped or separated from each other, the image is blurred or the color is changed, so that it is conspicuous and it is required to reduce the amount.

【0011】本発明は上述の課題に鑑みて成されたもの
であり、光走査装置のポリゴンミラーの精度誤差,回転
変動等により起こる色ズレを最小限に抑え、高速で、且
つ、鮮明なカラー画像を提供できるカラー画像形成装置
を提供することを目的とする。
The present invention has been made in view of the above-mentioned problems, and minimizes color misregistration caused by an accuracy error, rotational fluctuation, etc. of a polygon mirror of an optical scanning device, and achieves high speed and clear color. An object is to provide a color image forming apparatus capable of providing an image.

【0012】[0012]

【課題を解決するための手段】上述の課題を解決するた
めに本発明は、反射面に向けて光ビームを入射させ、該
光ビームを偏向して画像担持体面上を走査する回転多面
鏡を具備した光走査装置を具備し、少なくとも前記光走
査装置を二つ配置し、該各光走査装置が前記画像担持体
面の異なる位置又は異なる時間で光走査を行うカラー画
像形成装置において、前記画像担持体面から見て互いに
逆方向に走査されるように前記各回転多面鏡の回転方向
を互いに異ならせるように構成する。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotary polygonal mirror for injecting a light beam toward a reflecting surface, deflecting the light beam, and scanning the surface of an image carrier. A color image forming apparatus comprising: an optical scanning device, wherein at least two optical scanning devices are arranged, and each optical scanning device performs optical scanning at different positions on the image carrier surface or at different times. wherein the so that is scanned in opposite directions when viewed from the body surface direction of rotation of the rotary polygon mirror
The configured in so that differently from each other.

【0013】一方、反射面に向けて光ビームを入射さ
せ、該光ビームを偏向して画像担持体面上を走査する回
転多面鏡と、該回転多面鏡と前記画像担持体面との間に
設けられ、前記反射面で偏向された光ビームを前記画像
担持体面上に結像する走査レンズと、からなる光走査装
置を具備し、少なくとも二つの前記光走査装置を配置
し、該各光走査装置が前記画像担持体面の異なる位置又
は異なる時間で光走査を行うよう構成したカラー画像形
成装置において、前記二つの光走査装置は、前記各走査
レンズへの光ビームの入射方向、および前記各走査レン
ズの光軸に対して前記反射面への光ビームの入射方向を
一致させると共に、前記画像担持体面から見て互いに逆
方向に走査されるように構成する。この場合も、前記画
像担持体面から見て互いに逆方向に走査されるように前
記各回転多面鏡の回転方向を互いに異ならせても良い。
On the other hand, a rotary polygonal mirror for injecting a light beam toward the reflecting surface, deflecting the light beam to scan the surface of the image carrier, and provided between the rotary polygonal mirror and the surface of the image carrier. A scanning lens that forms an image of the light beam deflected by the reflecting surface on the surface of the image carrier, and at least two optical scanning devices are arranged, and each optical scanning device is provided. In a color image forming apparatus configured to perform optical scanning at different positions on the surface of the image carrier or at different times, the two optical scanning devices are configured to perform the scanning
The direction of incidence of the light beam on the lens and the direction of incidence of the light beam on the reflecting surface are aligned with the optical axis of each scanning lens , and scanning is performed in opposite directions when viewed from the surface of the image carrier. To configure. Also in this case, the rotating directions of the respective rotary polygon mirrors may be different from each other so that the images are scanned in opposite directions when viewed from the surface of the image carrier.

【0014】上述の構成によれば、走査上流側の走査に
ついては、ズレ量が小さく、下流側に走査するにしたが
ってズレ量が大きくなることを利用して、画像担持体面
から見て互いに逆方向に走査されるために、下流側のズ
レ量をできる限り抑えることが可能となる。
According to the above arrangement, the amount of deviation in the scanning on the upstream side is small, and the amount of deviation increases as the scanning is performed on the downstream side. Since the scanning is performed in the same manner, it becomes possible to suppress the shift amount on the downstream side as much as possible.

【0015】[0015]

【発明の実施の形態】本発明の実施の形態を図を用いて
説明する。図1は、本発明のカラープリンタの概略図で
あり、以下、図の符号について説明する。Aは感光体4
の面を光走査する光走査装置であり、その中に光源1が
配置されている。光源1は半導体レーザ等の光ビームを
照射させる。また、2は光源1からの光ビームを偏向さ
せて感光体4の面に走査するポリゴンミラーであり、回
転多面鏡を含み、不図示のポリゴンモータにより回転多
面鏡を回転させるように構成し、感光体4の面にX方向
に向けて光走査される。3は走査用レンズであり、感光
体4の表面に集光する。5はビームディテクターであ
り、感光体4上の書き込み開始位置を設定させる。ま
た、Bは、他の感光体40を光走査する光走査装置であ
り、感光体4の走査面と同じ側に向けて光ビームを感光
体40の面にY方向に走査させる。光走査装置Bも光走
査装置Aと同様にポリゴンミラー20,走査用レンズ3
0,ビームディテクター50で構成されている。半導体
レーザー1,10は、その入射方向を走査用レンズ3,
30の光軸に対して回転多面鏡の反射面へ入射する光ビ
ームの入射方向を一致させている。また、本発明の特徴
である、ポリゴンミラー3,30の回転方向はそれぞれ
互いに反対方向に回転させて感光体4,40上での走査
方向をX又はY方向にそれぞれ互いに反対方向になるよ
う構成している。また、各感光体4,40の表面を走査
する位置は本実施の形態に示した、二つの感光体を用い
た場合は異なる位置に照射されるが、これに限定され
ず、一つの感光体の周囲に現像装置を複数配置して、同
じ位置に異なる時間で光走査するものであっても良い。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a color printer according to the present invention, and reference numerals in the drawing will be described below. A is photoconductor 4
Is a light scanning device that optically scans the surface of the light source, and the light source 1 is disposed therein. The light source 1 emits a light beam such as a semiconductor laser. Reference numeral 2 denotes a polygon mirror that deflects the light beam from the light source 1 to scan the surface of the photoconductor 4, and includes a rotary polygon mirror, and is configured to rotate the rotary polygon mirror by a polygon motor (not shown). The surface of the photoconductor 4 is optically scanned in the X direction. Reference numeral 3 denotes a scanning lens, which focuses light on the surface of the photoconductor 4. A beam detector 5 sets a writing start position on the photoconductor 4. Further, B is an optical scanning device that optically scans the other photoconductor 40, and causes the surface of the photoconductor 40 to be scanned with a light beam in the Y direction toward the same side as the scanning surface of the photoconductor 4. Like the optical scanning device A, the optical scanning device B also has a polygon mirror 20 and a scanning lens 3
0, a beam detector 50. The semiconductor lasers 1 and 10 are arranged such that the incident direction thereof is the scanning lens 3,
The incident directions of the light beams incident on the reflecting surface of the rotary polygon mirror are aligned with the optical axis of 30. Further, as a feature of the present invention, the rotation directions of the polygon mirrors 3 and 30 are opposite to each other so that the scanning directions on the photoconductors 4 and 40 are opposite to each other in the X or Y direction. is doing. Further, the positions of scanning the surfaces of the photoconductors 4 and 40 are irradiated to different positions when the two photoconductors are used as shown in the present embodiment, but the present invention is not limited to this, and one photoconductor is used. It is also possible to arrange a plurality of developing devices around and to optically scan the same position at different times.

【0016】6は中間転写体であり、不図示であるが、
各感光体4,40には、その周りに配置した異なる色を
含有した現像装置によりトナー像が形成され、トナー像
をこの中間転写体6の表面に重ね合わせることでカラー
画像が形成される。
Reference numeral 6 is an intermediate transfer member, not shown,
A toner image is formed on each of the photoconductors 4 and 40 by a developing device arranged around the photoconductor, and a color image is formed by superimposing the toner image on the surface of the intermediate transfer member 6.

【0017】次に画像形成について説明する。二つの光
源1,2より発射された光束を、ポリゴンミラ−3,4
でそれぞれの光路に反射される。レーザー光が照射され
ることによってできた感光体4,40表面の潜像は、不
図示の複数の現像器で現像され、中間転写体6に転写さ
れ、第2転写器7によって紙に転写される。
Next, image formation will be described. The luminous fluxes emitted from the two light sources 1 and 2 are reflected by the polygon mirrors-3 and 4
Is reflected by each optical path. The latent images on the surfaces of the photoconductors 4 and 40 formed by irradiation with the laser light are developed by a plurality of developing devices (not shown), transferred to the intermediate transfer member 6, and transferred to paper by the second transfer device 7. It

【0018】このような構成のカラー画像形成装置にお
いて、ズレ量を確認した図3と同様な実験をおこなっ
た。図4は本発明の特徴の通りに感光体4,40の走査
方向が逆の場合で、本発明のカラープリンタで縦線を描
画したときの概念図である。ここで、実線はポリゴンミ
ラー2で左から右に走査して得られた線Xを、破線はポ
リゴンミラー20で右から左に走査して得られた線Yを
示す。本例でも用紙中央付近で2つのスキャナによるビ
ームが重なるように調整している。
In a color image forming apparatus having such a structure, the same experiment as in FIG. 3 was carried out to confirm the amount of deviation. FIG. 4 is a conceptual diagram when a vertical line is drawn by the color printer of the present invention when the scanning directions of the photoconductors 4 and 40 are opposite to each other as the feature of the present invention. Here, the solid line indicates the line X obtained by scanning the polygon mirror 2 from left to right, and the broken line indicates the line Y obtained by scanning the polygon mirror 20 from right to left. Also in this example, adjustment is made so that the beams from the two scanners overlap near the center of the paper.

【0019】この場合、2つの線のズレ量e、fは位置
によらず、その量は単色レーザプリンタで縦線を描画し
たときの上流側のうねり量と下流側のうねり量の和に等
しいため、a+b=0.116mm となり、カラープリンタの
場合、各色で描画した線のズレ量は人間の目の特性上、
0.15mm以下であることが望ましいとされているため、本
発明を用いれば、この目標を達成できることが理解でき
る。
In this case, the deviation amounts e and f of the two lines are independent of the position, and the amount is equal to the sum of the undulation amount on the upstream side and the undulation amount on the downstream side when a vertical line is drawn by a monochromatic laser printer. Therefore, a + b = 0.116 mm, and in the case of a color printer, the amount of deviation of the lines drawn in each color is due to the characteristics of the human eye.
Since it is desirable that the thickness is 0.15 mm or less, it can be understood that this target can be achieved by using the present invention.

【0020】本発明の走査用レンズの光軸に対して反射
ミラーに照射する方向を同じにするのが好ましい。その
理由は、従来より回転多面鏡の反射面に関して、走査用
レンズの光軸に対して斜めから照射する構成をとると、
回転多面鏡の反射面に於ける反射点が光軸に対して非対
称に移動するため、fθ特性と像面湾曲が光軸に対して
非対称になり、走査方向を逆にしても、二つの光走査装
置の走査した像高位置やレーザビーム径が一致しないた
め回転変動等に起因したズレ量の問題を解決したとして
も、この非対称性の問題で画像品質が低下するからであ
る。
It is preferable that the optical axis of the scanning lens of the present invention is irradiated in the same direction on the reflecting mirror. The reason for this is that, conventionally, with respect to the reflecting surface of the rotary polygon mirror, if the configuration is such that irradiation is performed obliquely to the optical axis of the scanning lens,
Since the reflection point on the reflecting surface of the rotary polygon mirror moves asymmetrically with respect to the optical axis, the fθ characteristic and the field curvature become asymmetrical with respect to the optical axis. This is because even if the problem of the amount of misalignment caused by rotational fluctuation or the like is solved because the image height position scanned by the scanning device and the laser beam diameter do not match, the image quality is degraded due to this asymmetry problem.

【0021】しかし、反射ミラーに照射する方向を同じ
にすることは本発明の必須要件ではない。つまり、上述
の非対称性の問題を解決する手段として、特開平2−2
3313に示すような光軸に対して非対称に非球面レン
ズを形成することが知られているが、このようなレンズ
でfθ特性と像面湾曲の問題を解決したものであるなら
ば、上述のような問題はないため同方向とする必要はな
い。また、本発明では、走査用レンズの光軸に対して反
射ミラーに照射する方向を同じにするようにしたが、よ
り好ましくは反射面に於ける走査用レンズの光軸に対し
て略同じ方向で、且つ同じ角度で入射させるとさらに良
い結果が得られる。
However, it is not an essential requirement of the present invention to make the reflecting mirrors irradiate in the same direction. That is, as means for solving the above-mentioned problem of asymmetry, Japanese Patent Laid-Open No. 2-2
It is known to form an aspherical lens asymmetrically with respect to the optical axis as shown by 3313, but if such a lens solves the problems of fθ characteristic and field curvature, Since there is no such problem, it is not necessary to use the same direction. Further, in the present invention, the direction of irradiating the reflection mirror with respect to the optical axis of the scanning lens is made to be the same, but more preferably, it is substantially the same direction with respect to the optical axis of the scanning lens on the reflecting surface. Therefore, even better results can be obtained by making the light incident at the same angle.

【0022】また、本実施の形態のように、ポリゴンミ
ラーの回転方向も必ずしも逆方向にする必要はない。つ
まり、光走査する感光体面と逆側に走査するように構成
する光走査装置ならば、ポリゴンミラーの回転方向が同
じであっても感光体面上に逆方向に走査することが可能
である。さらに光走査装置の位置についても、必ずしも
光走査する感光体4,40の面が本実施の形態のように
同じ側に走査するような位置に配置する事はなく、感光
体4,40を介して対向するように配置しても良い。
Also, the rotation direction of the polygon mirror does not necessarily have to be reversed as in this embodiment. That is, with an optical scanning device configured to scan on the side opposite to the photoconductor surface for optical scanning, it is possible to scan on the photoconductor surface in the opposite direction even if the rotation direction of the polygon mirror is the same. Further, regarding the position of the optical scanning device, the surface of the photoconductor 4 or 40 to be optically scanned is not necessarily arranged at a position to scan on the same side as in the present embodiment. They may be arranged so as to face each other.

【0023】[0023]

【発明の効果】二つの光走査系から感光体の異なる位置
又は異なる時間に走査される複数のレーザービームによ
って感光体面に走査する方向が互いに逆にしたために、
ポリゴンミラーの回転変動等による色ズレを最小限に抑
えることができる。
As described above, the directions of scanning on the surface of the photoconductor by the plural laser beams scanned from the two optical scanning systems at different positions of the photoconductor or at different times are opposite to each other.
It is possible to minimize color misregistration due to fluctuations in rotation of the polygon mirror.

【0024】また、走査用レンズの光軸に対して反射ミ
ラーに照射する方向を同じにすることで、色ズレを最小
限に抑えながら、光学的な性能(像面湾曲・歪曲収差)
の非対称性による色ズレを最小限に抑えることができ
る。
Further, by making the direction of irradiating the reflecting mirror the same with respect to the optical axis of the scanning lens, optical performance (field curvature / distortion aberration) is minimized while minimizing color misregistration.
Color misregistration due to the asymmetry of can be minimized.

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

【図1】本発明のカラ−プリンタの概略説明図FIG. 1 is a schematic explanatory view of a color printer of the present invention.

【図2】単色レーザプリンタで縦線を描画したときの説
明図
FIG. 2 is an explanatory diagram when a vertical line is drawn by a monochromatic laser printer.

【図3】走査方向が同じの場合で、カラーレーザープリ
ンタで縦線を描画したときの説明図
FIG. 3 is an explanatory diagram when a vertical line is drawn by a color laser printer when the scanning directions are the same.

【図4】本発明の走査方向が逆の場合で、カラープリン
タで縦線を描画したときの説明図
FIG. 4 is an explanatory diagram when a vertical line is drawn by a color printer when the scanning direction of the present invention is opposite.

【符号の説明】[Explanation of symbols]

1,10:光源 2,20:ポリゴンミラー 3,30:走査用レンズ 4,40:感光体 5,50:ビームディテクター 6:中間転写体 7:第2転写器 1, 10: Light source 2, 20: Polygon mirror 3, 30: Scanning lens 4,40: photoconductor 5,50: Beam detector 6: Intermediate transfer body 7: Second transfer device

フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B41J 2/44 G02B 26/10 G03G 15/04 Front page continuation (58) Fields surveyed (Int.Cl. 7 , DB name) B41J 2/44 G02B 26/10 G03G 15/04

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】反射面に向けて光ビームを入射させ、該光
ビームを偏向して画像担持体面上を走査する回転多面鏡
を具備した光走査装置を具備し、少なくとも前記光走査
装置を二つ配置し、該各光走査装置が前記画像担持体面
の異なる位置又は異なる時間で光走査を行うカラー画像
形成装置において、 前記画像担持体面から見て互いに逆方向に走査されるよ
うに前記各回転多面鏡の回転方向を互いに異ならせたこ
とを特徴とするカラー画像形成装置。
1. An optical scanning device comprising a rotary polygonal mirror for injecting a light beam toward a reflecting surface, deflecting the light beam, and scanning the surface of an image bearing member. In the color image forming apparatus in which the two optical scanning devices perform optical scanning at different positions of the image carrier surface or at different times, the respective rotations are performed so that they are scanned in opposite directions when viewed from the image carrier surface. A color image forming apparatus characterized in that the polygon mirrors are rotated in different directions .
【請求項2】反射面に向けて光ビームを入射させ、該光
ビームを偏向して画像担持体面上を走査する回転多面鏡
と、該回転多面鏡と前記画像担持体面との間に設けら
れ、前記反射面で偏向された光ビームを前記画像担持体
面上に結像する走査レンズと、からなる光走査装置を具
備し、 少なくとも二つの前記光走査装置を配置し、該各光走査
装置が前記画像担持体面の異なる位置又は異なる時間で
光走査を行うよう構成したカラー画像形成装置におい
て、 前記二つの光走査装置は、前記各走査レンズへの光ビー
ムの入射方向、および前記各走査レンズの光軸に対して
前記反射面への光ビームの入射方向を一致させると共
に、 前記画像担持体面から見て互いに逆方向に走査されるよ
うに構成したことを特徴とするカラー画像形成装置。
2. A light beam is incident on a reflecting surface, and the light beam
A rotating polygon mirror that deflects the beam and scans the surface of the image carrier.
And provided between the rotary polygon mirror and the surface of the image carrier.
And the light beam deflected by the reflecting surface is transferred to the image carrier.
A scanning lens that forms an image on the surface, and an optical scanning device
And at least two optical scanning devices are arranged, and each optical scanning device is provided.
The device can be placed at different positions on the image carrier surface or at different times.
A color image forming apparatus configured to perform optical scanning
The two optical scanning devices are arranged so that the optical beam to each scanning lens is
The incident direction of the beam and the optical axis of each scanning lens
When the incident directions of the light beams on the reflecting surface are matched,
In addition, the scanning is performed in the opposite directions when viewed from the surface of the image carrier.
A color image forming apparatus having the above structure.
【請求項3】反射面に向けて光ビームを入射させ、該光
ビームを偏向して画像担持体面上を走査する回転多面鏡
と、該回転多面鏡と前記画像担持体面との間に設けら
れ、前記反射面で偏向された光ビームを前記画像担持体
面上に結像する走査レンズと、からなる光走査装置を具
備し、 少なくとも二つの前記光走査装置を配置し、該各光走査
装置が前記画像担持体面の異なる位置又は異なる時間で
光走査を行うよう構成したカラー画像形成装置におい
て、 前記二つの光走査装置は、前記各走査レンズの光軸に対
して前記反射面への光ビームの入射方向を一致させると
共に、 前記画像担持体面から見て互いに逆方向に走査されるよ
うに前記各回転多面鏡の回転方向を互いに異ならせたこ
とを特徴とするカラー画像形成装置。」
3. A rotary polygonal mirror for injecting a light beam toward a reflecting surface, deflecting the light beam to scan the surface of the image carrier, and provided between the rotary polygonal mirror and the surface of the image carrier. A scanning lens that forms an image of the light beam deflected by the reflection surface on the surface of the image carrier, and at least two optical scanning devices are arranged, and each optical scanning device is In a color image forming apparatus configured to perform optical scanning at different positions on the image carrier surface or at different times, the two optical scanning devices may be configured such that the optical beam of the light beam to the reflection surface is relative to the optical axis of each scanning lens. A color image forming apparatus, wherein the incident directions are made coincident with each other , and the rotating directions of the respective rotary polygon mirrors are made different from each other so that they are scanned in mutually opposite directions when viewed from the surface of the image carrier. "
JP11545898A 1998-04-24 1998-04-24 Color image forming equipment Expired - Fee Related JP3470040B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11545898A JP3470040B2 (en) 1998-04-24 1998-04-24 Color image forming equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11545898A JP3470040B2 (en) 1998-04-24 1998-04-24 Color image forming equipment

Publications (2)

Publication Number Publication Date
JPH11301023A JPH11301023A (en) 1999-11-02
JP3470040B2 true JP3470040B2 (en) 2003-11-25

Family

ID=14663062

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11545898A Expired - Fee Related JP3470040B2 (en) 1998-04-24 1998-04-24 Color image forming equipment

Country Status (1)

Country Link
JP (1) JP3470040B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6179314B2 (en) 2013-09-24 2017-08-16 ブラザー工業株式会社 Scanning optical device

Also Published As

Publication number Publication date
JPH11301023A (en) 1999-11-02

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