JP3481724B2 - Scanning imaging mirror for optical scanning - Google Patents
Scanning imaging mirror for optical scanningInfo
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- JP3481724B2 JP3481724B2 JP12011195A JP12011195A JP3481724B2 JP 3481724 B2 JP3481724 B2 JP 3481724B2 JP 12011195 A JP12011195 A JP 12011195A JP 12011195 A JP12011195 A JP 12011195A JP 3481724 B2 JP3481724 B2 JP 3481724B2
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- imaging mirror
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Description
【０００１】[0001]
【産業上の利用分野】この発明は光走査用の走査結像ミ
ラーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning image forming mirror for optical scanning.
【０００２】[0002]
【従来の技術】回転多面鏡等の光偏向器により等角速度
的に偏向された偏向光束を、走査結像光学系により被走
査面に向かって集光させるとともに、被走査面の光走査
を等速化することは、光プリンターを初めとする種々の
光走査装置において広く行われている。2. Description of the Related Art A deflected light beam deflected at a constant angular velocity by an optical deflector such as a rotary polygon mirror is condensed toward a surface to be scanned by a scanning imaging optical system, and the optical scanning of the surface to be scanned is performed. Speeding up is widely performed in various optical scanning devices including optical printers.
【０００３】上記走査結像光学系としては、「ｆθレン
ズ」を用いるものが良く知られているが、ｆθレンズに
代えて光走査用の「走査結像ミラー」を用いるものも提
案されている。As the above-mentioned scanning image forming optical system, one using a "fθ lens" is well known, but a system using a "scanning image forming mirror" for optical scanning instead of the fθ lens is also proposed. .
【０００４】図９（ａ）は従来提案されている走査結像
ミラーを用いる光走査装置の１例を示している。ＬＤや
ＬＥＤである光源１から放射された光束は、カップリン
グレンズ２を透過して光偏向器３（この例では「ほぞ型
ミラー」である）に到り、光偏向器３により等角速度的
に偏向される。FIG. 9A shows an example of an optical scanning device using a conventionally proposed scanning imaging mirror. A light beam emitted from a light source 1 which is an LD or an LED passes through a coupling lens 2 and reaches a light deflector 3 (which is a “tenon mirror” in this example). Biased to.
【０００５】偏向光束は走査結像ミラー４により反射さ
れ、被走査面上に光スポットとして集光する。ドラム状
の感光体５は、その母線Ｌを主走査方向に平行にして上
記被走査面に接するように設けられており、上記光スポ
ットにより光走査される。The deflected light beam is reflected by the scanning and imaging mirror 4 and is condensed as a light spot on the surface to be scanned. The drum-shaped photoconductor 5 is provided so that its generatrix L is parallel to the main scanning direction and is in contact with the surface to be scanned, and is optically scanned by the light spot.
【０００６】なお、光偏向器３における所謂「面倒れ」
を補正するために、長尺シリンダレンズや長尺シリンダ
ミラーあるいは長尺トロイダルレンズを、走査結像ミラ
ーと被走査面との間に用いることも知られており、この
場合には、カップリングレンズ２からの光束を光偏向器
３の偏向反射面位置に主走査対応方向に長い線像に結像
させるようにする。The so-called "face-up" in the optical deflector 3
It is also known to use a long cylinder lens, a long cylinder mirror or a long toroidal lens between the scanning imaging mirror and the surface to be scanned in order to correct the The light flux from 2 is formed into a long line image in the direction corresponding to the main scanning at the position of the deflecting reflection surface of the optical deflector 3.
【０００７】光走査用の走査結像ミラーを用いる場合、
偏向光束は走査結像ミラーにより光偏向器の側へ反射さ
れるので、光偏向器から走査結像ミラーへ向かう光路
と、走査結像ミラーによる反射光束の光路を分離する必
要がある。When a scanning imaging mirror for optical scanning is used,
Since the deflected light beam is reflected by the scanning and imaging mirror toward the optical deflector side, it is necessary to separate the optical path from the optical deflector to the scanning and imaging mirror and the optical path of the reflected light beam by the scanning and imaging mirror.
【０００８】この光路分離を行うのに、図９（ｂ）に示
すように、光偏向器３により偏向される偏向光束の掃引
面３Ａに対し、走査結像ミラー４を掃引面３Ａに直交す
る方向へΔＺだけ「シフト」させる方法（あるいはシフ
トとともに反射面にティルト（傾き）を与える方法）が
知られている。In order to perform this optical path separation, as shown in FIG. 9B, the scanning imaging mirror 4 is orthogonal to the sweep surface 3A with respect to the sweep surface 3A of the deflected light beam deflected by the optical deflector 3. There is known a method of "shifting" in the direction by ΔZ (or a method of giving a tilt (tilt) to the reflecting surface with the shift).
【０００９】上記シフト量：ΔＺにより、副走査方向に
対応する方向において、反射光束が入射光束と分離角：
θをなして分離する。Due to the shift amount: ΔZ, the reflected light beam and the incident light beam have a separation angle in the direction corresponding to the sub-scanning direction:
Make θ and separate.
【００１０】図９（ｂ）に示すように、上記シフトを行
うと、走査結像ミラー４の幅方向の中心を通る法線４Ａ
と前記掃引面３Ａとが「ΔＺ」だけずれることになる。As shown in FIG. 9B, when the above shift is performed, a normal line 4A passing through the center of the scanning and imaging mirror 4 in the width direction is obtained.
And the sweep surface 3A are displaced by "ΔZ".
【００１１】従来、走査結像ミラーは、図９に示す走査
結像ミラー４のように、その幅方向に関し、幅方向の中
心を通る法線４Ａに対して対称的に形成されていた。こ
のようにすると、図９の例では（ｂ）に示すように、光
走査の際に実際に使用される有効反射面領域４Ｂに対し
て、法線４Ａより上の大部分が使用されない領域として
無駄になるばかりでなく、このような無駄な反射面部分
を有することにより走査結像ミラー４が不必要に大型化
する問題があった。Conventionally, the scanning and imaging mirror is formed symmetrically with respect to the width direction, with respect to the normal 4A passing through the center of the width direction, like the scanning and imaging mirror 4 shown in FIG. In this way, in the example of FIG. 9, as shown in FIG. 9B, most of the effective reflection surface area 4B actually used during the optical scanning is above the normal line 4A as an unused area. There is a problem that the scanning and imaging mirror 4 is unnecessarily increased in size due to the useless reflection surface portion as well as being wasted.
【００１２】[0012]
【発明が解決しようとする課題】この発明は上述した事
情に鑑みてなされたものであって、光走査の際に有効に
使用されない反射面部分が少なく、小幅に実現できる新
規な光走査用の走査結像ミラーの提供を目的とする（請
求項１〜６）。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is a novel optical scanning device that can be realized in a small width with a small number of reflecting surface portions that are not effectively used during optical scanning. Aiming to provide a scanning imaging mirror ( contract
Requirements 1-6 ).
【００１３】[0013]
【課題を解決するための手段】この発明の「光走査用の
走査結像ミラー」は「等角速度的に偏向される偏向光束
を被走査面に向かって集光させるとともに、被走査面の
走査速度を等速化する機能を持つ凹面鏡」である。The "scan imaging mirror for optical scanning" of the present invention "condenses a deflected light beam deflected at a constant angular velocity toward a surface to be scanned and scans the surface to be scanned. It is a concave mirror that has the function of making speed uniform.
【００１４】請求項１、２記載の走査結像ミラーは、概
略、図１（ａ）に示すごとき形態である。符号４００は
走査結像ミラー、符号４０１は「反射面」を示してい
る。以下、参考例と共に、請求項１、２記載の走査結像
ミラーを、図１（ａ）に示す走査結像ミラー４００に基
づいて説明する。[0014] scan image forming mirror according to claim 1, wherein the outline in the form such shown in FIG. 1 (a). Reference numeral 400 indicates a scanning imaging mirror, and reference numeral 401 indicates a "reflection surface". Hereinafter, the scanning and imaging mirrors according to claims 1 and 2 will be described with reference to the scanning and imaging mirror 400 shown in FIG.
【００１５】参考例として示す走査結像ミラーは、以下
の如き特徴を有する。The scanning and imaging mirror shown as a reference example has the following features.
【００１６】即ち、図１（ｂ）は、参考例の走査結像ミ
ラー４００を、長手方向中央部で切断した断面形状を示
している。That is, FIG. 1B shows a cross-sectional shape of the scanning image forming mirror 400 of the reference example, which is cut at the central portion in the longitudinal direction.
【００１７】図１（ｂ）において、参考例の走査結像ミ
ラー４００の反射面４０１の形状は「球面形状」であ
る。即ち、反射面４０１は、球面４０３の一部であり、
「球面４０３の一部を、球面４０３における大円面４０
５に平行な２平面４０７，４０９により短冊状に切り取
った細長いミラー形状」を有する。In FIG. 1B, the shape of the reflecting surface 401 of the scanning image forming mirror 400 of the reference example is "spherical". That is, the reflecting surface 401 is a part of the spherical surface 403,
“Part of the spherical surface 403 is a great circle surface 40 on the spherical surface 403.
5 has an elongated mirror shape that is cut in a strip shape by two flat surfaces 407 and 409 parallel to the surface 5.
【００１８】大円は「球の中心を含む平面と球面との交
線」であり、球の切り口として得られる円のうちで最大
のものである。この明細書において上記「大円面」は
「大円を含む平面」を意味する。The great circle is the "line of intersection of the plane containing the center of the sphere and the sphere" and is the largest of the circles obtained as a cut of the sphere. In this specification, the “great circle surface” means “a plane including a great circle”.
【００１９】走査結像ミラー４００は、主走査対応方向
に平行的に、即ち、ミラー形状の長手方向が主走査方向
と平行的に対応するように配備され、副走査方向に対応
するミラー幅方向における中心線（図１（ｂ）におい
て、平面４０７，４０９の間を２等分する平面４１１と
反射面４０１との交線）が、上記大円面４０５と球面４
０３との交線とずれている。The scanning / imaging mirror 400 is arranged parallel to the main scanning corresponding direction, that is, the longitudinal direction of the mirror shape corresponds to the main scanning direction in parallel, and the mirror width direction corresponding to the sub scanning direction. 1 (the intersection line between the plane 411 that divides the planes 407 and 409 into two in FIG. 1B and the reflecting surface 401) is the great circle surface 405 and the spherical surface 4
It is out of line with 03.
【００２０】上記「細長いミラー形状」における長手方
向は、２つの平面４０７，４０９による切り口としての
側縁部に対応する方向であり、短手方向は「ミラー幅方
向」である。The longitudinal direction in the above-mentioned "elongated mirror shape" is the direction corresponding to the side edge portion as the cut surface by the two planes 407 and 409, and the lateral direction is the "mirror width direction".
【００２１】大円面４０５と球面４０３との交線は、上
記の如く「ミラー幅方向における中心線」とずれる。上
記「交線」は、走査結像ミラー４００における反射面内
に含まれてもよいが、図１（ｃ）に示すように、反射面
４０１が、大円面４０５と球面４０３との交線を含まな
い」ようにすることもできる。 The line of intersection between the great circle surface 405 and the spherical surface 403 is displaced from the "center line in the mirror width direction" as described above. The “intersection line” may be included in the reflection surface of the scanning imaging mirror 400, but as shown in FIG. 1C, the reflection surface 401 is the intersection line of the great circle surface 405 and the spherical surface 403. Ru can also be included not "as the.
【００２２】図１（ｃ）において、符号４０７Ａは、大
円面４０５に平行な平面を示し、平面４０９とともに球
面４０３の一部を反射面として切り取る平面であり、符
号４１１Ａは平面４０７Ａと４０９の間を２等分する平
面で、この平面４１１Ａと反射面４０１との交線が「中
心線」である。In FIG. 1 (c), reference numeral 407A indicates a plane parallel to the great circle surface 405, and is a plane which cuts off a part of the spherical surface 403 together with the plane 409 as a reflecting surface. Reference numeral 411A indicates the planes 407A and 409. This is a plane that divides the space into two equal parts, and the line of intersection between this plane 411A and the reflecting surface 401 is the "center line".
【００２３】請求項１記載の走査結像ミラーは、以下の
如き特徴を有する。The scanning / imaging mirror according to claim 1 has the following features.
【００２４】即ち、反射面形状が
Ｘ（Ｈ）＝ＣＨ2／［１＋√｛１−（１＋Ｋ）Ｃ
2Ｈ2｝］＋ΣＡi・Ｈ＊＊ｉ
なる曲線をＸ軸の回りに回転して得られる「共軸非球面
形状」である。That is, the reflection surface shape is X (H) = CH 2 / [1 + √ {1- (1 + K) C
2 H 2 }] + ΣA i · H ** i is a “coaxial aspherical shape” obtained by rotating the curve around the X axis.
【００２５】上記曲線の式は一般に非球面を表わす式と
して知られ、Ｃは「Ｘ軸上における曲率」を与え、Ｋは
「円錐定数」を与える。「Ａi」は非球面係数を表わ
し、和は添字：ｉに就き取る。「Ｈ＊＊ｉ」はＨ（Ｘ軸
からの距離）のｉ乗を表わす。The equation of the above curve is generally known as an equation representing an aspherical surface. C gives "curvature on the X axis" and K gives "conic constant". “A i ” represents an aspherical surface coefficient, and the sum is assigned to the subscript: i. “H ** i” represents the i-th power of H (distance from the X axis).
【００２６】図１（ｄ），（ｅ）において、符号４１３
は、上記曲線：Ｘ（Ｈ）をＸ軸の回りに回転して得られ
る「共軸非球面形状」を表わす。Ｘ軸の正の向きは図の
矢印方向であり、原点は曲線Ｘ（Ｈ）とＸ軸の交点であ
る。またＨはＸ軸に直交する方向においてＸ軸からの距
離を表わしている。In FIGS. 1D and 1E, reference numeral 413
Represents the “coaxial aspherical shape” obtained by rotating the above curve: X (H) around the X axis. The positive direction of the X axis is the direction of the arrow in the figure, and the origin is the intersection of the curve X (H) and the X axis. H represents the distance from the X axis in the direction orthogonal to the X axis.
【００２７】図１（ｄ）に示すように、請求項３記載の
走査結像ミラー４００は、共軸非球面形状４１３の一部
を、Ｘ軸を含む平面（図面に直交する平面）に平行な２
平面４１５，４１６により短冊状に切り取った細長いミ
ラー形状を有し、主走査対応方向に平行的に配備され
る。As shown in FIG. 1D, in the scanning and imaging mirror 400 according to claim 3, a part of the coaxial aspherical shape 413 is parallel to a plane including the X axis (a plane orthogonal to the drawing). 2
It has an elongated mirror shape cut in a strip shape by the planes 415 and 416, and is arranged parallel to the main scanning corresponding direction.
【００２８】副走査方向に対応するミラー幅方向におけ
る中心線（平面４１５，４１６の間を２等分する平面４
１７と反射面４０１の交線）は、Ｘ軸を含む平面との交
線とずれている。The center line in the mirror width direction corresponding to the sub-scanning direction (the plane 4 that bisects the planes 415 and 416)
The intersection line 17 and the reflection surface 401 is deviated from the intersection line with the plane including the X axis.
【００２９】請求項１記載の走査結像ミラーの場合も、
図１（ｅ）に示すように「反射面４０１が、Ｘ軸を含む
平面４１８と共軸非球面形状４１３との交線を含まな
い」ようにすることができる（請求項２）。Also in the case of the scanning / imaging mirror according to claim 1 ,
As shown in FIG. 1 (e), “the reflecting surface 401 does not include a line of intersection between the flat surface 418 including the X axis and the coaxial aspherical surface shape 413” ( claim 2 ).
【００３０】図１（ｅ）において、符号４１５ＡはＸ軸
を含む平面４１８に平行な平面を示し、平面４１５Ａは
平面４１６とともに共軸非球面形状４１３の一部を反射
面として切り取る。符号４１７Ａは平面４１５Ａと４１
６の間を２等分する平面で、この平面４１７Ａと共軸非
球面形状４１３との交線が反射面４０１の幅方向におけ
る「中心線」である。In FIG. 1 (e), reference numeral 415A indicates a plane parallel to the plane 418 including the X axis, and the plane 415A cuts a part of the coaxial aspherical shape 413 together with the plane 416 as a reflecting surface. Reference numeral 417A is the planes 415A and 41.
6 is a plane that bisects 6 and the line of intersection between this plane 417A and the coaxial aspherical shape 413 is the "center line" in the width direction of the reflecting surface 401.
【００３１】上記のように、請求項１、２記載の走査結
像ミラーではその反射面形状は、軸の回りに回転対称な
形状（球面もしくは共軸非球面形状）である。As described above, in the scanning / imaging mirrors according to the first and second aspects, the shape of the reflecting surface is rotationally symmetrical about the axis (spherical surface or coaxial aspherical surface).
【００３２】請求項３〜５記載の走査結像ミラーは、概
略、図２（ａ）に示すごとき形態である。符号５００は
走査結像ミラー、符号５０１は「反射面」を示してい
る。以下、請求項５〜７記載の走査結像ミラーを、図２
（ａ）に示す走査結像ミラー５００に基づいて説明す
る。The scanning and imaging mirrors described in claims 3 to 5 are generally in the form as shown in FIG. Reference numeral 500 indicates a scanning imaging mirror, and reference numeral 501 indicates a "reflection surface". Hereinafter, the scanning and imaging mirror according to claims 5 to 7 will be described with reference to FIG.
A description will be given based on the scanning / imaging mirror 500 shown in FIG.
【００３３】図２（ｂ）に於いて、符号５０３は曲率半
径：Ｒｍを持つ基準円弧を示す。また符号５０４は、基
準円弧５０３を含む面（図の面）内で、基準円弧５０３
の中央から距離：Ｒｓだけ離れ、基準円弧５０３の中央
における接線５０５に平行な軸を表わす。In FIG. 2B, reference numeral 503 represents a reference arc having a radius of curvature: Rm. Further, reference numeral 504 indicates a reference arc 503 within a plane (a plane in the drawing) including the reference arc 503.
Represents the axis parallel to the tangent line 505 at the center of the reference arc 503, separated from the center by a distance Rs.
【００３４】請求項３記載の走査結像ミラー５００は、
その反射面形状が「曲率半径：Ｒｍを持つ基準円弧５０
３を、軸５０４の回りに回転して得られる凹曲面形状」
である。A scanning and imaging mirror 500 according to claim 3 is
The shape of the reflecting surface is “reference arc 50 having a radius of curvature: Rm.
3 is a concave curved surface shape obtained by rotating the shaft 3 around the axis 504. "
Is.
【００３５】図２（ｃ）は、請求項５記載の走査結像ミ
ラー５００を、図２（ｂ）における直線５０６（基準円
弧５０３の中心と同円弧５０３の中央を結ぶ直線）を含
み図面に直交する面で切断した断面形状を示している。FIG. 2C shows the scanning and imaging mirror 500 according to claim 5 including a straight line 506 (a straight line connecting the center of the reference arc 503 and the center of the same arc 503) in FIG. 2B. A cross-sectional shape taken along a plane orthogonal to each other is shown.
【００３６】走査結像ミラー５００は、上記「凹曲面形
状」を、基準円弧を含む面５０６Ａ（図２（ｂ）におい
て、基準円弧５０３と軸５０４を共有する平面）に平行
な２つの平面５０７，５０８により短冊状に切り取った
細長いミラー形状を有する。そして走査結像ミラー５０
０は主走査対応方向に平行的に配備される。The scanning and imaging mirror 500 has the above "concave curved surface shape" in two planes 507 parallel to a surface 506A including a reference arc (a plane sharing the axis 504 with the reference arc 503 in FIG. 2B). , 508 has an elongated mirror shape cut into a strip shape. And the scanning imaging mirror 50
0 is arranged parallel to the main scanning corresponding direction.
【００３７】副走査方向に対応するミラー幅方向におけ
る中心線（平面５０７，５０８の間を２等分する平面５
０９と反射面５０１との交線）は、基準円弧５０３とず
れている。即ち上記中心線は、基準円弧５０３と軸５０
４により共有される平面５０６Ａ内にない。The center line in the mirror width direction corresponding to the sub-scanning direction (the plane 5 that bisects the planes 507 and 508)
The line of intersection 09 between the reflecting surface 501 and the reflecting surface 501 is displaced from the reference arc 503. That is, the center line is the reference arc 503 and the axis 50.
4 is not in plane 506A shared by.
【００３８】このように請求項３記載の走査結像ミラー
５００においては、その反射面形状を定めるにあたって
先ず「基準円弧」が定まり、これを回転させるとき、基
準円弧が掃引する面として反射面形状が定まる。この反
射面形状は「樽型の凹面」である。As described above, in the scanning and imaging mirror 500 according to the third aspect, the "reference arc" is first determined when determining the shape of the reflection surface, and when this is rotated, the shape of the reflection surface is used as the surface on which the reference arc sweeps. Is determined. This reflection surface shape is a “barrel-shaped concave surface”.
【００３９】請求項４記載の走査結像ミラーは、以下の
如き特徴を有する。The scanning and imaging mirror described in claim 4 has the following features.
【００４０】即ち、請求項４記載の走査結像ミラーは、
その反射面形状が、
Ｒ（Ｈ）＝ＣＨ2／［１＋√｛１−（１＋Ｋ）Ｃ
2Ｈ2｝］＋ΣＡi・Ｈ＊＊ｉ
なる基準弧状曲線を、この基準弧状曲線を含む面内で、
基準弧状曲線の中央から距離：Ｒｓだけ離れ、基準弧状
曲線の中央における接線に平行な軸の回りに回転して得
られる凹曲面形状である。上記式におけるＣはＲ軸上の
曲率、Ｋは円錐定数、ΣＡi・Ｈ＊＊ｉは前記非球面式
におけると同じ意味を有する。That is, the scanning and imaging mirror according to claim 4 is
The shape of the reflecting surface is R (H) = CH 2 / [1 + √ {1- (1 + K) C
2 H 2 }] + ΣA i · H ** i in the plane including this reference arc-shaped curve,
It is a concave curved surface shape that is obtained by rotating the wire about a shaft parallel to a tangent line at the center of the reference arc-shaped curve and separated from the center of the reference arc-shaped curve by a distance Rs. In the above formula, C has a curvature on the R axis, K has a conic constant, and ΣA i · H ** i has the same meaning as in the aspherical formula.
【００４１】図２（ｄ）において、符号５１３は上記
「基準弧状曲線」を表わし、符号５１４は「基準弧状曲
線５１３を含む面内で、基準弧状曲線５１３の中央から
距離：Ｒｓだけ離れ、基準弧状曲線５１３の中央におけ
る接線に平行」な軸を表わす。Ｒ軸の正の向きは矢印の
向きであり、原点は曲線５１３とＲ軸の交点である。In FIG. 2 (d), reference numeral 513 represents the above-mentioned "reference arc-shaped curve", and reference numeral 514 represents "in the plane including the reference arc-shaped curve 513, separated from the center of the reference arc-shaped curve 513 by the distance Rs. Represents an axis "parallel to the tangent at the center of arc curve 513". The positive direction of the R-axis is the direction of the arrow, and the origin is the intersection of the curve 513 and the R-axis.
【００４２】図２（ｅ）は、請求項４記載の走査結像ミ
ラー５００を、図２（ｄ）においてＲ軸を含み図面に直
交する面で切断した断面形状を示している。FIG. 2E shows a sectional shape of the scanning and imaging mirror 500 according to the fourth aspect of the present invention, which is taken along a plane including the R axis in FIG. 2D and orthogonal to the drawing.
【００４３】走査結像ミラー５００は、上記「凹曲面形
状」を、基準弧状曲線を含む面５１６（図２（ｄ）にお
いて、基準弧状曲線５１３と軸５１４を共有する平面）
に平行な２つの平面５１７，５１８により短冊状に切り
取った細長いミラー形状を有する。そして走査結像ミラ
ー５００は主走査対応方向に平行的に配備される。The scanning and imaging mirror 500 has the above "concave curved surface shape" on a surface 516 including a reference arc-shaped curve (in FIG. 2D, a plane sharing the axis 514 with the reference arc-shaped curve 513).
It has an elongated mirror shape cut in a strip shape by two planes 517 and 518 parallel to the. The scanning / imaging mirror 500 is arranged parallel to the main scanning corresponding direction.
【００４４】副走査方向に対応するミラー幅方向（図２
（ｅ）において上下方向）における中心線（平面５１
７，５１８の間を２等分する平面５１９と反射面５０１
との交線）は、基準弧状曲線５１３とずれている。即
ち、上記中心線は、基準弧状曲線５１３と軸５１４によ
り共有される平面５１６内にない。The mirror width direction corresponding to the sub-scanning direction (see FIG.
The center line (plane 51 in the vertical direction in (e))
A flat surface 519 and a reflecting surface 501 that divide the space between 7, 518 into two equal parts.
The intersection line) with the reference arc-shaped curve 513 is deviated. That is, the centerline is not in the plane 516 shared by the reference arc 513 and the axis 514.
【００４５】図２（ｆ），（ｇ）に示すように、反射面
５０１を切り取るための一方の平面５０７Ａ（または５
１７Ａ）を、平面５０６Ａ（または５１６）よりも他方
の平面５０８（５１８）側に位置させることにより、反
射面５０１が「基準円弧５０３（平面５０６Ａ上にあ
る）または基準弧状曲線５１３（平面５１６上にある）
を含まない」ように構成できる（請求項５）。As shown in FIGS. 2 (f) and 2 (g), one plane 507A (or 5) for cutting out the reflecting surface 501 is used.
17A) is positioned closer to the other plane 508 (518) than the plane 506A (or 516), so that the reflecting surface 501 becomes “reference arc 503 (on plane 506A)” or reference arc-shaped curve 513 (on plane 516). It is in)
Can be configured so as to "do not include" ( Claim 5 ).
【００４６】上記請求項１〜５の任意の１つに記載の走
査結像ミラーは「プラスチックにより成形」することが
できる（請求項６）。The scanning and imaging mirror according to any one of claims 1 to 5 can be "molded with plastic" ( claim 6 ).
【００４７】[0047]
【作用】上記のように、この発明の走査結像ミラーは、
反射面の形状が、幅方向の中心線に対して対称的になっ
ていない。As described above, the scanning / imaging mirror of the present invention is
The shape of the reflecting surface is not symmetrical with respect to the center line in the width direction.
【００４８】[0048]
【実施例】以下、具体的な実施例を説明する。EXAMPLES Specific examples will be described below.
【００４９】図３は、図９（ａ）に即して説明した型の
光走査装置の走査結像ミラーとして図１に即して説明し
た請求項１記載の走査結像ミラーを用いた例である。FIG. 3 shows an example in which the scanning / imaging mirror according to claim 1 described with reference to FIG. 1 is used as the scanning / imaging mirror of the optical scanning device of the type described with reference to FIG. 9A. Is.
【００５０】走査結像ミラー４００Ａは、図１（ｂ）ま
たは（ｄ）に即して説明した型のものであり、光偏向器
３に依る偏向光束に走査される部分が、反射面形状にお
ける大円面（もしくは共軸非球面形状のＸ軸を含む面）
４０５Ａに対してΔＺだけシフトすることにより入射光
束と反射光束の分離を行っている。The scanning / imaging mirror 400A is of the type described with reference to FIG. 1 (b) or (d), and the portion scanned by the deflected light beam by the optical deflector 3 has a reflecting surface shape. Great circle surface (or surface including coaxial aspherical X-axis)
The incident light flux and the reflected light flux are separated by shifting by ΔZ with respect to 405A.
【００５１】走査結像ミラー４００Ａを用いたことによ
り、従来の走査結像ミラーに比して破線で示す部分が不
要となり、走査結像ミラーの幅を有効に縮小できる。By using the scanning / imaging mirror 400A, the portion indicated by the broken line is unnecessary as compared with the conventional scanning / imaging mirror, and the width of the scanning / imaging mirror can be effectively reduced.
【００５２】図４は、図９（ａ）に即して説明した型の
光走査装置の走査結像ミラーとして、図１に即して説明
した請求項２記載の走査結像ミラーを用いた例である。FIG. 4 uses the scanning / imaging mirror according to claim 2 described with reference to FIG. 1 as the scanning / imaging mirror of the optical scanning device of the type described with reference to FIG. 9A. Here is an example.
【００５３】走査結像ミラー４００Ｂは、図１（ｃ）ま
たは（ｅ）に即して説明した型のものであり、光偏向器
３に依る偏向光束に走査される部分が、反射面形状にお
ける大円面（もしくは共軸非球面形状のＸ軸を含む面）
４０５Ａに対してΔＺだけシフトすることにより入射光
束と反射光束の分離を行っている。また、上記面４０５
Ａは反射面に含まれていない。The scanning / imaging mirror 400B is of the type described with reference to FIG. 1 (c) or (e), and the portion scanned by the deflected light beam by the optical deflector 3 has a reflecting surface shape. Great circle surface (or surface including coaxial aspherical X-axis)
The incident light flux and the reflected light flux are separated by shifting by ΔZ with respect to 405A. Also, the surface 405
A is not included in the reflecting surface.
【００５４】走査結像ミラー４００Ｂを用いたことによ
り、従来の走査結像ミラーに比して破線で示す部分が不
要となり、走査結像ミラーの幅を上記図３の実施例のも
のよりもさらに有効に縮小できる。By using the scanning / imaging mirror 400B, the portion indicated by the broken line is unnecessary as compared with the conventional scanning / imaging mirror, and the width of the scanning / imaging mirror is further increased than that of the embodiment of FIG. Can be effectively reduced.
【００５５】なお、図３，４の例では面倒れ補正のため
に長尺シリンダレンズ６が用いられている。In the examples shown in FIGS. 3 and 4, the long cylinder lens 6 is used to correct the surface tilt.
【００５６】請求項３〜５記載の走査結像ミラーは、主
・副走査方向に対応方向で、反射面の曲率が異なるた
め、副走査方向に対応する方向でよりパワーの強い「ア
ナモフィック」な結像系となる。このような走査結像ミ
ラーは例えば、図５に示すような光走査装置に利用でき
る。In the scanning / imaging mirrors according to the third to fifth aspects, since the reflecting surfaces have different curvatures in the directions corresponding to the main / sub-scanning directions, "anamorphic" having a stronger power in the direction corresponding to the sub-scanning direction. It becomes an imaging system. Such a scanning and imaging mirror can be used, for example, in an optical scanning device as shown in FIG.
【００５７】図５において、ＬＤやＬＥＤである光源１
０から放射された光束は、カップリングレンズ１２を透
過するとシリンダレンズ１３により副走査方向に対応す
る方向へ収束され、光偏向器１４（この例では「ほぞ型
ミラー」である）の偏向反射面位置に、主走査方向に対
応する方向に長い線像として結像し、光偏向器１４によ
り等角速度的に偏向される。In FIG. 5, the light source 1 which is an LD or LED
When the light flux emitted from 0 passes through the coupling lens 12, it is converged by the cylinder lens 13 in the direction corresponding to the sub-scanning direction, and the deflection reflection surface of the optical deflector 14 (in this example, it is a "tenon mirror"). An image is formed at the position as a long line image in the direction corresponding to the main scanning direction, and is deflected by the optical deflector 14 at a constant angular velocity.
【００５８】偏向光束は走査結像ミラー１５により反射
され、被走査面上に光スポットとして集光する。ドラム
状の感光体１７は、その母線Ｌを主走査方向に平行にし
て上記被走査面に接するように設けられ、上記光スポッ
トにより光走査される。The deflected light beam is reflected by the scanning and imaging mirror 15 and is condensed as a light spot on the surface to be scanned. The drum-shaped photoconductor 17 is provided so that its generatrix L is parallel to the main scanning direction and is in contact with the surface to be scanned, and is optically scanned by the light spot.
【００５９】図６は、図５に即して説明した型の光走査
装置の走査結像ミラーとして、図２に即して説明した請
求項３、４記載の走査結像ミラーを用いた例である。FIG. 6 shows a scanning image forming mirror of the optical scanning device of the type described with reference to FIG. 5 and the contract described with reference to FIG.
This is an example using the scanning imaging mirror described in the third and fourth aspects .
【００６０】走査結像ミラー５００Ａは、図２（ｃ）ま
たは（ｅ）に即して説明した型のものであり、光偏向器
１４に依る偏向光束に走査される部分と、反射面形状に
おける基準円弧（もしくは基準弧状曲線）を含む面５０
６ａに対してΔＺだけシフトすることにより入射光束と
反射光束の分離を行っている。The scanning / imaging mirror 500A is of the type described with reference to FIG. 2 (c) or (e), and has a portion to be scanned by the deflected light beam by the optical deflector 14 and a reflection surface shape. A surface 50 including a reference arc (or a reference arc-shaped curve)
The incident light flux and the reflected light flux are separated by shifting by ΔZ with respect to 6a.
【００６１】走査結像ミラー５００Ａを用いたことによ
り、従来の走査結像ミラーに比して破線で示す部分が不
要となり、走査結像ミラーの幅を有効に縮小できる。By using the scanning / imaging mirror 500A, the portion indicated by the broken line is unnecessary as compared with the conventional scanning / imaging mirror, and the width of the scanning / imaging mirror can be effectively reduced.
【００６２】図７は、図５に即して説明した型の光走査
装置の走査結像ミラーとして、図２に即して説明した請
求項５記載の走査結像ミラーを用いた例である。FIG. 7 shows a scanning image forming mirror of the optical scanning device of the type described with reference to FIG. 5 and the contract described with reference to FIG.
This is an example using the scanning imaging mirror described in claim 5 .
【００６３】走査結像ミラー５００Ｂは、図２（ｆ）ま
たは（ｇ）に即して説明した型のものであり、光偏向器
１４に依る偏向光束に走査される部分と、反射面形状に
おける基準円弧（もしくは基準弧状曲線）を含む面５０
６ａに対してΔＺだけシフトすることにより入射光束と
反射光束の分離を行っている。また、上記面５０６ａは
反射面に含まれていない。The scanning / imaging mirror 500B is of the type described with reference to FIG. 2 (f) or (g), and has a portion to be scanned by the deflected light beam by the optical deflector 14 and a reflecting surface shape. A surface 50 including a reference arc (or a reference arc-shaped curve)
The incident light flux and the reflected light flux are separated by shifting by ΔZ with respect to 6a. The surface 506a is not included in the reflecting surface.
【００６４】走査結像ミラー５００Ｂを用いたことによ
り、従来の走査結像ミラーに比して破線で示す部分が不
要となり、走査結像ミラーの幅を上記図６の実施例のも
のよりもさらに有効に縮小できる。By using the scanning / imaging mirror 500B, the portion indicated by the broken line is unnecessary as compared with the conventional scanning / imaging mirror, and the width of the scanning / imaging mirror is further wider than that of the embodiment shown in FIG. Can be effectively reduced.
【００６５】なお、図６，７において符号１８は透明な
平行平板を示す。平行平板１８は、走査結像ミラー５０
０Ａ，５００Ｂによる光束分離効果を高めるため、入射
光束の掃引面に対して傾けて配備されている。In FIGS. 6 and 7, reference numeral 18 indicates a transparent parallel plate. The parallel plate 18 is a scanning imaging mirror 50.
In order to enhance the luminous flux separation effect by 0A and 500B, it is arranged so as to be inclined with respect to the sweep surface of the incident luminous flux.
【００６６】請求項１〜５記載の走査結像ミラーは何れ
も、プラスチックの成形加工により作製できるが、特に
請求項２，５記載の走査結像ミラーは、プラスチックの
成形加工により効率良く作製できる。Any of the scanning and imaging mirrors described in claims 1 to 5 can be manufactured by molding plastic,
The scanning and imaging mirrors according to the second and fifth aspects can be efficiently manufactured by molding plastic.
【００６７】即ち、請求項２、５記載の走査結像ミラー
は、反射面が反射面形状における大円面（もしくは共軸
非球面形状のＸ軸を含む面）あるいは基準円弧（もしく
は基準弧状曲線）を含む面を含まない。上記大円面等は
反射面形状における対称面をなすものであるから、反射
面がこれらの面を含まないということは、一つの型駒を
用いて２以上の走査結像ミラーを形成できることを意味
するのである。That is, in the scanning / imaging mirrors according to claims 2 and 5 , the reflecting surface is a great circular surface (or a surface including the X axis of the coaxial aspherical surface) in the reflecting surface shape, or a reference arc (or a reference arc-shaped curve). ) Is not included. Since the great circle surface and the like form a symmetrical surface in the shape of the reflecting surface, the fact that the reflecting surface does not include these surfaces means that two or more scanning image forming mirrors can be formed using one mold piece. It means.
【００６８】図８を参照すると、（ａ），（ｂ）におけ
る符号１００は、前記参考例の走査結像ミラーの反射面
形状を与える球面を有する「型の面」を示している。Referring to FIG. 8, reference numeral 100 in (a) and (b) indicates a "mold surface" having a spherical surface which gives the reflection surface shape of the scanning image forming mirror of the reference example .
【００６９】このような型駒を用いると、例えば、図８
（ａ）に符号１００Ａ，１００Ｂで示す部分（互いに対
称な形状を有する）を反射面としてプラスチックに転写
することにより一度に２個の走査結像ミラーを作製でき
るし、図８（ｂ）の符号１００ａ，１００ｂ，１００
ｃ，１００ｄで示す部分（互いに対称な形状を有する）
を反射面としてプラスチックに転写することにより一度
に４個の走査結像ミラーを作製できる。When such a mold piece is used, for example, as shown in FIG.
Two scanning image forming mirrors can be manufactured at one time by transferring the portions (having symmetrical shapes to each other) indicated by the reference numerals 100A and 100B in (a) to the plastic as a reflecting surface, and the reference numerals in FIG. 100a, 100b, 100
Portions indicated by c and 100d (having shapes symmetrical to each other)
It is possible to fabricate four scanning image forming mirrors at a time by transferring as a reflective surface to plastic.
【００７０】上記各実施例では、光偏向器による偏向光
束は、偏向反射面の回転軸に直交する面内で偏向される
が、これに限らず、偏向光束が上記回転軸に対して、９
０度以外の角をなして偏向するようにしても良い。In each of the above embodiments, the deflected light beam by the optical deflector is deflected in the plane orthogonal to the rotation axis of the deflective reflection surface, but the invention is not limited to this.
The deflection may be performed by forming an angle other than 0 degree.
【００７１】また走査結像ミラーは前記シフト量：ΔＺ
の他に、ティルト角：Δθを有しても良く、これらは光
束の分離角や走査線の曲がりの補正に応じて最適化され
る。Further, the scanning imaging mirror has the above shift amount: ΔZ.
In addition to the above, a tilt angle: Δθ may be provided, and these are optimized according to the correction of the separation angle of the light flux and the bending of the scanning line.
【００７２】[0072]
【発明の効果】以上に説明したように、この発明によれ
ば新規な「走査結像ミラー」を提供できる。この発明の
走査結像ミラーは、上記の如き構成となっているから、
副走査方向に対応する幅方向の大きさを有効に縮小で
き、走査結像ミラーを有効に小型化できるので、光走査
装置のコンパクト化が可能になる。As described above, according to the present invention, a novel "scanning / imaging mirror" can be provided. Since the scanning and imaging mirror of the present invention has the above-mentioned configuration,
Since the size in the width direction corresponding to the sub-scanning direction can be effectively reduced and the scanning imaging mirror can be effectively downsized, the optical scanning device can be made compact.
【００７３】特に、請求項６記載の発明のように、この
発明の走査結像ミラーをプラスチック成形で作製するよ
うにすれば、走査結像ミラーの小型化に伴いプラスチッ
ク材料が少なくてすみ、走査結像ミラーを低コスト化す
ることが可能である。Particularly, if the scanning and imaging mirror of the present invention is made by plastic molding as in the sixth aspect of the present invention, the plastic material can be reduced and the scanning can be performed with the downsizing of the scanning and imaging mirror. It is possible to reduce the cost of the imaging mirror.
【００７４】また請求項２、５記載の走査結像ミラー
は、これをプラスチックで成形加工するようにすると、
一つの型駒により複数の走査結像ミラーあるいは走査結
像ミラーの金駒を１度に作製できるので生産性が向上す
る。Further, in the scanning and imaging mirrors according to the second and fifth aspects, when the scanning and imaging mirror is molded from plastic,
Since a plurality of scanning image forming mirrors or metal pieces of the scanning image forming mirror can be manufactured at one time by one mold piece, the productivity is improved.
【図１】参考例および請求項１、２記載の発明の走査結
像ミラーを説明するための図である。FIG. 1 is a diagram for explaining a scanning imaging mirror of the invention according to a reference example and claims 1 and 2 .
【図２】請求項３〜５記載の発明の走査結像ミラーを説
明するための図である。FIG. 2 is a diagram for explaining a scanning / imaging mirror of the invention described in claims 3-5 .
【図３】この発明の１実施例を説明するための図であ
る。FIG. 3 is a diagram for explaining one embodiment of the present invention.
【図４】この発明の別の実施例を説明するための図であ
る。FIG. 4 is a diagram for explaining another embodiment of the present invention.
【図５】請求項３〜５記載の発明の走査結像ミラーを利
用できる光走査装置の１例を説明するための図である。FIG. 5 is a diagram for explaining an example of an optical scanning device that can utilize the scanning imaging mirror of the invention described in claims 3 to 5 .
【図６】この発明の他の実施例を説明するための図であ
る。FIG. 6 is a diagram for explaining another embodiment of the present invention.
【図７】この発明の更に他の実施例を説明するための図
である。FIG. 7 is a diagram for explaining still another embodiment of the present invention.
【図８】請求項２、５記載の発明の走査結像ミラーをプ
ラスチック成形で作製する場合の利点を説明するための
図である。FIG. 8 is a diagram for explaining advantages when the scanning imaging mirror according to the second and fifth aspects of the invention is manufactured by plastic molding.
【図９】従来技術とその問題点を説明するための図であ
る。FIG. 9 is a diagram for explaining a conventional technique and its problems.
４００ 走査結像ミラー ４０１ 反射面 ４０５ 大円面 ４０７，４０９ 大円面に平行な２つの平面 400 scanning imaging mirror 401 reflective surface 405 great circle 407,409 Two planes parallel to the great circle surface
Claims (6)
面に向かって集光させるとともに、被走査面の走査速度
を等速化する機能を持つ凹面鏡であって、 反射面形状が Ｘ（Ｈ）＝ＣＨ2／［１＋√｛１−（１＋Ｋ）Ｃ
2Ｈ2｝］＋ΣＡi・Ｈ＊＊ｉ なる曲線をＸ軸の回りに回転して得られる共軸非球面形
状であり、この共軸非球面形状の一部を、Ｘ軸を含む平
面に平行な２平面により短冊状に切り取った細長いミラ
ー形状を有し、主走査対応方向に平行的に配備され、 副走査方向に対応するミラー幅方向における中心線が、
上記Ｘ軸を含む平面との交線とずれていることを特徴と
する光走査用の走査結像ミラー。1. A concave mirror having a function of converging a deflected light beam deflected at a constant angular velocity toward a surface to be scanned and making the scanning speed of the surface to be scanned uniform. (H) = CH 2 / [1 + √ {1- (1 + K) C
2 H 2 }] + ΣA i · H ** i is a coaxial aspherical shape obtained by rotating the curve around the X axis, and a part of this coaxial aspherical surface is transformed into a plane including the X axis. It has an elongated mirror shape that is cut in a strip shape by two parallel planes, is arranged in parallel in the main scanning corresponding direction, and the center line in the mirror width direction corresponding to the sub scanning direction is
A scanning and imaging mirror for optical scanning, which is deviated from a line of intersection with the plane including the X axis.
含まないことを特徴とする光走査用の走査結像ミラー。2. The scanning imaging mirror for optical scanning according to claim 1, wherein the reflecting surface does not include a line of intersection between the plane including the X axis and the coaxial aspherical shape. mirror.
面に向かって集光させるとともに、被走査面の走査速度
を等速化する機能を持つ凹面鏡であって、 曲率半径：Ｒｍを持つ基準円弧を、この基準円弧を含む
面内で、基準円弧の中央から距離：Ｒｓだけ離れ、上記
基準円弧の中央における接線に平行な軸の回りに回転し
て得られる凹曲面形状を反射面形状として有し、上記凹
曲面形状を上記基準円弧を含む面に平行な２平面により
短冊状に切り取った細長いミラー形状を有し、主走査対
応方向に平行的に配備され、 副走査方向に対応するミラー幅方向における中心線が、
上記基準円弧とずれていることを特徴とする光走査用の
走査結像ミラー。3. A concave mirror having a function of converging a deflected light beam deflected at a constant angular velocity toward a surface to be scanned and making the scanning speed of the surface to be scanned uniform, the radius of curvature: Rm A reflecting surface having a concave curved surface shape obtained by rotating a reference arc having the reference arc by a distance Rs from the center of the reference arc and rotating about an axis parallel to a tangent line at the center of the reference arc. It has a slender mirror shape that has the concave curved surface shape cut into two strips parallel to the plane including the reference arc, and is arranged parallel to the main scanning corresponding direction and corresponds to the sub scanning direction. The center line in the width direction of the mirror
A scanning imaging mirror for optical scanning, which is deviated from the reference arc.
面に向かって集光させるとともに、被走査面の走査速度
を等速化する機能を持つ凹面鏡であって、 Ｒ（Ｈ）＝ＣＨ2／［１＋√｛１−（１＋Ｋ）Ｃ
2Ｈ2｝］＋ΣＡi・Ｈ＊＊ｉ なる基準弧状曲線を、この基準弧状曲線を含む面内で、
基準弧状曲線の中央から距離：Ｒｓだけ離れ、上記基準
弧状曲線の中央における接線に平行な軸の回りに回転し
て得られる凹曲面形状を反射面形状として有し、上記凹
曲面形状を上記基準弧状曲線を含む面に平行な２平面に
より短冊状に切り取った細長いミラー形状を有し、主走
査対応方向に平行的に配備され、 副走査方向に対応するミラー幅方向における中心線が、
上記基準弧状曲線とずれていることを特徴とする光走査
用の走査結像ミラー。4. A concave mirror having a function of converging a deflected light beam deflected at a constant angular velocity toward a surface to be scanned and making the scanning speed of the surface to be scanned uniform, wherein R (H) = CH 2 / [1 + √ {1- (1 + K) C
2 H 2 }] + ΣA i · H ** i in the plane including this reference arc-shaped curve,
The concave curved surface shape is obtained by rotating about a shaft parallel to the tangent line at the center of the reference arcuate curve and separated from the center of the reference arcuate curve by Rs, and the concave curved surface shape is used as the reference. It has a long and narrow mirror shape cut in a strip shape by two planes parallel to the surface including the arc-shaped curve, and is arranged parallel to the main scanning corresponding direction, and the center line in the mirror width direction corresponding to the sub-scanning direction is
A scanning imaging mirror for optical scanning, which is deviated from the reference arc-shaped curve.
おいて、 反射面が、基準円弧または基準弧状曲線を含まないこと
を特徴とする光走査用の走査結像ミラー。5. The scanning imaging mirror for optical scanning according to claim 3, wherein the reflecting surface does not include a reference arc or a reference arc-shaped curve.
５記載の走査結像ミラーにおいて、 プラスチックにより成形されることを特徴とする光走査
用の走査結像ミラー。6. A method according to claim 1, 2 or 3 or 4 or
5. The scanning / imaging mirror for optical scanning according to 5, wherein the scanning / imaging mirror is formed of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12011195A JP3481724B2 (en) | 1995-05-18 | 1995-05-18 | Scanning imaging mirror for optical scanning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12011195A JP3481724B2 (en) | 1995-05-18 | 1995-05-18 | Scanning imaging mirror for optical scanning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08313835A JPH08313835A (en) | 1996-11-29 |
| JP3481724B2 true JP3481724B2 (en) | 2003-12-22 |
Family
ID=14778217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12011195A Expired - Lifetime JP3481724B2 (en) | 1995-05-18 | 1995-05-18 | Scanning imaging mirror for optical scanning |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3481724B2 (en) |
-
1995
- 1995-05-18 JP JP12011195A patent/JP3481724B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08313835A (en) | 1996-11-29 |
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