JP2005309133A - Optical scanner - Google Patents

Optical scanner Download PDF

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JP2005309133A
JP2005309133A JP2004126703A JP2004126703A JP2005309133A JP 2005309133 A JP2005309133 A JP 2005309133A JP 2004126703 A JP2004126703 A JP 2004126703A JP 2004126703 A JP2004126703 A JP 2004126703A JP 2005309133 A JP2005309133 A JP 2005309133A
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lens
optical
fixing
scanning direction
main scanning
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Katsuhiko Nakaya
勝彦 中家
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical scanner in which an fθ lens is miniaturized and held at an accurate position. <P>SOLUTION: The fθ lens 14 is held in a main scanning direction (X-direction) at a position at which the lens is abutted to an abutting guide 24 provided on a frame 11, and is fixed with a fixing spring 30 to be held in an optical axis direction (Y-direction) at a position at which the lens is abutted to a projection 26 provided on the frame 11. The fθ lens 14 is fixed in a form that the frame 11 and the fθ lens 14 interpose the fixing spring 30 so that the fθ lens 14 acts as a retaining piece for the fixing spring, thus a fixing screw or the like to fix the fixing spring 30 is dispensed of. The height (in Z-direction) of an arm 34 and of the projection 26 is limited to a height or smaller with which a beam passing through the fθ lens 14 is not interfered, the width (main scanning direction) of the fθ lens 14 is made as large as to cover the passing region of the beam only, and the fixing portion with a spring or the like is unnecessary, thus the fθ lens 14 is miniaturized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、光走査装置に関する。   The present invention relates to an optical scanning device.

従来よりプリンタや複写機等の画像形成装置においては光走査装置による走査露光が一般に用いられているが、ビームを偏向する偏向器にポリゴンミラーを使用して被走査面を主走査方向にビームで走査する方法が一般的である。   Conventionally, scanning exposure by an optical scanning device is generally used in image forming apparatuses such as printers and copiers. However, a polygon mirror is used as a deflector for deflecting the beam so that the surface to be scanned is beamed in the main scanning direction. A scanning method is common.

このときポリゴンミラーによって偏向されたビームは主走査方向にレンズパワーを持つ走査レンズ（ｆθレンズ）を通過して被走査面上に結像する。このｆθレンズは光走査装置内で正確な位置精度を保つ必要があり、特に光軸方向と主走査方向の位置精度はレンズパワーを持つ方向であるため重要である。   At this time, the beam deflected by the polygon mirror passes through a scanning lens (fθ lens) having a lens power in the main scanning direction and forms an image on the surface to be scanned. The fθ lens needs to maintain accurate positional accuracy in the optical scanning device, and is particularly important because the positional accuracy in the optical axis direction and the main scanning direction is a direction having lens power.

しかし、ｆθレンズを筐体に固定する際にレンズの両端部を光軸方向両側から固定具で挟持・固定する方法の場合、ｆθレンズの主走査方向両端部に挟み代が必要となり、実際にビームが通過する範囲すなわち透過領域よりも挟み代の分だけ主走査方向に大きいサイズのレンズとする必要がある。このため高価な光学部品であるｆθレンズの部品コストが更に上昇してしまう結果となる。   However, when the fθ lens is fixed to the housing, both ends of the lens are clamped and fixed from both sides in the optical axis direction by a fixture, and a pinch is required at both ends of the fθ lens in the main scanning direction. It is necessary to use a lens having a size larger in the main scanning direction than the range in which the beam passes, that is, the nip region than the transmission region. This results in a further increase in the component cost of the fθ lens, which is an expensive optical component.

これを解決するために、固定具によって押圧する部分を副走査方向にずらし、ビームの透過領域を避けて固定する方法が提案されている（例えば、特許文献１参照）。   In order to solve this, a method has been proposed in which a portion to be pressed by a fixing tool is shifted in the sub-scanning direction and fixed while avoiding a beam transmission region (see, for example, Patent Document 1).

この方法では図４（ａ）、図４（ｂ）のように、フレーム１００上にｆθレンズ１０２を保持台１１０と突起１０６に突き当てて押圧・保持するバネ板１０４を用いている。すなわち、突片１０４ａで押圧し保持台１１０に突き当て、突片１０４ｂで押圧し突起１０６に突き当てることでｆθレンズ１０２をフレーム１００上に正確な位置精度で保持している。   In this method, as shown in FIGS. 4A and 4B, a spring plate 104 is used on the frame 100 to press and hold the fθ lens 102 against the holding stand 110 and the protrusion 106. That is, the fθ lens 102 is held on the frame 100 with accurate positional accuracy by being pressed by the protruding piece 104a and abutted against the holding table 110, and pressed by the protruding piece 104b and abutted against the protrusion 106.

しかし、この方法ではｆθレンズ１０２のビーム透過領域Ｈを副走査方向（図中では上下方向）に避けて突片１０４ｂと突起１０６で挟持しているため、ｆθレンズ１０２の副走査方向のサイズすなわち全高を大きくする必要がある。そのため、図４（ｃ）のようにｆθレンズ１０２の全高が大きくなると、ｆθレンズ１０２をフレーム１００に取り付ける際に突片１０４ａと１０４ｂから受ける力（白矢印方向）によりｆθレンズ１０２が回転しやすくなり、正しい支持位置に突き当てられず安定した保持が困難になる。   However, in this method, the beam transmission region H of the fθ lens 102 is avoided in the sub-scanning direction (vertical direction in the drawing) and is sandwiched between the protruding pieces 104b and the protrusions 106. It is necessary to increase the overall height. Therefore, when the total height of the fθ lens 102 is increased as shown in FIG. 4C, the fθ lens 102 is easily rotated by the force (in the direction of the white arrow) received from the projecting pieces 104a and 104b when the fθ lens 102 is attached to the frame 100. Therefore, it is difficult to stably hold the battery without being in contact with the correct support position.

さらに、この方式ではｆθレンズ１０２において特に重要な主走査方向の位置精度を決定するためにｆθレンズ１０２を押圧・突き当てる構成とすることが困難となる。
特開平１０―２０６７６９号公報 （図２、第２〜３頁） Furthermore, with this method, it is difficult to adopt a configuration in which the fθ lens 102 is pressed and abutted to determine the position accuracy in the main scanning direction that is particularly important for the fθ lens 102.
JP-A-10-206769 (FIG. 2, pages 2-3)

本発明は上記事実を考慮し、ｆθレンズを小型化しながら正確な位置精度で保持できる光走査装置を提供することを目的とする。   In view of the above facts, an object of the present invention is to provide an optical scanning device capable of holding an fθ lens with an accurate position accuracy while reducing the size of the fθ lens.

請求項１に記載の光走査装置は、光ビームを射出する光源と、射出された光ビームを主走査方向に偏向させる偏向装置と、偏向された光ビームを被走査面上に結像させる光学部品と、前記光学部品を押圧して筐体との間で挟持する保持部材と、を備え、前記保持部材は、前記光ビームの主走査方向に前記光学部品を押圧し前記筐体との間で挟持固定する第１保持部と、前記光学部品の像形成領域の少なくとも二箇所で前記光ビームの通過位置から前記光ビームの副走査方向にずらした位置を押圧し、筐体との間で前記光学部品を挟持固定する第２保持部とを有することを特徴とする。   The optical scanning device according to claim 1, a light source that emits a light beam, a deflecting device that deflects the emitted light beam in a main scanning direction, and an optical that forms an image of the deflected light beam on a surface to be scanned. A holding member that presses and holds the optical component between the housing and the housing, and the holding member presses the optical component in the main scanning direction of the light beam and between the housing and the housing. Between the first holding unit sandwiched and fixed and the position shifted in the sub-scanning direction of the light beam from the light beam passing position at at least two positions in the image forming region of the optical component, And a second holding part for sandwiching and fixing the optical component.

上記構成の発明では、光学部品を押圧して筐体との間で挟持する保持部材が、光ビームの主走査方向に光学部品を押圧し、且つ光学部品のビームの通過位置から外れた位置を光軸方向に押圧するので、光学部品の主走査方向の寸法を小さく抑えながら正確な位置精度で保持することができる。   In the invention having the above-described configuration, the holding member that presses the optical component and holds it between the housing presses the optical component in the main scanning direction of the light beam, and is positioned away from the beam passage position of the optical component. Since the pressing is performed in the optical axis direction, the optical component can be held with an accurate positional accuracy while keeping the size of the optical component in the main scanning direction small.

請求項２に記載の光走査装置は、前記保持部材は前記光学部品と筐体との間に挟まれ筐体に固定されることを特徴とする。   The optical scanning device according to claim 2 is characterized in that the holding member is sandwiched between the optical component and the casing and fixed to the casing.

上記構成の発明では、保持部材が光学部品と筐体との間に挟まれて固定されるので、保持部材を固定する取付ねじ等の固定手段が不要となり、部品点数と組立工数を削減できる。   In the invention with the above configuration, since the holding member is sandwiched and fixed between the optical component and the housing, a fixing means such as a mounting screw for fixing the holding member becomes unnecessary, and the number of components and the number of assembly steps can be reduced.

本発明は上記構成としたので、ｆθレンズを小型化しながら正確な位置精度で保持できる光走査装置とすることができた。   Since the present invention has the above-described configuration, an optical scanning apparatus that can hold the fθ lens with accurate positional accuracy while miniaturizing it can be obtained.

図１には本発明の第１実施形態に係る光走査装置が示されている。   FIG. 1 shows an optical scanning device according to a first embodiment of the present invention.

図１に示すように、光走査装置１０はポリゴンミラー１２、ｆθレンズ１４、第１シリンダミラー１６、ミラー１８、第２シリンダミラー２０とから構成されている。   As shown in FIG. 1, the optical scanning device 10 includes a polygon mirror 12, an fθ lens 14, a first cylinder mirror 16, a mirror 18, and a second cylinder mirror 20.

ポリゴンミラー１２が図示しない光源から照射されたビームを偏向し、ｆθレンズ１４によって主走査方向に走査するビームとして整形され、第１シリンダミラー１６で副走査方向に整形しつつ光走査装置１０全体を小型化するためにビームを折り曲げ、ミラー１８で再度ビームを折り曲げ、第２シリンダミラー２０で更に副走査方向にビームを整形して被走査面上に結像させる。上記のようにビームを複数のミラーで反射させているため光走査装置１０全体の小型化が可能となるが、各光学部材の光軸、設置位置を厳密に調整・維持する必要がある。   The polygon mirror 12 deflects a beam irradiated from a light source (not shown), is shaped as a beam scanned in the main scanning direction by the fθ lens 14, and is shaped in the sub-scanning direction by the first cylinder mirror 16, and the entire optical scanning device 10 is shaped. In order to reduce the size, the beam is bent, the beam is bent again by the mirror 18, and the beam is further shaped in the sub-scanning direction by the second cylinder mirror 20 to form an image on the surface to be scanned. Since the beam is reflected by a plurality of mirrors as described above, the entire optical scanning device 10 can be reduced in size, but it is necessary to strictly adjust and maintain the optical axis and installation position of each optical member.

図２には本発明の第１実施形態に係る光走査装置のｆθレンズ保持機構が示されている。   FIG. 2 shows the fθ lens holding mechanism of the optical scanning device according to the first embodiment of the present invention.

図２に示すように、ｆθレンズ１４はフレーム１１に保持される際、主走査方向（図中Ｘ方向）にはフレーム１１に設けられた突き当てガイド２４と突き当たる位置で保持され、光軸方向（図中Ｙ）にはフレーム１１に設けられた突起２６に突き当たる位置で保持されるように、固定バネ３０によって固定される。   As shown in FIG. 2, when the fθ lens 14 is held by the frame 11, the fθ lens 14 is held at a position where it abuts against the abutment guide 24 provided in the frame 11 in the main scanning direction (X direction in the drawing). (Y in the drawing) is fixed by a fixing spring 30 so as to be held at a position where it abuts against the protrusion 26 provided on the frame 11.

ｆθレンズ１４は主走査方向（Ｘ方向）には固定バネ３０に設けられたアーム３２によって突き当てガイド２４の方向へ押圧され、突き当てガイド２４に当接した状態で保持される。突き当てガイド２４はフレーム１１に固定されているので位置の変動はなく、アーム３２のバネ定数等に依存せずにｆθレンズ１４の主走査方向（Ｘ方向）の位置精度を保つことができる。この場合、位置精度に影響を与えるのはｆθレンズ１４の主走査方向の寸法のみとなる。   The fθ lens 14 is pressed in the direction of the abutment guide 24 by the arm 32 provided in the fixed spring 30 in the main scanning direction (X direction), and is held in contact with the abutment guide 24. Since the abutment guide 24 is fixed to the frame 11, there is no position variation, and the position accuracy of the fθ lens 14 in the main scanning direction (X direction) can be maintained without depending on the spring constant of the arm 32. In this case, only the dimension of the fθ lens 14 in the main scanning direction affects the position accuracy.

またｆθレンズ１４は光軸方向（Ｙ方向）には固定バネ３０に設けられたアーム３４によって突起２６の方向へ押圧され、突起２６に当接した状態で保持される。突起２６はフレーム１１に固定されているので位置の変動はなく、アーム３４のバネ定数等に依存せずにｆθレンズ１４の光軸方向（Ｙ方向）の位置精度を保つことができる。   The fθ lens 14 is pressed in the direction of the projection 26 by the arm 34 provided in the fixed spring 30 in the optical axis direction (Y direction) and is held in contact with the projection 26. Since the protrusions 26 are fixed to the frame 11, there is no position variation, and the position accuracy of the fθ lens 14 in the optical axis direction (Y direction) can be maintained without depending on the spring constant of the arm 34 or the like.

このとき、アーム３４および突起２６の高さ（Ｚ方向の寸法）はｆθレンズ１４を透過するビームに干渉しない高さ以下に抑えられている。このため、ｆθレンズ１４の幅すなわち主走査方向の寸法はビームが透過する透過領域をクリアするだけでよく、バネ等による押さえ代が不要なので、高価な部材であるｆθレンズ１４を小型化できるため部品コストを削減することもできる。加えて、アーム３４および突起２６は主走査方向（Ｘ方向）のどこに設けてもよく、また個数にも制限はない。   At this time, the height (dimension in the Z direction) of the arm 34 and the protrusion 26 is suppressed to a height that does not interfere with the beam transmitted through the fθ lens 14. For this reason, the width of the fθ lens 14, that is, the dimension in the main scanning direction only needs to clear the transmission region through which the beam is transmitted, and a pressing margin by a spring or the like is not necessary, so the fθ lens 14 that is an expensive member can be downsized. Parts costs can also be reduced. In addition, the arm 34 and the protrusion 26 may be provided anywhere in the main scanning direction (X direction), and the number is not limited.

上記のようにｆθレンズ１４をフレーム１１に固定バネ３０で固定する際には主走査方向（Ｘ方向）、光軸方向（Ｙ方向）の位置決めも固定バネ３０によって同時に行われるので、高い位置精度を保ちながら工数を削減することもできる。   As described above, when the fθ lens 14 is fixed to the frame 11 by the fixing spring 30, the positioning in the main scanning direction (X direction) and the optical axis direction (Y direction) is also performed by the fixing spring 30 at the same time. Man-hours can also be reduced while maintaining

すなわち、固定バネ３０の穴３６に突起２６が嵌るようにフレーム１１に固定バネ３０を嵌め込み、上方（Ｚ方向）から突き当てガイド２４とアーム３２の間に挟むようにｆθレンズ１４を嵌め込むだけで、突起２６と突き当てガイド２４に当接した状態でｆθレンズ１４が保持されるので、簡単かつ高精度に固定・位置決めが行える。   That is, the fixing spring 30 is fitted into the frame 11 so that the projection 26 fits into the hole 36 of the fixing spring 30, and the fθ lens 14 is fitted so as to be sandwiched between the abutment guide 24 and the arm 32 from above (Z direction). Thus, since the fθ lens 14 is held in contact with the protrusion 26 and the abutting guide 24, the fixing and positioning can be performed easily and with high accuracy.

図３には本発明の第１実施形態に係る光走査装置のｆθレンズ保持機構が示されている。   FIG. 3 shows the fθ lens holding mechanism of the optical scanning device according to the first embodiment of the present invention.

図３（ａ）は図２の線ａの断面を図２の右側から見た断面図である。図３（ａ）に示すように、ｆθレンズ１４は突起２６とアーム３４によって挟持され、突起２６に突き当たる位置で固定される。このとき突起２６とアーム３４はビームの透過領域２８（斜線部）に干渉しない高さに抑えられている。アーム３４は黒矢印方向にｆθレンズ１４を押圧しているので光軸方向（Ｙ方向）の精度は保たれている。Ｚ方向（画面上方）への移動を規制する機構はないが、ｆθレンズ１４は副走査方向すなわち図中のＺ方向にはレンズパワーを持たず、ゆえにＺ方向に要求される位置精度は高くない。   3A is a cross-sectional view of the cross section taken along the line a in FIG. 2 as viewed from the right side of FIG. As shown in FIG. 3A, the fθ lens 14 is sandwiched between the protrusion 26 and the arm 34 and is fixed at a position where it abuts against the protrusion 26. At this time, the protrusion 26 and the arm 34 are suppressed to a height that does not interfere with the beam transmission region 28 (shaded portion). Since the arm 34 presses the fθ lens 14 in the black arrow direction, the accuracy in the optical axis direction (Y direction) is maintained. Although there is no mechanism for restricting movement in the Z direction (upward of the screen), the fθ lens 14 does not have lens power in the sub-scanning direction, that is, the Z direction in the figure, and therefore the positional accuracy required in the Z direction is not high. .

図３（ｂ）は図２を光軸方向入射側から見た側面図である。図３（ｂ）に示すように、ｆθレンズ１４は突き当てガイド２４とアーム３２によって挟持され、突き当てガイド２４に突き当たる位置で固定される。このとき突起２６とアーム３４をビームの透過領域２８（斜線部）に干渉しない高さに抑えるためにｆθレンズ１４の全高（Ｚ方向の寸法）が大きくなるが、突き当てガイド２４の高さ（Ｚ方向の寸法）がｆθレンズ１４の全高に対して十分に大きいので、ｆθレンズ１４を固定する際に回転することはない。   FIG. 3B is a side view of FIG. 2 viewed from the incident side in the optical axis direction. As shown in FIG. 3B, the fθ lens 14 is sandwiched between the abutment guide 24 and the arm 32 and is fixed at a position where it abuts against the abutment guide 24. At this time, the total height (dimension in the Z direction) of the fθ lens 14 is increased in order to suppress the protrusion 26 and the arm 34 to a height that does not interfere with the transmission region 28 (shaded portion) of the beam. Since the dimension in the Z direction) is sufficiently large with respect to the total height of the fθ lens 14, it does not rotate when the fθ lens 14 is fixed.

さらに突き当てガイド２４とｆθレンズ１４の接触抵抗によりＺ方向（画面上方）への移動を十分に規制することができるので、副走査方向（Ｚ方向）に要求される位置精度が主走査方向（Ｘ方向）、光軸方向（Ｙ方向）ほど高くない点と併せて、特に副走査方向（Ｚ方向）への移動を規制する固定部材を設けずとも必要にして十分な位置精度を保つことができる。   Furthermore, since the contact resistance between the abutment guide 24 and the fθ lens 14 can sufficiently restrict the movement in the Z direction (upward of the screen), the positional accuracy required in the sub-scanning direction (Z direction) is the main scanning direction ( In addition to the fact that it is not as high as the X direction) and the optical axis direction (Y direction), it is necessary to maintain sufficient positional accuracy without providing a fixing member that restricts movement in the sub-scanning direction (Z direction). it can.

なお、副走査方向（Ｚ方向）を規制する場合、別部材の固定バネ等でｆθレンズ１４を上部から押圧しても、ｆθレンズ１４の主走査方向の小型化、及び回転モーメントの付加させずに、ｆθレンズ１４を正しい支持位置に突き当てすることが可能である。   When the sub-scanning direction (Z direction) is restricted, even if the fθ lens 14 is pressed from above with a separate fixed spring or the like, the fθ lens 14 is not reduced in size in the main scanning direction and no rotational moment is added. In addition, the fθ lens 14 can be brought into contact with the correct support position.

また、このとき固定バネ３０はｆθレンズ１４とフレーム１１の間に挟まれる形で固定されるため、図４の従来例のように固定ねじ等は必要とせず、組み立て工数と部品点数を削減することができる。すなわち、フレーム１１とｆθレンズ１４で固定バネ３０を挟む形でｆθレンズ１４を固定するため、ｆθレンズ１４が固定バネ３０の抜け止めとなり、固定バネ３０を固定する固定ねじ等は不要となる。   At this time, since the fixing spring 30 is fixed in such a manner as to be sandwiched between the fθ lens 14 and the frame 11, no fixing screw or the like is required as in the conventional example of FIG. 4, and the number of assembly steps and the number of parts are reduced. be able to. That is, since the fθ lens 14 is fixed in such a manner that the fixing spring 30 is sandwiched between the frame 11 and the fθ lens 14, the fθ lens 14 prevents the fixing spring 30 from coming off, and a fixing screw or the like for fixing the fixing spring 30 becomes unnecessary.

なお上記実施例は光走査装置に関する実施例であるが、本発明はこれに限定されず、高い位置精度を必要とされる部材の固定方法全般に応用することができる。   In addition, although the said Example is an Example regarding an optical scanning apparatus, this invention is not limited to this, It can apply to the fixing method of the member in which a high positional accuracy is required.

本発明の第１形態に係る光走査装置を示す斜視図である。1 is a perspective view showing an optical scanning device according to a first embodiment of the present invention. 本発明の第１形態に係る光走査装置のレンズ固定機構を示す斜視図である。It is a perspective view which shows the lens fixing mechanism of the optical scanning device which concerns on the 1st form of this invention. 本発明の第１形態に係る光走査装置のレンズ固定機構を示す側面図である。It is a side view which shows the lens fixing mechanism of the optical scanning device which concerns on the 1st form of this invention. 従来の光走査装置のレンズ固定機構を示す斜視図及び断面図である。It is the perspective view and sectional drawing which show the lens fixing mechanism of the conventional optical scanning device.

符号の説明Explanation of symbols

１０ 光走査装置
１１ フレーム
１４ ｆθレンズ
２４ 突き当てガイド
２６ 突起
３０ 固定バネ
３２ アーム
３４ アーム DESCRIPTION OF SYMBOLS 10 Optical scanning device 11 Frame 14 f (theta) lens 24 Butting guide 26 Protrusion 30 Fixed spring 32 Arm 34 Arm

Claims (2)

光ビームを射出する光源と、
射出された光ビームを主走査方向に偏向させる偏向装置と、
偏向された光ビームを被走査面上に結像させる光学部品と、
前記光学部品を押圧して筐体との間で挟持する保持部材と、を備え、
前記保持部材は、前記光ビームの主走査方向に前記光学部品を押圧し前記筐体との間で挟持固定する第１保持部と、
前記光学部品の像形成領域の少なくとも二箇所で前記光ビームの通過位置から前記光ビームの副走査方向にずらした位置を押圧し、筐体との間で前記光学部品を挟持固定する第２保持部とを有することを特徴とする光走査装置。
A light source that emits a light beam;
A deflecting device for deflecting the emitted light beam in the main scanning direction;
An optical component that forms an image of the deflected light beam on the surface to be scanned;
A holding member that presses the optical component and holds it between the housing, and
The holding member presses the optical component in the main scanning direction of the light beam and clamps and fixes the optical component with the housing; and
Second holding for pressing and fixing the position of the optical beam in the sub-scanning direction of the light beam at at least two positions in the image forming area of the optical component, and sandwiching and fixing the optical component with the housing And an optical scanning device.
前記保持部材は前記光学部品と筐体との間に挟まれ筐体に固定されることを特徴とする請求項１に記載の光走査装置。 The optical scanning device according to claim 1, wherein the holding member is sandwiched between the optical component and the casing and fixed to the casing.
JP2004126703A 2004-04-22 2004-04-22 Optical scanner Pending JP2005309133A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6380514U (en) * 1986-11-14 1988-05-27
JPH05323169A (en) * 1992-05-19 1993-12-07 Ricoh Co Ltd Optical scanning device
JPH10206769A (en) * 1997-01-28 1998-08-07 Minolta Co Ltd Light beam scanning optical device
JP2002278207A (en) * 2001-03-21 2002-09-27 Ricoh Co Ltd Image forming device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6380514U (en) * 1986-11-14 1988-05-27
JPH05323169A (en) * 1992-05-19 1993-12-07 Ricoh Co Ltd Optical scanning device
JPH10206769A (en) * 1997-01-28 1998-08-07 Minolta Co Ltd Light beam scanning optical device
JP2002278207A (en) * 2001-03-21 2002-09-27 Ricoh Co Ltd Image forming device

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