JP5007717B2 - Laser scanning optical device - Google Patents

Laser scanning optical device Download PDF

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JP5007717B2
JP5007717B2 JP2008295886A JP2008295886A JP5007717B2 JP 5007717 B2 JP5007717 B2 JP 5007717B2 JP 2008295886 A JP2008295886 A JP 2008295886A JP 2008295886 A JP2008295886 A JP 2008295886A JP 5007717 B2 JP5007717 B2 JP 5007717B2
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scanning
scanning lens
lens
mirror
optical device
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JP2010122459A (en
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博喜 木下
秀成 立部
健司 竹下
浩明 菅野
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Konica Minolta Business Technologies Inc
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Description

本発明は、レーザ走査光学装置、特に、複数の光源から放射されたビームにて複数の感光体のそれぞれに画像を描画するレーザ走査光学装置に関する。   The present invention relates to a laser scanning optical apparatus, and more particularly to a laser scanning optical apparatus that draws an image on each of a plurality of photoconductors with beams emitted from a plurality of light sources.

一般に、複写機やプリンタなど電子写真方式による画像形成装置にあっては、画像情報に基づいて変調制御された光源から放射されたビームによって感光体上に画像（静電潜像）を形成するレーザ走査光学装置が搭載されている。この種のレーザ走査光学装置は、光源から放射されたビームを偏向器で主走査方向に偏向し、偏向されたビームを走査レンズを透過させて、かつ、ミラーによって光路を折り曲げ、感光体に導いている。   In general, in an electrophotographic image forming apparatus such as a copying machine or a printer, a laser that forms an image (electrostatic latent image) on a photosensitive member by a beam emitted from a light source modulated and controlled based on image information. A scanning optical device is mounted. This type of laser scanning optical device deflects a beam emitted from a light source in a main scanning direction by a deflector, transmits the deflected beam through a scanning lens, and bends an optical path by a mirror and guides it to a photoreceptor. ing.

この種のレーザ走査光学装置において、特許文献１の図４、図５に記載されているように、走査レンズをハウジングに形成した保持部とばね性を有する押圧部材とで弾性的に挟着する構造（以下、スナップフィット固定方式と称する）が提案されている。これにて、走査レンズを簡単な構成でかつ容易に固定することができる。   In this type of laser scanning optical apparatus, as described in FIGS. 4 and 5 of Patent Document 1, the scanning lens is elastically sandwiched between a holding portion formed in a housing and a pressing member having springiness. A structure (hereinafter referred to as a snap-fit fixing method) has been proposed. Thus, the scanning lens can be easily fixed with a simple configuration.

しかしながら、前記スナップフィット固定方式では、走査レンズを保持部と押圧部材の間に上方から圧入する方式であるため、走査レンズと保持部や押圧部材との間に摩擦や引っ掛りが発生すると、走査レンズが座面に確実に当接せずに浮いた状態で固定されるという不具合を生じていた。特に、複数の感光体を並置してそれぞれの感光体上に形成された単色の画像を合成するタンデム式画像形成装置にあっては、ハウジング内に複数の光路を形成するためのミラーなど多数の光学部材が走査レンズの上方に配置されるため、これらの光学部材が邪魔をして走査レンズの取付け状態を目視で確認することが困難であり、走査レンズが浮いた状態のまま固定されてしまい、所望の結像性能が得られないという問題点を生じる。
特開２００５−３５１９１４号公報 However, since the snap-fit fixing method is a method in which the scanning lens is press-fitted between the holding portion and the pressing member from above, if friction or a catch occurs between the scanning lens and the holding portion or the pressing member, scanning is performed. There has been a problem that the lens is fixed in a floating state without reliably contacting the seating surface. In particular, in a tandem type image forming apparatus that combines a plurality of photoconductors to synthesize a single color image formed on each photoconductor, a number of mirrors for forming a plurality of optical paths in the housing are provided. Since the optical members are arranged above the scanning lens, it is difficult for these optical members to obstruct and visually confirm the mounting state of the scanning lens, and the scanning lens is fixed in a floating state. As a result, the desired imaging performance cannot be obtained.
JP-A-2005-351914

そこで、本発明の目的は、スナップフィット固定方式にて走査レンズが所定の座面に当接して確実に固定されていることを容易に確認できるレーザ走査光学装置を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a laser scanning optical apparatus that can easily confirm that a scanning lens is securely fixed in contact with a predetermined seating surface by a snap-fit fixing method.

以上の目的を達成するため、本発明の一形態であるレーザ走査光学装置は、
複数の光源と、該光源から放射されたビームを主走査方向に偏向する偏向器と、偏向されたビームを複数の感光体上にそれぞれ集光させる走査レンズと、偏向されたビームを前記感光体へと導くミラーと、これらの部材を搭載したハウジングと、を備えたレーザ走査光学装置において、
少なくとも一つの走査レンズは、ハウジングに設けた座面上に副走査方向に位置決めされ、かつ、ハウジングに設けた光軸方向への規制部材と該規制部材へ走査レンズを弾性的に押圧する押圧部材とで挟着保持され、
前記規制部材には前記少なくとも一つの走査レンズの副走査方向の高さと同等の高さとなるようにボス部が形成されていること、
を特徴とする。 In order to achieve the above object, a laser scanning optical device according to an aspect of the present invention is provided.
A plurality of light sources, a deflector for deflecting the beam emitted from the light source in the main scanning direction, a scanning lens for condensing the deflected beams on the plurality of photoreceptors, and the deflected beam on the photoreceptor In a laser scanning optical device comprising a mirror that leads to a housing and a housing on which these members are mounted,
At least one scanning lens is positioned in the sub-scanning direction on a seating surface provided in the housing, and is a regulating member provided in the optical axis direction and a pressing member that elastically presses the scanning lens against the regulating member. And is held between
A boss portion is formed on the restriction member so as to have a height equivalent to the height of the at least one scanning lens in the sub-scanning direction;
It is characterized by.

前記レーザ走査光学装置において、走査レンズは規制部材と押圧部材とによって、いわゆるスナップフィット固定方式で座面上に取り付けられる。このように取り付けた状態において、目視で確認する以外に、組立て作業者が指先で走査レンズとボス部の先端面に同時に触れることにより、走査レンズが座面上に確実に保持されていることを指先の感触で確認することができる。特に、走査レンズの上方に光学部材が配置されており、このような光学部材が邪魔になって走査レンズが規制部材と押圧部材によって座面上で確実に保持されていることを視認することが困難な場合に効果的である。即ち、前記レーザ走査光学装置では、規制部材に走査レンズの副走査方向の高さと同等のボス部が形成されているため、指先の感触で走査レンズの副走査方向の高さをボス部の先端面との感触的な比較で判別することができる。また、治具を挿入して走査レンズとボス部の先端面との高さを識別するようにしてもよい。   In the laser scanning optical device, the scanning lens is mounted on the seating surface by a so-called snap-fit fixing method by a regulating member and a pressing member. In this state of attachment, in addition to visual confirmation, the assembly operator touches the scanning lens and the tip of the boss at the same time with the fingertip to ensure that the scanning lens is securely held on the seating surface. It can be confirmed by the touch of the fingertip. In particular, an optical member is disposed above the scanning lens, and it can be visually recognized that such an optical member is obstructive and the scanning lens is securely held on the seating surface by the regulating member and the pressing member. Effective in difficult cases. That is, in the laser scanning optical device, since the boss portion equivalent to the height of the scanning lens in the sub-scanning direction is formed on the regulating member, the height of the scanning lens in the sub-scanning direction is set to the tip of the boss portion by the touch of the fingertip. It can be determined by a tactile comparison with the surface. Further, a jig may be inserted to identify the height of the scanning lens and the tip surface of the boss portion.

以下、本発明に係るレーザ走査光学装置の実施例について、添付図面を参照して説明する。   Embodiments of a laser scanning optical apparatus according to the present invention will be described below with reference to the accompanying drawings.

（レーザ走査光学装置の概略構成、図１参照）
図１に本発明の一実施例であるレーザ走査光学装置１０の概略構成を示す。このレーザ走査光学装置は、並置された複数の感光体ドラム５０上に形成されたそれぞれ単色の画像を合成するタンデム式のカラー画像形成装置に搭載される。感光体ドラム５０は、Ｙ（イエロー）、Ｍ（マゼンタ）、Ｃ（シアン）、Ｂ（ブラック）の画像を形成するためのもので、本明細書において図面の符号に添付されたｙ，ｍ，ｃ，ｋの文字は対応する色を形成するための部材であることを示している。 (Schematic configuration of laser scanning optical device, see FIG. 1)
FIG. 1 shows a schematic configuration of a laser scanning optical apparatus 10 which is an embodiment of the present invention. This laser scanning optical device is mounted on a tandem color image forming apparatus that synthesizes monochromatic images formed on a plurality of photoconductor drums 50 arranged side by side. The photosensitive drum 50 is for forming an image of Y (yellow), M (magenta), C (cyan), and B (black). In this specification, y, m, The letters c and k indicate members for forming the corresponding colors.

レーザ走査光学装置１０は、ポリゴンミラー１１の前段に配置された図示しない光源光学系と、ポリゴンミラー１１の後段に配置された走査光学系１２と、光源光学系及び走査光学系１２を保持するためのハウジング１５とで構成されている。光源光学系は、光源としてＹ，Ｍ，Ｃ，Ｋの各色の画像データにて変調制御される４種のレーザダイオードと、該レーザダイオードから放射されたビームを整形してポリゴンミラー１１の偏向面に集光する光学素子にて構成されている。なお、この種の光源光学系の構成は周知であり、その説明は省略する。   The laser scanning optical device 10 holds a light source optical system (not shown) disposed in front of the polygon mirror 11, a scanning optical system 12 disposed in the subsequent stage of the polygon mirror 11, and the light source optical system and the scanning optical system 12. And a housing 15. The light source optical system has four types of laser diodes modulated and controlled by image data of each color Y, M, C, and K as light sources, and the deflection surface of the polygon mirror 11 by shaping the beam emitted from the laser diodes. It is comprised with the optical element which condenses to. Note that the configuration of this type of light source optical system is well known, and a description thereof will be omitted.

光源光学系からは４本のビームがポリゴンミラー１１の各偏向面に副走査方向ｚにそれぞれ異なる角度で斜入射される。ポリゴンミラー１１は、その回転に基づいてビームを主走査方向ｙに偏向する。このとき、各ビームＢｙ，Ｂｍ，Ｂｃ，Ｂｋごとに光軸方向ｘに対して斜入射角度に対応した角度で偏向される。   Four beams from the light source optical system are obliquely incident on the respective deflection surfaces of the polygon mirror 11 at different angles in the sub-scanning direction z. The polygon mirror 11 deflects the beam in the main scanning direction y based on the rotation. At this time, each beam By, Bm, Bc, Bk is deflected at an angle corresponding to the oblique incident angle with respect to the optical axis direction x.

走査光学系１２は、第１走査レンズ２１、第２走査レンズ２２、第３走査レンズ２３ｙ，２３ｍ，２３ｃ，２３ｋ、折返しミラー２４ｙ，２５ｙ，２４ｍ，２５ｍ，２４ｃ，２５ｃ，２４ｋにて構成されている。各ビームは第１走査レンズ２１及び第２走査レンズ２２を透過する。   The scanning optical system 12 includes a first scanning lens 21, a second scanning lens 22, third scanning lenses 23y, 23m, 23c, and 23k, and folding mirrors 24y, 25y, 24m, 25m, 24c, 25c, and 24k. Yes. Each beam passes through the first scanning lens 21 and the second scanning lens 22.

その後、ビームＢｙはミラー２４ｙで反射され、第３走査レンズ２３ｙを透過し、ミラー２５ｙで反射された後、感光体ドラム５０ｙ上で結像される。ビームＢｍはミラー２４ｍで反射され、第３走査レンズ２３ｍを透過し、ミラー２５ｍで反射された後、感光体ドラム５０ｍ上で結像される。ビームＢｃはミラー２４ｃで反射され、第３走査レンズ２３ｃを透過し、ミラー２５ｃで反射された後、感光体ドラム５０ｃ上で結像される。ビームＢｋはミラー２４ｋで反射され、第３走査レンズ２３ｋを透過した後、感光体ドラム５０ｋ上で結像される。   Thereafter, the beam By is reflected by the mirror 24y, passes through the third scanning lens 23y, is reflected by the mirror 25y, and then forms an image on the photosensitive drum 50y. The beam Bm is reflected by the mirror 24m, passes through the third scanning lens 23m, is reflected by the mirror 25m, and then forms an image on the photosensitive drum 50m. The beam Bc is reflected by the mirror 24c, passes through the third scanning lens 23c, is reflected by the mirror 25c, and then forms an image on the photosensitive drum 50c. The beam Bk is reflected by the mirror 24k, passes through the third scanning lens 23k, and then forms an image on the photosensitive drum 50k.

（走査レンズの保持構造、図２及び図３参照）
次に、第１走査レンズ２１及び第２走査レンズ２２の保持構造３０について説明する。ここでは、第２走査レンズ２２の保持構造３０について説明するが第１走査レンズ２１の保持構造についても同様である。 (Refer to FIG. 2 and FIG. 3 for holding structure of scanning lens)
Next, the holding structure 30 for the first scanning lens 21 and the second scanning lens 22 will be described. Here, the holding structure 30 of the second scanning lens 22 will be described, but the same applies to the holding structure of the first scanning lens 21.

保持構造３０は、走査レンズ２２の主走査方向ｙの両端部に位置し、ハウジング１５の床面１６に設けた座面３１と床面１６から突出した規制部材３２及び押圧部材３４とで構成されている。ハウジング１５は樹脂材にて成形されており、保持構造３０も同じ樹脂材にてハウジング１５と一体的に成形されている。一方、走査レンズ２２の両端部には位置決めのための突部２２ａが形成されている。   The holding structure 30 is located at both ends of the scanning lens 22 in the main scanning direction y, and includes a seat surface 31 provided on the floor surface 16 of the housing 15, a regulating member 32 and a pressing member 34 protruding from the floor surface 16. ing. The housing 15 is molded from a resin material, and the holding structure 30 is also molded integrally with the housing 15 from the same resin material. On the other hand, protrusions 22 a for positioning are formed at both ends of the scanning lens 22.

座面３１は、走査レンズ２２の下面２２ｂが当接する部分であり、走査レンズ２２を副走査方向ｚに位置決めするためのものである。規制部材３２は、走査レンズ２２の基準面２２ｃが当接する部分であり、走査レンズ２２を光軸方向ｘに位置決めするためのものである。押圧部材３４は、床面１６に傾斜して突設され、規制部材３２と押圧部材３４との間に走査レンズ２２の両端部が圧入されることにより、走査レンズ２２の突部２２ａを光軸方向ｘに弾性的に押圧する。これにて、走査レンズ２２は、規制部材３２と押圧部材３４との間で挟着保持され、基準面２２ｃが規制部材３２に当接することで光軸方向ｘに位置決めされる。また、走査レンズ２２は、その下面２２ｂが座面３１に当接することで副走査方向ｚに位置決めされる。走査レンズ２２はこのように位置決めされた後、接着剤にて座面３１及び／又は規制部材３２に固定される。   The seating surface 31 is a portion where the lower surface 22b of the scanning lens 22 abuts, and is for positioning the scanning lens 22 in the sub-scanning direction z. The regulating member 32 is a portion where the reference surface 22c of the scanning lens 22 abuts, and is for positioning the scanning lens 22 in the optical axis direction x. The pressing member 34 is inclined and protruded on the floor surface 16, and both end portions of the scanning lens 22 are press-fitted between the regulating member 32 and the pressing member 34, so that the protruding portion 22 a of the scanning lens 22 is made optical axis. It is elastically pressed in the direction x. As a result, the scanning lens 22 is sandwiched and held between the regulating member 32 and the pressing member 34, and the reference surface 22c comes into contact with the regulating member 32 and is positioned in the optical axis direction x. The scanning lens 22 is positioned in the sub-scanning direction z when the lower surface 22 b abuts on the seat surface 31. After the scanning lens 22 is positioned in this way, it is fixed to the seating surface 31 and / or the regulating member 32 with an adhesive.

ところで、走査レンズ２２は前記保持構造３０に上方から圧入して装着されるが、走査レンズ２２と規制部材３２や押圧部材３４との間に摩擦や引っ掛りが発生すると、走査レンズ２２が座面３１から浮いた状態で固定されてしまい、光学性能が低下する。また、接着剤が硬化するまでの間に走査レンズ２２が若干浮き上がる場合もある。そして、走査レンズ２２の上方には第３走査レンズ２３ｙやミラー２５ｙなどの光学部材が配置されているため（図１参照）、組立て作業者にとって走査レンズ２２の取付け状態を目視で確認することが困難である。   By the way, the scanning lens 22 is press-fitted and mounted on the holding structure 30 from above. However, when friction or catching occurs between the scanning lens 22 and the regulating member 32 or the pressing member 34, the scanning lens 22 is seated. It will be fixed in the state where it floated from 31, and optical performance will fall. Further, the scanning lens 22 may be slightly lifted before the adhesive is cured. Since optical members such as the third scanning lens 23y and the mirror 25y are disposed above the scanning lens 22 (see FIG. 1), it is possible for the assembly operator to visually confirm the mounting state of the scanning lens 22. Have difficulty.

このような不具合を避けるため、本実施例では、規制部材３２の上面に、走査レンズ２２の副走査方向ｚの高さと同等の高さとなるようにボス部３３を形成した。組み立てた後、作業者が指先を図１に示す矢印Ａ方向にハウジング１５に挿入し、走査レンズ２２の上面２２ｄとボス部３３の先端面３３ａに同時に触れることにより、走査レンズ２２が座面３１上に確実に保持されていることを指先の感触で確認することができる。仮に、走査レンズ２２が座面３１から浮き上がっていれば、走査レンズ２２の上面２２ｄとボス部３３の先端面３３ａとに段差ができるので、指先で容易に判別することができる。これにて、光学性能が低下した装置が検査工程へ搬送されることが未然に防止される。   In order to avoid such a problem, in this embodiment, the boss portion 33 is formed on the upper surface of the regulating member 32 so as to have a height equivalent to the height of the scanning lens 22 in the sub-scanning direction z. After the assembly, the operator inserts the fingertip into the housing 15 in the direction of arrow A shown in FIG. 1 and simultaneously touches the upper surface 22d of the scanning lens 22 and the front end surface 33a of the boss 33, whereby the scanning lens 22 is seated 31. It can be confirmed with the touch of the fingertip that it is securely held on top. If the scanning lens 22 is lifted from the seating surface 31, there is a step between the upper surface 22d of the scanning lens 22 and the tip surface 33a of the boss portion 33, so that it can be easily discriminated with the fingertip. As a result, it is possible to prevent the device having the lowered optical performance from being transported to the inspection process.

特に、走査レンズ２２の取付け状態を判別する基準をボス部３３としたのは、細いボス部３３であれば、面積の小さい先端面３３ａは精度よく樹脂成形できることによる。また、本実施例において、ボス部３３は走査レンズ２２の主走査方向ｙの両側に配置されているため、走査レンズ２２の両端部での浮き上がりを確実に確認することができる。   In particular, the reason why the boss portion 33 is used as a reference for determining the mounting state of the scanning lens 22 is that, if the boss portion 33 is thin, the tip surface 33a having a small area can be accurately resin-molded. In the present embodiment, since the boss portions 33 are arranged on both sides of the scanning lens 22 in the main scanning direction y, it is possible to surely confirm the lifting at both ends of the scanning lens 22.

走査レンズ２２とその上方に配置されている光学部材（第３走査レンズ２３ｙ）との間隔ａは、指先を前記ボス部３３に届くまで挿入できる寸法であることが必要であり、２０ｍｍ以上であることが好ましい。   The distance a between the scanning lens 22 and the optical member (the third scanning lens 23y) disposed above the scanning lens 22 needs to be a dimension that allows the fingertip to be inserted until it reaches the boss 33, and is 20 mm or more. It is preferable.

ミラー２５ｙは指先を挿入する入口部分に位置するため、指先が触れて指紋や皮油が付着しやすい。本実施例では、走査レンズ２２の上方に位置するミラー２５ｙはその鏡面部が走査レンズ２２を向かないように配置されているため、狭いスペースであっても鏡面部の汚れを回避することができる。   Since the mirror 25y is located at the entrance where the fingertip is inserted, the fingertip touches and fingerprints and skin oil tend to adhere. In the present embodiment, the mirror 25y positioned above the scanning lens 22 is disposed so that the mirror surface portion does not face the scanning lens 22, and therefore, contamination of the mirror surface portion can be avoided even in a narrow space. .

また、走査レンズ２２の取付け状態を確認するには、指先の感触による以外に、治具を挿入して確認するようにしてもよい。例えば、ストレートな定規を走査レンズ２２の上面２２ｄとボス部３３の先端面３３ａに当接させ、該定規の傾きで確認してもよい。   Moreover, in order to confirm the attachment state of the scanning lens 22, you may make it confirm by inserting a jig | tool other than by the touch of a fingertip. For example, a straight ruler may be in contact with the upper surface 22d of the scanning lens 22 and the tip surface 33a of the boss portion 33, and the inclination of the ruler may be confirmed.

（他の実施例）
なお、本発明に係るレーザ走査光学装置は前記実施例に限定するものではなく、その要旨の範囲内で種々に変更できる。 (Other examples)
The laser scanning optical device according to the present invention is not limited to the above-described embodiments, and can be variously modified within the scope of the gist thereof.

例えば、レーザ走査光学装置の光源光学系や走査光学系の構成は任意であり、光源はそれぞれの感光体にマルチビームを放射するものであってもよい。特に、走査レンズの保持構造は、ハウジングと一体的に形成する必要はなく、別体の規制部材や押圧部材（板ばね材）をハウジングに後付けしてもよい。但し、保持構造をハウジングに一体的に形成すれば、部品点数や組立工数が少なくなり、コストダウンを図ることができる。   For example, the configuration of the light source optical system and the scanning optical system of the laser scanning optical device is arbitrary, and the light source may emit a multi-beam to each photosensitive member. In particular, the scanning lens holding structure need not be formed integrally with the housing, and a separate regulating member or pressing member (leaf spring material) may be retrofitted to the housing. However, if the holding structure is formed integrally with the housing, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced.

本発明の一実施例であるレーザ走査光学装置を示す概略構成図である。It is a schematic block diagram which shows the laser scanning optical apparatus which is one Example of this invention. 走査レンズの保持構造を示す側面図である。It is a side view which shows the holding structure of a scanning lens. 走査レンズの保持構造を示す平面図である。It is a top view which shows the holding structure of a scanning lens.

符号の説明Explanation of symbols

１０…レーザ走査光学装置
１１…ポリゴンミラー
１５…ハウジング
２１，２２，２３…走査レンズ
２４，２５…ミラー
３０…保持構造
３１…座面
３２…規制部材
３３…ボス部
３４…押圧部材
５０…感光体ドラム DESCRIPTION OF SYMBOLS 10 ... Laser scanning optical apparatus 11 ... Polygon mirror 15 ... Housing 21, 22, 23 ... Scanning lens 24, 25 ... Mirror 30 ... Holding structure 31 ... Seat surface 32 ... Restriction member 33 ... Boss part 34 ... Pressing member 50 ... Photoconductor drum

Claims (5)

複数の光源と、該光源から放射されたビームを主走査方向に偏向する偏向器と、偏向されたビームを複数の感光体上にそれぞれ集光させる走査レンズと、偏向されたビームを前記感光体へと導くミラーと、これらの部材を搭載したハウジングと、を備えたレーザ走査光学装置において、
少なくとも一つの走査レンズは、ハウジングに設けた座面上に副走査方向に位置決めされ、かつ、ハウジングに設けた光軸方向への規制部材と該規制部材へ走査レンズを弾性的に押圧する押圧部材とで挟着保持され、
前記規制部材には前記少なくとも一つの走査レンズの副走査方向の高さと同等の高さとなるようにボス部が形成されていること、
を特徴とするレーザ走査光学装置。 A plurality of light sources, a deflector for deflecting the beam emitted from the light source in the main scanning direction, a scanning lens for condensing the deflected beams on the plurality of photoreceptors, and the deflected beam on the photoreceptor In a laser scanning optical device comprising a mirror that leads to a housing and a housing on which these members are mounted,
At least one scanning lens is positioned in the sub-scanning direction on a seating surface provided in the housing, and is a regulating member provided in the optical axis direction and a pressing member that elastically presses the scanning lens against the regulating member. And is held between
A boss portion is formed on the restriction member so as to have a height equivalent to the height of the at least one scanning lens in the sub-scanning direction;
A laser scanning optical device. 前記ボス部は前記少なくとも一つの走査レンズの主走査方向の両側に配置されていることを特徴とする請求項１に記載のレーザ走査光学装置。   2. The laser scanning optical apparatus according to claim 1, wherein the boss portion is disposed on both sides of the at least one scanning lens in a main scanning direction. 前記少なくとも一つの走査レンズとその上方に配置されている光学部材との間隔は約２０ｍｍ以上であることを特徴とする請求項１又は請求項２に記載のレーザ走査光学装置。   3. The laser scanning optical device according to claim 1, wherein a distance between the at least one scanning lens and an optical member disposed above the scanning lens is about 20 mm or more. 前記少なくとも一つの走査レンズの上方にはミラーが配置されており、該ミラーはその鏡面部が前記少なくとも一つの走査レンズを向かないように配置されていること、を特徴とする請求項１、請求項２又は請求項３に記載のレーザ走査光学装置。   The mirror is disposed above the at least one scanning lens, and the mirror is disposed so that the mirror surface portion does not face the at least one scanning lens. Item 4. The laser scanning optical device according to Item 2 or Item 3. 前記座面、前記規制部材及び前記押圧部材は前記ハウジングに一体的に形成されていることを特徴とする請求項１、請求項２、請求項３又は請求項４に記載のレーザ走査光学装置。   The laser scanning optical apparatus according to claim 1, wherein the seating surface, the regulating member, and the pressing member are formed integrally with the housing.
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