JP2008139349A - Optical scanning optical apparatus - Google Patents

Optical scanning optical apparatus Download PDF

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JP2008139349A
JP2008139349A JP2006322620A JP2006322620A JP2008139349A JP 2008139349 A JP2008139349 A JP 2008139349A JP 2006322620 A JP2006322620 A JP 2006322620A JP 2006322620 A JP2006322620 A JP 2006322620A JP 2008139349 A JP2008139349 A JP 2008139349A
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deflector
optical scanning
scanning optical
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Yasushi Nagasaka
泰志 長坂
Kenji Takeshita
健司 竹下
Hajime Taniguchi
元 谷口
Tsukasa Sugiura
司 杉浦
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Konica Minolta Business Technologies Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain an optical scanning optical apparatus in which the deterioration of resist performance is effectively prevented by suppressing the variation in the distortion of focusing elements due to the heat generation of a deflector as much as possible. <P>SOLUTION: The optical scanning optical apparatus is mounted on a color printer of a tandem type electronic photography method. Respective photoreceptors are exposed to four luminous fluxes By, Bm, Bc and Bk. A housing 27 has independent space parts 27a, 27c, and 27d which are partitioned by wall parts 27e, 27f, and 27g. Independent focusing lenses 33Y, 33M, 33C and 33K through which the respective luminous fluxes independently pass are arranged in the space part 27a, common focusing lenses 31 and 32 through which the respective luminous fluxes commonly pass are arranged in the space part 27c, and a polygon mirror 40 and its driving motor 42 are arranged in the space part 27d. Furthermore, a driving substrate 41 of the polygon mirror 40 is provided just above the space part 27d. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、光走査光学装置、特に、電子写真法によるタンデム方式の画像形成装置にプリントヘッドとして搭載される光走査光学装置に関する。   The present invention relates to an optical scanning optical device, and more particularly, to an optical scanning optical device mounted as a print head in a tandem image forming apparatus using electrophotography.

電子写真法によるタンデム方式のプリンタや複写機などの画像形成装置においては、色の３原色（Ｙ，Ｍ，Ｃ）と黒色（Ｋ）の画像を平行に配置された四つの感光体上に形成し、各画像を中間転写ベルト上に１次転写して合成し、さらに記録材上に２次転写するようにしている。そして、この種のタンデム方式の画像形成装置においては、例えば、特許文献１に記載の光走査光学装置が搭載されている。   In an image forming apparatus such as an electrophotographic tandem printer or copier, three primary colors (Y, M, C) and black (K) are formed on four photoconductors arranged in parallel. Each image is primarily transferred onto the intermediate transfer belt and synthesized, and then further transferred onto the recording material. In this type of tandem image forming apparatus, for example, an optical scanning optical device described in Patent Document 1 is mounted.

特許文献１に記載の光走査光学装置においては、四つの光源（レーザダイオード）から放射された光束をポリゴンミラーで偏向し、結像レンズを透過させるとともに、各光路をミラーで折り返し、四つの感光体ドラム上にそれぞれの光束を結像／走査させるように構成されている。四つの画像を中間転写ベルト上で精度よく合成するためには、四つの光路を形成する各光学素子によるそれぞれの感光体上での露光位置の精度が重要である。   In the optical scanning optical device described in Patent Document 1, light beams emitted from four light sources (laser diodes) are deflected by a polygon mirror, transmitted through an imaging lens, and each optical path is folded back by a mirror, thereby producing four photosensitive elements. Each beam is imaged / scanned on the body drum. In order to synthesize four images on the intermediate transfer belt with high accuracy, the accuracy of the exposure position on each photoconductor by each optical element forming the four optical paths is important.

この種の光走査光学装置としては、四つの光路にそれぞれ個別の結像レンズを追加したものも知られており、図７に示すように、ポリゴンミラー１００、共通結像レンズ１０１，１０２、個別結像レンズ１０３（１０３Ｙ，１０３Ｍ，１０３Ｃ，１０３Ｋ）がハウジング１１０内に設けられ、光束Ｂｙ，Ｂｍ，Ｂｃ，Ｂｋが感光体上を露光する。   As this type of optical scanning optical device, there is also known an optical imaging device in which individual imaging lenses are added to four optical paths. As shown in FIG. 7, a polygon mirror 100, common imaging lenses 101 and 102, An imaging lens 103 (103Y, 103M, 103C, 103K) is provided in the housing 110, and the light beams By, Bm, Bc, Bk expose the photosensitive member.

しかしながら、従来の光走査光学装置においては、ポリゴンミラー１００の駆動モータ１０５を制御する駆動基板１０６（特にＩＣ部品）からの発熱で特に結像レンズ１０３の歪みが原因となって、露光位置にばらつきが生じ、各色の画像のレジスト性能が劣化するという問題点を有していた。   However, in the conventional optical scanning optical device, the exposure position varies due to the heat generation from the drive substrate 106 (particularly IC component) that controls the drive motor 105 of the polygon mirror 100, particularly due to the distortion of the imaging lens 103. And the resist performance of each color image deteriorates.

このようなレジスト性能の劣化は、結像レンズ１０１，１０２，１０３がハウジング１１０内の単一の空間部に配置されており、個別結像レンズ１０３は、それぞれ、熱源からの距離が異なることに起因すると考えられる。即ち、図８に示すように、各個別レンズ１０３Ｙ，１０３Ｍ，１０３Ｃ，１０３Ｋはポリゴンミラー１００からの距離に応じて温度差を生じ、温度上昇に比例して露光位置が大きく変化することによる。   Such degradation of resist performance is caused by the fact that the imaging lenses 101, 102, and 103 are arranged in a single space in the housing 110, and that the individual imaging lenses 103 have different distances from the heat source. It is thought to be caused. That is, as shown in FIG. 8, the individual lenses 103Y, 103M, 103C, and 103K generate a temperature difference according to the distance from the polygon mirror 100, and the exposure position changes greatly in proportion to the temperature rise.

また、熱源となる駆動基板１０６がポリゴンミラー１００よりも低い位置に配置されているため、外部への放熱が困難で、温度上昇した空気流がハウジング１１０内に流れやすいこともレジスト性能の劣化を大きくしている。
特開２００４−６１７４６号公報 In addition, since the drive substrate 106 serving as a heat source is disposed at a position lower than the polygon mirror 100, it is difficult to dissipate heat to the outside, and the increased air flow easily flows into the housing 110. It is getting bigger.
JP 2004-61746 A

そこで、本発明の目的は、偏向器の発熱に起因する結像レンズの歪みのばらつきを極力抑えてレジスト性能の劣化を効果的に防止できる光走査光学装置を提供することにある。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical scanning optical device capable of effectively preventing deterioration of resist performance by minimizing variation in distortion of an imaging lens due to heat generated by a deflector.

以上の目的を達成するため、本発明に係る光走査光学装置は、
複数の光源と、該光源から放射される各光束を同一面で偏向する偏向器と、該偏向器で偏向された各光束を感光体上に結像させる結像素子と、前記光束をそれぞれに対応する前記感光体上に導くミラーと、これらの各部材を保持するハウジングと、を備え、
前記ハウジングは、前記結像素子の少なくとも一つが配置された空間部と、他の結像素子が配置された空間部とが壁部で仕切られており、
前記偏向器はその駆動基板が偏向器の偏向面よりも高い位置に配置されていること、
を特徴とする。 In order to achieve the above object, an optical scanning optical device according to the present invention includes:
A plurality of light sources, a deflector that deflects each light beam emitted from the light source on the same surface, an image forming element that forms an image on each photosensitive member deflected by the deflector, and the light beam respectively A mirror that leads onto the corresponding photoreceptor, and a housing that holds each of these members,
In the housing, a space part in which at least one of the imaging elements is arranged and a space part in which another imaging element is arranged are partitioned by a wall part,
The deflector has its drive substrate disposed at a position higher than the deflection surface of the deflector,
It is characterized by.

本発明に係る光走査光学装置において、結像素子の少なくとも一つが配置された空間部に対して、他の結像素子が配置された空間部は壁部で仕切られているため、他の結像素子への偏向器の駆動基板からの発熱の影響が極力排除され、結像レンズの温度差（熱歪み）のばらつきがほとんどなくなる。しかも、発熱源となる偏向器の駆動基板は偏向器の偏向面よりも高い位置に配置されているため、放熱効率が向上して結像素子への影響を弱めることができる。これらの作用により、各色の画像のレジスト性能の劣化が抑制される。   In the optical scanning optical device according to the present invention, the space portion in which the other imaging elements are arranged is partitioned by the wall portion with respect to the space portion in which at least one of the imaging elements is arranged. The influence of heat generated from the drive substrate of the deflector on the image element is eliminated as much as possible, and variations in the temperature difference (thermal distortion) of the imaging lens are almost eliminated. In addition, since the drive substrate of the deflector serving as a heat source is disposed at a position higher than the deflection surface of the deflector, the heat radiation efficiency can be improved and the influence on the imaging element can be weakened. By these actions, deterioration of resist performance of each color image is suppressed.

本発明に係る光走査光学装置においては、各光束が共通に透過する共通結像素子の少なくとも一つと偏向器とがハウジングの同一の空間部に配置されていてもよい。あるいは、偏向器は結像素子とは別の空間部に配置されていてもよい。また、偏向器はその駆動基板より高い位置に放熱部材を備えていることが好ましい。さらに、偏向器の上方には空気流を生じさせるための空間を有していることが好ましい。   In the optical scanning optical device according to the present invention, at least one of the common imaging elements through which the respective light beams are transmitted in common and the deflector may be disposed in the same space portion of the housing. Alternatively, the deflector may be disposed in a separate space from the imaging element. Moreover, it is preferable that the deflector includes a heat radiating member at a position higher than the drive substrate. Furthermore, it is preferable to have a space for generating an air flow above the deflector.

以下、本発明に係る光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 an optical scanning optical device according to the present invention will be described below with reference to the accompanying drawings.

（画像形成装置の全体構成、図１参照）
図１に、本発明に係る光走査光学装置を搭載したカラープリンタ１の概略構成を示す。このカラープリンタ１は、タンデム方式で４色の画像を合成するように構成されている。即ち、四つの画像形成ステーション２（２Ｙ，２Ｍ，２Ｃ，２Ｋ）の直上に中間転写ベルト１０が配置され、直下に光走査光学装置２０が配置されている。各画像形成ステーション２には、それぞれ、感光体ドラム３（３Ｙ，３Ｍ，３Ｃ，３Ｋ）、現像器４（４Ｙ，４Ｍ，４Ｃ，４Ｋ）や図示しない帯電器、残留トナーのクリーナなどが配置されている。なお、黒色の画像を形成するための画像形成ステーション２Ｋは大型に構成され、使用頻度の高いモノクロ画像を高速で形成できるようにしている。 (Overall configuration of image forming apparatus, see FIG. 1)
FIG. 1 shows a schematic configuration of a color printer 1 equipped with an optical scanning optical device according to the present invention. The color printer 1 is configured to synthesize four color images in a tandem manner. That is, the intermediate transfer belt 10 is disposed immediately above the four image forming stations 2 (2Y, 2M, 2C, 2K), and the optical scanning optical device 20 is disposed immediately below. Each image forming station 2 is provided with a photosensitive drum 3 (3Y, 3M, 3C, 3K), a developing device 4 (4Y, 4M, 4C, 4K), a charger (not shown), a residual toner cleaner, and the like. ing. Note that the image forming station 2K for forming a black image is configured in a large size so that a frequently used monochrome image can be formed at high speed.

光走査光学装置２０は、Ｙ，Ｍ，Ｃ，Ｋの画像データに基づいて放射される光束Ｂｙ，Ｂｍ，Ｂｃ，Ｂｋによって各感光体ドラム３上に画像（静電潜像）を形成する。この潜像はトナーによって可視像化される。このような電子写真プロセスは周知であり、その説明は省略する。   The optical scanning optical device 20 forms an image (electrostatic latent image) on each photosensitive drum 3 by the light beams By, Bm, Bc, and Bk emitted based on the Y, M, C, and K image data. This latent image is visualized with toner. Such an electrophotographic process is well known and will not be described.

中間転写ベルト１０は、駆動ローラ１１及び支持ローラ１２に無端状に張り渡され、矢印Ｙ方向への回転に基づいて前記各感光体ドラム３上に形成された各色のトナー画像が順次１次転写され、合成される。   The intermediate transfer belt 10 is stretched endlessly around the driving roller 11 and the support roller 12, and the toner images of the respective colors formed on the respective photosensitive drums 3 are sequentially primary-transferred based on the rotation in the arrow Y direction. And synthesized.

記録材は、自動給紙カセット５に収納されており、１枚ずつ所定のタイミングで給紙され、通紙経路６を経由して中間転写ベルト１０から２次転写位置１３にて合成トナー画像を２次転写され、定着装置１５でトナーの加熱定着を施された後、排出ローラ１６から排紙部９上に排出される。一方、両面プリントの際、記録材はスイッチバックローラ１７からプリンタ１の外方に搬送され、スイッチバックされて反転経路７を経由して２次転写位置１３に戻される。ここで裏面にトナー画像を２次転写された記録材は排出ローラ１６から排紙部９上に排出されることになる。   The recording material is stored in the automatic paper feeding cassette 5 and is fed one by one at a predetermined timing, and a composite toner image is transferred from the intermediate transfer belt 10 to the secondary transfer position 13 via the paper passing path 6. After the secondary transfer, the toner is heated and fixed by the fixing device 15, and then discharged from the discharge roller 16 onto the paper discharge unit 9. On the other hand, during double-sided printing, the recording material is conveyed from the switchback roller 17 to the outside of the printer 1, switched back, and returned to the secondary transfer position 13 via the reverse path 7. Here, the recording material on which the toner image is secondarily transferred on the back surface is discharged from the discharge roller 16 onto the paper discharge unit 9.

（光走査光学装置の概略構成、図２〜図４参照）
図２は一実施例である光走査光学装置２０の断面図、図３は平面図、図４は底面図である。この光走査光学装置２０は、光源部２１と、ポリゴンミラー４０と第１及び第２結像レンズ３１，３２と、各光路ごとに設けた折返しミラー３４，３５，３６及び第３結像レンズ３３と、これらの部材を保持するハウジング２７とで構成されている。光源部２１は、レーザダイオード２２（２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋ）と、合成ミラー２３（２３Ｙ，２３Ｍ，２３Ｃ）と、折返しミラー２４と、シリンドリカルレンズ２５とで構成され、プレート２６に搭載されている。 (Schematic configuration of optical scanning optical device, see FIGS. 2 to 4)
2 is a cross-sectional view of the optical scanning optical device 20 according to an embodiment, FIG. 3 is a plan view, and FIG. 4 is a bottom view. This optical scanning optical device 20 includes a light source unit 21, a polygon mirror 40, first and second imaging lenses 31, 32, folding mirrors 34, 35, 36 provided for each optical path, and a third imaging lens 33. And a housing 27 for holding these members. The light source unit 21 includes a laser diode 22 (22Y, 22M, 22C, 22K), a composite mirror 23 (23Y, 23M, 23C), a folding mirror 24, and a cylindrical lens 25, and is mounted on a plate 26. Yes.

レーザダイオード２２Ｋから放射された光束は折返しミラー２４に直接導かれる。また、レーザダイオード２２Ｃ，２２Ｍ，２２Ｙからそれぞれ放射された光束は、合成ミラー２３Ｃ，２３Ｍ，２３Ｙでそれぞれ反射し、折返しミラー２４に導かれる。折返しミラー２４で反射された各光束はシリンドリカルレンズ２５で副走査方向Ｚ（図２参照）にほぼ平行に集光され、ポリゴンミラー４０の同一面に副走査方向Ｚに所定の角度を有して導かれる。   The light beam emitted from the laser diode 22K is directly guided to the folding mirror 24. The light beams emitted from the laser diodes 22C, 22M, and 22Y are reflected by the combining mirrors 23C, 23M, and 23Y, respectively, and are guided to the folding mirror 24. Each light beam reflected by the folding mirror 24 is condensed by the cylindrical lens 25 substantially parallel to the sub-scanning direction Z (see FIG. 2), and has a predetermined angle in the sub-scanning direction Z on the same surface of the polygon mirror 40. Led.

これらの光束はポリゴンミラー４０の回転に基づいて主走査方向Ｘに等角速度で偏向され、第１及び第２結像レンズ３１，３２を透過した後、光束Ｂｋは第３結像レンズ３３Ｋを透過して折返しミラー３４Ｋで反射され、感光体ドラム３Ｋ上を露光／走査する。光束Ｂｃは折返しミラー３４Ｃ，３５Ｃで反射されて第３結像レンズ３３Ｃを透過し、さらに折返しミラー３６Ｃで反射され、感光体ドラム３Ｃ上を露光／走査する。光束Ｂｍは折返しミラー３４Ｍで反射されて第３結像レンズ３３Ｍを透過し、さらに折返しミラー３５Ｍで反射され、感光体ドラム３Ｍ上を露光／走査する。光束Ｂｙは折返しミラー３４Ｙで反射されて第３結像レンズ３３Ｙを透過し、さらに折返しミラー３５Ｙで反射され、感光体ドラム３Ｙ上を露光／走査する。   These light beams are deflected at a constant angular velocity in the main scanning direction X based on the rotation of the polygon mirror 40, and after passing through the first and second imaging lenses 31, 32, the light beam Bk passes through the third imaging lens 33K. Then, the light is reflected by the folding mirror 34K and exposed / scanned on the photosensitive drum 3K. The light beam Bc is reflected by the folding mirrors 34C and 35C, passes through the third imaging lens 33C, is further reflected by the folding mirror 36C, and exposes / scans the photosensitive drum 3C. The light beam Bm is reflected by the folding mirror 34M, passes through the third imaging lens 33M, is further reflected by the folding mirror 35M, and exposes / scans the photosensitive drum 3M. The light beam By is reflected by the folding mirror 34Y, is transmitted through the third imaging lens 33Y, is further reflected by the folding mirror 35Y, and exposes / scans the photosensitive drum 3Y.

ポリゴンミラー４０は、図２に示すように、プレート４４に固定したモータ４２に取り付けられている。プレート４４はさらに駆動基板４１及び放熱板４３が取り付けられている。   As shown in FIG. 2, the polygon mirror 40 is attached to a motor 42 fixed to the plate 44. The plate 44 further has a drive substrate 41 and a heat radiating plate 43 attached thereto.

また、各感光体ドラム３上での各走査線の書出し位置を検出するため、即ち、主走査同期信号を得るため、ポリゴンミラー４０で偏向された光束Ｂｋの主走査方向上流側光束は、図３に示すように、検出用ミラー３７で反射されてレンズ３８で集光され、同期信号検出用受光センサ３９に入射する。   Further, in order to detect the writing position of each scanning line on each photosensitive drum 3, that is, to obtain a main scanning synchronization signal, the upstream side beam in the main scanning direction of the beam Bk deflected by the polygon mirror 40 is As shown in FIG. 3, the light is reflected by the detection mirror 37, collected by the lens 38, and enters the sync signal detection light receiving sensor 39.

なお、ハウジング２７はカラープリンタ１の図示しないフレームに、３箇所の固定点Ｚ１，Ｚ２，Ｚ３により、例えば、ねじ止めにより固定されている（図３参照）。   The housing 27 is fixed to a frame (not shown) of the color printer 1 by, for example, screwing at three fixing points Z1, Z2, and Z3 (see FIG. 3).

さらに、色ずれ調整（レジスト調整）として、図３に示すように、部分倍率調整機構４５とスキュー調整機構５０が設置されている。スキュー調整機構５０は駆動源としてブラケット５９を介してハウジング２７に固定されたステッピングモータ５１を備えている。なお、部分倍率調整機構４５及びスキュー調整機構５０の詳細な説明は省略する。   Further, as shown in FIG. 3, a partial magnification adjustment mechanism 45 and a skew adjustment mechanism 50 are installed as color misregistration adjustment (registration adjustment). The skew adjustment mechanism 50 includes a stepping motor 51 fixed to the housing 27 via a bracket 59 as a drive source. Detailed description of the partial magnification adjustment mechanism 45 and the skew adjustment mechanism 50 will be omitted.

（第１実施例、図５参照）
本発明に係る光走査光学素子の第１実施例を図５に示す。本第１実施例は、ハウジング２７に壁部２７ｅ，２７ｆで仕切られた空間部２７ａ，２７ｂが形成されている。空間部２７ａには、各光束が個別に透過する結像レンズ３３Ｙ，３３Ｍ，３３Ｃ，３３Ｋや折返しミラー３４Ｙ，３４Ｍ，３４Ｃ，３４Ｋ，３５Ｙ，３５Ｍ，３５Ｃ，３６Ｃが配置されている。空間部２７ｂには、ポリゴンミラー４０やその駆動モータ４２が配置されるとともに、各光束が共通に透過する結像レンズ３１，３２が配置されている。壁部２７ｅには光束を通過させるために窓部２７ｅ’が形成され、窓部２７ｅ’には断熱のために透明なガラス板（図示せず）が固定されている。また、ハウジング２７の底面は補強用のカバー２７ｈにて閉じられている。 (Refer to the first embodiment, FIG. 5)
FIG. 5 shows a first embodiment of the optical scanning optical element according to the present invention. In the first embodiment, the housing 27 is formed with space portions 27a and 27b partitioned by wall portions 27e and 27f. In the space portion 27a, imaging lenses 33Y, 33M, 33C, and 33K through which each light beam is individually transmitted and folding mirrors 34Y, 34M, 34C, 34K, 35Y, 35M, 35C, and 36C are arranged. In the space portion 27b, a polygon mirror 40 and its drive motor 42 are disposed, and imaging lenses 31 and 32 through which the respective light beams are transmitted in common are disposed. A window portion 27e ′ is formed in the wall portion 27e to allow a light beam to pass therethrough, and a transparent glass plate (not shown) is fixed to the window portion 27e ′ for heat insulation. The bottom surface of the housing 27 is closed by a reinforcing cover 27h.

ポリゴンミラー４０に関しては、プレート４４の下面にモータ４２が取り付けられ、上面にＩＣ部品を含む駆動基板４１が取り付けられている。駆動基板４１は主にＩＣ部品が発熱するため、空間部２７ｂの外側に配置され、さらに放熱板４３が設置されている。   As for the polygon mirror 40, a motor 42 is attached to the lower surface of the plate 44, and a drive substrate 41 including IC components is attached to the upper surface. Since the drive substrate 41 mainly generates heat from IC components, the drive substrate 41 is disposed outside the space 27b, and a heat sink 43 is further provided.

なお、部分倍率調整機構４５及びスキュー調整機構５０は空間部２７ａに収容してもよく、あるいは、他に形成した空間部に収容してもよい。   The partial magnification adjustment mechanism 45 and the skew adjustment mechanism 50 may be accommodated in the space portion 27a, or may be accommodated in other formed space portions.

以上の構成において、共通結像レンズ３１，３２が配置された空間部２７ｂに対して、個別結像レンズ３３が配置された空間部２７ａは壁部２７ｅ，２７ｆで仕切られているため、各個別結像レンズ３３への駆動基板４１からの発熱の影響が極力排除され、個別結像レンズ３３ごとの温度差（熱歪み）のばらつきがほとんどなくなる。即ち、図８に示した温度差による露光位置の変化がほとんど解消され、各色の画像のレジスト性能の劣化が抑制される。   In the above configuration, since the space portion 27a in which the individual imaging lens 33 is disposed is partitioned by the wall portions 27e and 27f with respect to the space portion 27b in which the common imaging lenses 31 and 32 are disposed, The influence of heat generation from the drive substrate 41 on the imaging lens 33 is eliminated as much as possible, and variations in temperature difference (thermal distortion) for each individual imaging lens 33 are almost eliminated. That is, the change in exposure position due to the temperature difference shown in FIG. 8 is almost eliminated, and deterioration of resist performance of each color image is suppressed.

しかも、発熱源となる駆動基板４１はポリゴンミラー４０の偏向面よりも高い位置に配置されているため、熱がハウジング２７内に拡散しにくく、かつ、放熱効率が向上するため、結像レンズ３１，３２，３３への影響を弱めることができる。なお、共通結像レンズ３１，３２は各光束が共通して透過し、レンズ３１，３２に生じる熱歪みの影響は各光束に共通に作用するため、レジスト性能にはそれほど影響することはない。   In addition, since the drive substrate 41 serving as a heat source is disposed at a position higher than the deflection surface of the polygon mirror 40, heat is not easily diffused into the housing 27, and the heat radiation efficiency is improved. , 32, 33 can be weakened. The common imaging lenses 31 and 32 transmit each light beam in common, and the influence of thermal distortion generated in the lenses 31 and 32 acts on each light beam in common, so that the resist performance is not significantly affected.

また、駆動基板４１の直上には放熱板４３が配置されているため、放熱性が良好である。そして、放熱板４３の周囲の空間（点線で囲った空間Ａ）には空気流が生じ、放熱性がより向上する。ファンなどを設けて空間Ａに強制的な空気流を発生させると効果的である。   Further, since the heat radiating plate 43 is disposed immediately above the drive substrate 41, the heat dissipation is good. And an air flow arises in the space around the heat sink 43 (space A surrounded by a dotted line), and the heat dissipation is further improved. It is effective to provide a fan or the like to generate a forced air flow in the space A.

（第２実施例、図６参照）
本発明に係る光走査光学素子の第２実施例を図６に示す。本第２実施例は、基本的には前記第１実施例と同様の構成を備え、異なるのは、前記空間部２７ｂを、壁部２７ｇで仕切られた空間部２７ｃと空間部２７ｄとで構成した点にある。空間部２７ｃには共通結像レンズ３１，３２が配置され、空間部２７ｄにはポリゴンミラー４０やその駆動モータ４２が配置されている。また、壁部２７ｇには光束を通過させるために窓部２７ｇ’が形成され、窓部２７ｇ’には断熱のために透明なガラス板（図示せず）が固定されている。 (Refer to the second embodiment, FIG. 6)
FIG. 6 shows a second embodiment of the optical scanning optical element according to the present invention. The second embodiment basically has the same configuration as that of the first embodiment except that the space 27b is composed of a space 27c and a space 27d partitioned by a wall 27g. It is in the point. Common imaging lenses 31 and 32 are disposed in the space portion 27c, and a polygon mirror 40 and its drive motor 42 are disposed in the space portion 27d. Further, a window portion 27g ′ is formed in the wall portion 27g to allow a light beam to pass therethrough, and a transparent glass plate (not shown) is fixed to the window portion 27g ′ for heat insulation.

本第２実施例の作用効果は前記第１実施例と同じであり、加えて、共通結像レンズ３１，３２にも駆動基板４１からの熱影響が及びにくくなり、空間部２７ｄの温度に対して空間部２７ｃの温度が低くなり、空間部２７ａの温度はさらに低くなる。   The operational effects of the second embodiment are the same as those of the first embodiment. In addition, the common imaging lenses 31 and 32 are less likely to be affected by heat from the drive substrate 41, and the temperature of the space portion 27d is reduced. Thus, the temperature of the space portion 27c is lowered, and the temperature of the space portion 27a is further lowered.

（他の実施例）
なお、本発明に係る光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することができる。 (Other examples)
The optical 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.

特に、ハウジングの細部の構成、光源部の構成の詳細、四つの光路を形成する各種光学素子の構成や配置は本発明の範囲内で任意である。   In particular, the detailed configuration of the housing, the detailed configuration of the light source unit, and the configuration and arrangement of various optical elements forming the four optical paths are arbitrary within the scope of the present invention.

本発明に係る光走査光学装置を備えたカラープリンタを示す概略構成図である。1 is a schematic configuration diagram illustrating a color printer including an optical scanning optical device according to the present invention. 光走査光学装置を示す断面図である。It is sectional drawing which shows an optical scanning optical apparatus. 光走査光学装置を示す平面図である。It is a top view which shows an optical scanning optical apparatus. 光走査光学装置を示す底面図である。It is a bottom view which shows an optical scanning optical apparatus. 第１実施例である光走査光学装置の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the optical scanning optical apparatus which is 1st Example. 第２実施例である光走査光学装置の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the optical scanning optical apparatus which is 2nd Example. 従来の光走査光学装置の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the conventional optical scanning optical apparatus. 個別結像レンズの温度差による露光位置変化量を示すグラフである。It is a graph which shows the exposure position change amount by the temperature difference of an individual image formation lens.

符号の説明Explanation of symbols

３（３Ｙ，３Ｍ，３Ｃ，３Ｋ）…感光体ドラム
２０…光走査光学装置
２１…光源部
２７…ハウジング
２７ａ，２７ｂ，２７ｃ，２７ｄ…空間部
２７ｅ，２７ｆ，２７ｇ…壁部
３１，３２…共通結像レンズ
３３（Ｙ，Ｍ，Ｃ，Ｋ）…個別結像レンズ
３４，３５，３６…折返しミラー
４０…ポリゴンミラー
４１…駆動基板
４２…駆動モータ
４３…放熱板 3 (3Y, 3M, 3C, 3K) ... photosensitive drum 20 ... optical scanning optical device 21 ... light source 27 ... housing 27a, 27b, 27c, 27d ... space 27e, 27f, 27g ... wall 31, 32 ... common Imaging lens 33 (Y, M, C, K) ... Individual imaging lens 34, 35, 36 ... Folding mirror 40 ... Polygon mirror 41 ... Drive substrate 42 ... Drive motor 43 ... Heat sink

Claims (5)

複数の光源と、該光源から放射される各光束を同一面で偏向する偏向器と、該偏向器で偏向された各光束を感光体上に結像させる結像素子と、前記光束をそれぞれに対応する前記感光体上に導くミラーと、これらの各部材を保持するハウジングと、を備え、
前記ハウジングは、前記結像素子の少なくとも一つが配置された空間部と、他の結像素子が配置された空間部とが壁部で仕切られており、
前記偏向器はその駆動基板が偏向器の偏向面よりも高い位置に配置されていること、
を特徴とする光走査光学装置。 A plurality of light sources, a deflector that deflects each light beam emitted from the light source on the same surface, an image forming element that forms an image on each photosensitive member deflected by the deflector, and the light beam respectively A mirror that leads onto the corresponding photoreceptor, and a housing that holds each of these members,
In the housing, a space part in which at least one of the imaging elements is arranged and a space part in which another imaging element is arranged are partitioned by a wall part,
The deflector has its drive substrate disposed at a position higher than the deflection surface of the deflector,
An optical scanning optical device. 各光束が共通に透過する共通結像素子の少なくとも一つと前記偏向器とが前記ハウジングの同一の空間部に配置されていることを特徴とする請求項１に記載の光走査光学装置。   2. The optical scanning optical device according to claim 1, wherein at least one of the common imaging elements through which each light beam is transmitted in common and the deflector are arranged in the same space of the housing. 前記偏向器は前記結像素子とは別の空間部に配置されていることを特徴とする請求項１に記載の光走査光学装置。   The optical scanning optical apparatus according to claim 1, wherein the deflector is disposed in a space part different from the imaging element. 前記偏向器は前記駆動基板より高い位置に放熱部材を備えていることを特徴とする請求項１ないし請求項３のいずれかに記載の光走査光学装置。   4. The optical scanning optical apparatus according to claim 1, wherein the deflector includes a heat radiating member at a position higher than the drive substrate. 前記偏向器の上方には空気流を生じさせるための空間を有していることを特徴とする請求項１ないし請求項４のいずれかに記載の光走査光学装置。   5. The optical scanning optical device according to claim 1, wherein a space for generating an air flow is provided above the deflector.
JP2006322620A 2006-11-29 2006-11-29 Optical scanning optical apparatus Pending JP2008139349A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012145665A (en) * 2011-01-11 2012-08-02 Ricoh Co Ltd Optical scanner and image forming device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012145665A (en) * 2011-01-11 2012-08-02 Ricoh Co Ltd Optical scanner and image forming device

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