JP2007192949A - Optical scanner - Google Patents

Optical scanner Download PDF

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JP2007192949A
JP2007192949A JP2006009374A JP2006009374A JP2007192949A JP 2007192949 A JP2007192949 A JP 2007192949A JP 2006009374 A JP2006009374 A JP 2006009374A JP 2006009374 A JP2006009374 A JP 2006009374A JP 2007192949 A JP2007192949 A JP 2007192949A
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imaging lens
folding mirror
mirror
light beam
optical
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JP4965860B2 (en
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Kenichi Tomita
健一 冨田
Akihiro Fukutomi
章宏 福冨
Masaki Sato
正樹 佐藤
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Canon Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To make an optical scanner compact without spoiling assembling property by disposing a turning back mirror close to an imaging lens. <P>SOLUTION: The optical scanner 1 has: the turning back mirror 8 which reflects a luminous flux 3 deflected and scanned with a rotary polygon mirror 4; and an imaging lens 9 which forms the image of the luminous flux 3 onto a photoreceptor drum 10, wherein the turning back mirror 8 is disposed close to the imaging lens 9 so as to cover the lens 9, and a part covering adhesion part 9G where the imaging lens 9 is adhered to the optical box 5 in the turning back mirror 8, is so composed to pass through a light beam L. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、光束を出射して像担持体を露光する光学走査装置に関する。   The present invention relates to an optical scanning device that emits a light beam to expose an image carrier.

従来、電荷を帯びた感光体上に画像情報に応じて変調された光ビームを走査露光して静電潜像を形成し、現像、転写、定着という電子写真プロセスにより画像を得るデジタル複写機、プリンタが広く用いられている。同様に、イエロー（Ｙ）、マゼンタ（Ｍ）、シアン（Ｃ）、ブラック（Ｋ）に対応する画像信号に対して帯電、露光、現像を行いこれらを重ね合わせて転写することでフルカラー画像を形成するフルカラー複写機、カラープリンタも広く使用されている。近年、このようなフルカラー画像形成装置においては、各現像色（Ｙ、Ｍ、Ｃ、Ｋ）に対応する画像形成部を直列に配置し、転写像を逐次重ね合わせて１パスでフルカラー画像を形成する、いわゆるタンデム方式が普及している。   Conventionally, a digital copier that scans and exposes a light beam modulated in accordance with image information on a charged photoreceptor to form an electrostatic latent image, and obtains an image by an electrophotographic process of development, transfer, and fixing, Printers are widely used. Similarly, a full-color image is formed by charging, exposing and developing image signals corresponding to yellow (Y), magenta (M), cyan (C), and black (K) and transferring them in an overlapping manner. Full color copiers and color printers are also widely used. In recent years, in such a full-color image forming apparatus, an image forming unit corresponding to each development color (Y, M, C, K) is arranged in series, and transfer images are sequentially superimposed to form a full-color image in one pass. The so-called tandem method is widely used.

これらの画像形成装置に使用される光学走査装置では、光束を反射する折り返しミラーと、折り返された光束を像担持体上に結像させる結像レンズとを有する。ここで、光学走査装置の中には、光束が折り返しミラーを通過した後に結像レンズを通過するものがある（例えば、特許文献１参照）。   Optical scanning devices used in these image forming apparatuses include a folding mirror that reflects a light beam and an imaging lens that forms an image of the folded light beam on an image carrier. Here, in some optical scanning devices, a light beam passes through an imaging lens after passing through a folding mirror (see, for example, Patent Document 1).

このような装置において小型化を図る場合、折り返しミラーと結像レンズとを近接させて固定配設することで、装置の小型化を図っている。特にタンデム式の場合は、複数の光学部品を使用するため、小型化のためには、折り返しミラーと結像レンズとをより近接させることが必要となる。このため、結像レンズを折り返しミラーが覆う（オーバーラップする）ような位置関係となる場合がある。   When miniaturization is attempted in such an apparatus, the apparatus is miniaturized by fixing and arranging the folding mirror and the imaging lens close to each other. In particular, in the case of the tandem type, since a plurality of optical components are used, it is necessary to bring the folding mirror and the imaging lens closer to each other in order to reduce the size. For this reason, there may be a positional relationship in which the imaging lens is covered (overlapped) by the folding mirror.

特開２００４−１１７８６５（図１）Japanese Patent Application Laid-Open No. 2004-117865 (FIG. 1)

しかしながら、折り返しミラーと結像レンズとを接近させて配設する場合に、折り返しミラーが結像レンズを覆う位置にあると、結像レンズの筐体への固定作業が困難となる場合がある。次に、具体的に説明する。   However, when the folding mirror and the imaging lens are arranged close to each other, if the folding mirror is at a position covering the imaging lens, it may be difficult to fix the imaging lens to the housing. Next, a specific description will be given.

通常、結像レンズを装置筐体に接着する際には、紫外線硬化型の接着剤を結像レンズの接着部に塗布し、紫外線を含む光を外部から照射する。これにより、結像レンズに塗布された接着剤が装置筐体との間で硬化し、結像レンズが装置筐体に接着する。   Normally, when the imaging lens is bonded to the apparatus housing, an ultraviolet curable adhesive is applied to the bonding portion of the imaging lens, and light including ultraviolet rays is irradiated from the outside. As a result, the adhesive applied to the imaging lens is cured with the apparatus housing, and the imaging lens adheres to the apparatus housing.

このため、結像レンズを接着するための接着剤の位置を覆うように折り返しミラーが配設されていると、折り返しミラーが外部からの光を遮り、光が結像レンズに塗布された接着剤に直接当たらなくなってしまう。すると、結像レンズの装置筐体への接着が十分に行われないおそれがある。   For this reason, when the folding mirror is disposed so as to cover the position of the adhesive for bonding the imaging lens, the folding mirror blocks the light from the outside, and the adhesive is applied to the imaging lens. If it hits directly, it will disappear. Then, there is a possibility that the imaging lens is not sufficiently adhered to the apparatus housing.

また、走査線を観測しながら結像レンズを調整して固定する場合には、折り返しミラーに近接させることが困難となる。このため、装置筐体の裏面（装置筐体を挟んで、折り返しミラーが配設される面と反対側の面）に結像レンズを配置する方法もある。しかしこの場合、組立性が大幅に悪化するという問題がある。   In addition, when the imaging lens is adjusted and fixed while observing the scanning line, it is difficult to bring the lens close to the folding mirror. For this reason, there is also a method in which the imaging lens is disposed on the back surface of the apparatus housing (the surface opposite to the surface on which the folding mirror is disposed across the apparatus housing). However, in this case, there is a problem that the assemblability is greatly deteriorated.

本発明の目的は、組立性を高く維持しつつ、折り返しミラーと結像レンズとを近接させて配設し、装置の小型化を行うことである。   An object of the present invention is to reduce the size of the apparatus by arranging the folding mirror and the imaging lens close to each other while maintaining high assemblability.

前記目的を達成するための本発明に係る代表的な構成は、
回転多面鏡によって偏向走査される光束を反射する反射鏡と、前記光束を被走査面に結像させる結像レンズと、を有する光学走査装置において、
前記反射鏡は、前記結像レンズを覆うように該結像レンズと近接して配設され、
前記反射鏡における前記結像レンズが装置筐体に接着される接着部を覆う部分は、光を透過するように構成されることを特徴とする。 A typical configuration according to the present invention for achieving the above object is as follows:
In an optical scanning device having a reflecting mirror that reflects a light beam deflected and scanned by a rotating polygon mirror, and an imaging lens that forms an image of the light beam on a surface to be scanned.
The reflecting mirror is disposed in proximity to the imaging lens so as to cover the imaging lens;
A portion of the reflecting mirror that covers the bonding portion where the imaging lens is bonded to the apparatus housing is configured to transmit light.

以上のように、反射鏡と結像レンズとを装置筐体の同じ側の面に配設することができるため、組立性を犠牲にすることがない。また、同じ側の面に配設して、反射鏡が結像レンズを覆う状態になっても、反射鏡の結像レンズを覆う部分は光を透過するように構成されている。このため、反射鏡と結像レンズとを近接させて配設させても、結像レンズの組み付けが可能となる。このように、反射鏡と結像レンズとを近接させて配設することができるため、装置全体の小型化を図ることができる。   As described above, since the reflecting mirror and the imaging lens can be disposed on the same surface of the apparatus housing, the assembling property is not sacrificed. Moreover, even if it arrange | positions on the surface of the same side and a reflective mirror will be in the state which covers an imaging lens, the part which covers the imaging lens of a reflective mirror is comprised so that light may permeate | transmit. For this reason, the imaging lens can be assembled even if the reflecting mirror and the imaging lens are arranged close to each other. As described above, since the reflecting mirror and the imaging lens can be disposed close to each other, the entire apparatus can be reduced in size.

図を用いて本発明の一実施例を説明する。   An embodiment of the present invention will be described with reference to the drawings.

（画像形成装置50）
図４を用いて画像形成装置50の概略構成を説明する。図４は画像形成装置の構成を説明するための概略断面図である。 (Image forming device 50)
A schematic configuration of the image forming apparatus 50 will be described with reference to FIG. FIG. 4 is a schematic cross-sectional view for explaining the configuration of the image forming apparatus.

図４に示すように、画像形成装置50は、シアンＣ、イエローＹ、マゼンタＭ、ブラックＫの各色に対応する被走査面としての感光体ドラム10Ｃ、10Ｙ、10Ｍ、10Ｋを有する。感光体ドラム10Ｃ、10Ｙ、10Ｍ、10Ｋの周辺には、静電潜像を形成するための光束３Ｃ、３Ｙ、３Ｍ、３Ｋを出射する光学走査装置１（１Ａ、１Ｂ）や、静電潜像をトナー像に現像するための現像装置51Ｃ、51Ｙ、51Ｍ、51Ｋ等を有する。また、感光体ドラム10の下部には、各色のトナー像が重畳転写される転写ベルト52を有する。   As shown in FIG. 4, the image forming apparatus 50 includes photosensitive drums 10 </ b> C, 10 </ b> Y, 10 </ b> M, and 10 </ b> K as scanning surfaces corresponding to cyan C, yellow Y, magenta M, and black K colors. Around the photosensitive drums 10C, 10Y, 10M, and 10K, an optical scanning device 1 (1A, 1B) that emits light beams 3C, 3Y, 3M, and 3K for forming an electrostatic latent image, and an electrostatic latent image Development devices 51C, 51Y, 51M, 51K and the like for developing the toner image. Further, below the photosensitive drum 10, a transfer belt 52 on which toner images of respective colors are superimposed and transferred is provided.

画像形成の際には、上記構成により転写ベルト52上に重畳転写されたトナー像が転写部54に搬送され、給送カセット53から給送される転写材Ｐに対して転写される。転写材Ｐに転写されたトナー像は、定着部55にて加圧・加熱が行われ、転写材Ｐに対して定着が行われる。その後、転写材Ｐが画像形成装置外部の排出部56に排出されることで、画像形成動作が完了する。   At the time of image formation, the toner image superimposed and transferred on the transfer belt 52 by the above configuration is conveyed to the transfer unit 54 and transferred to the transfer material P fed from the feeding cassette 53. The toner image transferred to the transfer material P is pressed and heated by the fixing unit 55, and the transfer material P is fixed. Thereafter, the transfer material P is discharged to the discharge unit 56 outside the image forming apparatus, whereby the image forming operation is completed.

（光学走査装置１）
図１を用いて光学走査装置１概略構成を説明する。図１は光学走査装置の構成を説明するための斜視図である。尚、光学走査装置１Ａ、１Ｂは同じ構成であるため、以下の説明においては、Ａ、Ｂ等の添え字を省略する。 (Optical scanning device 1)
The schematic configuration of the optical scanning device 1 will be described with reference to FIG. FIG. 1 is a perspective view for explaining the configuration of the optical scanning device. Since the optical scanning devices 1A and 1B have the same configuration, subscripts such as A and B are omitted in the following description.

図１に示すように、光学走査装置１は、光束３を発生させるレーザ光源ユニット２と、光束３を回転多面鏡４にて偏向走査する光偏向器６と、光束３を感光体ドラム10に導き結像させる走査レンズ７、折り返しミラー（反射鏡）８及び結像レンズ９等を有する。また、これらの光学部品は、装置筐体である光学箱５に組みつけられる。このような構成により、光学走査装置１は次のように光束３を走査する。   As shown in FIG. 1, the optical scanning device 1 includes a laser light source unit 2 that generates a light beam 3, an optical deflector 6 that deflects and scans the light beam 3 with a rotary polygon mirror 4, and the light beam 3 on a photosensitive drum 10. It has a scanning lens 7 for guiding and forming an image, a folding mirror (reflecting mirror) 8, an imaging lens 9, and the like. Moreover, these optical components are assembled | attached to the optical box 5 which is an apparatus housing | casing. With such a configuration, the optical scanning device 1 scans the light beam 3 as follows.

レーザ光源ユニット２から出射したレーザビーム３は、まず、回転多面鏡４の反射面４ａに集光される。ここで、光束３は、光偏向器６によって回転駆動される回転多面鏡４により、偏向走査される。偏向された光束３は、走査レンズ７を通過後、折り返しミラー８によって反射され、結像レンズ９を通過して感光体ドラム10上に集光、走査される。これにより、感光体ドラム10上に静電潜像が形成される。   The laser beam 3 emitted from the laser light source unit 2 is first focused on the reflecting surface 4 a of the rotary polygon mirror 4. Here, the light beam 3 is deflected and scanned by a rotary polygon mirror 4 that is rotationally driven by an optical deflector 6. The deflected light beam 3 passes through the scanning lens 7, is reflected by the folding mirror 8, passes through the imaging lens 9, and is condensed and scanned on the photosensitive drum 10. As a result, an electrostatic latent image is formed on the photosensitive drum 10.

（折り返しミラー８及び結像レンズ９の構成）
図２及び図３を用いて、折り返しミラー８及び結像レンズ９の構成を詳細に説明する。図２は折り返しミラー８及び結像レンズ９の位置関係を説明する側断面図である。図２において、断面は折り返しミラー８の座面５ｂを含む平面と、結像レンズ９の座面５ａを含む平面を模式的に一つの図で示している。また、図３は折り返しミラー及び結像レンズの位置関係を説明する拡大斜視図である。 (Configuration of folding mirror 8 and imaging lens 9)
The configuration of the folding mirror 8 and the imaging lens 9 will be described in detail with reference to FIGS. FIG. 2 is a side sectional view for explaining the positional relationship between the folding mirror 8 and the imaging lens 9. In FIG. 2, the cross section schematically shows a plane including the seating surface 5 b of the folding mirror 8 and a plane including the seating surface 5 a of the imaging lens 9 in one view. FIG. 3 is an enlarged perspective view for explaining the positional relationship between the folding mirror and the imaging lens.

図２に示すように、結像レンズ９を光学箱５に組み付ける際には、光学箱５の表面（折り返しミラー８が配設される面と同じ面）にある座面５ａに対して矢印Ａの方向から積載される。尚、光学箱５の座面５ａの近傍の接着部９Ｇには、紫外線硬化性の接着剤が予め塗布されている。このため、後述するように、紫外線等の光線Ｌを照射することで、接着部９Ｇの接着剤が硬化し、結像レンズ９が光学箱５に固定される。   As shown in FIG. 2, when the imaging lens 9 is assembled to the optical box 5, the arrow A with respect to the seating surface 5 a on the surface of the optical box 5 (the same surface as the surface on which the folding mirror 8 is disposed). It is loaded from the direction. Note that an ultraviolet curable adhesive is applied in advance to the adhesive portion 9G in the vicinity of the seating surface 5a of the optical box 5. For this reason, as will be described later, by irradiating light L such as ultraviolet rays, the adhesive of the adhesive portion 9G is cured, and the imaging lens 9 is fixed to the optical box 5.

折り返しミラー８を光学箱５に組み付ける際も、光学箱５の表面にある座面５ｂに対して矢印Ａの方向から積載される。折り返しミラー８は、板バネ状の付勢部材11によって光学箱５に固定される。   When the folding mirror 8 is assembled to the optical box 5, it is loaded from the direction of the arrow A on the seating surface 5 b on the surface of the optical box 5. The folding mirror 8 is fixed to the optical box 5 by a leaf spring-like biasing member 11.

図３を用いて、光学箱５の座面５ａと座面５ｂの位置関係を説明する。図３に示すように、折り返しミラー８と結像レンズ９とは、光学走査装置１の高さを低くするように、近接して配設されている。また、結像レンズ９の座面５ａは、折り返しミラー８の座面５ｂよりも結像レンズ９の内側に配置されている。また、折り返しミラー８は結像レンズ９よりも主走査方向（折り返しミラー８及び結像レンズ９の長手方向）に長い。このように、結像レンズ９の接着部９Ｇの上部には、折り返しミラー８が覆うように（オーバーラップするように）近接して配設されている。   The positional relationship between the seating surface 5a and the seating surface 5b of the optical box 5 will be described with reference to FIG. As shown in FIG. 3, the folding mirror 8 and the imaging lens 9 are disposed close to each other so as to reduce the height of the optical scanning device 1. Further, the seating surface 5 a of the imaging lens 9 is disposed inside the imaging lens 9 with respect to the seating surface 5 b of the folding mirror 8. The folding mirror 8 is longer than the imaging lens 9 in the main scanning direction (longitudinal direction of the folding mirror 8 and the imaging lens 9). In this manner, the upper part of the bonding portion 9G of the imaging lens 9 is disposed close to the folding mirror 8 so as to cover (overlapping).

従来であれば、このように、折り返しミラー８が結像レンズ９の上部を覆うように近接して配設されていると、折り返しミラー８が外部から照射される光線を遮ってしまっていた。この場合、接着部９Ｇにある接着剤が十分に硬化せず、結像レンズ９の固定が完全になされない場合もあった。   Conventionally, when the folding mirror 8 is arranged so as to cover the upper part of the imaging lens 9 as described above, the folding mirror 8 blocks the light beam irradiated from the outside. In this case, the adhesive in the bonding portion 9G is not sufficiently cured, and the imaging lens 9 may not be completely fixed.

本実施例においては、外部から照射される光線Ｌが、折り返しミラー８を透過するような構成とする。このため、折り返しミラー８と結像レンズ９とが近接して配設され、折り返しミラー８が結像レンズ９を覆う場合であっても、接着剤を硬化させることができる。次に具体的に説明する。   In this embodiment, the configuration is such that the light beam L irradiated from the outside passes through the folding mirror 8. For this reason, even when the folding mirror 8 and the imaging lens 9 are disposed close to each other and the folding mirror 8 covers the imaging lens 9, the adhesive can be cured. Next, a specific description will be given.

通常、折り返しミラーの反射面は、ガラス等の透明な部材に対し、金属膜を蒸着することで構成される。ここで、本実施例の折り返しミラー８は、結像レンズ９の接着部９Ｇの上方を覆う部分（図３の斜線を施した部分）に反射面８Ｍを設けないように構成する。   Usually, the reflection surface of a folding mirror is comprised by vapor-depositing a metal film with respect to transparent members, such as glass. Here, the folding mirror 8 of the present embodiment is configured such that the reflecting surface 8M is not provided in the portion (the hatched portion in FIG. 3) that covers the upper side of the bonding portion 9G of the imaging lens 9.

このように構成すれば、照射される光線Ｌは、蒸着されて形成された反射面で遮られることがない。すると、光線Ｌは、折り返しミラー８の透明な部材の面（透過面８Ｎ）を透過することとなり、接着部９Ｇの接着剤が十分に硬化する。尚、光束３が回転多面鏡４により走査される部分（図３の黒塗りの部分）には全て、反射面８Ｍが形成される。   If comprised in this way, the light ray L irradiated will not be interrupted | blocked by the reflective surface formed by vapor deposition. Then, the light beam L is transmitted through the surface of the transparent member of the folding mirror 8 (transmission surface 8N), and the adhesive of the bonding portion 9G is sufficiently cured. Note that a reflection surface 8M is formed in all portions where the light beam 3 is scanned by the rotary polygon mirror 4 (the black portions in FIG. 3).

折り返しミラー８の光束３を反射する面において、反射面８Ｍと透過面８Ｎとを形成する方法は、次の通りである。即ち、上述のように、反射面は、透明部材に対して蒸着によ金属膜を形成することで得られる。この際に、折り返しミラー８の所定の端部をマスキングする。すると、マスキングしない中央部には、金属膜が蒸着形成されて反射面８Ｍとなり、マスキングした端部には金属膜が形成されずに透明な状態のままとなって透過面８Ｎとなる。   A method of forming the reflecting surface 8M and the transmitting surface 8N on the surface of the folding mirror 8 that reflects the light beam 3 is as follows. That is, as described above, the reflective surface can be obtained by forming a metal film on the transparent member by vapor deposition. At this time, a predetermined end portion of the folding mirror 8 is masked. As a result, a metal film is deposited on the central portion that is not masked to form the reflecting surface 8M, and the metal film is not formed on the masked end portion to remain transparent and become the transmitting surface 8N.

以上のように、本実施例において、接着部９Ｇは結像レンズ９の座面５ａ近傍に構成される。また、折り返しミラー８が結像レンズ９よりも長いため、折り返しミラー８の座面５ｂは、結像レンズ９の座面５ａよりも外側に形成される。そして、折り返しミラー８を上方から押圧する付勢部材11は、座面５ｂの対向する位置に形成される。このため、必然的に接着部９Ｇの上方においては光を透過する部材はないことになる。   As described above, in the present embodiment, the bonding portion 9G is configured in the vicinity of the seating surface 5a of the imaging lens 9. Further, since the folding mirror 8 is longer than the imaging lens 9, the seating surface 5 b of the folding mirror 8 is formed outside the seating surface 5 a of the imaging lens 9. The urging member 11 that presses the folding mirror 8 from above is formed at a position facing the seat surface 5b. For this reason, there is inevitably no member that transmits light above the bonding portion 9G.

このように構成することで、接着剤を硬化させる光線Ｌを結像レンズ９の上方から照射すると、光線Ｌは透過面８Ｎを透過し、接着部９Ｇの接着剤に到達する。これにより、結像レンズ９を光学箱５に対して確実に固定することができる。   With this configuration, when the light beam L for curing the adhesive is irradiated from above the imaging lens 9, the light beam L passes through the transmission surface 8N and reaches the adhesive of the bonding portion 9G. Thereby, the imaging lens 9 can be reliably fixed to the optical box 5.

また、本実施例の折り返しミラー８は、反射面８Ｍと透過面８Ｎとを有する構成であり、透過面８Ｎは、結像レンズ９の接着部９Ｇを覆う部分に形成されている。これにより、折り返しミラー８が配設された状態で結像レンズ９の位置の調整が可能であり、且つ結像レンズ９の位置の調整を終えた後で、接着固定が可能である。   In addition, the folding mirror 8 of the present embodiment has a configuration having a reflecting surface 8M and a transmitting surface 8N, and the transmitting surface 8N is formed in a portion that covers the adhesive portion 9G of the imaging lens 9. As a result, the position of the imaging lens 9 can be adjusted in a state where the folding mirror 8 is disposed, and after the adjustment of the position of the imaging lens 9 is completed, the adhesive fixing can be performed.

また、カラー画像形成装置に用いる光学走査装置の場合、複数の光学走査装置を用いるため、各光学走査装置の走査線のズレがないようにする必要がある。この場合、走査線の位置を観測しながら結像レンズ９を移動させ、走査線位置を調整する。その際に、本実施例によれば、折り返しミラー８が組み込まれた状態で、結像レンズ９を移動させ、実際に走査線の調整が終了した時点で光線Ｌを照射すれば、より正確な位置で結像レンズ９を接着固定することが可能である。このため、本実施例は有効である。   Further, in the case of an optical scanning device used in a color image forming apparatus, since a plurality of optical scanning devices are used, it is necessary to prevent the scanning lines of each optical scanning device from being shifted. In this case, the imaging lens 9 is moved while observing the position of the scanning line, and the scanning line position is adjusted. At that time, according to the present embodiment, if the imaging lens 9 is moved in a state where the folding mirror 8 is incorporated and the light beam L is irradiated when the adjustment of the scanning line is actually completed, the more accurate. It is possible to bond and fix the imaging lens 9 at the position. For this reason, this embodiment is effective.

また、従来においては、結像レンズよりも折り返しミラーが長手方向に長い場合、折り返しミラーが結像レンズを覆わないように、配設する位置を工夫していた。例えば、光学箱の表面に折り返しミラーを配設し、裏面（折り返しミラーが配設される面と反対面）に結像レンズの座面を設ける。これにより、裏面から光線Ｌを照射することで、接着剤硬化の問題を解決していた。しかし、この構成においては、結像レンズを組み込む際に、光学箱を裏返す必要がある。また、重力に逆らって結像レンズを保持する必要がある。このため、組立性が悪化するという問題があった。また、折り返しミラーと結像レンズとを光学箱の反対面に設けると、光学箱の板圧よりも接近させることができず、装置の小型化の制約になるという問題もあった。   Conventionally, when the folding mirror is longer in the longitudinal direction than the imaging lens, the position where the folding mirror is disposed is devised so as not to cover the imaging lens. For example, a folding mirror is provided on the surface of the optical box, and a seating surface of the imaging lens is provided on the back surface (the surface opposite to the surface on which the folding mirror is provided). Thereby, the problem of adhesive hardening was solved by irradiating the light beam L from the back surface. However, in this configuration, the optical box needs to be turned over when the imaging lens is incorporated. In addition, it is necessary to hold the imaging lens against gravity. For this reason, there existed a problem that assembly property deteriorated. In addition, when the folding mirror and the imaging lens are provided on the opposite surface of the optical box, there is a problem that it cannot be brought closer to the plate pressure of the optical box, which limits the size reduction of the apparatus.

本実施例の構成によれば、折り返しミラー８と結像レンズ９とを光学箱５の同一の面から組み付けることができ、組立性に優れる。また、同一の面に折り返しミラー８と結像レンズ９とを配設することで、折り返しミラー８と結像レンズ９とを可能な限り接近させることができ、装置の小型化をも図ることができる。   According to the configuration of the present embodiment, the folding mirror 8 and the imaging lens 9 can be assembled from the same surface of the optical box 5, and the assemblability is excellent. Further, by providing the folding mirror 8 and the imaging lens 9 on the same surface, the folding mirror 8 and the imaging lens 9 can be brought as close as possible, and the apparatus can be miniaturized. it can.

光学走査装置の構成を説明するための斜視図。The perspective view for demonstrating the structure of an optical scanning device. 折り返しミラー及び結像レンズの位置関係を説明する側断面図。FIG. 4 is a side sectional view for explaining the positional relationship between a folding mirror and an imaging lens. 折り返しミラー及び結像レンズの位置関係を説明する拡大斜視図。FIG. 3 is an enlarged perspective view illustrating a positional relationship between a folding mirror and an imaging lens. 画像形成装置の構成を説明するための概略断面図。1 is a schematic cross-sectional view for explaining a configuration of an image forming apparatus.

符号の説明Explanation of symbols

Ｌ…光線、Ｐ…転写材、１…光学走査装置、２…レーザ光源ユニット、３…光束、４…回転多面鏡、４ａ…反射面、５…光学箱、５ａ…座面、５ｂ…座面、６…光偏向器、７…走査レンズ、８…折り返しミラー（反射鏡）、８Ｍ…反射面、８Ｎ…透過面、９…結像レンズ、９Ｇ…接着部、10…感光体ドラム（被走査面、像担持体）、11…付勢部材、50…画像形成装置、51…現像装置、52…転写ベルト、53…給送カセット、54…転写部、55…定着部、56…排出部
L ... Light beam, P ... Transfer material, 1 ... Optical scanning device, 2 ... Laser light source unit, 3 ... Light flux, 4 ... Rotating polygon mirror, 4a ... Reflecting surface, 5 ... Optical box, 5a ... Seat surface, 5b ... Seat surface , 6 ... Optical deflector, 7 ... Scanning lens, 8 ... Folding mirror (reflecting mirror), 8M ... Reflecting surface, 8N ... Transmission surface, 9 ... Imaging lens, 9G ... Adhesive part, 10 ... Photosensitive drum (scanned) 11 ... biasing member, 50 ... image forming device, 51 ... developing device, 52 ... transfer belt, 53 ... feed cassette, 54 ... transfer portion, 55 ... fixing portion, 56 ... discharge portion

Claims (2)

回転多面鏡によって偏向走査される光束を反射する反射鏡と、前記光束を被走査面に結像させる結像レンズと、を有する光学走査装置において、
前記反射鏡は、前記結像レンズを覆うように該結像レンズと近接して配設され、
前記反射鏡における前記結像レンズが装置筐体に接着される接着部を覆う部分は、光を透過するように構成されることを特徴とする光学走査装置。 In an optical scanning device having a reflecting mirror that reflects a light beam deflected and scanned by a rotating polygon mirror, and an imaging lens that forms an image of the light beam on a surface to be scanned.
The reflecting mirror is disposed in proximity to the imaging lens so as to cover the imaging lens;
The optical scanning device according to claim 1, wherein a portion of the reflecting mirror that covers an adhesion portion where the imaging lens is adhered to an apparatus housing is configured to transmit light. 前記反射鏡は、反射面と透過面とを有し、
前記透過面は、前記結像レンズの接着部を覆う部分に形成されていることを特徴とする請求項１に記載の光学走査装置。 The reflecting mirror has a reflecting surface and a transmitting surface,
The optical scanning device according to claim 1, wherein the transmission surface is formed in a portion that covers an adhesive portion of the imaging lens.
JP2006009374A 2006-01-18 2006-01-18 Optical scanning device Expired - Fee Related JP4965860B2 (en)

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US8174748B2 (en) 2007-11-26 2012-05-08 Ricoh Company, Ltd. Mirror and optical scanning device
JP2017120442A (en) * 2017-03-08 2017-07-06 キヤノン株式会社 Scanning optical device and image forming apparatus including the same
US9977237B2 (en) 2013-01-30 2018-05-22 Canon Kabushiki Kaisha Optical scanning device, and image forming apparatus equipped with the same

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JP2005055471A (en) * 2003-08-04 2005-03-03 Canon Inc Optical scanner
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US8174748B2 (en) 2007-11-26 2012-05-08 Ricoh Company, Ltd. Mirror and optical scanning device
US9977237B2 (en) 2013-01-30 2018-05-22 Canon Kabushiki Kaisha Optical scanning device, and image forming apparatus equipped with the same
JP2017120442A (en) * 2017-03-08 2017-07-06 キヤノン株式会社 Scanning optical device and image forming apparatus including the same

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