JP2012209623A - Image reader and image formation device including the same - Google Patents

Image reader and image formation device including the same Download PDF

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JP2012209623A
JP2012209623A JP2011071537A JP2011071537A JP2012209623A JP 2012209623 A JP2012209623 A JP 2012209623A JP 2011071537 A JP2011071537 A JP 2011071537A JP 2011071537 A JP2011071537 A JP 2011071537A JP 2012209623 A JP2012209623 A JP 2012209623A
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image
optical frame
dust
proof film
roller
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Katsuhiko Okamoto
克彦 岡本
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Kyocera Document Solutions Inc
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Kyocera Document Solutions Inc
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Abstract

PROBLEM TO BE SOLVED: To provide an image reader capable of preventing intrusion of a foreign matter into an optical frame by a simple configuration without inviting cost increase.SOLUTION: In an image reader 50 formed by housing, inside an optical frame 51, illumination means for illuminating an original with light, an image forming lens for image-forming reflected light from the original and an imaging device for converting a latent image image-formed by the image forming lens to electric signals, dust-proof films 66 and 67 for closing a notch 63 and holes 64 and 65 formed on the optical frame 51 are stuck to the optical frame 51. Also, the dust-proof film 66 is stuck with a magic tape to a part of the optical frame 51 where the dust-proof film 67 is to be detached, and the dust-proof film 67 is stuck with a double-sided tape to a part of the optical frame 51 where the dust-proof film 67 is not to be detached.

Description

本発明は、原稿画像を光学的に読み取るための画像読取装置とこれを備えた画像形成装置に関するものである。   The present invention relates to an image reading apparatus for optically reading a document image and an image forming apparatus including the image reading apparatus.

電子写真方式によって用紙等の記録材に画像を形成する複写機やプリンター等の画像形成装置には原稿画像を光学的に読み取るための画像読取装置が備えられている。この画像読取装置は、原稿を光照明する照明手段と、原稿からの反射光を結像させる結像レンズと、前記結像レンズによって結像された潜像を電気信号に変換する撮像素子を光学フレーム内に収容して構成されている。   An image reading apparatus for optically reading a document image is provided in an image forming apparatus such as a copying machine or a printer that forms an image on a recording material such as paper by an electrophotographic method. The image reading apparatus optically includes an illuminating unit that illuminates a document, an imaging lens that forms an image of reflected light from the document, and an imaging element that converts a latent image formed by the imaging lens into an electrical signal. It is housed in a frame.

ところで、画像読取装置の光学フレームには読取光学系の組み立てや調整のための切欠きや孔が形成されており、その外側に外装カバーが設けられている。   Incidentally, the optical frame of the image reading apparatus is provided with notches and holes for assembling and adjusting the reading optical system, and an exterior cover is provided on the outside thereof.

しかし、上記構成では、外装カバーと光学フレームの間の隙間と光学フレームに形成された切欠きや孔から光学フレーム内に異物が侵入し、この異物が光路を塞ぐことによって筋状の画像が発生する可能性がある。一般的に通常の環境下での異物の大きさは０．３ｍｍ程度であると言われている。このため、外装カバーと光学フレームの間の隙間が０．３ｍｍ以上であると、その隙間から異物が侵入し、この異物が光学フレームの切欠きや孔から光学フレーム内に侵入するために筋状の画像が発生する可能性がある。   However, in the above configuration, foreign matter enters the optical frame through the gap between the exterior cover and the optical frame and the cutouts or holes formed in the optical frame, and the foreign matter closes the optical path to generate a streak image. there's a possibility that. In general, it is said that the size of foreign matter in a normal environment is about 0.3 mm. For this reason, if the gap between the exterior cover and the optical frame is 0.3 mm or more, foreign matter enters from the gap, and the foreign matter enters the optical frame from the cutouts or holes of the optical frame. May occur.

そこで、特許文献１には、ミラー取付部の隙間をポリエステルシートによって密閉する構成が提案されている。   Therefore, Patent Document 1 proposes a configuration in which the gap between the mirror mounting portions is sealed with a polyester sheet.

又、特許文献２には、シートガイドにスリットを有する原稿搬送装置と読取ユニットの間にシャッターを設け、このシャッターを読取ユニットの移動に連動して開閉させる構成が提案されている。   Patent Document 2 proposes a configuration in which a shutter is provided between a document conveying apparatus having a slit in a sheet guide and a reading unit, and the shutter is opened and closed in conjunction with the movement of the reading unit.

特開平５−１３６９３９号公報JP-A-5-136939 特開２００６−１４０５７７号公報JP 2006-140577 A

しかしながら、特許文献１において提案された構成では、光学フレーム内への異物の侵入を防ぐ防塵対策が施されていないため、光学フレーム内に異物が侵入するという問題がある。又、異物は粉塵であるため、ポリエステルシートをミラー取付部のリブに貼り付けても、異物がミラーに付着する可能性がある。   However, the configuration proposed in Patent Document 1 has a problem that foreign matter enters into the optical frame because no dust-proofing measures are taken to prevent the entry of foreign matter into the optical frame. In addition, since the foreign matter is dust, the foreign matter may adhere to the mirror even if the polyester sheet is attached to the rib of the mirror mounting portion.

又、特許文献２において提案された構成では、シャッターを開閉させる機構が必要であるためにコストアップを免れず、原稿載置用コンタクトガラスの付近には異物侵入防止構造が設けられていないため、隙間から光学フレーム内に異物が侵入する可能性がある。   Further, in the configuration proposed in Patent Document 2, since a mechanism for opening and closing the shutter is necessary, the cost is unavoidable, and no foreign matter intrusion prevention structure is provided in the vicinity of the document placement contact glass. Foreign matter may enter the optical frame from the gap.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、コストアップを招くことなく、簡単な構成で光学フレーム内への異物の侵入を防ぐことができる画像読取装置及びこれを備えた画像形成装置を提供することにある。   The present invention has been made in view of the above problems, and an object of the processing is an image reading apparatus capable of preventing entry of foreign matter into an optical frame with a simple configuration without incurring an increase in cost. An image forming apparatus is provided.

上記目的を達成するため、請求項１記載の発明は、原稿を光照明する照明手段と、原稿からの反射光を結像させる結像レンズと、前記結像レンズによって結像された潜像を電気信号に変換する撮像素子を光学フレーム内に収容して成る画像読取装置において、前記光学フレームに形成された切欠きや孔を塞ぐ防塵フィルムを前記光学フレームに貼付したことを特徴とする。   In order to achieve the above object, the invention described in claim 1 is directed to illuminating means for illuminating an original, an imaging lens for imaging reflected light from the original, and a latent image formed by the imaging lens. In an image reading apparatus in which an image pickup device for converting an electric signal is accommodated in an optical frame, a dustproof film for closing a notch or a hole formed in the optical frame is attached to the optical frame.

請求項２記載の発明は、請求項１記載の発明において、前記防塵フィルムを取り外しする前記光学フレームの箇所には前記防塵フィルムを取り外し可能なテープによって貼付し、防塵フィルムを取り外ししない前記光学フレームの箇所には前記防塵フィルムを両面テープによって貼付したことを特徴とする。   The invention according to claim 2 is the invention according to claim 1, wherein the dust-proof film is attached to a portion of the optical frame from which the dust-proof film is removed with a removable tape, and the dust-proof film is not removed. The location is characterized in that the dust-proof film is pasted with a double-sided tape.

請求項３記載の発明は、請求項１記載の発明において、前記防塵フィルムを取り外しする前記光学フレームの箇所には前記防塵フィルムをマジックテープ（登録商標）によって貼付し、防塵フィルムを取り外ししない前記光学フレームの箇所には前記防塵フィルムを両面テープによって貼付したことを特徴とする。   According to a third aspect of the present invention, in the first aspect of the present invention, the optical film in which the dustproof film is pasted to the portion of the optical frame from which the dustproof film is removed with Velcro (registered trademark) and the dustproof film is not removed. The dust-proof film is attached to a frame portion with a double-sided tape.

請求項４記載の画像形成装置は、請求項１〜３の何れかに記載の画像読取装置を備えることを特徴とする。   An image forming apparatus according to a fourth aspect includes the image reading apparatus according to any one of the first to third aspects.

請求項１記載の発明によれば、光学フレームに形成された切欠きや孔が光学フレームに貼付された防塵フィルムによって塞がれるため、これらの切欠きや孔から光学フレーム内への異物の侵入が確実に防がれる。そして、このような効果は単に防塵フィルムを光学フレームに貼付するだけの簡単な構成によって得られるため、コストアップを招くことがない。   According to the first aspect of the present invention, since the notches and holes formed in the optical frame are closed by the dust-proof film attached to the optical frame, the entry of foreign matter into the optical frame from these notches and holes. Is reliably prevented. And since such an effect is acquired by the simple structure which only attaches a dust-proof film to an optical frame, it does not cause a cost increase.

請求項２記載の発明によれば、防塵フィルムを取り外しする光学フレームの箇所には前記防塵フィルムを取り外し可能なマジックテープ（登録商標）等によって貼付するため、製造ラインや市場で読取光学部品を交換した後に組み立てや調整のために光学フレームに形成された切欠きや孔を再び使用するときには、マジックテープ（登録商標）等で貼付された防塵フィルムを光学フレームから簡単に剥がすことができ、組み立てや調整が済んだ後にはマジックテープ（登録商標）等によって防塵フィルムを光学フレームに再び簡単に貼付して切欠きや孔を塞ぐことができる。又、読取光学部品の組み立てや調整の際に再び使用されない切欠きや孔が形成された光学フレームの箇所は防塵フィルムを剥がす必要がないため、この防塵フィルムを両面テープによって光学フレームに簡単に貼り付けることができる。   According to the second aspect of the present invention, since the dust-proof film is affixed to the portion of the optical frame from which the dust-proof film is removed with removable Velcro (registered trademark) or the like, the reading optical component is replaced on the production line or the market After that, when using the notches and holes formed in the optical frame again for assembly and adjustment, the dust-proof film attached with Velcro (registered trademark) etc. can be easily peeled off from the optical frame. After the adjustment is completed, the dust-proof film can be simply attached again to the optical frame with Velcro (registered trademark) or the like to close the notch or the hole. In addition, it is not necessary to peel off the dust-proof film at the location of the optical frame where notches and holes are formed that will not be used again when assembling or adjusting the reading optical components. Can be attached.

請求項３記載の発明によれば、画像読取装置の光学フレーム内への異物に侵入が防がれるため、異物が光路を塞ぐことによる筋状の画像の発生が防がれ、高質画像を安定的に得ることができる。   According to the third aspect of the present invention, since foreign matter can be prevented from entering the optical frame of the image reading apparatus, generation of a streak image due to the foreign matter blocking the optical path is prevented, and a high quality image can be obtained. It can be obtained stably.

本発明に係る画像形成装置（複合機）の縦断面図である。1 is a longitudinal sectional view of an image forming apparatus (multifunction machine) according to the present invention. 本発明に係る画像読取装置の副走査方向断面図である。3 is a cross-sectional view in the sub-scanning direction of the image reading apparatus according to the present invention. FIG. 本発明に係る画像読取装置の光学フレームに斜視図である。1 is a perspective view of an optical frame of an image reading apparatus according to the present invention. 図３のＡ部拡大詳細図である。It is the A section enlarged detail drawing of FIG. 図３のＡ部の防塵フィルム貼付前の状態を示す斜視図である。It is a perspective view which shows the state before the dust-proof film sticking of the A section of FIG.

以下に本発明の実施の形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

［画像形成装置］
図１は本発明に係る画像形成装置の縦断面図であり、図示の画像形成装置は、複写機能とプリンター機能及びファクシミリ機能を兼備したカラー複合機であって、用紙の両面にカラー画像を形成することができる装置である。このカラー複合機は、装置本体１００とその上部に配された自動原稿搬送装置４０及び原稿読取装置５０を備えており、装置本体１００の内部上方には画像形成部１が配置されている。又、装置本体１００内の下半部には用紙収納部７０が配され、装置本体１００内の画像形成部１と用紙収納部７０の間には転写搬送ユニット８０と両面搬送ユニット９０が配されている。 [Image forming apparatus]
FIG. 1 is a longitudinal sectional view of an image forming apparatus according to the present invention. The illustrated image forming apparatus is a color multi-function machine having both a copying function, a printer function, and a facsimile function, and forms color images on both sides of a sheet. It is a device that can do. This color multifunction peripheral includes an apparatus main body 100 and an automatic document feeder 40 and an original reading apparatus 50 arranged on the upper part of the apparatus main body 100, and the image forming unit 1 is disposed above the apparatus main body 100. A sheet storage unit 70 is disposed in the lower half of the apparatus main body 100, and a transfer conveyance unit 80 and a duplex conveyance unit 90 are disposed between the image forming unit 1 and the sheet storage unit 70 in the apparatus main body 100. ing.

前記画像形成部１は、電子写真方式によって画像を形成するものであって、タンデムに配置されたマゼンタ画像形成ユニット１Ｍ、シアン画像形成ユニット１Ｃ、イエロー画像形成ユニット１Ｙ及びブラック画像形成ユニット１Ｋを備えている。   The image forming unit 1 forms an image by electrophotography, and includes a magenta image forming unit 1M, a cyan image forming unit 1C, a yellow image forming unit 1Y, and a black image forming unit 1K arranged in tandem. ing.

上記各画像形成ユニット１Ｍ，１Ｃ，１Ｙ，１Ｋには、像担持体である感光ドラム２ａ，２ｂ，２ｃ，２ｄがそれぞれ配置されており、各感光ドラム２ａ〜２ｄの周囲には、露光装置３ａ，３ｂ，３ｃ，３ｄ、帯電器４ａ，４ｂ，４ｃ，４ｄ、現像装置５ａ，５ｂ，５ｃ，５ｄ、一次転写ローラー６ａ，６ｂ，６ｃ，５ｄ及びクリーニング装置７ａ，７ｂ，７ｃ，７ｄがそれぞれ配置されている。   Each of the image forming units 1M, 1C, 1Y, and 1K is provided with photosensitive drums 2a, 2b, 2c, and 2d, which are image carriers, and an exposure device 3a is provided around each of the photosensitive drums 2a to 2d. , 3b, 3c, 3d, chargers 4a, 4b, 4c, 4d, developing devices 5a, 5b, 5c, 5d, primary transfer rollers 6a, 6b, 6c, 5d and cleaning devices 7a, 7b, 7c, 7d, respectively. Has been.

ここで、前記感光ドラム２ａ〜２ｄは、ドラム状の感光体であって、不図示の駆動モーターによって図示矢印方向（反時計方向）に所定のプロセススピードで回転駆動される。又、前記露光装置３ａ〜３ｄは各色の画像信号に対応するレーザー光を各感光ドラム２ａ〜２ｄに向けて照射することによって各感光ドラム２ａ〜２ｄ上に静電潜像を形成するものであり、前記帯電器４ａ〜４ｄは、不図示の帯電バイアス電源から印加される帯電バイアスによって感光ドラム２ａ〜２ｄの表面を所定の電位に均一に帯電させるものである。   Here, the photosensitive drums 2a to 2d are drum-shaped photosensitive members, and are rotationally driven at a predetermined process speed in a direction indicated by an arrow (counterclockwise) by a driving motor (not shown). The exposure devices 3a to 3d form electrostatic latent images on the photosensitive drums 2a to 2d by irradiating the photosensitive drums 2a to 2d with laser beams corresponding to the image signals of the respective colors. The chargers 4a to 4d uniformly charge the surfaces of the photosensitive drums 2a to 2d to a predetermined potential by a charging bias applied from a charging bias power source (not shown).

更に、前記現像装置５ａ〜５ｄは、マゼンタ（Ｍ）トナー、シアン（Ｃ）トナー、イエロー（Ｙ）トナー、ブラック（Ｋ）トナーをそれぞれ収容しており、各感光ドラム２ａ〜２ｄ上に形成された各静電潜像に各色のトナーを付着させて各静電潜像を各色のトナー像として可視像化するものである。   Further, the developing devices 5a to 5d contain magenta (M) toner, cyan (C) toner, yellow (Y) toner, and black (K) toner, respectively, and are formed on the photosensitive drums 2a to 2d. In addition, the toner of each color is attached to each electrostatic latent image to visualize each electrostatic latent image as a toner image of each color.

又、前記一次転写ローラー６ａ〜６ｄは、各一次転写部にて無端状の中間転写ベルト８を介して各感光ドラム２ａ〜２ｄに当接可能に配置されている。ここで、中間転写ベルト８は、二次転写対向ローラー９と駆動ローラー１０及び複数のテンションローラー１１，１２，１３との間に張設されて各感光ドラム２ａ〜２ｄの下面側に図示矢印方向（時計方向）に走行可能に配置されており、前記二次転写対向ローラー９は、二次転写部において中間転写ベルト８を介して二次転写ローラー１４に当接可能に配置されている。   The primary transfer rollers 6a to 6d are arranged so as to be in contact with the photosensitive drums 2a to 2d via an endless intermediate transfer belt 8 at each primary transfer portion. Here, the intermediate transfer belt 8 is stretched between the secondary transfer counter roller 9, the driving roller 10, and the plurality of tension rollers 11, 12, and 13, and in the direction indicated by the arrow on the lower surface side of each of the photosensitive drums 2 a to 2 d. The secondary transfer counter roller 9 is disposed so as to be able to contact the secondary transfer roller 14 via the intermediate transfer belt 8 in the secondary transfer portion.

前記用紙収納部７０は、複数枚の用紙が積層収容された着脱可能な３つの給紙カセット７１，７２，７３を備えており、各給紙カセット７１〜７３の近傍には、各給紙カセット７１〜７３内の用紙を上位のものから順次取り出すピックローラー１５と、取り出された用紙を１枚ずつ分離して送り出すフィードローラー１６とリタードローラー１７がそれぞれ配設されている。又、バイパストレイ７４の近傍には、バイパス搬送手段としてのピックローラー１５、フィードローラー１６、リタードローラー１７及び搬送ローラー１８が設けられている。尚、図１において１９は搬送ローラーである。   The paper storage unit 70 includes three detachable paper feed cassettes 71, 72, and 73 in which a plurality of paper sheets are stacked and accommodated, and each paper feed cassette 71 to 73 is in the vicinity of each paper feed cassette. A pick roller 15 for sequentially taking out the sheets in 71 to 73 from the upper one, a feed roller 16 for separating and feeding out the taken sheets one by one, and a retard roller 17 are provided. In the vicinity of the bypass tray 74, a pick roller 15, a feed roller 16, a retard roller 17, and a transport roller 18 are provided as bypass transport means. In FIG. 1, reference numeral 19 denotes a transport roller.

前記転写搬送ユニット８０は、用紙収納部７０から送り出された用紙を適当なタイミングで画像形成部１へと搬送するとともに、画像形成部１において画像が形成された用紙を不図示の排紙トレイへと排出するものであって、用紙収納部７０から二次転写部（二次転写対向ローラー９と二次転写ローラー１４の当接部）に至る第１搬送経路Ｌ１に配置されたレジストローラー２０、前記二次転写ローラー１４、二次転写部から排紙手段としての後述の排紙ローラー２４に至る第２搬送経路Ｌ２に設けられた搬送ベルト２１、定着装置２２と搬送ローラー２３及び排紙ローラー２４ーを備えている。ここて、定着装置２２は、圧接状態で互いに回転する定着ローラー２２ａと加圧ローラー２２ｂを備えている。   The transfer conveyance unit 80 conveys the sheet fed from the sheet storage unit 70 to the image forming unit 1 at an appropriate timing, and the sheet on which the image is formed in the image forming unit 1 to a paper discharge tray (not shown). A registration roller 20 disposed in a first conveyance path L1 from the paper storage unit 70 to the secondary transfer unit (the contact portion between the secondary transfer counter roller 9 and the secondary transfer roller 14), A conveyance belt 21, a fixing device 22, a conveyance roller 23, and a sheet discharge roller 24 provided in a second conveyance path L2 from the secondary transfer roller 14 and the secondary transfer unit to a sheet discharge roller 24 described later as a sheet discharge unit. Is equipped. The fixing device 22 includes a fixing roller 22a and a pressure roller 22b that rotate in a pressure contact state.

又、転写搬送ユニット８０は、画像形成装置本体１００に対して着脱可能であって、前記転写搬送ユニット８０には、第２搬送経路Ｌ２から分岐して両面搬送ユニット９０の反転ローラー２５と反転コロ２６に至る横Ｕ字状の第３搬送経路Ｌ３が設けられており、その途中には搬送ローラー２７が設けられている。又、転写搬送ユニット８０には前記第３搬送経路Ｌ３とは別に反転搬送経路Ｌ３’が第２搬送経路Ｌ２から分岐して下方に延びており、その途中には搬送ローラー２８が設けられている。そして、第２搬送経路Ｌ２と第３搬送経路Ｌ３との分岐部には、用紙の搬送方向を切り換えるためのフラッパ２９が回動可能に設けられている。   The transfer conveyance unit 80 can be attached to and detached from the image forming apparatus main body 100. The transfer conveyance unit 80 branches from the second conveyance path L2 and the reverse roller 25 and the reverse roller of the duplex conveyance unit 90. A horizontal U-shaped third conveyance path L3 reaching 26 is provided, and a conveyance roller 27 is provided in the middle. In addition to the third transport path L3, a reverse transport path L3 ′ branches from the second transport path L2 and extends downward in the transfer transport unit 80, and a transport roller 28 is provided in the middle thereof. . A flapper 29 for switching the paper transport direction is rotatably provided at a branch portion between the second transport path L2 and the third transport path L3.

前記両面搬送ユニット９０は、画像形成部１において画像が形成された用紙の表裏を反転させるものであって、前記第３搬送経路Ｌ３と反転搬送経路Ｌ３に連なる中間トレイ３０とその下方に配された第４搬送経路Ｌ４を備えており、中間トレイ３０には、正逆転可能な前記反転ローラー２５と、前記反転ローラー２５に対して圧接／離間する前記反転コロ２６が設けられている。   The double-sided conveyance unit 90 reverses the front and back of the sheet on which the image is formed in the image forming unit 1, and is arranged below the intermediate tray 30 that is continuous with the third conveyance path L3 and the reverse conveyance path L3. The intermediate tray 30 is provided with the reversing roller 25 that can be rotated forward and backward, and the reversing roller 26 that is pressed against / separated from the reversing roller 25.

又、両面搬送ユニット９０には大径の再給紙ローラー３２が回転可能に設けられており、この再給紙ローラー３２の外周には小径のローラー３３，３４が回転可能に当接している。尚、再給紙ローラー３２には不図示の一方向クラッチが設けられている。そして、反転手段を構成する前記反転ローラー２５と反転コロ２６からは第１搬送経路Ｌ４が延びており、この第４搬送経路Ｌ４は前記第１搬送経路Ｌ１に合流している。   The double-sided conveyance unit 90 is provided with a large-diameter refeed roller 32 so as to be rotatable. Small-diameter rollers 33 and 34 are rotatably in contact with the outer periphery of the refeed roller 32. The refeed roller 32 is provided with a one-way clutch (not shown). And the 1st conveyance path | route L4 is extended from the said inversion roller 25 and the inversion roller 26 which comprise inversion means, and this 4th conveyance path | route L4 has joined the said 1st conveyance path | route L1.

上記第４搬送経路Ｌ４には、搬送ローラー３５が用紙搬送方向に沿って複数設けられている。又、再給紙ローラー３２の近傍には、中間トレイ３０に一旦引き込まれた用紙の搬送方向を切り換えるためのフラッパ３６が回動可能に設けられている。尚、本実施の形態では、両面搬送ユニット９０の第４搬送経路Ｌ４には、２枚以上の用紙を保留可能な２つ以上の用紙保留位置が備えられている。   A plurality of transport rollers 35 are provided along the paper transport direction in the fourth transport path L4. Further, in the vicinity of the refeed roller 32, a flapper 36 for switching the transport direction of the paper once drawn into the intermediate tray 30 is rotatably provided. In the present embodiment, the fourth transport path L4 of the duplex transport unit 90 is provided with two or more paper storage positions where two or more sheets can be stored.

次に、以上の構成を有するカラー複合機の画像形成動作について説明する。   Next, an image forming operation of the color multifunction peripheral having the above configuration will be described.

例えば、自動原稿搬送装置４０の原稿トレイ４１にセットされた図２に示す原稿が原稿読取部であるコンタクトガラス５０ａ（図２参照）上に自動的に搬送され、その原稿Ｇの画像が原稿読取装置５０によって光学的に読み取られる。   For example, the document shown in FIG. 2 set on the document tray 41 of the automatic document feeder 40 is automatically conveyed onto a contact glass 50a (see FIG. 2) as a document reading unit, and an image of the document G is read as a document. Optically read by the device 50.

上述のように原稿の画像が画像読取装置５０によって光学的に読み取られると、画像形成部１においては、各画像形成ユニット１Ｍ，１Ｃ，１Ｙ，１Ｋにおいて各感光ドラム２ａ〜２ｄが図示矢印方向（反時計方向）に所定のプロセススピードで回転駆動され、これらの感光ドラム２ａ〜２ｄは、帯電器４ａ〜４ｄによって一様に帯電される。又、露光装置３ａ〜３ｄは、原稿読取装置６０によって読み取られた画像の各色毎の信号によって変調されたレーザー光を出射し、そのレーザー光を各感光ドラム２ａ〜２ｄの表面に照射し、各感光ドラム２ａ〜２ｄ上に各色のカラー画像信号に対応した静電潜像をそれぞれ形成する。   As described above, when the image of the original is optically read by the image reading device 50, in the image forming unit 1, the photosensitive drums 2a to 2d in the image forming units 1M, 1C, 1Y, and 1K are in the directions indicated by the arrows ( The photosensitive drums 2a to 2d are uniformly charged by the chargers 4a to 4d. The exposure devices 3a to 3d emit laser beams modulated by signals for the respective colors of the image read by the document reading device 60, and irradiate the surfaces of the photosensitive drums 2a to 2d with the laser beams. An electrostatic latent image corresponding to each color image signal is formed on each of the photosensitive drums 2a to 2d.

そして、先ず、マゼンタ画像形成ユニット１Ｍの感光ドラム２ａ上に形成された静電潜像に、前記感光ドラム２ａの帯電極性と同極性の現像バイアスが印加された現像装置５ａによってマゼンタトナーを付着させ、前記静電潜像をマゼンタトナー像として可視像化する。このマゼンタトナー像は、感光ドラム２ａと一次転写ローラー６ａとの間の一次転写部（転写ニップ部）において、トナーと逆極性の一次転写バイアスが印加された一次転写ローラー６ａの作用によって、図示矢印方向に回転駆動されている中間転写ベルト８上に一次転写される。   First, magenta toner is attached to the electrostatic latent image formed on the photosensitive drum 2a of the magenta image forming unit 1M by the developing device 5a to which a developing bias having the same polarity as the charged polarity of the photosensitive drum 2a is applied. The electrostatic latent image is visualized as a magenta toner image. This magenta toner image is shown in the figure by the action of the primary transfer roller 6a to which a primary transfer bias having a polarity opposite to that of the toner is applied in a primary transfer portion (transfer nip portion) between the photosensitive drum 2a and the primary transfer roller 6a. Primary transfer is performed on the intermediate transfer belt 8 that is rotationally driven in the direction.

上述のようにしてマゼンタトナー像が一次転写された中間転写ベルト８は、次のシアン画像形成ユニット１Ｃへと移動する。そして、シアン画像形成ユニット１Ｃにおいても、前記と同様にして、感光ドラム２ｂ上に形成されたシアントナー像が一次転写部において中間転写ベルト８上のマゼンタトナー像に重ねて転写される。   The intermediate transfer belt 8 on which the magenta toner image has been primarily transferred as described above moves to the next cyan image forming unit 1C. Also in the cyan image forming unit 1C, similarly to the above, the cyan toner image formed on the photosensitive drum 2b is transferred to the magenta toner image on the intermediate transfer belt 8 at the primary transfer portion.

以下同様にして、中間転写ベルト８上に重畳転写されたマゼンタ及びシアントナー像の上に、イエロー及びブラック画像形成ユニット１Ｙ，１Ｋの各感光ドラム２ｃ，２ｄ上にそれぞれ形成されたイエロー及びブラックトナー像が各一次転写部において順次重ね合わせられ、中間転写ベルト８上にはフルカラーのトナー像が形成される。尚、中間転写ベルト８上に転写されないで各感光ドラム２ａ〜２ｄ上に残留する転写残トナーは、各クリーニング装置７ａ〜７ｄによって除去され、各感光ドラム２ａ〜２ｄは次の画像形成に備えられる。   Similarly, yellow and black toners respectively formed on the photosensitive drums 2c and 2d of the yellow and black image forming units 1Y and 1K on the magenta and cyan toner images superimposed and transferred on the intermediate transfer belt 8, respectively. The images are sequentially superimposed on each primary transfer portion, and a full-color toner image is formed on the intermediate transfer belt 8. The transfer residual toner that is not transferred onto the intermediate transfer belt 8 and remains on the photosensitive drums 2a to 2d is removed by the cleaning devices 7a to 7d, and the photosensitive drums 2a to 2d are prepared for the next image formation. .

他方、用紙収納部７０の例えば給紙カセット７２内に収容された用紙は、ピックローラー１５によって最上位のものから１枚ずつピックアップされ、フィードローラー１６とリタードローラー１７によって１枚ずつ分離されて搬送ローラー１９によって第１搬送経路路Ｌ１をレジストローラー２０へと搬送される。そして、レジストローラー２０においては、用紙は、一時待機状態とされた後、中間転写ベルト８上のトナー像に同期する所定のタイミングで二次転写対向ローラー９と二次転写ローラー１４との当接部である二次転写部へと供給される。   On the other hand, the sheets stored in, for example, the sheet feeding cassette 72 in the sheet storage unit 70 are picked up one by one from the uppermost one by the pick roller 15, separated one by one by the feed roller 16 and the retard roller 17, and conveyed. The roller 19 conveys the first conveyance path L1 to the registration roller 20. In the registration roller 20, after the paper is temporarily in a standby state, the secondary transfer counter roller 9 and the secondary transfer roller 14 come into contact with each other at a predetermined timing synchronized with the toner image on the intermediate transfer belt 8. Is supplied to a secondary transfer portion which is a portion.

二次転写部においては、転写ベルト８上に担持されたフルカラーのトナー像が二次転写ローラー１４の作用によって用紙の表面（第１面）上に一括転写される。そして、トナー像が転写された用紙は、搬送ベルト２１によって定着装置２２へと搬送され、この定着装置２２の定着ローラー２２ａと加圧ローラー２２ｂ間の定着ニップを通過する過程で加熱及び加圧されてトナー像の定着を受ける。   In the secondary transfer portion, the full-color toner image carried on the transfer belt 8 is collectively transferred onto the surface (first surface) of the paper by the action of the secondary transfer roller 14. The sheet on which the toner image is transferred is conveyed to the fixing device 22 by the conveying belt 21, and is heated and pressed in the process of passing through the fixing nip between the fixing roller 22a and the pressure roller 22b of the fixing device 22. The toner image is fixed.

而して、定着装置２２にて表面にトナー像が定着された用紙は、フェースアップ排紙（ＦＵ排紙）が選択されている場合には、フラッパ２９によってその搬送方向が決定され、用紙は第２搬送経路Ｌ２をそのまま排紙ローラー２４に向かって搬送され、排紙ローラー２４によって画像面を上にして不図示の排紙トレイへと排出される。   Thus, the paper whose toner image has been fixed on the surface by the fixing device 22 is determined by the flapper 29 in the conveying direction when face-up paper discharge (FU paper discharge) is selected. The paper is transported as it is toward the paper discharge roller 24 along the second transport path L2, and is discharged to a paper discharge tray (not shown) by the paper discharge roller 24 with the image surface facing up.

一方、フェースダウン排紙（ＦＤ排紙）又は両面画像モードが選択された場合には、フラッパ２９が動作して用紙の搬送方向が切り換えられ、定着装置２２を通過した用紙は横Ｕ字状の第３搬送経路Ｌ３を通って両面搬送ユニット９０へと搬送される。   On the other hand, when face-down paper discharge (FD paper discharge) or double-sided image mode is selected, the flapper 29 is operated to switch the paper transport direction, and the paper that has passed through the fixing device 22 has a horizontal U-shape. It is transported to the duplex transport unit 90 through the third transport path L3.

両面搬送ユニット９０においては、反転コロ２６は反転ローラー２５から離間した状態で待機しており、用紙が両面搬送ユニット９０に或る一定以上送られると、反転コロ２６は反転ローラー２５に圧接される。このように反転コロ２６が反転ローラー２５に圧接されると、反転ローラー２５が正転されて用紙が送られてきた方向に引き込まれ、用紙が或る一定以上引き込まれると反転ローラー２５が逆転されて用紙がスイッチバックされて反転搬送経路Ｌ３’又は第４搬送経路Ｌ４へと送られる。即ち、フェースダウン排紙が選択されている場合には、フラッパ３６によって用紙の搬送方向が反転搬送経路Ｌ３’へと切り換えられ、用紙は画像面を下にした状態で排紙ローラー２４によって不図示の排紙トレイへと排出される。   In the duplex conveying unit 90, the reversing roller 26 stands by in a state of being separated from the reversing roller 25, and the reversing roller 26 is pressed against the reversing roller 25 when the sheet is fed to the duplex conveying unit 90 more than a certain amount. . When the reversing roller 26 is pressed against the reversing roller 25 in this way, the reversing roller 25 is rotated forward and drawn in the direction in which the paper is fed, and when the paper is drawn more than a certain amount, the reversing roller 25 is reversed. Thus, the sheet is switched back and sent to the reverse conveyance path L3 ′ or the fourth conveyance path L4. That is, when face-down paper discharge is selected, the paper transport direction is switched to the reverse transport path L3 ′ by the flapper 36, and the paper is not shown by the paper discharge roller 24 with the image side down. It is discharged to the paper discharge tray.

又、用紙の両面に画像を形成する場合には、フラッパ３６によって用紙の搬送方向が第４面搬送経路Ｌ４の方向に切り換えられ、用紙は、再給紙ローラー３２と搬送ローラー３５によって第４搬送経路Ｌ４を画像面を上にして搬送され、第４搬送経路Ｌ４から第１搬送経路Ｌ１へと受け渡されることによって表裏が反転されて画像面を下にした状態でレジストローラー２０へと送られる。そして、以後は前述と同様のプロセスを経て用紙の反対面（第２面）にトナー像が形成され、このトナー像が形成された用紙は、定着装置２２によってトナー像の定着を受けた後に排紙ローラー対２４によって不図示の排紙トレイへと排出され、前記用紙の両面に画像が形成される。   When images are formed on both sides of the sheet, the conveyance direction of the sheet is switched to the direction of the fourth surface conveyance path L4 by the flapper 36, and the sheet is conveyed in the fourth direction by the refeed roller 32 and the conveyance roller 35. The image is transported along the path L4 and is transferred from the fourth transport path L4 to the first transport path L1, so that the front and back are reversed and the image is faced down and sent to the registration roller 20. . Thereafter, a toner image is formed on the opposite surface (second surface) of the paper through the same process as described above, and the paper on which the toner image is formed is discharged after the toner image is fixed by the fixing device 22. The paper is discharged to a paper discharge tray (not shown) by the paper roller pair 24 and images are formed on both sides of the paper.

尚、以上はカセット給紙を行う場合について説明したが、手差し給紙を行う場合には、バイパストレイ７４上にセットされた用紙は、ピックローラー１５によって最上位のものから１枚ずつピックアップされ、フィードローラー１６とリタードローラー１７によって１枚ずつ分離されて搬送ローラー１８によって第１搬送経路Ｌ１をレジストローラー２０へと搬送され、以後は前記と同様のプロセスを経て前記用紙に画像が形成される。
［画像読取装置］
次に、本発明に係る前記画像読取装置５０の構成を図２〜図５に基づいて説明する。 In the above description, the cassette feeding is described. However, when the manual feeding is performed, the sheets set on the bypass tray 74 are picked up one by one from the uppermost one by the pick roller 15, The sheets are separated one by one by the feed roller 16 and the retard roller 17 and conveyed by the conveyance roller 18 to the registration roller 20 through the first conveyance path L1, and thereafter, an image is formed on the sheet through the same process as described above.
[Image reading device]
Next, the configuration of the image reading apparatus 50 according to the present invention will be described with reference to FIGS.

図２は本発明に係る画像読取装置の副走査方向断面図、図３は同画像読取装置の光学フレームに斜視図、図４は図３のＡ部拡大詳細図、図５は図３のＡ部の防塵フィルム貼付前の状態を示す斜視図である。   2 is a sectional view of the image reading apparatus according to the present invention in the sub-scanning direction, FIG. 3 is a perspective view of the optical frame of the image reading apparatus, FIG. 4 is an enlarged detail view of a portion A in FIG. It is a perspective view which shows the state before a dust-proof film sticking of a part.

図２に示すように、画像読取装置５０は、筐体を構成する箱状構造体である光学フレーム５１を備えており、この光学フレーム５１の上面にはコンタクトガラス５０ａが設けられている。   As shown in FIG. 2, the image reading apparatus 50 includes an optical frame 51 that is a box-like structure constituting a housing, and a contact glass 50 a is provided on the upper surface of the optical frame 51.

又、光学フレーム５１の内部には、副走査方向に移動可能な第１及び第２移動キャリッジ５２，５３が収容されている。ここで、第１移動キャリッジ５２には、コンタクトガラス５０ａ上に載置された原稿Ｇを照明する照明部５４と、原稿Ｇにて反射した読取光（反射光）を９０°方向に反射させる第１反射ミラー５５が設けられており、第２キャリッジ５３には、第１反射ミラー５５にて反射した反射光を９０°方向に反射させる第２反射ミラー５６と、前記第２反射ミラー５６にて反射した反射光を更に９０°方向に反射させる第３反射ミラー５７が設けられており、これらの第１及び第２移動キャリッジ５２，５３は、不図示のガイドレールに沿って副走査方向（図２の左右方向）に移動する。   The optical frame 51 accommodates first and second movable carriages 52 and 53 that can move in the sub-scanning direction. Here, the first moving carriage 52 includes an illuminating unit 54 that illuminates the original G placed on the contact glass 50a, and a first light that reflects the read light (reflected light) reflected by the original G in a 90 ° direction. A first reflection mirror 55 is provided, and the second carriage 53 includes a second reflection mirror 56 that reflects the reflected light reflected by the first reflection mirror 55 in a 90 ° direction, and the second reflection mirror 56. A third reflecting mirror 57 is further provided for reflecting the reflected light in the 90 ° direction. These first and second movable carriages 52 and 53 are arranged along a guide rail (not shown) in the sub-scanning direction (see FIG. 2).

更に、光学フレーム５１の内部には結像レンズ５８と撮像素子であるＣＣＤ５９が収容されており、前記第３反射ミラー５７にて反射した原稿Ｇからの読取光は、結像レンズ５８によって収束した後にＣＣＤ５９に入射し、前記ＣＣＤ５９上に結像される。   Further, an imaging lens 58 and a CCD 59 as an image sensor are accommodated inside the optical frame 51, and the reading light from the original G reflected by the third reflecting mirror 57 is converged by the imaging lens 58. Later, the light enters the CCD 59 and forms an image on the CCD 59.

ところで、図２に示すように、前記照明部５４は、光源として主走査方向（図２の示す垂直方向）に列状（アレイ状）に配設された発光素子である複数のＬＥＤ（発光ダイオード）６０を使用するものであって、図示しないが、これらのＬＥＤ６０は主走査方向に細長いＬＥＤ基板上に実装されている。そして、ＬＥＤ基板上のＬＥＤ６０の光出射方向前方（図２の左方）には主走査方向に長い導光体６１が固定されている。この導光体６１は、アクリル樹脂等の透明樹脂又はガラスによって構成されている。又、上記導光体６１に対向する位置には、主走査方向に長いリフレクタ６２が斜めに配置されている。   As shown in FIG. 2, the illumination unit 54 includes a plurality of LEDs (light emitting diodes) as light sources arranged in a row (array) in the main scanning direction (vertical direction shown in FIG. 2). ) 60, which are not shown, these LEDs 60 are mounted on an LED substrate elongated in the main scanning direction. A light guide 61 that is long in the main scanning direction is fixed in front of the light emitting direction of the LED 60 on the LED substrate (left side in FIG. 2). The light guide 61 is made of a transparent resin such as an acrylic resin or glass. A reflector 62 that is long in the main scanning direction is disposed obliquely at a position facing the light guide 61.

次に、以上のように構成された原稿読取装置５０の画像読取動作について説明する。   Next, an image reading operation of the document reading apparatus 50 configured as described above will be described.

例えば、図１に示す自動原稿搬送装置４０の原稿トレイ４１にセットされた原稿Ｇが原稿読取部であるコンタクトガラス５０ａ上に自動的に搬送され、その原稿Ｇの画像が画像読取装置５０によって光学的に読み取られる。   For example, the original G set on the original tray 41 of the automatic original conveying apparatus 40 shown in FIG. 1 is automatically conveyed onto the contact glass 50a serving as an original reading unit, and the image of the original G is optically read by the image reading apparatus 50. Can be read.

即ち、第１移動キャリッジ５２と第２移動キャリッジ５３が不図示のガイドレールに沿って副走査方向（図２の左右方向）に移動しながらコンタクトガラス５０ａ上に載置された原稿Ｇを走査すると、第１移動キャリッジ５２のＬＥＤ６０から出射する光は導光体６１に入射する。この導光体６１内に入射した光は前記光体６１を通過するが、導光体６１から出射する光の一部は原稿Ｇに直接向かい、他の光はリフレクタ６２にて反射した後に原稿Ｇに向かい、原稿Ｇはこれらの光によって照明される。そして、これらの光は原稿Ｇにて反射し、その反射光は、第１移動キャリッジ５２の第１反射ミラー５５にて９０°方向に反射した後、第２移動キャリッジ５３の第２反射ミラー５６と第３反射ミラー５７にて９０°方向にそれぞれ反射し、結像レンズ５８によって収束した後にＣＣＤ５９に入射し、前記ＣＣＤ５９によって読み取られて電気信号に変換される。   That is, when the first moving carriage 52 and the second moving carriage 53 scan the document G placed on the contact glass 50a while moving in a sub-scanning direction (left and right direction in FIG. 2) along a guide rail (not shown). The light emitted from the LED 60 of the first moving carriage 52 enters the light guide 61. The light incident on the light guide 61 passes through the light body 61, but part of the light emitted from the light guide 61 is directed directly to the original G, and the other light is reflected by the reflector 62 and then the original. Heading G, the original G is illuminated by these lights. These lights are reflected by the original G, and the reflected light is reflected by the first reflecting mirror 55 of the first moving carriage 52 in the 90 ° direction, and then the second reflecting mirror 56 of the second moving carriage 53. Are reflected by the third reflecting mirror 57 in the 90 ° direction, converged by the imaging lens 58, and then incident on the CCD 59, read by the CCD 59, and converted into an electrical signal.

上述のようにして原稿Ｇの画像が画像読取装置５０によって光学的に読み取られると、その電気信号が各露光装置３ａ〜３ｄへと送信され、各露光装置３ａ〜３ｄは、電気信号に基づくレーザー光を出力し、図１に示すカラー複合機において前述のような画像形成動作が行われてカラー画像が形成される。   When the image of the original G is optically read by the image reading device 50 as described above, the electrical signals are transmitted to the exposure devices 3a to 3d, and the exposure devices 3a to 3d are lasers based on the electrical signals. Light is output, and the above-described image forming operation is performed in the color multifunction peripheral shown in FIG. 1 to form a color image.

ところで、図３に示すように、光学フレーム５１の上面の周囲には読取光学系の組み立てや調整のための切欠き６３や孔６４、６５が形成されており、光学フレーム５１の外側には不図示の外装カバーが設けれているが、この外装カバーと光学フレーム５１の間の隙間から侵入した異物（大きさ約０．３ｍｍ以下の粉塵等）が光学フレーム５１の切欠き６３や孔６４、６５から光学フレーム５１に入ると光路を塞いで筋状の画像が発生する可能性があることは前述の通りである。   As shown in FIG. 3, notches 63 and holes 64 and 65 for assembling and adjusting the reading optical system are formed around the upper surface of the optical frame 51, and are not formed outside the optical frame 51. Although the illustrated exterior cover is provided, foreign matter (such as dust having a size of about 0.3 mm or less) that has entered from a gap between the exterior cover and the optical frame 51 is notched 63 or a hole 64 in the optical frame 51. As described above, when entering the optical frame 51 from 65, the optical path may be blocked and a streak-like image may be generated.

そこで、本実施の形態では、光学フレーム５１に形成された切欠き６３や孔６４、６５を塞ぐ防塵フィルム６６，６７を前記光学フレーム５１に貼り付ける構成を採用している。ここで、光学フレーム５１に形成された切欠き６３や孔６４（図３のＡ部）は、製造ラインや市場で読取光学部品を交換した後に組み立てや調整のために再び使用されるものであって、これらが形成された光学フレーム５１の箇所は図５に示す状態から図４に示すように防塵フィルム６６が不図示のマジックテープ（登録商標）によって取り外し可能に貼り付けられる。   Therefore, in this embodiment, a configuration is adopted in which dust-proof films 66 and 67 that close the notches 63 and the holes 64 and 65 formed in the optical frame 51 are attached to the optical frame 51. Here, the notch 63 and the hole 64 (portion A in FIG. 3) formed in the optical frame 51 are used again for assembly and adjustment after the reading optical component is replaced on the production line or the market. Then, the dust-proof film 66 is detachably pasted from the state shown in FIG. 5 to the place of the optical frame 51 in which these are formed as shown in FIG. 4 by Velcro (registered trademark) not shown.

他方、光学フレーム５１に形成された孔６５は調整治具を嵌め込むためのものであって、再び使用されるものではないため、これらの孔６５を塞ぐ防塵フィルム６７は光学フレーム５１に不図示の両面テープによって取り外し不能に貼り付けられる。   On the other hand, the holes 65 formed in the optical frame 51 are for fitting adjustment jigs and are not used again. Therefore, a dustproof film 67 for closing these holes 65 is not shown in the optical frame 51. It is pasted in a non-removable manner with double-sided tape.

以上のように、本実施の形態では、光学フレーム５１に形成された切欠き６３や孔６４、６５が光学フレーム５１に貼付された防塵フィルム６６、６７によって塞がれるため、これらの切欠き６３や孔６４、６５から光学フレーム５１内への異物の侵入が防がれ、光学フレーム５１の内部に浸入した異物が光路を塞ぐことによる筋状画像の発生が確実に防がれる。そして、このような効果は単に防塵フィルム６６、６７を光学フレーム５１に貼り付けるだけの簡単な構成によって得られるため、コストアップを招くことがない。   As described above, in the present embodiment, the notches 63 and the holes 64 and 65 formed in the optical frame 51 are blocked by the dust-proof films 66 and 67 attached to the optical frame 51. Intrusion of foreign matter into the optical frame 51 through the holes 64 and 65 is prevented, and generation of streak images due to foreign matter entering the optical frame 51 blocking the optical path is reliably prevented. Such an effect can be obtained by a simple configuration in which the dust-proof films 66 and 67 are simply attached to the optical frame 51, so that the cost is not increased.

又、本実施の形態では、防塵フィルム６６を取り外しする光学フレーム５１の箇所には前記防塵フィルム６６をマジックテープ（登録商標）によって貼り付けるため、製造ラインや市場で読取光学部品を交換した後に組み立てや調整のために光学フレーム５１に形成された切欠き６３や孔６４を再び使用するときには、マジックテープ（登録商標）で貼り付けられた防塵フィルム６６を光学フレーム５１から簡単に剥がすことができ、組み立てや調整が済んだ後にはマジックテープ（登録商標）によって防塵フィルム６６を光学フレーム５１に再び簡単に貼り付けて切欠き６３や孔６４を塞ぐことができる。   In the present embodiment, the dust-proof film 66 is attached to the position of the optical frame 51 from which the dust-proof film 66 is removed with Velcro (registered trademark). When the notch 63 and the hole 64 formed in the optical frame 51 are used again for adjustment, the dust-proof film 66 attached with Velcro (registered trademark) can be easily peeled off from the optical frame 51. After the assembly and adjustment are completed, the dust-proof film 66 can be simply attached again to the optical frame 51 with Velcro (registered trademark) to close the notches 63 and the holes 64.

そして、読取光学部品の組み立てや調整の際に再び使用されない孔６５が形成された光学フレーム５１の箇所は防塵フィルム６７を剥がす必要がないため、この防塵フィルム６７を両面テープによって光学フレーム５１に簡単に貼り付けることができる。   Further, since it is not necessary to peel off the dust-proof film 67 at the portion of the optical frame 51 in which the hole 65 that is not used again when the reading optical component is assembled or adjusted, the dust-proof film 67 can be easily attached to the optical frame 51 with a double-sided tape. Can be pasted on.

尚、本実施の形態では、本発明をカラー複合機及びこれに備えられた画像読取装置に対して適用した例について説明したが、本発明は、単体としての複写機、プリンター、ファクシミリ等、他の任意の画像形成装置及びこれに備えられた画像読取装置に対しても同様に適用可能であることは勿論である。   In this embodiment, an example in which the present invention is applied to a color multifunction peripheral and an image reading apparatus provided in the color multifunction peripheral has been described. However, the present invention is not limited to a copying machine, a printer, a facsimile, etc. as a single unit. Of course, the present invention can be similarly applied to any image forming apparatus and an image reading apparatus provided in the image forming apparatus.

１ 画像形成部
１Ｍ マゼンタ画像形成ユニット
１Ｃ シアン画像形成ユニット
１Ｙ イエロー画像形成ユニット
１Ｋ ブラック画像形成ユニット
４０ 自動原稿搬送装置
５０ 原稿読取装置
５０ａ コンタクトガラス
５１ 光学フレーム
５２ 第１キャリッジ
５３ 第２キャリッジ
５４ 照明部(照明手段)
５５ 第１反射ミラー
５６ 第２反射ミラー
５７ 第３反射ミラー
５８ 結像レンズ
５９ ＣＣＤ（撮像素子）
６０ ＬＥＤ（光源）
６１ 導光体
６２ リフレクタ
６３ 光学フレームの切欠き
６４，６５ 光学フレームの孔
６６，６７ 防塵フィルム
７０ 用紙収納部
８０ 転写搬送ユニット
９０ 両面搬送ユニット
１００ 画像形成装置本体
DESCRIPTION OF SYMBOLS 1 Image forming part 1M Magenta image forming unit 1C Cyan image forming unit 1Y Yellow image forming unit 1K Black image forming unit 40 Automatic document feeder 50 Document reading device 50a Contact glass 51 Optical frame 52 First carriage 53 Second carriage 54 Illumination unit (Lighting means)
55 First Reflection Mirror 56 Second Reflection Mirror 57 Third Reflection Mirror 58 Imaging Lens 59 CCD (Imaging Device)
60 LED (light source)
Reference Signs List 61 Light Guide 62 Reflector 63 Notch in Optical Frame 64, 65 Hole in Optical Frame 66, 67 Dust-proof Film 70 Paper Storage Unit 80 Transfer Transport Unit 90 Duplex Transport Unit 100 Image Forming Apparatus Main Body

Claims (4)

原稿を光照明する照明手段と、原稿からの反射光を結像させる結像レンズと、前記結像レンズによって結像された潜像を電気信号に変換する撮像素子を光学フレーム内に収容して成る画像読取装置において、
前記光学フレームに形成された切欠きや孔を塞ぐ防塵フィルムを該光学フレームに貼付したことを特徴とする画像読取装置。 An optical frame includes an illuminating unit that illuminates the original, an imaging lens that forms an image of reflected light from the original, and an imaging element that converts a latent image formed by the imaging lens into an electrical signal. In the image reading apparatus comprising:
An image reading apparatus, wherein a dustproof film for closing a notch or a hole formed in the optical frame is attached to the optical frame. 前記防塵フィルムを取り外しする前記光学フレームの箇所には前記防塵フィルムを取り外し可能なテープによって貼付し、防塵フィルムを取り外ししない前記光学フレームの箇所には前記防塵フィルムを両面テープによって貼付したことを特徴とする請求項１記載の画像読取装置。   The dust-proof film is affixed to a portion of the optical frame from which the dust-proof film is removed, and the dust-proof film is affixed to a portion of the optical frame where the dust-proof film is not removed by a double-sided tape. The image reading apparatus according to claim 1. 前記防塵フィルムを取り外しする前記光学フレームの箇所には前記防塵フィルムをマジックテープによって貼付し、防塵フィルムを取り外ししない前記光学フレームの箇所には前記防塵フィルムを両面テープによって貼付したことを特徴とする請求項１記載の画像読取装置。   The dust-proof film is affixed to the portion of the optical frame from which the dust-proof film is removed with a magic tape, and the dust-proof film is attached to a portion of the optical frame where the dust-proof film is not removed with a double-sided tape. Item 2. The image reading apparatus according to Item 1. 請求項１〜３の何れかに記載の画像読取装置を備えることを特徴とする画像形成装置。
An image forming apparatus comprising the image reading apparatus according to claim 1.
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