JP2017009751A - Support structure of light emitting element for static elimination, static elimination device and image formation apparatus - Google Patents
Support structure of light emitting element for static elimination, static elimination device and image formation apparatus Download PDFInfo
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Abstract
Description
本発明は、例えば感光体の除電を行うための発光素子の支持構造、除電装置及び画像形成装置に関する。 The present invention relates to a light-emitting element support structure, a static eliminator, and an image forming apparatus, for example, for neutralizing a photoreceptor.
一方向に配列された発光ダイオードの光を導光板を介して平面状の表示面から発光させるようにした発光表示板が提案されている（特許文献１）。より詳細には、この発光表示板は、凹部（溝部）が形成されており、発光ダイオードを支持する長尺の基板を、この凹部に内装すると共に、この凹部の両側上端を導光板の端面である入光面に押し付けるように帯状バネで基板支持体を入光面方向に付勢した構造を有している。これによって、導光板が発熱によって伸縮しても、発光面と入光面との隙間を一定に維持して表示面が一定の明るさを保持できるようにしている。 There has been proposed a light emitting display panel in which light from light emitting diodes arranged in one direction is emitted from a flat display surface via a light guide plate (Patent Document 1). More specifically, the light-emitting display plate has a recess (groove) formed therein, and a long substrate that supports the light-emitting diode is provided in the recess, and the upper ends on both sides of the recess are the end faces of the light guide plate. It has a structure in which the substrate support is biased in the direction of the light incident surface by a belt-like spring so as to be pressed against a certain light incident surface. Accordingly, even when the light guide plate expands and contracts due to heat generation, the gap between the light emitting surface and the light incident surface is kept constant, so that the display surface can maintain a constant brightness.
特許文献１に記載の発光表示板は、発光ダイオードを支持する長尺の基板を基盤支持体の凹部の底部に内装し、その上でこの基板支持体の上端を導光板に押し付ける構造であるため、厚みを要する基盤支持体を必要とし、全体の機構が大型、複雑となり、さらに配置スペースを要することとなる。 Since the light-emitting display panel described in Patent Document 1 has a structure in which a long substrate that supports a light-emitting diode is provided at the bottom of the recess of the base support, and the upper end of the substrate support is pressed against the light guide plate. Further, a substrate support requiring a thickness is required, the entire mechanism becomes large and complicated, and further, a space for arrangement is required.
本発明は、上記に鑑みてなされたもので、小型で、配置スペースを抑制した構成で隙間寸法を一定に維持し得る除電用発光素子の支持構造、除電装置及び画像形成装置を提供することを目的とする。 The present invention has been made in view of the above, and provides a light-emitting element support structure for static elimination, a static elimination apparatus, and an image forming apparatus that are small in size and can maintain a constant gap size with a configuration in which an arrangement space is suppressed. Objective.
本発明に係る除電用発光部の支持構造は、端面に入光面を有する除電用の導光棒を備えた、感光体ドラムを含むプロセスユニットを支持する本体フレームに形成され、表面の一部に除電用の発光素子を備えた基盤を有する除電用発光部を前記導光棒の入光面と前記発光素子の表面とを対面させた状態で支持する構造において、前記本体フレームに設けられ、前記基盤を前記導光棒の入光面と対面する対面方向に付勢した状態で支持するホルダを備え、前記入光面よりも所定寸法だけ突出するようにして前記プロセスユニットの前記導光棒の前記入光面側に取付けられた当て部材と前記ホルダに支持された前記基盤の表面とが、前記プロセスユニットの支持時に前記付勢力に抗して当接することを特徴とするものである。 A structure for supporting a light-emitting section for static elimination according to the present invention is formed on a main body frame that supports a process unit including a photosensitive drum and includes a light-guiding rod for static elimination that has a light incident surface on an end surface. In the structure for supporting the static elimination light emitting portion having a base provided with the static elimination light emitting element in a state where the light incident surface of the light guide bar and the surface of the light emitting element face each other, provided on the main body frame, The light guide bar of the process unit includes a holder that supports the base in a state of being biased in a facing direction facing the light incident surface of the light guide bar, and protrudes by a predetermined dimension from the light incident surface. The contact member attached to the light incident surface side and the surface of the base supported by the holder abut against the biasing force when the process unit is supported.
本発明によれば、基盤の表面の一部に備えられた発光素子の発光面と、導光棒の端面の入光面とが対面して配置される。発光面と入光面との隙間寸法の大小に応じて導光棒に入光する光量が変化する。発光素子の発光面から出射された発光光が入光面を介して導光棒に入光された後、感光体ドラム等の長手方向に亘って照射され、残留電荷を消去する。除電用発光部の基盤は、ホルダによって導光棒の入光面と対面する方向に付勢された状態で支持されており、この状態で、内装される導光棒側の当て部材が基盤に当接、すなわち付勢方向に押し込んだ位置で、導光棒が位置決めされる。なお、ホルダ及び当て部材の配置位置は、挿入方向奥側の他、プロセスユニットを内装した状態で、挿入方向の手前側となる本体フレームを開放位置から支持位置に移動させてプロセスユニットを内装支持する態様の場合、手前側の本体フレーム側にホルダを設け、かつこのホルダと対面するように当て部材を設けた態様としてもよい。このように、導光棒に固定された当て部材と発光素子を備える基盤とを相対的に当接させた状態とすることで、発光素子の発光面と導光棒の入光面との隙間寸法を決定するので、ホルダその他の部品誤差、またプロセスユニット挿入バラツキ等を考慮することなく、前記隙間寸法を一定の高精度に維持される。前記隙間寸法が一定に維持されることで、入光面から入光される光量が一定に維持される。 According to the present invention, the light emitting surface of the light emitting element provided on a part of the surface of the substrate and the light incident surface of the end surface of the light guide bar are arranged to face each other. The amount of light incident on the light guide bar changes according to the size of the gap between the light emitting surface and the light incident surface. The emitted light emitted from the light emitting surface of the light emitting element is incident on the light guide rod through the light incident surface, and then irradiated over the longitudinal direction of the photosensitive drum or the like to erase residual charges. The base of the light-emitting section for static elimination is supported in a state where it is urged by the holder in a direction facing the light incident surface of the light guide bar. The light guide bar is positioned at the abutting position, that is, the position pushed in the biasing direction. In addition to the rear side in the insertion direction, the holder and the abutting member are disposed in the interior of the process unit, and the main body frame on the near side in the insertion direction is moved from the open position to the support position to support the process unit internally. In the case of the aspect to be performed, it is good also as an aspect which provided the holder in the main body frame side of the near side, and provided the contact member so that this holder might be faced. As described above, the gap between the light emitting surface of the light emitting element and the light incident surface of the light guide bar is obtained by relatively abutting the contact member fixed to the light guide bar and the base including the light emitting element. Since the dimension is determined, the gap dimension can be maintained at a constant high accuracy without taking account of holder and other component errors and process unit insertion variations. By maintaining the gap size constant, the amount of light incident from the light incident surface is maintained constant.
また、前記ホルダは、前記プロセスユニットの挿入方向の奥側の本体フレームに形成され、前記導光棒の入光面は前記プロセスユニットの挿入方向奥側の端面であることを特徴とする。この構成によれば、挿入されるプロセスユニットの導光棒側の当て部材が基盤に当接し、付勢力に抗して押し込んだ位置で、導光棒が位置決めされる。このように、導光棒に固定された当て部材を発光素子を備える基盤に前記付勢力に抗して当接させた状態とすることで、発光素子の発光面と導光棒の入光面との隙間寸法が一定に設定される。 The holder is formed on a main body frame on the back side in the insertion direction of the process unit, and a light incident surface of the light guide bar is an end surface on the back side in the insertion direction of the process unit. According to this configuration, the light guide bar is positioned at a position where the contact member on the light guide bar side of the process unit to be inserted is in contact with the base and pushed against the urging force. As described above, the light-emitting surface of the light-emitting element and the light-incident surface of the light-guide rod are obtained by bringing the contact member fixed to the light-guide rod into contact with the base including the light-emitting element against the biasing force. The gap dimension is set to be constant.
また、前記当て部材は、前記導光棒の入光面となる端面側に取付けられていることを特徴とする。この構成によれば、導光棒の端面（入光面）と当て部材の先端との寸法精度を確保することが可能となる。 Moreover, the said contact member is attached to the end surface side used as the light-incidence surface of the said light-guide rod, It is characterized by the above-mentioned. According to this configuration, it is possible to ensure the dimensional accuracy between the end surface (light incident surface) of the light guide bar and the tip of the abutting member.
また、除電装置を、前記の除電用発光部の支持構造と、前記除電用発光部と、前記導光棒と、前記導光棒の入光面側に、前記入光面よりも所定寸法だけ突出するように前記導光棒の側部に取付けられた当て部材とを構成することで、感光体等の表面に一定の除電用光量を照射することが可能となる。また、かかる除電装置を備えた画像形成装置によって画質品質が維持される。 Further, the static eliminator is provided with a predetermined dimension on the light incident surface side of the light emitting portion for removing the static electricity, the light emitting portion for static elimination, the light guide rod, and the light guide rod. By configuring the contact member attached to the side portion of the light guide bar so as to protrude, it is possible to irradiate the surface of the photoreceptor or the like with a certain amount of charge for static elimination. Also, the image quality is maintained by the image forming apparatus provided with such a charge eliminating device.
本発明によれば、小型で、配置スペースを抑制した構成で隙間寸法を一定に維持することができる。 According to the present invention, the gap size can be kept constant with a small configuration with a reduced arrangement space.
図１に示すように、画像形成装置１００は、画像形成部１０、中間転写部２０、二次転写部３１、定着部３２、給紙部３３、用紙搬送路３４及び読取部４０を備えると共に、装置本体の上部に自動原稿搬送装置５０が搭載されている。画像形成装置１００は、読取部４０を介して読み取ったカラー又はモノクロ画像データあるいは図外の外部装置から入力されたカラー又はモノクロ画像データを用紙にカラー又は単色で画像形成処理を行う。 As shown in FIG. 1, the image forming apparatus 100 includes an image forming unit 10, an intermediate transfer unit 20, a secondary transfer unit 31, a fixing unit 32, a paper feeding unit 33, a paper conveyance path 34, and a reading unit 40. An automatic document feeder 50 is mounted on the upper part of the apparatus main body. The image forming apparatus 100 performs color or monochrome image forming processing on color or monochrome image data read via the reading unit 40 or color or monochrome image data input from an external device (not shown) on paper.
画像形成部１０は、光ビーム走査ユニット１及びそれぞれ同様な構造を有する各色の画像形成部１０Ａ〜１０Ｄ（プロセスユニット）を備えている。光ビーム走査ユニット１は、半導体レーザを備え、読取部４０で読み取られた、カラー原稿に対応するＲ、Ｇ、Ｂ色の各画素の画像データをブラック（Ｋ）、シアン（Ｃ）、マゼンタ（Ｍ）、イエロー（Ｙ）の濃度データに変換し、変換後の各濃度データに対応したデューティ比で変調されたレーザ光で画像形成部１０Ａ〜１０Ｄの感光体ドラム２Ａ〜２Ｄの表面を軸方向（主走査方向）に沿って露光走査して、それぞれの静電潜像を形成する。代表して説明する画像形成部１０Ａは、像担持体としての感光体ドラム２Ａを備え、その周囲に回転方向（副走査方向）に沿って帯電器３Ａ、現像器４Ａ及びクリーナ部５Ａを備えている。 The image forming unit 10 includes the light beam scanning unit 1 and image forming units 10A to 10D (process units) for each color having the same structure. The light beam scanning unit 1 includes a semiconductor laser, and image data of R, G, and B pixels corresponding to a color document read by the reading unit 40 is converted into black (K), cyan (C), magenta ( M) and yellow (Y) density data, and the surfaces of the photosensitive drums 2A to 2D of the image forming units 10A to 10D are axially irradiated with laser light modulated with a duty ratio corresponding to each density data after the conversion. Exposure scanning is performed along (main scanning direction) to form respective electrostatic latent images. The image forming unit 10A, which is representatively described, includes a photosensitive drum 2A as an image carrier, and includes a charger 3A, a developing unit 4A, and a cleaner unit 5A around the rotation direction (sub-scanning direction). Yes.
中間転写部２０は、中間転写ベルト２１、駆動ローラ２２、従動ローラ２３、一次転写ローラ２４Ａ〜２４Ｄを備えて、感光体ドラム２Ａ〜２Ｄの周面に形成されたトナー像（現像剤像）を、像担持体としての中間転写ベルト２１の表面に一次転写する。二次転写部３１は、中間転写ベルト２１の表面のトナー像を記録用紙へ二次転写する。定着部３２は、記録用紙に転写されたトナー像を加熱して定着し、排紙トレイに排出する。給紙部３３は、給紙カセットや手差しトレイを備えており、選択された記録用紙を、対応する給紙カセットから用紙搬送路３４に給紙する。 The intermediate transfer unit 20 includes an intermediate transfer belt 21, a driving roller 22, a driven roller 23, and primary transfer rollers 24A to 24D, and receives toner images (developer images) formed on the peripheral surfaces of the photosensitive drums 2A to 2D. Then, primary transfer is performed on the surface of the intermediate transfer belt 21 as an image carrier. The secondary transfer unit 31 secondarily transfers the toner image on the surface of the intermediate transfer belt 21 to a recording sheet. The fixing unit 32 heats and fixes the toner image transferred to the recording paper, and discharges it to the paper discharge tray. The paper feed unit 33 includes a paper feed cassette and a manual feed tray, and feeds the selected recording paper from the corresponding paper feed cassette to the paper transport path 34.
なお、図１では示されていないが、感光体ドラム２の周囲には、クリーナ５の下流側位置に除電部６が配設される。除電部６は、クリーナ５で残留トナーが回収された感光体ドラム２の表面の長手方向全域に亘って光を照射して、表面の残留電荷を消去する。 Although not shown in FIG. 1, a static elimination unit 6 is disposed around the photosensitive drum 2 at a downstream position of the cleaner 5. The neutralization unit 6 irradiates light over the entire longitudinal direction of the surface of the photosensitive drum 2 from which the residual toner has been collected by the cleaner 5 to erase the residual charge on the surface.
除電部６は、図２の実施形態に示すように、発光部６１と、発光部６１からの発光光を感光体ドラム２の長手方向全域に均一に導く導光部材としての、長尺の導光棒６２とを備えている。導光棒６２は、長尺形状を有し、一方端（図２の右方）に入光端面（図５（ｄ）参照）を有する。導光棒６２は、感光体ドラム２を支持するプロセスユニット２００側に一体的に支持されている。 As shown in the embodiment of FIG. 2, the neutralization unit 6 is a long light guide as a light guide 61 and a light guide member that uniformly guides light emitted from the light emission unit 61 to the entire longitudinal direction of the photosensitive drum 2. And a light rod 62. The light guide rod 62 has a long shape, and has a light incident end surface (see FIG. 5D) at one end (right side in FIG. 2). The light guide rod 62 is integrally supported on the process unit 200 side that supports the photosensitive drum 2.
一方、発光部６１は、図３、図４に示すように、例えば樹脂製の本体フレーム１１に装着脱可能に支持される。図３、図４に示す本体フレーム１１は、公知のように画像形成装置１００の筐体内に装備されるフレーム部の一部を構成するもので、例えば画像形成部１０の感光体ドラム２を主体としたプロセスユニット２００を軸方向の両端側（手前側と奥側）で支持する場合の、奥側に位置するフレームの一例である。本体フレーム１１は、各色のプロセスユニット２００に対応する支持部を備えており、図３では、隣接する２個の支持部が見えている。 On the other hand, as shown in FIG. 3 and FIG. A main body frame 11 shown in FIGS. 3 and 4 constitutes a part of a frame portion provided in the housing of the image forming apparatus 100 as is well known, and for example, the photoconductive drum 2 of the image forming portion 10 is mainly used. This is an example of a frame located on the back side when the process unit 200 is supported on both axial ends (front side and back side). The main body frame 11 includes support portions corresponding to the process units 200 of the respective colors. In FIG. 3, two adjacent support portions can be seen.
本体フレーム１１には、プロセスユニット２００の奥側を内嵌する支持孔１１１が形成されている。支持孔１１１の隣接位置には、ホルダ１２が形成されている。ホルダ１２は、樹脂製である本体フレーム１１の一部として形成され、除電部６の発光部６１を支持するものである。 A support hole 111 is formed in the main body frame 11 so as to be fitted into the back side of the process unit 200. A holder 12 is formed at a position adjacent to the support hole 111. The holder 12 is formed as a part of the main body frame 11 made of resin, and supports the light emitting unit 61 of the static elimination unit 6.
まず、発光部６１の構成について説明する。発光部６１は、所定長、例えば長方形状を有し、表面に給電用の配線パターン等が形成された板状の基盤６１１と、基盤６１１の表面の適所に取付けられた発光素子、例えばＬＥＤ（Light Emitting Diode）６１２と、必須ではないが、裏面の適所に設けられた所定形状、例えば箱状の回路部６１３とを有する。ＬＥＤ６１２は、図４に示すように頂部に発光面６１２ａを有している。 First, the configuration of the light emitting unit 61 will be described. The light emitting unit 61 has a predetermined length, for example, a rectangular shape, and has a plate-like base 611 having a power supply wiring pattern or the like formed on the surface thereof, and a light emitting element attached to an appropriate position on the surface of the base 611, such as an LED ( Light Emitting Diode) 612 and a predetermined shape, for example, a box-shaped circuit portion 613 provided at a suitable position on the back surface, although not essential. As shown in FIG. 4, the LED 612 has a light emitting surface 612a at the top.
ホルダ１２は、図中矢印で示す方向から発光部６１が差し込まれる構造、及び差し込まれた発光部６１を支持する構造を有する。ホルダ１２は、支持孔１１１の開口面と平行な底板部１２０を備え、底板部１２０の周囲に立設された壁部を備える。底板部１２０は、基盤６１１に対応する形状を有する。また、壁部として側面部１２１及び後面部１２２を備え、かつ底板部１２０の中央部分には、長尺の開口１２３が穿設されている。なお、開口１２３は、図５（ａ）で後述するような周縁形状を有する。 The holder 12 has a structure in which the light emitting unit 61 is inserted from the direction indicated by the arrow in the drawing and a structure that supports the inserted light emitting unit 61. The holder 12 includes a bottom plate portion 120 that is parallel to the opening surface of the support hole 111, and includes a wall portion that stands up around the bottom plate portion 120. The bottom plate part 120 has a shape corresponding to the base 611. Further, a side surface portion 121 and a rear surface portion 122 are provided as wall portions, and a long opening 123 is formed in the center portion of the bottom plate portion 120. The opening 123 has a peripheral shape as will be described later with reference to FIG.
また、対向する側面部１２１の所定高さ位置には両側壁に亘る押圧部材１２５が形成されている。押圧部材１２５は、両側の側面部１２１に支持される基部１２６と基部１２６の左右方向に延設された所定長の押圧片部１２７，１２８を有する。押圧片部１２７，１２８は、基部１２６側から先端に向けて所定の角度で開口１２３側に傾斜して形成されている。なお、図３において、互いに隣接するホルダ１２の内、右側のホルダ１２には発光部６１が未装着であり、一方、左側のホルダ１２には発光部６１が装着されている。また、図４は、発光部６１が装着されている状態を示している。 In addition, a pressing member 125 is formed across the side walls at a predetermined height position of the opposing side surface portions 121. The pressing member 125 includes a base portion 126 supported by the side surface portions 121 on both sides and pressing pieces 127 and 128 having a predetermined length extending in the left-right direction of the base portion 126. The pressing pieces 127 and 128 are formed to be inclined toward the opening 123 at a predetermined angle from the base 126 side toward the tip. In FIG. 3, among the holders 12 adjacent to each other, the light emitting unit 61 is not attached to the right holder 12, while the light emitting unit 61 is attached to the left holder 12. FIG. 4 shows a state where the light emitting unit 61 is mounted.
次に、図５を用いて、ホルダ１２による発光部６１の支持、及び発光部６１と導光棒６２との隙間寸法について説明する。図５（ａ）において、開口１２３の大きさは、基盤６１１の大きさに対応して形成されている。例えば、開口１２３は、基盤６１１の大きさに比して狭めに形成され、かつ開口１２３の四辺の複数箇所に当接縁部１２４を適宜残して、残部を基盤６１１のサイズに対応して穿設している。 Next, the support of the light emitting unit 61 by the holder 12 and the gap size between the light emitting unit 61 and the light guide rod 62 will be described with reference to FIG. In FIG. 5A, the size of the opening 123 is formed corresponding to the size of the base 611. For example, the opening 123 is formed to be narrower than the size of the base 611, and the contact edges 124 are appropriately left at a plurality of locations on the four sides of the opening 123, and the remaining part is drilled corresponding to the size of the base 611. Has been established.
また、図５（ｂ）に示すように、押圧片部１２７，１２８は、開放状態で、先端が、開口１２３に入り込む位置まで、あるいはその近傍に位置するように傾斜して延設されている。図５（ｃ）は、図の右方から発光部６１が差し込まれた状態を示している。差し込み操作は、押圧片部１２７，１２８の先端側をより開いた状態にして行われる。そして、基盤６１１の先端が後面部１２２に当接して、差し込み方向の位置決めがなされる。また、押圧片部１２７，１２８は、基盤６１１の厚さ分だけ強制的に開いた状態に弾性変形され、その結果、図５（ｃ）中、矢印で示す方向への付勢力が作用する。すなわち、発光部６１は、底板部１２０に圧接した状態で支持された状態となる。なお、押圧片部１２７，１２８は、その弾性変形によって、基盤６１１を図５（ｄ）に示すように、Ｘ方向に対して範囲Ｌｄの変動幅を有しているものとする。 Further, as shown in FIG. 5B, the pressing piece portions 127 and 128 are inclined and extended so that the distal end is located up to or near the position where it enters the opening 123. . FIG. 5C shows a state in which the light emitting unit 61 is inserted from the right side of the drawing. The insertion operation is performed with the distal end sides of the pressing piece portions 127 and 128 opened further. And the front-end | tip of the base | substrate 611 contact | abuts to the rear surface part 122, and the positioning of an insertion direction is made | formed. Further, the pressing pieces 127 and 128 are elastically deformed so as to be forcibly opened by the thickness of the base 611. As a result, an urging force in a direction indicated by an arrow acts in FIG. That is, the light emitting unit 61 is supported in a state of being pressed against the bottom plate unit 120. The pressing pieces 127 and 128 are assumed to have a fluctuation range of a range Ld with respect to the X direction as shown in FIG. 5D due to the elastic deformation of the base 611.
続いて、プロセスユニット２００が本体フレーム１１に向けて挿入されると、同時に導光棒６２も、図５（ｄ）の矢印Ｘで示す方向から挿入される。プロセスユニット２００は、本体フレーム１１の支持孔１１１に内嵌された後、所定の挿入位置に位置決め設定される。図５（ｄ）に示すように、導光棒６２は、ＬＥＤ６１２と対面する側の先端近傍に、当て部材６３を取付けている。当て部材６３は、導光棒６２の先端側で固定具６４を介して取付けられ、その先端６３１が導光棒６２の入光面６２ａから予め設定された寸法Ｈだけ突出した形状を有する。寸法Ｈは、少なくともＬＥＤ６１２の高さ寸法ｈ以上であればよい。 Subsequently, when the process unit 200 is inserted toward the main body frame 11, the light guide rod 62 is also inserted from the direction indicated by the arrow X in FIG. After the process unit 200 is fitted in the support hole 111 of the main body frame 11, the process unit 200 is positioned and set at a predetermined insertion position. As shown in FIG. 5D, the light guide bar 62 has a contact member 63 attached in the vicinity of the tip on the side facing the LED 612. The abutting member 63 is attached to the front end side of the light guide bar 62 via a fixture 64, and has a shape in which the front end 631 protrudes from the light incident surface 62 a of the light guide bar 62 by a preset dimension H. The dimension H should just be more than the height dimension h of LED612.
そして、プロセスユニット２００の本体フレーム１１への挿入に連動して導光棒６２が挿入されて所定の挿入位置で位置決めされるとき、先端６３１は、開口１２３から進入して基盤６１１を押し込むように作用する。従って、基盤６１１は先端６３１に押されて、押圧片部１２７，１２８の付勢力に抗して押し込まれる。このときの押し込み量の多少に関わらず、基盤６１１の表面と入光面６２ａとの隙間は寸法Ｈに相当し、一定であり、すなわちＬＥＤ６１２の頂部の発光面６１２ａと入光面６２ａとの隙間寸法ｄo（＝Ｈ−ｈ）は一定に維持されることとなる。隙間寸法ｄoは、導光棒６２の発光面側から感光体ドラム２に照射される除電用光量に基づいて設定されるが、一例として１ｍｍ程度である。 Then, when the light guide rod 62 is inserted in conjunction with the insertion of the process unit 200 into the main body frame 11 and positioned at a predetermined insertion position, the tip 631 enters from the opening 123 and pushes in the base 611. Works. Accordingly, the base 611 is pushed by the tip 631 and pushed against the urging force of the pressing pieces 127 and 128. Regardless of the amount of pressing at this time, the gap between the surface of the base 611 and the light incident surface 62a corresponds to the dimension H and is constant, that is, the gap between the light emitting surface 612a at the top of the LED 612 and the light incident surface 62a. The dimension do (= H−h) is kept constant. The gap dimension do is set based on the amount of charge for discharging from the light emitting surface side of the light guide bar 62 to the photosensitive drum 2, and is about 1 mm as an example.
このように、当て部材６３を入光面６２ａに近い位置で導光棒６２に取付けることで、入光面６２ａの位置に対する先端６３１の寸法精度が確保され、また、先端６３１を直接、基盤６１１に当接する構成としたので、ホルダ１２の他、周辺部品の寸法精度、またプロセスユニット２００挿入時のバラツキ等を考慮することなく、発光面６１２ａと導光棒６２の入光面６２ａとの隙間を高精度に維持できる。また、従来のように、発光素子６１２が覆われる構造ではないため熱が籠もることがなく、更に、凹部に内装するような構造ではないため、指向角の広いＬＥＤも好適に適用可能である。 Thus, by attaching the contact member 63 to the light guide rod 62 at a position close to the light incident surface 62a, the dimensional accuracy of the tip 631 with respect to the position of the light incident surface 62a is secured, and the tip 631 is directly attached to the base 611. Therefore, the gap between the light emitting surface 612a and the light incident surface 62a of the light guide bar 62 can be taken into consideration without considering the dimensional accuracy of the peripheral parts in addition to the holder 12 and the variation when the process unit 200 is inserted. Can be maintained with high accuracy. Further, unlike the conventional structure, since the light emitting element 612 is not covered, heat is not generated. Further, since the structure is not embedded in the recess, an LED having a wide directivity angle can be suitably applied. is there.
＜第２実施形態＞
図６に示す第２実施形態では、当て部材６３ａが導光棒６２を支持する支持部材６５に固定具６６を介して取付けられている。当て部材６３ａを、導光棒６２ではなく、支持部材６５に取付けることで、取り付けの自由度が増し、また、入光面６２ａに近い位置で支持部材６５に取付けることで、入光面６２ａの位置に対する先端６３１ａの寸法精度が確保される。
Second Embodiment
In the second embodiment shown in FIG. 6, the abutting member 63 a is attached to a support member 65 that supports the light guide rod 62 via a fixture 66. By attaching the contact member 63a to the support member 65 instead of the light guide rod 62, the degree of freedom of attachment increases, and by attaching the contact member 63a to the support member 65 at a position close to the light entrance surface 62a, the light entrance surface 62a The dimensional accuracy of the tip 631a with respect to the position is ensured.
＜第３実施形態＞
図７に示す第３実施形態は、ＬＥＤと導光棒との隙間をプロセスユニットの手前側（差し込み側）に配置したものである。画像形成装置１００は、手前側と奥側とに筐体を有し、その内部に前記本体フレーム１１が配置されている。本体フレーム１１は、奥側の本体フレーム１１Ａと手前側の本体フレーム１１Ｂとで構成されており、その間に、プロセスユニット６Ａを含む必要な構成要素が内装される。手前側の本体フレーム１１Ｂは、一般的であるため詳細は示していないが、一部がプロセスユニット６Ａを支持する状態にあり、他の一部が、支持位置（図７（ａ）参照）と開放位置（図７（ｂ）参照）との間を回動軸（図略）によって回動可能にされている。
<Third Embodiment>
In the third embodiment shown in FIG. 7, the gap between the LED and the light guide bar is arranged on the front side (insertion side) of the process unit. The image forming apparatus 100 includes housings on the front side and the back side, and the main body frame 11 is disposed therein. The main body frame 11 is composed of a main body frame 11A on the back side and a main body frame 11B on the near side, and necessary constituent elements including the process unit 6A are housed therebetween. The main body frame 11B on the front side is general and not shown in detail, but a part thereof is in a state of supporting the process unit 6A, and the other part is a support position (see FIG. 7A). A rotation shaft (not shown) is rotatable between the open position (see FIG. 7B).
プロセスユニット６Ａは、図７（ｂ）の矢印で示す方向（図７の左方）から挿入されて、奥側の本体フレーム１１Ａ（と本体フレーム１１Ｂの一部と）で支持された状態で、図７（ａ）に示すように、手前側の本体フレーム１１Ｂの他の一部を、開放位置から支持位置に回動させて、例えば嵌め込み型のロック部材１１０ｂを介してプロセスユニット６Ａの手前側と係合させることで、本体フレーム１１Ａ，１１Ｂ間にプロセスユニット６Ａが内装される。 The process unit 6A is inserted from the direction indicated by the arrow in FIG. 7B (left side in FIG. 7) and supported by the main frame 11A on the back side (and a part of the main frame 11B). As shown in FIG. 7A, the other part of the main body frame 11B on the front side is rotated from the open position to the support position, for example, on the front side of the process unit 6A via the fitting type lock member 110b. The process unit 6A is housed between the main body frames 11A and 11B.
プロセスユニット６Ａの導光棒６２の手前側（図７の左側）の端部側には、当て部材６３ｂが、図５（ｄ）と同様にして導光棒６２に直接取付けられ、あるいは図６と同様に支持部材６５を介して突設されている。 A contact member 63b is directly attached to the light guide bar 62 in the same manner as in FIG. 5D on the front side (left side in FIG. 7) of the light guide bar 62 of the process unit 6A. In the same manner as in FIG.
一方、本体フレーム１１Ｂの適所であって、本体フレーム１１Ｂが支持位置にセットされた状態で導光棒６２と対面する位置に、ホルダ１２が形成され、このホルダ１２に発光部６１が装着されている。そして、本体フレーム１１Ｂが支持位置にセットされると、発光部６１の基盤６１１が当て部材６３ｂに当接することで、基盤６１１が付勢力に抗して押し戻されて図５（ｄ）及び図６と同様、隙間寸法ｄoが一定に維持されることとなる。このように、発光部６１ｂ及び当て部材６３ｂの配置位置は、奥側に代えて手前側でもよく、従って、両者の当接は相対的でよい。 On the other hand, the holder 12 is formed at a proper position of the main body frame 11B and facing the light guide rod 62 in a state where the main body frame 11B is set at the support position, and the light emitting unit 61 is attached to the holder 12 Yes. Then, when the main body frame 11B is set at the support position, the base 611 of the light emitting unit 61 comes into contact with the abutting member 63b, so that the base 611 is pushed back against the urging force, and FIG. Similarly to the above, the gap dimension do is maintained constant. Thus, the arrangement position of the light emitting part 61b and the abutting member 63b may be the front side instead of the back side, and therefore the contact between them may be relative.
なお、第１実施形態では、基板６１１を開口１２３側に付勢する手段として、２個の押圧片部１２７，１２８を採用したが、押圧部材は１個でもよく、あるいは３個以上でもよい。 In the first embodiment, the two pressing pieces 127 and 128 are employed as means for urging the substrate 611 toward the opening 123. However, the pressing member may be one, or may be three or more.
また、第１実施形態では、開口１２３を基盤６１１の形状に対応させて底板部１２０の中央部全域に穿設したが、開口１２３を基盤６１１の形状に対応させず、ＬＥＤ６１２の取付位置及び当て部材６３の進入位置に対応する箇所だけ穿設する態様としてもよい。例えば、ＬＥＤ６１２用と当て部材６３用の２個の開口を穿設したものでもよい。 In the first embodiment, the opening 123 is made to correspond to the shape of the base plate 611 in the entire central portion of the bottom plate portion 120. However, the opening 123 is not made to correspond to the shape of the base plate 611, and the mounting position and the contact of the LED 612 are determined. It is good also as an aspect drilled only in the location corresponding to the approach position of the member 63. FIG. For example, two openings for the LED 612 and the abutting member 63 may be provided.
また、第１実施形態では、押圧片部１２７，１２８の付勢力を樹脂製の弾性を利用して得ているが、かかる板状ばねの他、コイルバネなど異なる種類のバネ、さらに材質として金属板を利用して弾性を作用させる付勢部材を採用してもよい。 In the first embodiment, the urging force of the pressing pieces 127 and 128 is obtained by using resin elasticity. In addition to the plate spring, different types of springs such as a coil spring, and a metal plate as a material. An urging member that causes elasticity to be applied may be employed.
また、上述の実施形態の説明は、すべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 In addition, the description of the above-described embodiment is an example in all respects, and should be considered not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.
１００ 画像形成装置
２００ プロセスユニット
１１，１１Ａ，１１Ｂ 本体フレーム
１２ ホルダ
１２５ 押圧部材
１２７，１２８ 押圧片部
２ 感光体ドラム
６，６Ａ 除電部
６１ 発光部
６１１ 基盤
６１２ ＬＥＤ（発光素子）
６１２ａ 発光面
６２ 導光棒
６２ａ 入光面
６３，６３ａ、６３ｂ 当て部材
６４ 固定具
６５ 支持部材
DESCRIPTION OF SYMBOLS 100 Image forming apparatus 200 Process unit 11, 11A, 11B Main body frame 12 Holder 125 Press member 127, 128 Press piece part 2 Photoconductor drum 6, 6A Static elimination part 61 Light emission part 611 Base 612 LED (light emitting element)
612a Light emitting surface 62 Light guide rod 62a Light incident surface 63, 63a, 63b Abutting member 64 Fixing tool 65 Support member
Claims (5)
前記本体フレームに設けられ、前記基盤を前記導光棒の入光面と対面する対面方向に付勢した状態で支持するホルダを備え、
前記入光面よりも所定寸法だけ突出するようにして前記プロセスユニットの前記導光棒の入光面側に取付けられた当て部材と前記ホルダに支持された前記基盤の表面とが、前記プロセスユニットの支持時に前記付勢力に抗して当接することを特徴とする除電用発光部の支持構造。 A neutralization unit having a base with a light-emitting element for neutralization formed on a part of the surface, formed on a body frame that supports a process unit including a photosensitive drum, having a light-guiding rod for neutralization having a light incident surface on an end surface. In the structure for supporting the light emitting part for use in a state where the light incident surface of the light guide rod and the surface of the light emitting element face each other,
A holder provided on the main body frame and supporting the base in a state of being biased in a facing direction facing the light incident surface of the light guide rod,
The process unit includes a contact member attached to the light incident surface side of the light guide rod of the process unit so as to protrude by a predetermined dimension from the light incident surface and the surface of the base supported by the holder. A structure for supporting a light-emitting section for static elimination, wherein the structure is in contact with the urging force against the biasing force.
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