JPS62201765U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は電子写真装置の概略構成の説明図、第
２図は必要画像部と不要な静電潜像領域との関係
を例示した感光体の展開図、第３図は本考案の一
実施例の図式図、第４図は第３図の実施例の制御
タイミングチヤート、第５図は第３図に示す実施
例の機械的構成の一例を示す一部断面略図である
。 １……感光体ドラム、２……帯電装置、３……
露光装置、４……現像装置、５……転写装置、６
及び６′……クリーニング装置、７，８……末端
不要部、９，９′……像間不要部、１０……発光
装置、１０１〜１０８……発光ユニツト、Ｓ１〜
Ｓ８……スイツチ、２０，２１……必要画像部。 FIG. 1 is an explanatory diagram of the schematic configuration of an electrophotographic apparatus, FIG. 2 is a developed view of a photoreceptor illustrating the relationship between a necessary image area and an unnecessary electrostatic latent image area, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a control timing chart of the embodiment shown in FIG. 3, and FIG. 5 is a schematic partial cross-sectional view showing an example of the mechanical configuration of the embodiment shown in FIG. 3. 1... Photosensitive drum, 2... Charging device, 3...
Exposure device, 4... Development device, 5... Transfer device, 6
and 6'... Cleaning device, 7, 8... End unnecessary part, 9, 9'... Inter-image unnecessary part, 10... Light emitting device, 101-108... Light emitting unit, S1...
S8...Switch, 20, 21...Required image section.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 電子写真装置の感光体を帯電後露光する前又は
露光後現像する前に感光体上に光を照射して不要
な静電潜像領域に対応する感光体領域の電荷を消
去する装置において、それぞれが発光ダイオード
を含む幾つかの発光ユニツトを感光体の幅方向に
ほぼ直線的に配列した発光装置を用い、原稿サイ
ズ、複写サイズ、転写用紙サイズ等に応じて定ま
る感光体上の不要な潜像領域のうち、感光体の幅
方向の末端不要部についてはこれに対応する末端
発光ユニツトの発光ダイオードを連続的に発光さ
せて消去し、残りの像間不要部については上記末
端発光ユニツト以外の発光ユニツトの発光ダイオ
ードを当該像間不要部の到来時期に合せて対応す
る時間長さだけ点灯させることを特徴とする不要
な静電潜像領域の消去装置。 In an apparatus for erasing charges on a photoreceptor area corresponding to an unnecessary electrostatic latent image area by irradiating light onto the photoreceptor after charging the photoreceptor before exposing it or after exposing it and before developing it, respectively. uses a light-emitting device in which several light-emitting units, including light-emitting diodes, are arranged almost linearly in the width direction of the photoreceptor, and eliminates unnecessary latent images on the photoreceptor depending on the original size, copy size, transfer paper size, etc. Among the areas, unnecessary parts at the ends in the width direction of the photoreceptor are erased by continuously emitting light from the light emitting diodes of the corresponding end light emitting units, and the remaining unnecessary parts between the images are erased by light emitting from devices other than the above end light emitting units. An apparatus for erasing an unnecessary electrostatic latent image area, characterized in that a light emitting diode of the unit is turned on for a corresponding length of time in accordance with the timing of arrival of the unnecessary area between the images.