JPS62201765U

JPS62201765U -

Info

Publication number: JPS62201765U
Application number: JP7520487U
Authority: JP
Priority date: 1987-05-21
Filing date: 1987-05-21
Publication date: 1987-12-23

Description

[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

[Scope of utility model registration request]

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.