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JPS5654456A - Fog preventing method - Google Patents

Fog preventing method

Info

Publication number
JPS5654456A
JPS5654456A JP13112979A JP13112979A JPS5654456A JP S5654456 A JPS5654456 A JP S5654456A JP 13112979 A JP13112979 A JP 13112979A JP 13112979 A JP13112979 A JP 13112979A JP S5654456 A JPS5654456 A JP S5654456A
Authority
JP
Japan
Prior art keywords
photoreceptor
use number
developer
accordance
polarity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13112979A
Other languages
Japanese (ja)
Inventor
Kimio Nakahata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP13112979A priority Critical patent/JPS5654456A/en
Priority to US06/191,030 priority patent/US4402591A/en
Priority to GB8031336A priority patent/GB2062548B/en
Priority to DE19803036731 priority patent/DE3036731A1/en
Publication of JPS5654456A publication Critical patent/JPS5654456A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To obtain an always fogfree image, by changing bias voltage to be applied to a control grating in accordance with a repeated use number of a photoreceptor or a developer, and converting polarity of toner charge attached to the photoreceptor into the opposite one.
CONSTITUTION: A rotation number of a drum or a sleeve roller is measured in accordance with use number total 21 of a photoreceptor or use number total 22 of a developer. An output value of bias voltage source 23 is gradually changed to change potential of control grating 24 of corona discharger 17 prior to transfer. As a result, when the use number of the photoreceptor or the developer rises, the bias voltage rises in accordance with its rise, an accelerating electric field of corona discharge reverse in polarity to a charged toner is always active, thus permitting a fogging toner to be converted in polarity, and an always fogfree copy image to be obtained without being transferred by it.
COPYRIGHT: (C)1981,JPO&Japio
JP13112979A 1979-09-29 1979-10-11 Fog preventing method Pending JPS5654456A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP13112979A JPS5654456A (en) 1979-10-11 1979-10-11 Fog preventing method
US06/191,030 US4402591A (en) 1979-09-29 1980-09-26 Electrophotographic apparatus
GB8031336A GB2062548B (en) 1979-09-29 1980-09-29 Electrophotographic apparatus
DE19803036731 DE3036731A1 (en) 1979-09-29 1980-09-29 ELECTROPHOTOGRAPHIC DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13112979A JPS5654456A (en) 1979-10-11 1979-10-11 Fog preventing method

Publications (1)

Publication Number Publication Date
JPS5654456A true JPS5654456A (en) 1981-05-14

Family

ID=15050654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13112979A Pending JPS5654456A (en) 1979-09-29 1979-10-11 Fog preventing method

Country Status (1)

Country Link
JP (1) JPS5654456A (en)

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