JPS54133140A - Photoreceptor exposure adjusting method in copying machine - Google Patents

Photoreceptor exposure adjusting method in copying machine

Info

Publication number
JPS54133140A
JPS54133140A JP4060978A JP4060978A JPS54133140A JP S54133140 A JPS54133140 A JP S54133140A JP 4060978 A JP4060978 A JP 4060978A JP 4060978 A JP4060978 A JP 4060978A JP S54133140 A JPS54133140 A JP S54133140A
Authority
JP
Japan
Prior art keywords
exposure
illumination
incident angle
slit
image plane
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.)
Granted
Application number
JP4060978A
Other languages
Japanese (ja)
Other versions
JPS5836890B2 (en
Inventor
Yukio Ogura
Masami Emoto
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4060978A priority Critical patent/JPS5836890B2/en
Publication of JPS54133140A publication Critical patent/JPS54133140A/en
Publication of JPS5836890B2 publication Critical patent/JPS5836890B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Control Of Exposure In Printing And Copying (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

PURPOSE: To realize elimination of exposure unevenness regardless of reciprocity law of photoreceptor, by changing the quantity of emission of illumination lamp of illumination optical system depending on the changes in the incident angle of the exposure luminous flux into the imaging lens system.
CONSTITUTION: In the event of slit exposure, since the incident angle θ of the exposure luminous flux into an imaging lens system 2 varies continuously during exposure, the vignetting factor differs according to th cosine fourth power law. As the incident angle θ becomes larger, the image plane illumination of optical image at exposure position P lowers. With the image plane illumination at incident angle θ=O taken as 100%, in order to image at the exposure position P at image plane illumination 100% when θ is not O, that is, to achieve slit exposure under the same condition, it is enough to change the quantity of emission of the illumination lamp in a way that the illumination of the slit-form lighting part may change as shown in the drawing according to the variation of the incident angle θ. In paractice, by changing the applied voltage to the illumination lamps 42, 52 depending on the incident angle θ, exposure may be performed always under the same conditions, so that unevenness of exposure may be eliminated.
COPYRIGHT: (C)1979,JPO&Japio
JP4060978A 1978-04-06 1978-04-06 How to adjust photoreceptor exposure in a copying machine Expired JPS5836890B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4060978A JPS5836890B2 (en) 1978-04-06 1978-04-06 How to adjust photoreceptor exposure in a copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4060978A JPS5836890B2 (en) 1978-04-06 1978-04-06 How to adjust photoreceptor exposure in a copying machine

Publications (2)

Publication Number Publication Date
JPS54133140A true JPS54133140A (en) 1979-10-16
JPS5836890B2 JPS5836890B2 (en) 1983-08-12

Family

ID=12585255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4060978A Expired JPS5836890B2 (en) 1978-04-06 1978-04-06 How to adjust photoreceptor exposure in a copying machine

Country Status (1)

Country Link
JP (1) JPS5836890B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287147A (en) * 1991-01-25 1994-02-15 Canon Kabushiki Kaisha Original scanning apparatus with fixed light source

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287147A (en) * 1991-01-25 1994-02-15 Canon Kabushiki Kaisha Original scanning apparatus with fixed light source

Also Published As

Publication number Publication date
JPS5836890B2 (en) 1983-08-12

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