JPS5454023A - Illumination distribution compensating device for copier - Google Patents

Illumination distribution compensating device for copier

Info

Publication number
JPS5454023A
JPS5454023A JP12019477A JP12019477A JPS5454023A JP S5454023 A JPS5454023 A JP S5454023A JP 12019477 A JP12019477 A JP 12019477A JP 12019477 A JP12019477 A JP 12019477A JP S5454023 A JPS5454023 A JP S5454023A
Authority
JP
Japan
Prior art keywords
lens
illumination
aperture
light
compensated
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
JP12019477A
Other languages
Japanese (ja)
Inventor
Masami Emoto
Nobuo Sakuma
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 JP12019477A priority Critical patent/JPS5454023A/en
Publication of JPS5454023A publication Critical patent/JPS5454023A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Systems Of Projection Type Copiers (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

PURPOSE:To compensate illumination distribution to uniformalize the exposure by providing a focusing system with an aperture which has its aperture variable. CONSTITUTION:The light from a light source 4, which is positioned at the focal point of a reflecting plate 3 of two-dimentional curve, is reflected upon a rocking reflecting plate 5 to scan and illuminate an original surface 1. The reflected light resulting from the illumination is focused upon a photographic element 6 by the action of a lens 7 which is moving along an axis X. In this instance, an aperuture 9 is moved in accordance with the movement of the lens 7 so that the effective area of an opening 8 is varied. Thus, the illumination is compensated in accordance with the height of an object with respect to the optical axis so that the deficiency in the quantity of the surrounding light is compensated by the aperture efficiency of the lens 7 and the law of fourth power of cosine. As a result, the satisfactory latent image due to the uniform exposure can be formed on the durm 6.
JP12019477A 1977-10-06 1977-10-06 Illumination distribution compensating device for copier Pending JPS5454023A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12019477A JPS5454023A (en) 1977-10-06 1977-10-06 Illumination distribution compensating device for copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12019477A JPS5454023A (en) 1977-10-06 1977-10-06 Illumination distribution compensating device for copier

Publications (1)

Publication Number Publication Date
JPS5454023A true JPS5454023A (en) 1979-04-27

Family

ID=14780230

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12019477A Pending JPS5454023A (en) 1977-10-06 1977-10-06 Illumination distribution compensating device for copier

Country Status (1)

Country Link
JP (1) JPS5454023A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61114220A (en) * 1984-11-09 1986-05-31 Canon Inc Image formation optical system
JPH02163773A (en) * 1988-12-19 1990-06-25 Asahi Optical Co Ltd Light quantity correcting device for copying machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61114220A (en) * 1984-11-09 1986-05-31 Canon Inc Image formation optical system
JPH0238929B2 (en) * 1984-11-09 1990-09-03 Canon Kk
JPH02163773A (en) * 1988-12-19 1990-06-25 Asahi Optical Co Ltd Light quantity correcting device for copying machine

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