JPS569762A - Slit scanning optical system - Google Patents

Slit scanning optical system

Info

Publication number
JPS569762A
JPS569762A JP8517679A JP8517679A JPS569762A JP S569762 A JPS569762 A JP S569762A JP 8517679 A JP8517679 A JP 8517679A JP 8517679 A JP8517679 A JP 8517679A JP S569762 A JPS569762 A JP S569762A
Authority
JP
Japan
Prior art keywords
face
lens system
optical system
formula
conjugate
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
JP8517679A
Other languages
Japanese (ja)
Inventor
Kazuo Minoura
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 JP8517679A priority Critical patent/JPS569762A/en
Priority to DE19803025468 priority patent/DE3025468A1/en
Publication of JPS569762A publication Critical patent/JPS569762A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE: To reduce movement length of a movable lens group for purpose of scanning per the same scanning width, by endowing an image forming optical system with a function for reducing the scanning width in the slit scanning optical system of a copier.
CONSTITUTION: This image forming optical system consists of the first fixed lens system 4 and the second movable lens system 5, for example, for rendering face 1 (the face to be scanned) and the second face 2 (the light receiving face) in a conjugate relation. Face 1 and the third face 3 are made in a conjugate relation by lens system 4, and face 3 and face 2 are rendered in a conjugate relations by lens system 5. Individual magnifications of lens systems 4, 5 in these conjugate relations are β1, β2, respectively, point Q1 (slit) moved by distance L1 is focused on point P2 (the light receiving position) by moving lens system 5 by Δh2, and then formula (1) holds with respect to Δh2. Where β1, β2=-1, and O<β1<1, formula (1) becomes formula (2), permitting the movement length of movable lens system 5 to be reduced.
COPYRIGHT: (C)1981,JPO&Japio
JP8517679A 1979-07-05 1979-07-05 Slit scanning optical system Pending JPS569762A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP8517679A JPS569762A (en) 1979-07-05 1979-07-05 Slit scanning optical system
DE19803025468 DE3025468A1 (en) 1979-07-05 1980-07-04 Compressed movement scanner for photocopier - has two sets of lenses with relative orthogonal movement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8517679A JPS569762A (en) 1979-07-05 1979-07-05 Slit scanning optical system

Publications (1)

Publication Number Publication Date
JPS569762A true JPS569762A (en) 1981-01-31

Family

ID=13851343

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8517679A Pending JPS569762A (en) 1979-07-05 1979-07-05 Slit scanning optical system

Country Status (1)

Country Link
JP (1) JPS569762A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53122426A (en) * 1977-03-31 1978-10-25 Canon Inc Projector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53122426A (en) * 1977-03-31 1978-10-25 Canon Inc Projector

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