JPS57111559A - Exposing method of variable magnification type copier - Google Patents

Exposing method of variable magnification type copier

Info

Publication number
JPS57111559A
JPS57111559A JP18664880A JP18664880A JPS57111559A JP S57111559 A JPS57111559 A JP S57111559A JP 18664880 A JP18664880 A JP 18664880A JP 18664880 A JP18664880 A JP 18664880A JP S57111559 A JPS57111559 A JP S57111559A
Authority
JP
Japan
Prior art keywords
displaced
roof
displacement
copying
variable magnification
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
JP18664880A
Other languages
Japanese (ja)
Inventor
Junichi Oota
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 JP18664880A priority Critical patent/JPS57111559A/en
Publication of JPS57111559A publication Critical patent/JPS57111559A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/041—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with variable magnification

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE:To vary optical path length without varying a slit exposure part by providing the object side and image side of an imaging lens system each with one roof prism movably, and by displaying the roof prism linearly for a change in copying magnification. CONSTITUTION:For copying with contraction magnification (m) (m<1), a roof mirror 10 is displaced to a position 10', and a roof mirror 12 is also displaced to a position 12'. In this case, the extents (a) and (b) of displacement are f(1-m)/ 2m and f/2(1-m), respectively, where (f) is the focal length of an imaging lens system 11. For copying with enlargement magnification (m') (m'>1), the roof mirror 10 is displaced to a position 10'', and the roof mirror 12 is also displaced to a position 12''. Their extents of displacement are c=f(m'-1)/2m' and d=f/2 (m'-1), respectively. In the displacement, a slit exposure part P is not varied.
JP18664880A 1980-12-27 1980-12-27 Exposing method of variable magnification type copier Pending JPS57111559A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18664880A JPS57111559A (en) 1980-12-27 1980-12-27 Exposing method of variable magnification type copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18664880A JPS57111559A (en) 1980-12-27 1980-12-27 Exposing method of variable magnification type copier

Publications (1)

Publication Number Publication Date
JPS57111559A true JPS57111559A (en) 1982-07-12

Family

ID=16192253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18664880A Pending JPS57111559A (en) 1980-12-27 1980-12-27 Exposing method of variable magnification type copier

Country Status (1)

Country Link
JP (1) JPS57111559A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5185822A (en) * 1988-06-16 1993-02-09 Asahi Kogaku Kogyo K.K. Focusing structure in an information reading apparatus
US11866279B2 (en) 2018-05-17 2024-01-09 Lg Chem, Ltd. Film wrinkle removing roller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825538A (en) * 1971-08-02 1973-04-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825538A (en) * 1971-08-02 1973-04-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5185822A (en) * 1988-06-16 1993-02-09 Asahi Kogaku Kogyo K.K. Focusing structure in an information reading apparatus
US11866279B2 (en) 2018-05-17 2024-01-09 Lg Chem, Ltd. Film wrinkle removing roller

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