JPS55126263A - Variable magnification optical device - Google Patents

Variable magnification optical device

Info

Publication number
JPS55126263A
JPS55126263A JP3395879A JP3395879A JPS55126263A JP S55126263 A JPS55126263 A JP S55126263A JP 3395879 A JP3395879 A JP 3395879A JP 3395879 A JP3395879 A JP 3395879A JP S55126263 A JPS55126263 A JP S55126263A
Authority
JP
Japan
Prior art keywords
variable magnification
original
hence
light source
change
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
JP3395879A
Other languages
Japanese (ja)
Inventor
Yoshikuni Toyama
Tadayuki Kitajima
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 JP3395879A priority Critical patent/JPS55126263A/en
Publication of JPS55126263A publication Critical patent/JPS55126263A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a fixed image plane illuminance irrespective of copying magnifications by changing original plane luminance distributions through the utilization of the deviation of the object point position relating to the main rays on the original surface at the time of variable magnification hence the change in the distance from a light source.
CONSTITUTION: The original surface is lighted by a light source 3 and reflecting mirrors 4, 5. The rays from the original 2 are reflected by a reflecting mirror 6 near the original surface side and a reflecting mirror 7 remote from the original surface and pass through a fixed focus lens 8, after which they are reflected by reflecting mirrors 9, 10, pass through a slit 11 and image on a drum surface 1. At the time of variable magnification, the respective reflecting mirrors and lens 8 are specifically displaced by utilizing the deflection of the object point relating to the main rays hence the change in the distance from the light source, whereby the scanning is done and the deviation of the object point is compensated. Hence, it is possible to change the luminance in the normal direction of the object surface at the time of variable magnification and make the image plane illuminance constant irrespective of copying magnifications.
COPYRIGHT: (C)1980,JPO&Japio
JP3395879A 1979-03-23 1979-03-23 Variable magnification optical device Pending JPS55126263A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3395879A JPS55126263A (en) 1979-03-23 1979-03-23 Variable magnification optical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3395879A JPS55126263A (en) 1979-03-23 1979-03-23 Variable magnification optical device

Publications (1)

Publication Number Publication Date
JPS55126263A true JPS55126263A (en) 1980-09-29

Family

ID=12400990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3395879A Pending JPS55126263A (en) 1979-03-23 1979-03-23 Variable magnification optical device

Country Status (1)

Country Link
JP (1) JPS55126263A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59128504A (en) * 1983-01-13 1984-07-24 Tokyo Optical Co Ltd Variable power mechanism of optical device
JPH06334501A (en) * 1993-05-20 1994-12-02 Nec Corp Phase comparing circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5392126A (en) * 1977-01-25 1978-08-12 Ricoh Co Ltd Exposure regulator for variable magnification copying machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5392126A (en) * 1977-01-25 1978-08-12 Ricoh Co Ltd Exposure regulator for variable magnification copying machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59128504A (en) * 1983-01-13 1984-07-24 Tokyo Optical Co Ltd Variable power mechanism of optical device
JPH0454932B2 (en) * 1983-01-13 1992-09-01 Topcon Corp
JPH06334501A (en) * 1993-05-20 1994-12-02 Nec Corp Phase comparing circuit

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