JPS5466155A - Correction metod of lens illuminance unevenness - Google Patents

Correction metod of lens illuminance unevenness

Info

Publication number
JPS5466155A
JPS5466155A JP13321477A JP13321477A JPS5466155A JP S5466155 A JPS5466155 A JP S5466155A JP 13321477 A JP13321477 A JP 13321477A JP 13321477 A JP13321477 A JP 13321477A JP S5466155 A JPS5466155 A JP S5466155A
Authority
JP
Japan
Prior art keywords
lens
absorbing film
film
coated
peripheral part
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
JP13321477A
Other languages
Japanese (ja)
Inventor
Rokuro Watabe
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 JP13321477A priority Critical patent/JPS5466155A/en
Publication of JPS5466155A publication Critical patent/JPS5466155A/en
Pending legal-status Critical Current

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  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE: To correct illuminance unevenness by minimizing loss of quantity of light, by providing an absorbing film and a transmission increasing film on the surface of a lens so as to reduce the quantity of transmitted light in the central part of the lens and increase the quantity of transmitted light in the peripheral part thereof.
CONSTITUTION: The surface 7 of a lens 6 is coated with an absorbing film 9 of which thickness is the largest at its central part ϕ and decreases gradually towards the peripheral part 8 thereof. Close to this absorbing film 9 is provided a transmission increasing film 10 of which thickness increases towards the peripheral part 8. In this setting, when an original plane 5 is illuminated flatly, the relation between incident angle θ and illuminance will be as shown by dotted line (b). If the lens 6 is coated only with the absorbing film 9, the relation will be as shown by by solid line (a). Therefore, when the lens 6 is coated with absorbing film 9 and transmission increasing film 10, the illuminance is even, and the loss of quantity of light is small.
COPYRIGHT: (C)1979,JPO&Japio
JP13321477A 1977-11-07 1977-11-07 Correction metod of lens illuminance unevenness Pending JPS5466155A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13321477A JPS5466155A (en) 1977-11-07 1977-11-07 Correction metod of lens illuminance unevenness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13321477A JPS5466155A (en) 1977-11-07 1977-11-07 Correction metod of lens illuminance unevenness

Publications (1)

Publication Number Publication Date
JPS5466155A true JPS5466155A (en) 1979-05-28

Family

ID=15099385

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13321477A Pending JPS5466155A (en) 1977-11-07 1977-11-07 Correction metod of lens illuminance unevenness

Country Status (1)

Country Link
JP (1) JPS5466155A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56106209A (en) * 1980-01-28 1981-08-24 Furukawa Electric Co Ltd:The Correcting method for light quantity distribution of rod lens
JPS6161101A (en) * 1984-08-31 1986-03-28 Takashi Mori Condenser lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56106209A (en) * 1980-01-28 1981-08-24 Furukawa Electric Co Ltd:The Correcting method for light quantity distribution of rod lens
JPS6161101A (en) * 1984-08-31 1986-03-28 Takashi Mori Condenser lens
JPH0449681B2 (en) * 1984-08-31 1992-08-12 Takashi Mori

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