JPS5662269A - Illumination device - Google Patents

Illumination device

Info

Publication number
JPS5662269A
JPS5662269A JP13918179A JP13918179A JPS5662269A JP S5662269 A JPS5662269 A JP S5662269A JP 13918179 A JP13918179 A JP 13918179A JP 13918179 A JP13918179 A JP 13918179A JP S5662269 A JPS5662269 A JP S5662269A
Authority
JP
Japan
Prior art keywords
layers
substrate
light
filter
light source
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
JP13918179A
Other languages
Japanese (ja)
Inventor
Tetsuo Kyogoku
Masayuki Mino
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP13918179A priority Critical patent/JPS5662269A/en
Publication of JPS5662269A publication Critical patent/JPS5662269A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE: To adjust the spectral characteristic with a simple constitution and prevent overheat, by providing an adjusting material, which adjusts the spectral characteristic of the light from the light source, between the light source and the original.
CONSTITUTION: Filter 4 is provided between light source 2 and original 6. In this filter 4, adjusting layer 11 formed with four layers of dielectric thin films is formed of the upper face of substrate 10 consisting of transparent materials such as glass, and heat ray reflecting layer 12 formed with four layers of dielectric thin films is formed on the lower face of substrate 10. In respect to adjusting 11, MgF2 and TiO2 are laminated alternately from the substrate 10 side into four layers to lower the red light quantity of the long wave length region from approximately 600nm. Meanwhile, in respect to heat ray reflecting layer 12, MgF2 and TiO2 are laminated alternately from the substrate 10 side into four layers to lower the light quantity of heat rays of the long wave length region from approximately 900nm. By this constitution, the light which passed through filter 4 causes the spectral characteristic of the copying machine to approach the relative visibility curve, so that overheat of original stand glass 5 can be prevented.
COPYRIGHT: (C)1981,JPO&Japio
JP13918179A 1979-10-26 1979-10-26 Illumination device Pending JPS5662269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13918179A JPS5662269A (en) 1979-10-26 1979-10-26 Illumination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13918179A JPS5662269A (en) 1979-10-26 1979-10-26 Illumination device

Publications (1)

Publication Number Publication Date
JPS5662269A true JPS5662269A (en) 1981-05-28

Family

ID=15239440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13918179A Pending JPS5662269A (en) 1979-10-26 1979-10-26 Illumination device

Country Status (1)

Country Link
JP (1) JPS5662269A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4684237A (en) * 1985-09-27 1987-08-04 Xerox Corporation Scan assembly moved between alternate positions to prevent platen overheating
US4865405A (en) * 1987-12-10 1989-09-12 Minolta Camera Kabushiki Kaisha Optical filter
US5063404A (en) * 1990-12-03 1991-11-05 Xerox Corporation Document illumination assembly adapted to reduce platen overheating

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4684237A (en) * 1985-09-27 1987-08-04 Xerox Corporation Scan assembly moved between alternate positions to prevent platen overheating
US4865405A (en) * 1987-12-10 1989-09-12 Minolta Camera Kabushiki Kaisha Optical filter
US5063404A (en) * 1990-12-03 1991-11-05 Xerox Corporation Document illumination assembly adapted to reduce platen overheating

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