Image reader

Details Image reader Image reader

1994-11-28

1996-07-30

Oberley, Alvin E.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

358500, H01J 162

Patent

active

055414761

ABSTRACT:
A color film image reader for obtaining an image signal from a color film, comprising a light source for irradiating the color film with light; a color CCD for producing blue, green and red image signals from the light received from the color film; and means for adjusting the level of each of the image signals obtained by the color CCD. The light source comprises a 3-band type fluorescent lamp, and the relative emission powers thereof regarding blue, green and red light are approximately at a ratio of 10:4:1, wherein the molar weight ratios of its blue, green and red fluorescent materials satisfy the functions that (molar weight ratio of blue fluorescent material.quantum efficiency of blue fluorescent material):(molar weight ratio of green fluorescent material.quantum efficiency of green fluorescent material).(molar weight ratio of red fluorescent material.quantum efficiency of red fluorescent material).apprxeq.10:4:1. The glue fluorescent material is composed of BaM.sub.g2 Al.sub.16 O.sub.27 :Eu; the green fluorescent material is composed of La.sub.2 O.sub.3.0.2SiO.sub.2.0.9P.sub.2 O.sub.5 :Ce,Tb; and the red fluorescent material is composed of 3.5MgO.0.5MgF.sub.2 /GeO.sub.2 :Mn.sup.4+.

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