10 April 1995 Contact-type full-color reading system using three-color solid state illuminators
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This paper reports a new contact-type, full-color reading system for compact color facsimiles. This system mainly consists of a direct-contact type image sensor and bright 3-color LED arrays. As the sensor does not require an optical lens system like a rod lens, no color aberrations occur, making this system suitable for color reading. Recent advances in brightness for blue LED have made a 3-color solid state document illuminator possible. An LED illuminator is superior to a fluorescent lamp in uniform illumination, compactness, and longevity. Specifically two points of system structure have been researched. One is an optical system design based on the light transfer performances. The second is a 3-color illuminating method which can reproduce color accurately with high speed scanning. The main experimental results are: (1) reading speed per line is 15 msec which is acceptable for G3 class color facsimile, and (2) resolution is 0.5 at 8 line/mm of spatial frequency for RGB color bar- chart, (3) color difference is 12 which is slightly higher than that of the ordinary systems but can be easily improved through signal processing techniques. Therefore, the proposed reading system is possible for application in compact color facsimiles.
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Kazumi Komiya, Kazumi Komiya, Narinobu Satoh, Narinobu Satoh, "Contact-type full-color reading system using three-color solid state illuminators", Proc. SPIE 2415, Charge-Coupled Devices and Solid State Optical Sensors V, (10 April 1995); doi: 10.1117/12.206511; https://doi.org/10.1117/12.206511


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