To adopt a white light LED of high luminance suitable for use in a linear illumination device, as a light source of an original document reader in terms of securing color reproducibility, by overcoming the problem that the classification is performed by the chromaticity of the synthetic light of the light emitting color of a blue light emitting chip and a complementary color emitted by exciting a phosphor and the variance of a light emitting spectrum, especially the peak wavelength of blue light, is large.
In the illumination device and the image reading apparatus, the white LED 31 of the high luminance classified by the chromaticity, the phosphor for emitting the complementary color of the blue light among light from the white LED 31, an optical filter 70 for attenuating the light from a blue LED 41 among the light from the white LED 31, and the blue LED 41 classified by the peak wavelength complementing attenuation light from the blue LED 41 are used as the light source.
| JPS62140547 | IMAGE INFORMATION PROCESSOR |
| JP2022146492 | IMAGE READING DEVICE AND IMAGE FORMING APPARATUS |
| JP3736562 | IMAGE DATA PROCESSING APPARATUS |
Hiroki Naito
Daisuke Nagano