| 摘要 |
PURPOSE:To reduce the number of components and to make a device thin in wall by forming an image on an original through a transparent substrate, arranging a light emitting element on the same plane as an image sensor or its side face and using a refraction or reflecting means to illuminate the original face. CONSTITUTION:A luminous flux coming from the light emitting element 11 transmits through the transparent substrate 12 and reaches a boundary face 19 between the transparent substrates 12 and 14. By selecting the refractive index n2 of the substrate 14 to be larger than the reflective index n1 of the substrate 12, the light path 16 is refracted to the right and the light passes through the substrate 14 is radiated on an original 17. The image on the original 17 is formed on the photodetector 13 through a lens formed semishperically by a substance having a higher refractive index than that of the substrate 14 or a microlens 15 by a zone plate. Thus, the luminous flux of the element 11 is bent toward the original face by refraction to increase the illuminance of the original.
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