LIGHT-EMITTING UNIT, AND LIGHTING DEVICE AND IMAGE READER USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting unit with reflection efficiency within the unit enhanced for an increase in the amount of light from a lighting device.

SOLUTION: A blue or green light-emitting element 23a or 23c is translucent and is bonded to a lead frame 22b with a transparent epoxy resin 27. The use of the transparent epoxy resin 27 as a bonding agent allows light after travelling through the inside of the light-emitting element 23a or 23c, out of the light emitted by the light-emitting element 23a or 23c, to be reflected from the silver-plated surface of the lead frame 22b. The reflected light travels again in the light-emitting element 23a or 23c for emission from the front face, consequently increasing the amount of light emission.

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