FRESNEL LENS, A FLASH MODULE AND A DIGITAL IMAGE PROCESSING APPARATUS COMPRISING THE SAME, CAPABLE OF ENHANCING THE LIGHT TRANSMITTANCE OF FRESNEL LENS

摘要

PURPOSE: A fresnel lens, a flash module and a digital image processing apparatus comprising the same are provided to prevent a light diffusion effect from becoming reduced due to the pattern deformation by external shock by the pattern of a Fresnel lens installed in the inside.;CONSTITUTION: A flash module(130) comprises a fresnel lens(131), a reflecting part(133) and a light-emitting part(135). The Fresnel lens comprises at least one protrusion formed on at least one side of the Fresnel lens in a nano dimension. The protrusion is repetitively patterned on one side of the Fresnel lens. Each height of the protrusions is lower than the size of the wavelength of the visible light area of the light. Each height of the protrusions is higher than 250nm and lower than 300nm. The cross-sectional shape of the height direction of the protrusion has an oval, parabola or cone shape.;COPYRIGHT KIPO 2011