Patent ID: 9164200
Filing Date: 2015-10-20
Classification: B29D,G02B

Abstract:
1. An optical element comprising: an optical functional surface including an optical axis; and a cut end surface at an outer circumference of the optical functional surface, wherein: the optical functional surface has a first antireflection structure configured to reduce reflection of light, the cut end surface has a second antireflection structure configured to reduce reflection of light, a reflectance of the second antireflection structure with respect to light having a predetermined wavelength is higher than a reflectance of the first antireflection structure with respect to light having the predetermined wavelength, the second antireflection structure includes a plurality of raised portions, a flat surface is formed at a top portion of each of the raised portions, recessed portions are each formed by being surrounded by the raised portions, a flat surface is formed on a bottom of each of the recessed portions, and a distance between the flat surface of the raised portion and the flat surface of the recessed portion in a direction of the optical axis is substantially a half of the predetermined wavelength to increase the reflectance of the second antireflection structure with respect to the light having the predetermined wavelength.