| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical element that suppresses variation in optical characteristics due to reflow processing. SOLUTION: The optical element is formed principally of a thermosetting resin, wherein when a refractive index is measured in a state of a plate type molding which has a heat conductivity of at least 0.4 W/mK and a thickness of 3 mm, a refractive index distribution value X along the thickness of the plate type molding satisfies a condition of formula (1) of X=∫¾nd-n¾×ω(n)dn/∫ω(n)dn<1.3×10<SP>-3</SP>, wherein nd is a refractive index on a d-line of a main peak, n is an optional index within a range of nd±0.01, and ω(n) is intensity at a refractive index n. COPYRIGHT: (C)2010,JPO&INPIT
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