OPTICAL GLASS AND OPTICAL ELEMENT
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United States of America
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Issued Date -
Feb 13, 2025
app pub date -
Jul 31, 2024
filing date -
Jul 31, 2024
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Abstract
There is provided an optical glass, in which a refractive index (nd) at a wavelength of the d line of helium (587.6 nm) is in a range of 1.45000 to 1.65000; an ISO color contribution index ISO/CCI is 0.00 for blue (B), 0.80 or less for green (G), and 0.80 or less for red (R); and an S value is 0.70×106 or more and less than 1.03×106 (Pa/° C.), the S value being obtained by the equation: S=E·α/(1−ν), in which E is Young's modulus (unit: GPa); α is an average coefficient of linear expansion in a temperature range of 100° C. to 300° C. (unit: 10−7° C.−1); and ν is Poisson's ratio.
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