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US 2025/0051220 A1Published application
Optical glass and optical element
AssigneeKabushiki Kaisha Ohara
InventorsRina Nagashima, Fumihiro Oguri
Life of this patent
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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.
Claims9
An optical glass,
- wherein 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 obtained by the following equation (1) is 0.70×106 or more and less than 1.03×106 (Pa/° C.),
- S=E·α/(1−ν) Equation (1), 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.
6 more elements
Dependencies are inferred from the claim text.