Fluorophosphate glass, glass preform, optical element, and optical instrument provided with optical element
A technology of fluorophosphate glass and glass prefabrication, which is applied in the field of fluorophosphate glass, and can solve the problems of difficult machinability, low softening point, and high abrasion of optical glass
Active Publication Date: 2019-08-23
CDGM OPTICAL GLASS
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[0002] Fluorophosphate optical glass is a special optical glass with low dispersion, which can eliminate secondary spectral chromatic aberration, improve the imaging quality of optical lenses, and has a low softening point, and can be made into aspheric lenses by one or two pressings , is an excellent optical material for the production of advanced digital products, so it has a high demand, especially low-dispersion colorless fluorophosphate optical glass with a refractive index nd between 1.52 and 1.60 and an Abbe number vd not less than 68. Some optical glasses have a high degree of abrasion, which makes their machinability difficult, which seriously affects the accuracy of the instrument
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[0024] Embodiments of the present invention are described in detail below, and the embodiments described below are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0025] Unless otherwise indicated in a specific case, the numerical ranges set forth herein include upper and lower limits, "above" and "below" include the endpoints, and all integers and fractions within the range are not limited to the defined Specific values listed when in range. The term "and / or" herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.
[0026] In addition, the ionic value of each component described below is a representative value used for convenience, and does not differ from other ionic valences. The ion valence of each component in optical glass may be other than the representative value. For example, P usually exists in the glass in a state where the ion valence is +5, so in the pres...
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Abstract
The invention discloses a fluorophosphate glass, a glass preform, an optical element, and an optical instrument provided with the optical element. The fluorophosphate glass comprises cations and anions, and the cations comprise 25-40 mol% of P<5+>, 8-22 mol% of Al<3+>, 3-15 mol% of Sr<2+>, 1-10 mol% of Y<3+>, 1-10 mol% of Gd<3+> and 25-40 mol% of Ba<2+>, wherein a ratio of n(Sr<2+> + Y<3+>) / n(Al<3+> + Ba<2+>) is 0.25-0.43 (0.25 excluded). The fluorophosphate glass has a refractive index of 1.52-1.60 and an Abbe number of 68 or more, and has excellent optical properties and a low abrasion, so the machinability of the fluorophosphate glass is improved, and the needs of the market are met.
Description
technical field [0001] The invention belongs to the technical field of fluorophosphate glass, in particular, the invention relates to fluorophosphate glass, a glass preform, an optical element and an optical instrument having the same. Background technique [0002] Fluorophosphate optical glass is a special optical glass with low dispersion, which can eliminate secondary spectral chromatic aberration, improve the imaging quality of optical lenses, and has a low softening point, and can be made into aspheric lenses by one or two pressings , is an excellent optical material for the production of advanced digital products, so it has a high demand, especially low-dispersion colorless fluorophosphate optical glass with a refractive index nd between 1.52 and 1.60 and an Abbe number vd not less than 68. Some optical glasses have a high degree of abrasion, which makes their machinability difficult, which seriously affects the accuracy of the instrument. [0003] Therefore, it is ne...
Claims
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Login to View More IPC IPC(8): C03C3/247G02B1/00
CPCC03C3/247G02B1/00
Inventor 孙伟
Owner CDGM OPTICAL GLASS