Title:
光学ガラス、精密プレス成形用プリフォーム、及び光学素子
Document Type and Number:
Japanese Patent JP7409629
Kind Code:
B2
Abstract:
To provide optical glass having medium refractive index low dispersibility, excellent in fusion and capable of suppressing the temperature dependence of imaging when combined with the other glass.SOLUTION: The optical glass has a composition including, by mass%, 30-60% SiO2, 15% or less B2O3, 10% or less Li2O, 10% or less Na2O, 15% or less K2O, 7% or less Al2O3, 15% or less CaO, 12-40% BaO, 5% or less Nb2O5, 7% or less ZrO2, 5% or less TiO2, 5% or less Y2O3, 5% or less La2O3, without including ZnO and SrO. The tota content of Li2O, Na2O and K2O is 12-35%; the total content of CaO and BaO is 13-55%; and the temperature coefficient (40-60°C) of relative refractive index on a d-line is -5.0×10-6 to 3.0×10-6°C-1.SELECTED DRAWING: None
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Inventors:
Masaomi Fujino
Application Number:
JP2018247001A
Publication Date:
January 09, 2024
Filing Date:
December 28, 2018
Export Citation:
Assignee:
Sumita Optical Glass Co., Ltd.
International Classes:
C03C3/078; C03C3/062; C03C3/064; C03C3/068; C03C3/085; C03C3/087; C03C3/089; C03C3/091; C03C3/093; C03C3/095; C03C3/097; G02B1/00
Domestic Patent References:
| JP6107426A | ||||
| JP2008254975A |
Attorney, Agent or Firm:
Kenji Sugimura