Optical glass and optical element

An optical glass, content technology, applied in optical components, optics, instruments, etc., can solve the problems of low dispersion, small average linear thermal expansion coefficient, etc., and achieve the effect of large linear thermal expansion coefficient

Pending Publication Date: 2021-05-28
HOYA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The optical glass disclosed in Patent Document 2 has a high refractive index, but has low dispersion and a small average linear thermal expansion coefficient

Method used

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  • Optical glass and optical element
  • Optical glass and optical element
  • Optical glass and optical element

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Experimental program
Comparison scheme
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no. 1 Embodiment approach

[0067] The optical glass of the first embodiment will be described in detail.

[0068] The optical glass of the first embodiment has a refractive index nd of 1.63 to 1.80,

[0069] The Abbe number νd is 22-34,

[0070] Nb 2 o 5 The content is 25 to 55% by mass,

[0071] WO 3 The content is less than 30% by mass,

[0072] TiO 2 , Nb 2 o 5 、WO 3 、 Bi 2 o 3 and Ta 2 o 5 The total content of [TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 +Ta 2 o 5 ] is 36-60% by mass,

[0073] TiO 2 , Nb 2 o 5 、WO 3 、 Bi 2 o 3 and Ta 2 o 5 The total content relative to P 2 o 5 , B 2 o 3 , SiO 2 、Al 2 o 3 , Li 2 O, Na 2 O, K 2 O and Cs 2 The mass ratio of the total content of O [(TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 +Ta 2 o 5 ) / (P 2 o 5 +B 2 o 3 +SiO2 2 +Al 2 o 3 +Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.10 or less,

[0074] TiO 2 content relative to P 2 o 5 and B 2 o 3 The mass ratio of the total content of [TiO 2 / (P 2 o 5 +B 2 o 3 )] is less than 0.50,...

no. 2 Embodiment approach

[0245] The optical glass of the second embodiment will be described in detail.

[0246] P of the optical glass of the second embodiment 2 o 5 The content is 25 to 50% by mass,

[0247] TiO 2 The content is 10 to 50% by mass,

[0248] Nb 2 o 5 The content is 5 to 30% by mass,

[0249] TiO 2 , Nb 2 o 5 、WO 3 、 Bi 2 o 3 and Ta 2 o 5 The total content of [TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 +Ta 2 o 5 ] is 35 to 60% by mass,

[0250] TiO 2 content relative to TiO 2 , Nb 2 o 5 、WO 3 、 Bi 2 o 3 and Ta 2 o 5 The mass ratio of the total content of [TiO 2 / (TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 +Ta 2 o 5 )] is more than 0.25,

[0251] P 2 o 5 , B 2 o 3 and SiO 2 The total content relative to Li 2 O, Na 2 O, K 2 O and Cs 2 The mass ratio of the total content of O [(P 2 o 5 +B 2 o 3 +SiO2 2 ) / (Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.80 or less,

[0252] And meet the following (A) or (B):

[0253] (A) WO 3 The content is 7% by mass or less;

...

no. 3 Embodiment approach

[0376] The optical glass of the third embodiment will be described in detail.

[0377] P of the optical glass of the third embodiment 2 o 5 The content is 25-50%,

[0378] Nb 2 o 5 The content is 14-40%,

[0379] TiO 2 , Nb 2 o 5 、WO 3 、 Bi 2 o 3 and Ta 2 o 5 The total content of [TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 +Ta 2 o 5 ] is 35-60%,

[0380] TiO 2 content relative to TiO 2 , Nb 2 o 5 、WO 3 、 Bi 2 o 3 and Ta 2 o 5 The mass ratio of the total content of [TiO 2 / (TiO 2 +Nb 2 o 5 +WO 3 +Bi 2 o 3 +Ta 2 o 5 )] is more than 0.25,

[0381] B 2 o 3 content relative to P 2 o 5 The mass ratio of the content of [B 2 o 3 / P 2 o 5 ] is 0.05~0.39,

[0382] Li 2 O, Na 2 O, K 2 O and Cs 2 The total content of O [Li 2 O+Na 2 O+K 2 O+Cs 2 O] is 10% or more,

[0383] Na 2 O content relative to K 2 The mass ratio of O content [Na 2 O / K 2 O] is 1.50 or more.

[0384] In the optical glass of the third embodiment, P 2 o 5 The content i...

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Abstract

To provide an optical glass having a low temperature coefficient of the relative refractive index (dn/dT) thereof due to temperature change and a large average linear thermal expansion coefficient, and an optical element that comprises the optical glass. An optical glass having a refractive index nd of 1.63-1.80, an Abbe number vd of 22-34, a Nb2O5 content of 25-55 mass%, a WO3 content of less than 30 mass%, a total content [TiO2 + Nb2O5 + WO3 + Bi2O3 + Ta2O5] of TiO2, Nb2O5, WO3, Bi2O3, and Ta2O5 of 36-60 mass%, a mass ratio [(TiO2 + Nb2O5 + WO3 + Bi2O3 + Ta2O5)/(P2O5 + B2O3 + SiO2 + Al2O3 + Li2O + Na2P + K2O + Cs2O)] of the total content of TiO2, Nb2O5, WO3, Bi2O3, and Ta2O5 to the total content of P2O5, B2O3, SiO2, Al2O3, Li2O, Na2O, K2O, and Cs2O of 1.10 or less, and a mass ratio [TiO2/(P2O5 + B2O3)] of the content of TiO2 to the total content of P2O5 and B2O3 of 0.50 or less, and satisfying (A) or (B).

Description

technical field [0001] The invention relates to an optical glass and an optical element. Background technique [0002] Optical elements mounted on automotive optical devices and optical devices that generate heat such as projectors, copiers, laser printers, and broadcasting equipment are used in environments with large temperature changes. If the optical properties such as the refractive index fluctuate due to temperature changes, it will affect the imaging properties of the optical system and the like. [0003] Here, it is known that the influence of temperature change on the imaging characteristics of the optical system can be reduced by combining an optical element having a negative relative refractive index temperature coefficient (dn / dT) and an optical element having a positive value. [0004] The relative temperature coefficient of refractive index (dn / dT) represents the change in refractive index with respect to temperature change. For an optical element whose refra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/21C03C4/00G02B1/00
CPCC03C3/21C03C4/00G02B1/00C03C3/062C03C3/064C03C3/19
Inventor 桑谷俊伍
Owner HOYA CORP
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