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US5036025A
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Infrared absorbing green glass
Assignee: Hoya Optics Inc
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Filing: 1990-10-02
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Granted: 1991-07-30
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Expires: 2010-10-02
Abstract
Abstract A green optical filter phosphate-based glass having a high near infrared, absorption at about 650 nm to 950 nm and a transmission peak transmission at 550 nm to 560 nm and with the steepest slope of the absorption curve occurring between about 570 nm to 650 nm. The glass composition comprising, in mol %: 50 to 60% P 2 O 5 , O to 5% SiO 2 , 20 to 33% Li 2 O, 0 to 25% Na 2 O, 1 to 25% K 2 O, 0 to 5% for each of CaO, Bao, SrO and MgO, 7 to 10% Al 2 O 3 , 3 to 6% CuO, 0.5 to 1.6% Cr 2 O 3 , 0.5 to 2.0% Ho 2 O 3 , 0.5 to 2.0 Dy 2 O 3 and 0 to 2.0% Er 2 O 3 .
Inventors
- 👤 Yeong Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:42
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/17; C03C4/00; C03C4/02; C03C4/08; C03C4/082; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A phosphate-based green filter glass with strong absorption in the spectral range of 650 nm to 950 nm, consisting essentially of the following ingredients, in mol %: (i) 50 to 60% P 2 O 5 (ii) 0 to 5% SiO 2 (iii) 20 to 33% Li 2 O, 0 to 25% Na 2 O, 1 to 25% K 2 O (iv) 0 to 5% MgO, 0 to 5% CaO, 0 to 5% BaO, 0 to 5% SrO (v) 7 to 10% Al 2 O 3 (vi) 3 to 6% CuO (vii) 0.5 to 1.6% Cr 2 O 3 (viii) 0.5 to 2.0% Ho 2 O 3 (ix) 0.5 to 2.0% Dy 2 O 3 (x) 0 to 2.0% Er 2 O 3 .
Claim 2
Dependent Claim
123 words
A phosphate-based green filter glass with strong absorption in the spectral range of 650 nm to 950 nm, consisting essentially of the following ingredients, in mol %: (i) 50 to 60% P 2 O 5 (ii) 0 to 5% SiO 2 (iii) 20 to 33% Li 2 O, 0 to 25% Na 2 O, 1 to 25% K 2 O (iv) 0 to 5% MgO, 0 to 5% CaO, 0 to 5% BaO, 0 to 5% SrO (v) 7 to 10% Al 2 O 3 (vi) 3 to 6% CuO (vii) 0.5 to 1.6% Cr 2 O 3 (viii) 0.5 to 2.0% Ho 2 O 3 (ix) 0.5 to 2.0% Dy 2 O 3 (x) 0 to 2.0% Er 2 O 3 .
Claim 3
Dependent Claim
23 words
The phosphate-based filter glass composition as in claim 1, wherein the total mol % of monovalent oxides is 20 to 33 mol %.
Claim 4
Dependent Claim
28 words
The phosphate-based filter glass composition as in claim 1, wherein the ratio of Cr 2 O 3 mol % to CuO mol % is between 0.25 to 0.80.
Claim 5
Dependent Claim
53 words
A green filter glass consisting essentially of the following ingredients, in mol %: 57.0% P 2 O 5 , 24.9% Li 2 O, 1.6% K 2 O, 7.7% AL 2 O 3 , 5.1% CuO, 1.6% Cr 2 O 3 , 1.0% Ho 2 O 3 , 1.1% Dy 2 O 3 .
Claim 6
Dependent Claim
53 words
A green filter glass consisting essentially of the following ingredients, in mol %: 57.0% P 2 O 5 , 24.9% Li 2 O, 1.6% K 2 O, 7.7% AL 2 O 3 , 5.1% CuO, 1.6% Cr 2 O 3 , 1.0% Ho 2 O 3 , 1.1% Dy 2 O 3 .
Claim 7
Dependent Claim
57 words
A green filter glass consisting essentially of the following ingredients, in mol %: 54.2% P 2 O 5 , 4.9% SiO 2 , 22.3% Li 2 O, 1.6% K 2 O, 8.2% Al 2 O 3 , 5.1% CuO, 1.6% Cr 2 O 3 , 1% Ho 2 O 3 , 1.1% Dy 2 O 3 .
Claim 8
Dependent Claim
57 words
A green filter glass consisting essentially of the following ingredients, in mol %: 54.2% P 2 O 5 , 4.9% SiO 2 , 22.3% Li 2 O, 1.6% K 2 O, 8.2% Al 2 O 3 , 5.1% CuO, 1.6% Cr 2 O 3 , 1% Ho 2 O 3 , 1.1% Dy 2 O 3 .
Claim 9
Dependent Claim
51 words
A green filter glass consisting essentially of the following ingredients, in mol %: 54.2% P 2 O 5 , 4.9% SiO 2 , 22.3% Li 2 O, 1.6% K 2 O, 8.2% Al 2 O 3 , 5.1% CuO, 1.6% Cr 2 O 3 , 2.1% Ho 2 O 3 .
Claim 10
Dependent Claim
51 words
A green filter glass consisting essentially of the following ingredients, in mol %: 54.2% P 2 O 5 , 4.9% SiO 2 , 22.3% Li 2 O, 1.6% K 2 O, 8.2% Al 2 O 3 , 5.1% CuO, 1.6% Cr 2 O 3 , 2.1% Ho 2 O 3 .
Claim 11
Dependent Claim
38 words
A phosphate-based green filter glass as in claim 1, wherein said glass has a transmission peak at 550 nm to 560 nm and with the steepest slope of the absorption curve occurring between 570 nm and 650 nm.
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