Claims
- 1. An optical glass having an index of refraction n.sub.e between 1.7784 and 1.8753 and an Abbe number .nu..sub.e between 25.8 and 30.8, said glass consisting essentially of:
- between about 5 and 9.9%, by weight, of silicon dioxide SiO.sub.2 ;
- between about 30 and 50%, by weight, of barium oxide BaO;
- between about 18 and 24%, by weight, of aluminum oxide Al.sub.2 O.sub.3 ; and
- between about 21 and 30%, by weight, of titanium dioxide TiO.sub.2.
- 2. The optical glass composition as defined by claim 1, wherein the barium oxide is replaced partially by an amount of one of the oxides selected from the group of oxides consisting of sodium oxide Na.sub.2 O, beryllium oxide BeO, calcium oxide CaO, strontium oxide SrO, gadolinium oxide Ga.sub.2 O.sub.3, indium oxide In.sub.2 O.sub.3, and yttrium oxide Y.sub.2 O.sub.3, whereby the amount of the oxide added to partly replace barium oxide is as follows:
- up to 10%, by weight, of sodium oxide,
- up to 2%, by weight, of berillium oxide,
- up to 8%, by weight, of calcium oxide,
- up to 16%, by weight, of strontium oxide,
- up to 8%, by weight, of cadmium oxide,
- up to 4%, by weight, of gadolinium oxide,
- up to 8%, by weight, of indium oxide, and
- up to 10%, by weight, of yttrium oxide.
- 3. The optical glass composition as defined by claim 1, wherein the silicon dioxide is replaced partially by an amount of one of the oxides selected from the group of oxides consisting of boron trioxide B.sub.2 O.sub.3, lead monoxide PbO, germanium dioxide GeO.sub.2, stannic oxide SnO.sub.2, zirconium oxide ZrO.sub.2, hafnium oxide HfO.sub.2, and thorium oxide ThO.sub.2, whereby the amount of the oxide added to partly replace silicon dioxide is as follows:
- up to 2%, by weight, of boron trioxide,
- up to 2%, by weight, of lead monoxide,
- up to 6%, by weight, of germanium dioxide,
- up to 4%, by weight, of stannic oxide,
- up to 2%, by weight, of zirconium oxide,
- up to 2%, by weight, of hafnium oxide, and
- up to 2%, by weight, of thorium oxide.
- 4. The optical glass composition as defined by claim 1, wherein said glass composition consists of:
- between about 7% and 9.9%, by weight, of silicon dioxide SiO.sub.2 ;
- between about 44% and 50%, by weight, of barium oxide BaO;
- between about 18% and 24%, by weight, of aluminum oxide Al.sub.2 O.sub.3 ; and
- between about 21% and 30%, by weight, of titanium dioxide TiO.sub.2.
- 5. The optical glass composition as defined by claim 1, consisting essentially of:
- 7%, by weight, of silicon dioxide SiO.sub.2 ;
- 48%, by weight, of barium oxide BaO;
- 24%, by weight, of aluminum oxide Al.sub.2 O.sub.3 ; and
- 21%, by weight, of titanium dioxide TiO.sub.2.
- 6. The optical glass composition as defined by claim 1, consisting essentially of:
- 7%, by weight, of silicon dioxide SiO.sub.2 ;
- 44%, by weight, of barium oxide BaO;
- 19%, by weight, of aluminum oxide Al.sub.2 O.sub.3 ; and
- 30%, by weight, of titanium dioxide TiO.sub.2.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 2161701 |
Dec 1971 |
DT |
|
Parent Case Info
This is a continuation of application Ser. No. 308,696 filed Nov. 22, 1972, now abandoned.
US Referenced Citations (9)
Continuations (1)
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Number |
Date |
Country |
| Parent |
308696 |
Nov 1972 |
|
Patent Grant
3960579
