Material of gradient refrative index lens and its preparation method

Abstract

A material for the lens with gradient refractivity is prepared from thallium oxide 30-45 wt%, sodium (or potassium) oxide 5-12%, zinc oxide 6-12%, SiO2 34-50%, calcium oxide 0-5%, Al2O3 1-6%, zirconium oxide 0-2%, La2O5 0-5% and B2O3 0-10% through compounding, smelting, drawing into filament, ion exchange, surface treating and examining. Its advantages are less color difference, less volatilization in smelting, high Abbe number and high consistence.

Description

technical field

[0001] The invention belongs to the technical field of optical materials, and in particular relates to a material for a gradient refractive index lens and a preparation method thereof. Background technique

[0002] At present, the existing domestic optical glass materials have large chromatic aberration, small Abbe number, and large volatilization during smelting, resulting in many stripes and low consistency of optical glass materials. The lens made of existing optical glass materials has low product yield. .

[0003] The GRIN microlens with a numerical aperture of 0.60 produced by Nippon Plate Glass Co., Ltd. is an optical glass material whose main components are thallium oxide, boron oxide, sodium oxide, and silicon dioxide. The content of thallium oxide is 10%, and two oxides The boron content is 20%, the sodium oxide content is 10%, and the silicon dioxide content is 60%. The main disadvantage of this kind of optical glass is poor stability, small Abbe...

Examples

Embodiment 1

[0045] Taking the production of 100kg of the product of the present invention as an example, the raw materials used and the proportioning thereof are:

[0046] Thallium oxide 38kg

[0047] Sodium oxide 7kg

[0048] Zinc oxide 9kg

[0049] Silica 38kg

[0050] Calcium Oxide 2kg

[0051] Aluminum oxide 2kg

[0052] Zirconia 1kg

[0053] Lanthanum pentoxide 1kg

[0054] Boron trioxide 2kg

[0055] Its preparation method is as follows:

[0056] (1) Ingredients

[0057] Raw materials are weighed according to the proportioning ratio of the present invention.

[0058] (2) Melting

[0059] Mix the weighed raw materials, put the mixture into an opaque quartz crucible for the first smelting, heat it until it melts, and pour it into a platinum crucible for clarification after becoming a glass liquid, then heat it to 1420°C for the second smelting. Stir with a mixer at a high speed of 65 rpm, smelt for 5 hours, stop stirring for 2 hours, let the small bubbles escape, then stir ...

Embodiment 2

[0069] Taking the production of 100kg of the product of the present invention as an example, the raw materials used and the proportioning thereof are:

[0070] Thallium oxide 40kg

[0071] Sodium oxide 5kg

[0072] Zinc oxide 9kg

[0073] Silica 37kg

[0074] Calcium Oxide 3kg

[0075] Aluminum oxide 1kg

[0076] Zirconia 0kg

[0077] Lanthanum pentoxide 0kg

[0078] Boron trioxide 5kg

[0079] Its preparation method is as follows:

[0080] During the smelting process, the mixture is added to an opaque quartz crucible for the first smelting, heated until it melts, and then poured into a platinum crucible for clarification to carry out the second smelting, heated to 1380°C, using a mixer to Stir at a high speed of 60 rpm, melt for 6 hours, stop stirring for 2 hours, let the small bubbles escape, then stir with a mixer for 6 hours, start to cool down, and then stir with a mixer at a low speed of 50 rpm. The ion exchange process was carried out with potassium nitrate at ...

Embodiment 3

[0082] Taking the production of 100kg of the product of the present invention as an example, the raw materials used and the proportioning thereof are:

[0083] Thallium oxide 30kg

[0084] Sodium oxide 5kg

[0085] Zinc oxide 9kg

[0086] Silica 50kg

[0087] Calcium Oxide 5kg

[0088] Aluminum oxide 1kg

[0089] Zirconia 0kg

[0090] Lanthanum pentoxide 0kg

[0091] Diboron trioxide 0kg

[0092] Its preparation method is as follows:

[0093] During the smelting process, the mixture is added to an opaque quartz crucible for the first smelting, heated until it melts, and then poured into a platinum crucible for clarification to carry out the second smelting, heated to 1450°C, using a mixer to Stir at a high speed of 70 rpm, smelt for 4 hours, stop stirring for 2 hours, let the small bubbles escape, then stir with a mixer for 4 hours, start to cool down, and then stir with a mixer at a low speed of 10 rpm. The ion exchange process was carried out with potassium nitrate ...

technical field

[0001] The invention belongs to the technical field of optical materials, and in particular relates to a material for a gradient refractive index lens and a preparation method thereof. Background technique

[0002] At present, the existing domestic optical glass materials have large chromatic aberration, small Abbe number, and large volatilization during smelting, resulting in many stripes and low consistency of optical glass materials. The lens made of existing optical glass materials has low product yield. .

[0003] The GRIN microlens with a numerical aperture of 0.60 produced by Nippon Plate Glass Co., Ltd. is an optical glass material whose main components are thallium oxide, boron oxide, sodium oxide, and silicon dioxide. The content of thallium oxide is 10%, and two oxides The boron content is 20%, the sodium oxide content is 10%, and the silicon dioxide content is 60%. The main disadvantage of this kind of optical glass is poor stability, small Abbe...

Examples

Embodiment 1

[0045] Taking the production of 100kg of the product of the present invention as an example, the raw materials used and the proportioning thereof are:

[0046] Thallium oxide 38kg

[0047] Sodium oxide 7kg

[0048] Zinc oxide 9kg

[0049] Silica 38kg

[0050] Calcium Oxide 2kg

[0051] Aluminum oxide 2kg

[0052] Zirconia 1kg

[0053] Lanthanum pentoxide 1kg

[0054] Boron trioxide 2kg

[0055] Its preparation method is as follows:

[0056] (1) Ingredients

[0057] Raw materials are weighed according to the proportioning ratio of the present invention.

[0058] (2) Melting

[0059] Mix the weighed raw materials, put the mixture into an opaque quartz crucible for the first smelting, heat it until it melts, and pour it into a platinum crucible for clarification after becoming a glass liquid, then heat it to 1420°C for the second smelting. Stir with a mixer at a high speed of 65 rpm, smelt for 5 hours, stop stirring for 2 hours, let the small bubbles escape, then stir ...

Embodiment 2

[0069] Taking the production of 100kg of the product of the present invention as an example, the raw materials used and the proportioning thereof are:

[0070] Thallium oxide 40kg

[0071] Sodium oxide 5kg

[0072] Zinc oxide 9kg

[0073] Silica 37kg

[0074] Calcium Oxide 3kg

[0075] Aluminum oxide 1kg

[0076] Zirconia 0kg

[0077] Lanthanum pentoxide 0kg

[0078] Boron trioxide 5kg

[0079] Its preparation method is as follows:

[0080] During the smelting process, the mixture is added to an opaque quartz crucible for the first smelting, heated until it melts, and then poured into a platinum crucible for clarification to carry out the second smelting, heated to 1380°C, using a mixer to Stir at a high speed of 60 rpm, melt for 6 hours, stop stirring for 2 hours, let the small bubbles escape, then stir with a mixer for 6 hours, start to cool down, and then stir with a mixer at a low speed of 50 rpm. The ion exchange process was carried out with potassium nitrate at ...

Embodiment 3

[0082] Taking the production of 100kg of the product of the present invention as an example, the raw materials used and the proportioning thereof are:

[0083] Thallium oxide 30kg

[0084] Sodium oxide 5kg

[0085] Zinc oxide 9kg

[0086] Silica 50kg

[0087] Calcium Oxide 5kg

[0088] Aluminum oxide 1kg

[0089] Zirconia 0kg

[0090] Lanthanum pentoxide 0kg

[0091] Diboron trioxide 0kg

[0092] Its preparation method is as follows:

[0093] During the smelting process, the mixture is added to an opaque quartz crucible for the first smelting, heated until it melts, and then poured into a platinum crucible for clarification to carry out the second smelting, heated to 1450°C, using a mixer to Stir at a high speed of 70 rpm, smelt for 4 hours, stop stirring for 2 hours, let the small bubbles escape, then stir with a mixer for 4 hours, start to cool down, and then stir with a mixer at a low speed of 10 rpm. The ion exchange process was carried out with potassium nitrate ...