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Preparation process of blue glass for infrared cut-off filter

A preparation process and infrared cut-off technology, used in glass manufacturing equipment, glass furnace equipment, manufacturing tools, etc., can solve problems such as the inability to meet the requirements of lenses with more than 8 million pixels, and achieve poor internal quality and improve light transmittance. , the effect of eliminating bubbles

Active Publication Date: 2015-03-04
无锡长三角光电新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the infrared cut-off filter composed of optical glass and coated with infrared cut-off film is only suitable for low-pixel cameras, and cannot meet the requirements of lenses with more than 8 million pixels.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Start the temperature control system of the clinker furnace, and raise the temperature in the furnace to 1350°C at a rate of 50-70°C / h.

[0033] Add 50Kg of blue glass raw material to the alumina crucible of the clinker furnace several times. While adding the blue glass raw material, use a quartz tube to feed oxygen into the clinker furnace, and control the gas flow rate to 20~30L / h.

[0034] After adding the glass raw materials, keep the temperature for 40 minutes to completely melt the blue glass raw materials, and then use a quartz tube to feed oxygen into the glass melt, and control the gas flow rate to 100~120L / h.

[0035] Adjust the temperature control system of the clinker furnace, reduce the temperature in the clinker furnace to 1150 °C at a rate of 5-7 °C / min, stop the ventilation after 2 hours of constant temperature, pour the melt into a water-cooled cast iron mold to cool naturally, and obtain Glass precursors.

[0036] Start the temperature control system ...

Embodiment 2

[0042] Start the temperature control system of the clinker furnace, and raise the temperature in the furnace to 1400°C at a rate of 60-80°C / h.

[0043] Add 50Kg of blue glass raw material to the alumina crucible of the clinker furnace several times. While adding the blue glass raw material, pass the mixed gas of nitrogen and oxygen (40% nitrogen + 60% oxygen) into the clinker furnace with a quartz tube. Control gas flow rate 30~40L / h.

[0044] After adding the glass raw materials, keep the temperature for 30 minutes to completely melt the blue glass raw materials, and then use a quartz tube to feed a mixture of nitrogen and oxygen (40% nitrogen + 60% oxygen) into the glass melt, and control the gas flow to 120~140L / h.

[0045] Adjust the temperature control system of the clinker furnace, reduce the temperature in the clinker furnace to 1200°C at a rate of 6~8°C / min, stop the ventilation after constant temperature for 1.5 hours, and pour the melt into a cast iron mold with wa...

Embodiment 3

[0052] Start the temperature control system of the clinker furnace, and raise the temperature in the furnace to 1450°C at a rate of 80~100°C / h.

[0053] Add 50Kg of blue glass raw material to the alumina crucible of the clinker furnace several times. While adding the blue glass raw material, use a quartz tube to feed the mixed gas of argon and oxygen into the clinker furnace (50% argon + 50% oxygen ), control the gas flow rate to 40~50L / h.

[0054] After adding the glass raw materials, keep the temperature for 20 minutes to completely melt the raw materials, and then use a quartz tube to feed a mixed gas of argon and oxygen (50% argon + 50% oxygen) into the glass melt, and control the gas flow to 130~150L / h.

[0055] Adjust the temperature control system of the clinker furnace to reduce the temperature in the clinker furnace to 1250°C at a rate of 8-10°C / min. After constant temperature for 1 hour, stop the ventilation, pour the melt into a water-cooled cast iron mold to cool...

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Abstract

The invention discloses a preparation process of blue glass for an infrared cut-off filter. The preparation process comprises the following steps of: heating up a clinker furnace; charging and ventilating to the clinker furnace; melting a glass raw material and ventilating; casting in the clinker furnace; heating up a primary furnace; charging and ventilating to the primary furnace; clarifying molten glass; stirring in the primary furnace; casting in the primary furnace; and annealing the molten glass. According to the preparation process, the molten glass is mixed uniformly and melted sufficiently by two-stage fusing in the clinker furnace and the primary furnace, long-time stirring and clarifying of the molten glass, and air bubbles dispersed in the molten glass are removed, so that obtained blue glass is good in internal uniformity and has no stripes and no air bubbles. According to the preparation process, protective gas is ventilated to the molten glass for adjusting the oxidation-reduction ratio of the glass components, improving the light transmittance of the blue glass in a visible light region, and reducing the light transmittance of the blue glass in the infrared cut-off region, so that obtained infrared cut-off filter has the light transmittance bigger than 87% in the visible light region, and the light transmittance smaller than 3% in the infrared cut-off region.

Description

technical field [0001] The invention relates to the field of glass preparation, and in particular discloses a preparation process of blue glass for infrared cut-off filters. Background technique [0002] When using a CCD or CMOS image sensor to shoot a color scene, because their reaction to color is different from that of the human eye, it is necessary to remove the infrared part that they can detect but cannot be detected by the human eye, and adjust the reaction to color in the visible light range. To make the color of the image conform to the feeling of the human eye, an infrared cut filter that only passes visible light is generally added in the middle of the OLPF chip. [0003] Infrared cut-off filter is an optical filter with high and low refractive index alternately coated on optical glass by using precision optical coating technology to achieve high transparency in the visible light region (400~630nm) and near-infrared (700~1100nm) cut-off optical filter. It is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B5/16
Inventor 柳祝平黄小卫
Owner 无锡长三角光电新材料有限公司
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