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UV transmission filter

A filter and ultraviolet technology, applied in the direction of filters, etc., can solve the problems of increasing glass and reducing ultraviolet transmittance, and achieve the effect of high ultraviolet transmittance

Inactive Publication Date: 2018-01-09
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the content of FeO in the glass is increased, the transmittance from visible light to infrared rays can be reduced, but the transmittance of ultraviolet rays that should be transmitted is also reduced accordingly.

Method used

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Examples

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Embodiment

[0123] Hereinafter, the present invention will be described based on examples. Example 1-1 to Example 4-4, Example 13-1 to Example 13-6, Example 14-1 to Example 14-6 are embodiments of the present invention, Example 5 to Example 12, Example 15-1 to Example 15- 6 is a comparative example. The samples used in each example were produced as follows.

[0124] First, glass raw materials were prepared so as to have the glass composition described in Table 1, and the glass raw material preparation was melted, stirred, and melted in an electric furnace using molybdenum silicide as a heating element at a temperature of 700 to 950° C. for 5 hours using a platinum crucible. clarify. In addition, Table 2 shows the cation composition and anion composition of glasses A-D. This melt was cast-molded in a cast iron mold, and slowly cooled to obtain an 800-g glass sample (glass block). Moreover, slicing, grinding, etc. were performed on this glass block, and the glass substrate of predetermi...

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Abstract

The present invention provides an UV transmission filter that reliably shields visible light and infrared light and achieves high ultraviolet light transmittance. The UV transmission filter includes abase made of glass and an optical multilayer film on the main surface of the base. The glass contains component of P, Al, R (Wherein R represents one or more of Li, Na, and K), R '(wherein R' represents one or more of Mg, Ca, Sr, Ba, and Zn), and Cu. The optical multilayer film has optical characteristics of an average transmittance of 5% or less at a wavelength of 420 nm to 680 nm when light isperpendicularly incident thereon.

Description

technical field [0001] The present invention relates to an ultraviolet transmission filter having high ultraviolet transmittance and low visible light and infrared transmittance. Background technique [0002] Conventionally, low-pressure mercury lamps and high-pressure mercury lamps are known as light sources of ultraviolet rays. In recent years, small and low-cost ultraviolet LEDs (ultraviolet light-emitting diodes) have become popular, and their use in various applications such as water disinfection equipment, ultraviolet curing resin curing equipment, and ultraviolet sensors is increasing. [0003] Such a light source for ultraviolet rays uses an ultraviolet transmission filter that blocks unnecessary visible light and infrared rays and selectively transmits only ultraviolet rays. [0004] As such an ultraviolet transmission filter, it has been proposed to include a predetermined amount of CoO, NiO, and TiO in a base glass transparent to ultraviolet rays. 2 UV-transmitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20
Inventor 吉原明彦
Owner ASAHI GLASS CO LTD
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