Infrared transmitting glass
A technology of infrared transmission and glass, applied in the direction of instruments, optical components, optics, etc., can solve problems such as degradation, unclear NIR images, visible light damage of sensors, etc., and achieve the effect of stable work
Active Publication Date: 2020-05-12
ASAHI GLASS CO LTD
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Problems solved by technology
[0004] With the expansion of this kind of use, the use in outdoor environments is also increasing. At this time, there are problems such as damage to the sensor by visible light due to sunlight, or blurring of the NIR image of the near-infrared camera due to stray light, etc.
[0007] However, these infrared transmission filters are obtained by providing an infrared transmission film made of resin, but such an infrared transmission film is not strong enough to be directly exposed to the external environment, even if it is provided on the outer surface of the cover glass of the infrared sensor or the like. , the deterioration over time is also remarkable, and the use is limited
Method used
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Embodiment 1
[0101] (Examples 1 to 14, Comparative Example 1)
[0102] Plate-shaped glass was produced by the following procedure so that each glass composition represented by the oxide-based mole percentage (mol%) shown in Tables 1-2 was obtained using a platinum crucible.
[0103] First, generally used glass raw materials such as oxides, hydroxides, carbonates, and nitrates are appropriately selected, and 1000 g is weighed as glass. Next, the mixed raw materials were put into a platinum crucible, put into a resistance heating electric furnace at 1500°C to 1700°C, and melted for about 3 hours to perform defoaming and homogenization. The obtained molten glass was poured into a mold material, held at a glass transition temperature + 50° C. for 1 hour, and then cooled to room temperature at a rate of 0.5° C. / minute to obtain a glass block. The obtained glass block was cut and ground, and finally the surface was processed into a mirror surface to obtain a glass plate with a square of 4 cm an...
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Provided is a cover glass for an infrared sensor, which, without using a toxic compound, maintains low transmittance in the visible region while sufficiently increasing the transmittance in a predetermined infrared region, and stably operates. This infrared transmitting glass contains 60 mol% or more of SiO2 in terms of mol% based on oxide, and a transmittance adjusting component composed of onlyan oxide, wherein the minimum transmittance value Tmin of the infrared transmitting glass at a wavelength of 900-1000 nm is 70% or more, and the difference (Tmax-Tmin) between the maximum transmittance value Tmax and the minimum transmittance value Tmin is 10% or less, and the maximum transmittance value Tvmax of the infrared transmitting glass at a wavelength of 380-650 nm is 50% or less.
Description
technical field [0001] The present invention relates to an infrared-transmitting glass, particularly an infrared-transmitting glass having a dark color tone, which has a high transmittance in a predetermined near-infrared region and suppresses the transmittance in a visible region. Background technique [0002] An infrared sensor is a device that receives light in the infrared region (infrared rays) and converts it into an electrical signal, and its use has been expanding in recent years. In particular, near-infrared rays (NIR) have been used for infrared communication such as remote controls, human body sensors such as opening and closing of automatic doors, and automatic lighting of lighting. It is installed in various applications such as applications such as robots and unmanned aircraft. [0003] That is, as an in-vehicle application, it can be used for distance measurement between the vehicle and external obstacles, detection of the presence or absence of passengers in...
Claims
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Login to View More IPC IPC(8): C03C4/10C03C3/085G02B5/22
CPCC03C3/085C03C4/10G02B5/22
Inventor 染谷武纪西沢学山本宏行小池章夫
Owner ASAHI GLASS CO LTD