Ultraviolet bandpass filter, substrate: Hisashi Seiko Glass "IHU150"

"Extract only the desired light" — this is the role of optical components known as band-pass filters (BPF). We will explain the mechanism and selection of BPFs, which are used in various fields such as medical, industrial, and environmental measurement, in an easy-to-understand manner, even without specialized knowledge. Camera sensors, medical fluorescence microscopes, factory appearance inspection devices, environmental measurement sensors — these seemingly completely different devices share a common technical challenge: "accurately extracting only the necessary wavelengths from light that contains countless wavelengths." For example, in fluorescence imaging, it is essential to detect only the weak fluorescence signals amidst strong excitation light. In factory appearance inspection, it is necessary to shut out stray light from daylight and fluorescent lamps to detect only the illumination wavelengths. The optical component responsible for this "light selection" is the band-pass filter (BPF). The name may sound complicated, but once you understand its mechanism, it is based on a very simple principle. We will present the basic concepts of BPFs, manufacturing principles, and points for application selection in a format that can be read in five minutes. Please check our company website for more information.

The way of presenting in the entertainment sector is changing significantly due to the expansion of expos, immersive exhibitions, and experiential museums. Traditionally, the focus was on enhancing visual and lighting effects, but now the competition lies in "experience design," which revolves around "how visitors feel and how they remember" their experiences. With the proliferation of social media, there is a demand not only for "instant impact" but also for "shareable experiences" and "experiences that make people want to return." In this context, the key to differentiation is the "quality of light." An important role in this is played by optical thin-film technology, which precisely controls the wavelength of light. Optical thin films enable visual experiences that cannot be achieved with conventional lighting or displays by designing transmission, reflection, and absorption at the nanoscale. In the future of entertainment, light is evolving from a mere means of presentation to a design element that constitutes the experience itself. 【1】Exhibitions that change depending on the viewer 【2】Productions with two worlds 【3】Designing the space itself 【4】Next-generation exhibitions that integrate with sensors 【5】Potential applications in the entertainment sector Summary: The option of co-creation For more details, please refer to our company website.

In recent years, technological innovations in the agricultural sector have significantly shifted from traditional biological approaches such as soil improvement and breeding to an engineering concept of "designing the environment itself." Particularly noteworthy is smart agriculture, which integrates precise control of light environments with sensing technology. Plant growth is complexly determined not only by light intensity but also by wavelength distribution, angle of incidence, temporal variations, and interactions with surrounding temperatures. In other words, agriculture can essentially be described as "the science of spectral control." In this context, optical thin films and optical filters play an extremely important role. Optical thin films are functional materials that allow for precise design of reflectivity, transmittance, absorbance, and interference characteristics through control of film thickness on the nanometer scale. By using multilayer interference structures, it is possible to selectively transmit and reflect specific wavelengths, which directly contributes to optimizing effective light for photosynthesis in plants and controlling unwanted infrared and ultraviolet light. For more information, please check our company website.

Optical thin-film filters are important optical components designed to transmit and reflect light at specific wavelengths. Optical filters have the troublesome characteristic of "angle dependence," where the transmission and reflection properties change depending on the observation angle and the angle of incidence. This property can be both an advantage and a challenge depending on the usage conditions of the filter. In this article, we will explain in detail the reasons for the angle dependence of optical thin-film filters and its effects, as well as practical considerations and countermeasures. 1. Basics of optical thin-film filters and angle dependence 2. What is angle dependence? 3. Effects of angle dependence and application examples 4. Countermeasures and design considerations for angle dependence A message to designers - from a film manufacturing company For more details, please visit our website.