MUMBAI, India, July 24 -- Intellectual Property India has published a patent application (202631079916 A) filed by Dr Babu S on June 29, 2026, for Method And Apparatus For Passive Solar Concentration And Transmission For Indoor Illumination.
Inventors include Dr Babu S; Ms. Shivani L; Dr. Karpagaraj A; and Dr. Pradeep Raja C.
The application for the patent was published on July 17, 2026, under issue no. 29/2026.
Abstract: The present invention relates to a system for passive daylight collection and indoor illumination, configured to minimize reliance on artificial lighting in buildings. The system comprises a dome-shaped optical concentrator capable of collecting sunlight from a wide range of incident angles, including low solar angles occurring during early morning and late afternoon' The dome-shaped design allows effective light collection without precise alignment or active solar tracking mechanisms, thereby providing a passive, wide- angle light concentration solution' The concentrator is fabricated using accessible manufacturing methods, including additive manufacturing (3D printing) and precision cutting techniques, ensuring accurate the foldable lens geometry while maintaining production feasibility. The collected sunlight is transmitted indoors via light-guiding channels or optical fibers, enabling efficient and uniform illumination of interior spaces. Simulation studies conducted using optical analysis software and experimental validation with controlled light sources demonstrated enhanced light concentration, improved focal quality, and uniform distribution compared to conventional flat lens designs. Parameters such as focal length, deflection angle, and optical transmittance were measured to validate system performance. The system exhibited effective indoor illumination even under non-optimal sunlight incidence, improving brightness, comfort, and energy efficiency without the need for electrical lighting. The invention provides a passive lighting solution with minimal maintenance requirements, suitable for residential, commercial, institutional, and public buildings. The system is compact, scalable, and capable of year-round operation under varying environmental conditions' By reducing dependency on artificial lighting, the invention supports energy conservation, lower carbon footprint, and sustainable building practices, integrating principles of optical engineering, materials science, and renewable energy' Figure I illustrates the experimental arrangement employed to evaluate the performance of the dome-shaped optical concentrator.
Disclaimer: Curated by HT Syndication.
