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Leveraging the strengths of VCSELs and LEDs, Rohm’s VCSELED infrared light source aims to advance automotive ADAS technologies. Currently under development for commercialization, VCSELED technology is expected to improve both in-vehicle and in-cabin monitoring systems, enable more precise sensing, and enhance driver safety.
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VCSELED encapsulates a vertical cavity surface emitting laser (VCSEL) element in a resin optical diffusion material for laser light. It extends the beam (irradiation) angle similar to LEDs, enabling sensing over a wider area with higher accuracy than VCSELs. The light emitting element and light diffuser are integrated into a compact package, contributing to smaller, thinner applications.
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The VCSEL element used in VCSELED features a narrow emission wavelength bandwidth of 4 nm, approximately one-seventh that of LEDs, according to Rohm. This characteristic improves resolution on the receiving side, while eliminating the red glow often associated with LEDs. Rohm also says a wavelength temperature variation of 0.072 nm/°C is less than one-fourth that of LEDs (0.3 nm/°C), allowing high-accuracy sensing unaffected by temperature changes. Further, VCSELED’s response time when emitting light is just 2 ns.
In addition to automotive monitoring systems, the VCSELED light source can improve the performance of inspection systems used in robotics and industrial equipment, as well as spatial recognition and ranging systems.
Prototype samples are currently available for purchase. Mass production samples are scheduled for commercial release in October 2024 and for automotive use in 2025.
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