ROHM Develops a Novel VCSELED™ Infrared Light Source that Combines Features of VCSELs and LEDs
ROHM has established VCSELED™, a new Infrared Light Source technology that encapsulates a VCSEL (Vertical Cavity Surface Emitting Laser) element in a resin optical diffusion material for laser light. ROHM is currently developing this technology for commercialization as a light source for improving vehicle Driver Monitoring Systems (DMS) and In-Cabin Monitoring Systems (IMS).
To further enhance automotive safety, driver monitoring systems are increasingly being installed in vehicles equipped with Advanced Driver Assistance Systems (ADAS) to detect drowsiness, sleepiness, and distracted driving. In Japan, the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT) has created guidelines that define the design and functions of the system, and in the EU, there are plans to make installation mandatory in all new vehicles sold in Europe from July 2024 onwards. Automakers and suppliers are also developing in-vehicle monitoring systems to detect occupants other than the driver, and there is a growing awareness of the need for high-performance light sources that enable detection systems to function with greater precision.
In response, ROHM has developed VCSELED™ that achieves high-accuracy sensing. Minimal wavelength temperature variation combined with a wide emission beam angle make it ideal not only for in-vehicle monitoring systems, but also contribute to improving the accuracy and performance of inspection systems for robots and industrial equipment as well as spatial recognition and ranging systems.
VCSELED™ extends the beam (irradiation) angle similar to LEDs by combining a high-performance VCSEL element and light diffusion material to enable sensing over a wider area with higher accuracy than VCSELs. What’s more, the light emitting element and light diffuser are integrated into a compact package, contributing to smaller, thinner applications.
The VCSEL element used in VCSELED™ features a narrow emission wavelength bandwidth of 4nm, approximately one-seventh that of LEDs. This characteristic improves resolution performance on the receiving side while eliminating the red glow often associated with LEDs. At the same time, a wavelength temperature variation of 0.072nm/℃ - less than one-fourth that of LEDs (0.3nm/℃) - allows for high-accuracy sensing unaffected by temperature changes. Furthermore, the response time when emitting light is 2ns, approx. 7.5 times faster than LEDs, contributing to higher performance in ToF (Time of Flight) applications that use infrared light to measure distance.
ROHM is working on commercializing VCSELED™ as a new technology brand for infrared light source components. Prototype samples is available for purchase now, with mass production samples for consumer scheduled for release in October 2024 and automotive use in 2025, respectively. To obtain samples, please contact a sales representative or visit the contact page on ROHM’s website. Going forward, we will continue to develop laser light source technology for in-vehicle monitoring and other systems.
Terminology
VCSEL
Short for Vertical Cavity Surface Emitting Laser. Although conventionally used for communication, it is increasingly being adopted in recent years as a light source for the optical block in sensing systems.
DMS
Stands for Driver Monitoring System. A safe driving assistance function that detects whether the driver can continue safe driving based on facial and eye movements and provides alerts via sounds and/or text to prevent accidents before they occur.
IMS (ICMS)
Abbreviation for In-Cabin Monitoring System. This system expands the detection range to include front and rear passenger seats, occupant recognition, and biometric sensing to improve safety and comfort.
Red Glow
When high power infrared LEDs are used in sensors and other devices, there is a possibility that wavelengths close to those of visible light will be emitted that can be detected by the human eye. In this case, the sensor appears slightly red, hence the term “red glow”.
- +1 Like
- Add to Favorites
Recommend
- Silicon Carbide cooperation between SEMIKRON and ROHM Semiconductor: ROHM’s SiC technology empowers SEMIKRON’s eMPack® for the next generation of electric vehicles
- Notice of Integration of ROHM Three Sales Companies in China
- New VCSEL Module Technology: Increasing the Output of Spatial Recognition and Ranging Systems by 30% | ROHM
- Continental acknowledges ROHM Semiconductor with the “Supplier of the Year 2022 Award“
- ROHM New Compact VCSEL Proximity Sensor Contributes to Greater Miniaturization and Battery Capacity in Wireless Earbuds and Wearable Devices
- ROHM Online Distributor China | Sekorm
- ROHM‘s Nano Energy™ and LAPIS Technology‘s Charge Control IC Help Maxell Energy Harvesting-compatible Evaluation Kit
- Ultra-Low IQ PMIC from ROHM Selected to Power NXP iMX8M Nano for High Performance Embedded Artists Industrial Control Board
This document is provided by Sekorm Platform for VIP exclusive service. The copyright is owned by Sekorm. Without authorization, any medias, websites or individual are not allowed to reprint. When authorizing the reprint, the link of www.sekorm.com must be indicated.
Integrated Circuits
Discrete Components
Connectors & Structural Components
Assembly UnitModules & Accessories
Power Supplies & Power Modules
Electronic Materials
Instrumentation & Test Kit
Electrical Tools & Materials
Mechatronics
Processing & Customization
