Robertus A Keijser is a notable inventor based in Eindhoven, Netherlands. He has made significant contributions to the field of high-pressure discharge lamps, holding a total of 7 patents. His work has advanced the technology used in lighting systems, showcasing his expertise and innovative spirit.

Latest Patents

Keijser's latest patents include a high-pressure discharge lamp with a miniature discharge vessel. This invention features a discharge vessel filled with inert gas and metal, which is ignited and operated by an electronic circuit. The circuit includes a half bridge converter with an LC circuit that enters an oscillation state near a resonance frequency when the lamp is not ignited. This frequency lies near the third harmonic of the switching frequency of the half bridge converter. Another significant patent involves a switching arrangement for the operation of a high-pressure sodium discharge lamp, which utilizes an adjustable power controlled by a signal generated from optical sensing means. This system registers the spectral power of light emitted by the lamp within a wavelength range of 350 nm to 800 nm.

Career Highlights

Robertus A Keijser is associated with U.S. Philips Corporation, where he has contributed to various innovative projects. His work has been instrumental in enhancing the efficiency and functionality of lighting technologies.

Collaborations

Keijser has collaborated with notable coworkers, including Monique M Eerdekens and Bram Johan Derksema. Their combined efforts have led to advancements in the field of lighting technology.

Conclusion

Robertus A Keijser's contributions to the field of high-pressure discharge lamps demonstrate his innovative capabilities and commitment to advancing lighting technology. His patents reflect a deep understanding of electronic circuits and optical sensing, positioning him as a key figure in the industry.

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