Douglas Gordon Crawford

Title: Douglas Gordon Crawford: Innovator in High-Intensity Discharge Lamps

Introduction

Douglas Gordon Crawford is a notable inventor based in Orinda, CA (US). He has made significant contributions to the field of lighting technology, particularly in the development of high-intensity discharge lamps. With a total of 2 patents, Crawford's work focuses on innovative solutions that enhance the efficiency and effectiveness of lighting systems.

Latest Patents

Crawford's latest patents include the "RF driven sulfur lamp having driving electrodes which face each other" and the "RF driven sulfur lamp having driving electrodes arranged to cool the lamp." Both patents describe a high-intensity discharge lamp that operates without mercury, radiating a spectrum that is predominantly in the visible range. The lamps utilize a signal source to generate an excitation signal that is coupled to the exterior surface of the lamp's envelope, exciting the sulfur-containing substance inside. Various embodiments of the lamp feature electrodes shaped to complement the envelope's exterior, with designs that include spherical and cylindrical shapes. To minimize filamentary discharges, the envelope may include an elongated stem that allows for rotation. Additionally, the envelope can have a Dewar configuration with electrodes positioned strategically to optimize performance. The patents also discuss the use of an inert gas backfill to assist in excitation, with specific pressure requirements that influence the lamp's output and emitted spectrum.

Career Highlights

Crawford has worked with prestigious institutions, including the University of California, where he has contributed to research and development in lighting technologies. His innovative approach and technical expertise have positioned him as a key figure in the advancement of high-intensity discharge lamps.

Collaborations

Crawford has collaborated with notable individuals in his field, including George Gabor and Charles Maurice Greene. These partnerships have fostered a creative environment that has led to groundbreaking advancements in lighting technology.

Conclusion

Douglas Gordon Crawford's contributions to the field of high-intensity discharge lamps demonstrate his commitment to innovation and excellence. His patents reflect a deep understanding of lighting technology and a desire to create more efficient and effective solutions.