Yifeng Cui

Title: Yifeng Cui: Innovator in Semiconductor Technology

Introduction

Yifeng Cui is a prominent inventor based in Fremont, CA, known for his contributions to semiconductor technology. With a total of 2 patents, he has made significant advancements in the field, particularly in defect inspection and optical encoders.

Latest Patents

One of Yifeng Cui's latest patents is focused on large-particle monitoring with laser power control for defect inspection. This innovation involves inspecting a semiconductor wafer using a main laser beam and a secondary laser beam. The secondary laser beam, which leads the main laser beam, operates at a lower power. This method allows for the detection of particles on the semiconductor wafer that meet a specific size threshold. Upon detecting a particle, both the main and secondary laser beams' power is reduced, allowing the particle to pass through the main laser beam safely. After the particle has passed, the power levels are restored in a controlled manner.

Another notable patent is the optical rotary position encoder. This invention addresses the limitations in size reduction for optical encoders by removing discrete components from the laser diode cover package and mounting smaller components on a base framework. The design includes an altered photodetector/amplifier geometry, which shortens the leads between them. This results in a significant size reduction of the encoder, a decrease in required gain, and an increase in bandwidth. The entire framework is temperature-cooled using thermo-electric coolers, which stabilize the outputs of both the laser diode and the photodetector.

Career Highlights

Throughout his career, Yifeng Cui has worked with notable companies such as Fanuc America Corporation and Kla Corporation. His experience in these organizations has contributed to his expertise in semiconductor technology and innovation.

Collaborations

Yifeng has collaborated with several professionals in his field, including Hadi A Akeel and Michael A McNeill. These collaborations have further enhanced his work and contributions to the industry.

Conclusion

Yifeng Cui's innovative patents and career achievements highlight his significant role in advancing semiconductor technology. His work continues to influence the industry and pave the way for future innovations.