Yu-En Percy Chang

Title: Innovations by Yu-En Percy Chang in Precision Lapping Technologies

Introduction

Yu-En Percy Chang is a renowned inventor based in Mountain View, CA, with a significant contribution to the field of precision lapping technologies. With a total of six patents to his name, his work focuses on creating systems and methods to enhance surface finishing, particularly in high-precision applications.

Latest Patents

Yu-En Percy Chang's latest patents include an "Apparatus and system for precise lapping of recessed and protruding elements in a workpiece" and an "Apparatus and method for precise lapping of recessed and protruding elements in a workpiece." The first patent features an advanced system with an air-bearing surface that encompasses embedded electrical components to ensure accurate surface dimensions. This innovative system employs a non-abrasive lapping plate designed with grooves, supported by a structure that exposes the air-bearing surface during the lapping process. The integration of a non-abrasive liquid facilitates a smooth lapping action while maintaining the dimensional uniformity of crucial components.

In his second patent, Yu-En introduces a lapping method that uses textured and conditioned plates to refine the surfaces of magnetic heads. This process not only enhances surface quality but also reduces susceptibility to electrical shorts. The method incorporates both rough and polishing phases, employing conductive liquids for lubrication and static charge mitigation, further ensuring optimal finishing results.

Career Highlights

Throughout his career, Yu-En Percy Chang has worked with prestigious companies such as Hitachi Global Storage Technologies and IBM. His experience in these organizations has propelled his innovative thinking and technical capabilities, contributing significantly to advancements in precision engineering.

Collaborations

In his professional journey, Yu-En has collaborated with notable colleagues, including Yuri Markevitch and Mark McMaster. These collaborations have played a pivotal role in shaping his inventions and pushing the boundaries of lapping technology.

Conclusion

Yu-En Percy Chang's contributions to precision lapping technologies through his patents illustrate his dedication to improving surface finishing processes in various applications. His innovative approaches continue to impact the industry, demonstrating how focused efforts in invention can drive significant advancements in technology.