Ronald F Tokarz

Title: The Innovations of Ronald F. Tokarz

Introduction

Ronald F. Tokarz is a notable inventor based in Endwell, NY (US). He has made significant contributions to the field of circuit assembly testing, holding a total of 2 patents. His work focuses on developing innovative methods and apparatuses that enhance the reliability and performance of circuit board assemblies.

Latest Patents

Tokarz's latest patents include a heated circuit assembly tester and method. This invention features a heated unit designed for testing circuit board assemblies. An insulated enclosure receives card assemblies to be tested through a door. A heater within the enclosure heats the card assemblies at a constant regulated temperature. A motor separately applies angular displacement to the card assemblies, which are held in a fixture to stress solder joints between a card substrate and components on the card substrate. The angular displacement is maintained at a predetermined amplitude during tests, providing a controlled repeatable stress for the components, which may be repeated between batches of the circuit cards being tested.

Another significant patent by Tokarz is an apparatus and method that provides a testing process and a machine for implementing a testing process to produce failures on a heated circuit card. This apparatus applies a controlled, repeatable shear stress to the joints between a circuit board and its mounted components. The circuit board is heated, and one end is twisted with respect to a second end to produce stresses within the circuit board, simulating those imposed on components due to thermal cycling. The apparatus may be computer-controlled for regulating the twisting of the circuit board to produce a precise twist angle during a cyclic twisting of the heated circuit board. Electrical resistance of critical joints may be monitored during the testing, and a database compiled identifying the cycle count at which a failure occurs and the location of the failure on the circuit board.

Career Highlights

Tokarz is currently associated with International Business Machines Corporation (IBM), where he continues to innovate and contribute to advancements in technology. His work has been instrumental in improving testing methodologies for circuit boards, ensuring higher reliability and performance in electronic devices.

Collaborations

Throughout his career, Tokarz has collaborated with notable colleagues, including Gerard Truman Dickinson and James Lee McGinniss, Jr. These collaborations have further enriched his work and contributed to the development of innovative solutions in the field.

Conclusion

Ronald F. Tokarz is a distinguished inventor whose contributions to circuit