Location History:
- Ohtsu, JP (1993)
- Kyoto, JP (1997 - 2007)
Company Filing History:
Years Active: 1993-2007
Title: The Innovations of Yo Sawamura
Introduction
Yo Sawamura is a prominent inventor based in Kyoto, Japan. He has made significant contributions to the field of memory devices and motor control circuits. With a total of 5 patents to his name, Sawamura continues to push the boundaries of technology.
Latest Patents
One of his latest patents is a memory device with a built-in test function and method for controlling the same. This innovative test circuit employs hardware to test a memory cell in a memory block. The address of an error cell detected is stored in a first or second error address register. Access made by a processor to the address of the error cell is detected by a first or second address comparator. Data is then written to a first or second correction register, which serves as an alternative cell, or data is read from one of the registers. Another notable patent is a motor control circuit that reduces the speed control gain and disables. This circuit generates a signal representing the rotation frequency of a motor and produces a motor speed error signal based on that frequency. The error signal is modified by a speed gain circuit and supplied to the motor driving circuit through a filter, which prevents oscillation in a servo loop. When the motor speed is out of a predetermined range, the gain of the speed error signal is reduced, and the filter is disabled.
Career Highlights
Yo Sawamura is currently employed at Rohm Co., Ltd., where he continues to innovate and develop new technologies. His work has had a significant impact on the industry, particularly in the areas of memory devices and motor control systems.
Collaborations
Throughout his career, Sawamura has collaborated with notable colleagues, including Kyoji Marumoto and Tatsuhiko Murata. These collaborations have further enhanced his contributions to the field.
Conclusion
Yo Sawamura's innovative work in memory devices and motor control circuits showcases his expertise and dedication to advancing technology. His patents reflect a commitment to solving complex problems and improving existing systems.