Ian Turner

Title: Innovations of Ian Turner

Introduction

Ian Turner is a notable inventor based in Sunnyvale, CA. He holds a total of 6 patents that showcase his contributions to the field of optical disk technology. His work has significantly advanced the methods of data storage and retrieval.

Latest Patents

One of his latest patents is titled "Logarithmic servo error detection for optical disk drive." This invention presents an improved focus and tracking error detection circuit for an optical disk servo system. The circuit calculates the logarithm of the signal from each of at least a pair of photodetectors. The difference between two logarithmic signals is then determined to give an error signal. This invention takes advantage of the property of logarithms, making the error signal a ratio rather than an absolute difference signal, which is less sensitive to variations affecting both signals. Additionally, the logarithmic circuits minimize variations that affect the photodetectors unequally by performing an AGC-type function. The error signal is inhibited during a write pulse to the laser to prevent saturation of the amplifiers. An automatic, periodic offset adjustment is provided by turning off the laser and varying an offset voltage until the error signal is zero. Peak detectors are used to eliminate the effects of data signals.

Another significant patent is the "Apparatus and method for detecting and compensating for pit extension in optical recording media." This system is designed for storing and retrieving encoded data on an optical recording medium using pit edge detection. The pit extension characteristics of a given medium are determined by using laser beam test write pulses to form pits on the medium and detecting the time durational difference between the pulse width of the test write pulses and the duration of the leading edge transitions to trailing edge transitions of the corresponding pits formed. This difference value may be stored in a certification sector of the medium, allowing subsequent write pulses to be modified in duration to account for this detected durational difference.

Career Highlights

Ian Turner has worked with prominent companies such as Xerox Corporation and Laserdrive Ltd. His experience in these organizations has contributed to his expertise in optical technologies and innovations.

Collaborations

Throughout his career, Ian has collaborated with notable individuals, including Thomas A Tacklind and Theodore D Rees. These collaborations have further enriched his work and contributions to the field.

Conclusion

Ian Turner's innovative patents and career achievements highlight his