Munro K Haynes

Title: Munro K Haynes: Innovator in Optical Disk Technology

Introduction

Munro K Haynes is a notable inventor based in Tucson, AZ, who has made significant contributions to the field of optical disk technology. With a total of 5 patents to his name, Haynes has focused on developing efficient and innovative solutions for optical disk servo systems.

Latest Patents

One of Haynes' latest patents is centered around optical disk sector servo patterns. This invention provides easily-fabricated, high track density, size-tolerant, and efficient sector servo patterns for optical disks. The technology includes codes designed for use with sector tracking optical disk servo systems. By utilizing marks larger than the spot size, the invention addresses resolution problems and the limitations of photolithographic processes. The design achieves independence from line-width variations through a balancing technique. The servo information is represented in the form of pits or depressions in the substrate surface, which can be created by exposing a photoresist through a mask followed by etching. The servo detectors are capable of sensing changes in reflectance from the disk due to the cancellation of light waves from two differing depths. The optimum depth for this application is one-quarter wavelength in the substrate, ensuring that the contributions from the two depths are out of phase, resulting in maximum signal output. However, this configuration means that no data can be written or read in the servo sectors. The reflectance of the disk varies depending on the position of the spot relative to the depressions, providing a reliable method for tracking.

Another significant patent by Haynes involves a buried servo recording system using a phase-encoded servo pattern. This invention features a track-following servo system for a magnetic disk file that employs a buried servo pattern containing two types of signals. The first is a reference signal of frequency f, while the second type consists of control signals of frequency 2f, with adjacent control signals being 180 degrees out of phase with each other.

Career Highlights

Haynes has had a distinguished career, working at the International Business Machines Corporation (IBM), where he has been able to apply his innovative ideas in a collaborative environment.

Collaborations

Throughout his career, Haynes has worked alongside notable colleagues such as Neils H Hansen and Samuel D Cheatham, contributing to advancements in technology and innovation.

Conclusion

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