William C Turner

Title: William C. Turner and Electronic Exposure Control.

Introduction

William C. Turner is an inventor associated with Northridge, California, and Terminal Data Corporation. His work includes a patent for an electronic exposure control designed to maintain consistent image density when photographing successive documents on microfilm.

Latest Patents

Turner’s listed patent is “Electronic Exposure Control.” It describes a system that senses illumination reflected from a moving document using an opto-photoelectric pickup selected for a particular spectral characteristic. Electronic analog logic samples and holds the illumination measurement, derives a timing interval inversely related to that measurement, and uses an adjustable ramp generator and comparator to produce an exposure-stop signal. The signal can operate a translational shutter through a stepper motor, helping maintain consistent background density despite differences in document reflectivity. A manual mode provides fixed exposure for documents with unusual reflectivity. Turner is credited with 1 patent.

Career Highlights

Turner’s patented system addresses a practical challenge in document imaging: achieving reliable exposure across materials with varying backgrounds. Its automatic control adjusts exposure based on reflected illumination, while the manual mode offers an alternative when automatic measurement may not suit a document.

Collaborations

Turner’s listed coworkers include John S. Burton and William R. Limburg. The available information does not specify their roles in the patent or their particular contributions.

Conclusion

William C. Turner’s “Electronic Exposure Control” reflects an engineering approach to improving consistency in microfilm imaging through automatic exposure adjustment and a manual operating option.