Ronald J Pellar is a notable inventor based in Sierra Madre, CA (US). He has made significant contributions to the field of electronic halftone generation. With a total of 2 patents, Pellar's work has advanced the technology used in document reproduction.

Latest Patents

Pellar's latest patents focus on an electronic halftone generator. This method and apparatus allow for the scanning of document originals, whether black and white or color, and reproducing corresponding halftone reproductions either locally or at a remote location. A halftone signal is generated by pulse width modulating or comparing the scanned or video signal with a periodic signal that has two frequencies and phases. This process creates a dot pattern output that is a function of the frequency and phase of the two combined modulating signals. The halftone reproduction generated features variable dot configurations that are controllable, enabling both rotation of the dot pattern (screen angle) and geometric modifications of the dot pattern. In cases where the document original is in color, light of three different colors scans the document, with each resultant video signal being processed accordingly. In a preferred embodiment, different screen angles are utilized for each color that comprises the reproduction.

Career Highlights

Pellar has had a distinguished career, primarily working with Xerox Corporation. His innovative approaches have contributed to advancements in document technology and reproduction methods.

Collaborations

One of Pellar's notable coworkers is Leland D Green. Their collaboration has likely fostered further innovations in their respective fields.

Conclusion

Ronald J Pellar's contributions to electronic halftone generation have significantly impacted the technology used in document reproduction. His patents reflect a deep understanding of the complexities involved in creating high-quality halftone images.