Daniel R Marshall

Title: **The Innovative Mind of Daniel R. Marshall**

Introduction

Daniel R. Marshall is a prolific inventor based in Boise, ID, known for his significant contributions to the field of optical systems. With an impressive portfolio of 17 patents, his work primarily focuses on advancements in focus sensing and autofocus technologies. His innovations have played a vital role in enhancing precision in various optical applications.

Latest Patents

Among his many achievements, two of Daniel's most notable patents include the following:

1. **Three-dimensional filter enables adaptive focus sensing**

This innovative focus sensor is designed to measure the state of focus of a light beam through pupil obscuration. By modifying a three-dimensional wavefront with a scattering volumetric filter, it allows for focus detection via a two-dimensional detector. The resulting one-dimensional signal can indicate values of plus, zero, and minus. This solid diffuser, comprising sub-wavelength particles with a high index of refraction suspended in an adhesive, enables a well-behaved focus curve. Its performance over an extended distance supports a focus-controlling servomechanism in the presence of corrupting surface topography or optical defects.

2. **Autofocus system with stray light compensation**

This adaptable autofocus system, suitable for microscopes and other optical systems, utilizes an auxiliary photodetector that measures light solely from a reference light source. By generating a focus error signal based on the displacement of the target from the ideal focal point, this system innovatively compensates for stray light. The correction signal not only influences the focus error signal but can also adjust the output of the reference light source, enhancing the overall focus accuracy.

Career Highlights

Throughout his career, Daniel has worked with notable companies such as Hewlett-Packard Company and Hewlett-Packard Development Company, L.P. His involvement in these organizations reflects his commitment to pushing the boundaries of optical technology and innovation.

Collaborations

Daniel's journey has been marked by collaborative efforts with talented individuals, including coworkers David K. Towner and David Kay Campbell. Through these partnerships, he has been able to share ideas and foster innovation, furthering advancements in the field.

Conclusion

Daniel R. Marshall exemplifies the spirit of innovation with his significant contributions to optical technologies. His latest patents demonstrate a keen understanding of the challenges faced in the industry and his dedication to providing effective solutions. As inventors like Daniel continue to push the envelope, the future of optical systems looks brighter than ever.