Patents by Inventor Tetuya Akagi

Tetuya Akagi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Reflection-type photoelectric switch, fresnel lens and method of manufacturing said lens
    Patent number: 5142416
    Abstract: A reflective-type photoelectric switch projects emitted light from a light-emitting element toward a detection zone by a light-projecting optical system, and guides reflected light from an object to be detected in the detection zone to a light-receiving element by a light-receiving optical system. A special optical element is used in part of at least one of the two optical systems. The optical element functions to diverge light in a direction parallel to a plane containing the optic axes of the light-emitting and light-receiving elements, and condense light in a direction perpendicular to the same plane. As a result, it is possible to detect, with excellent sensitivity, both an object which is far from the switch and an object very near the switch.
    Type: Grant
    Filed: February 15, 1990
    Date of Patent: August 25, 1992
    Assignee: Omron Corporation
    Inventors: Arata Nakamura, Tetuya Akagi, Fumihiko Misumi, Satoru Shimokawa, Shinya Tamino