Patents by Inventor Yasuaki Chino

Yasuaki Chino 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).

  • Automatic focusing device using a light sensor of center-split type
    Patent number: 4857717
    Abstract: An automatic focusing device for use in a video camera comprises a first and a second light-receiving element, a first and a second integration circuit integrating output signals of the first and second light-receiving elements respectively and each having a function of proportional current integration and a function of fixed current integration, a first and a second comparator comparing integration output voltages of the first and second integration circuits with the same threshold voltage respectively, a microcomputer producing a focusing signal by detecting the period of time from a time when one of the integration output voltages of the first and second integration circuits reaches the level of the threshold voltage to a time when the other integration output voltage reaches the level of the threshold voltage, and a detection circuit detecting that one of the integration output voltages of the first and second integration circuits reaches the level of the threshold voltage on the basis of the comparator o
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: August 15, 1989
    Assignee: Hitachi, Ltd.
    Inventor: Yasuaki Chino