Patents by Inventor Ryoji Nakazawa

Ryoji Nakazawa 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).

  • Video light apparatus
    Patent number: 5394063
    Abstract: A reed switch is provided between a video camera and a battery pack circuit section. A current flowing when the video camera operates is detected by the reed switch. A video light is turned on or off on the basis of the detected current value. When the power source does not reach a specified voltage, the video light is turned off. The outer light amount when photographing is converted into an electric current by a phototransistor. When the current is less than a threshold level, the video light is lit or turned on. The threshold level is varied by a variable resistor.
    Type: Grant
    Filed: November 5, 1993
    Date of Patent: February 28, 1995
    Assignee: Sony Corporation
    Inventor: Ryoji Nakazawa