Patents by Inventor Kazusige Hirasawa

Kazusige Hirasawa 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).

  • Lens contamination preventive device of light-beam heater
    Patent number: 5812314
    Abstract: A lens contamination preventive device comprises a gas jetting device for jetting out gas and a gas suction device for suctioning gas which are disposed to face each other with respect to an optical axis of light emitted through a lens. The gas jetting device and the gas suction device are disposed so as to form a layer of gas jet stream in the vicinity of a surface of the lens. The gas jetting device has a gas jetting port, a width of which is greater than a diameter of the lens. The gas suction device has a rate of suction greater than a rate of jet from the gas jetting device.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: September 22, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Kuriaki, Kazusige Hirasawa