Patents by Inventor Makoto Iwasawa

Makoto Iwasawa 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).

  • Dust-proof structure for optical pickup unit
    Patent number: 5790511
    Abstract: An optical pickup unit is formed such that a portion on an upstream side of the air flow has a streamline shape or similar shape to the streamline shape so as to keep the air flow generated with high speed rotations of a disc-shaped recording medium away from a vicinity of an objective lens. According to this arrangement, dust contained in the air flow can be prevented from adhering to the surface of the objective lens. Moreover, the dust will not enter inside the optical pickup unit through a small clearance between a lens holder of the objective lens and a cover for the optical pickup unit.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: August 4, 1998
    Assignees: Sharp Kabushiki Kaisha, Ricoh Company, Ltd.
    Inventors: Hiromi Juso, Makoto Iwasawa, Hiroshi Koide, Tetsuo Kanno