Patents by Inventor Tomoo Doi

Tomoo Doi 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 holding structure in a lens block forming all or part of an optical system and method of assembling the lens block
    Patent number: 6215603
    Abstract: A lens holding structure in a lens block forming all or part of an optical system, the lens holding structure capable of attaining a compact lens block of inexpensive and simple construction by using a holding barrel having an outer diameter smaller than an outer diameter of the largest lens element to be included in the lens block. The largest lens element is fixed to another lens element to be included in the lens block or the holding barrel by a face thereof having a predetermined angle with respect to an optical axis of the lens block.
    Type: Grant
    Filed: January 7, 1999
    Date of Patent: April 10, 2001
    Assignee: Minolta Co., Ltd.
    Inventors: Tetsuo Kohno, Masashi Isono, Tomoo Doi, Hiromu Mukai, Kazuhiko Ishimaru
  • Zoom lens system having two lens units
    Patent number: 6025961
    Abstract: A zoom lens system has a first lens unit and a second lens unit from the object side. The first lens unit has a negative optical power. The second lens unit has a positive optical power. The second lens unit is arranged on the image side of the first lens unit. An air space between the first and second units is variable for zooming. The second lens unit has a doublet lens element composed of a positive lens element and a negative lens element cemented together.
    Type: Grant
    Filed: April 7, 1998
    Date of Patent: February 15, 2000
    Assignee: Minolta Co., Ltd.
    Inventors: Tetsuo Kohno, Hiroyuki Matsumoto, Tomoo Doi