Patents by Inventor Katura Nakajima

Katura Nakajima 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).

  • Light amount adjusting apparatus and projector using the same
    Patent number: 7344255
    Abstract: At least a pair of light amount adjusting plates is allocated at peripheral side rim portions of a light path through which light from a light source is projected. These light amount adjusting plates are drivable between a narrow-down position in which they enter into the light path and a retreat position in which they retreat to outside of the light path. A restriction member such as a stopper member restricts a rotation of the light amount adjusting plate at the retreat position, and a holding unit holds the light amount adjusting plate to this restriction member. The restriction member blocks a predetermined angle or further rotation of the light amount adjusting plate, and the holding unit, such as a spring or a magnet, biases the light amount adjusting plate to the restriction member.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: March 18, 2008
    Assignee: Nisca Corporation
    Inventors: Toyoyuki Hara, Katura Nakajima, Tokuro Kusunoki, Yukihiko Hayakawa
  • Light amount adjusting apparatus and projector using the same
    Publication number: 20050219474
    Abstract: At least a pair of light amount adjusting plates is allocated at peripheral side rim portions of a light path through which light from a light source is projected. These light amount adjusting plates are drivable between a narrow-down position in which they enter into the light path and a retreat position in which they retreat to outside of the light path. A restriction member such as a stopper member restricts a rotation of the light amount adjusting plate at the retreat position, and a holding unit holds the light amount adjusting plate to this restriction member. The restriction member blocks a predetermined angle or further rotation of the light amount adjusting plate, and the holding unit, such as a spring or a magnet, biases the light amount adjusting plate to the restriction member.
    Type: Application
    Filed: February 18, 2005
    Publication date: October 6, 2005
    Applicant: NISCA CORPORATION
    Inventors: Toyoyuki Hara, Katura Nakajima, Tokuro Kusunoki, Yukihiko Hayakawa