The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2000
Filed:
May. 22, 1998
Hiroshi Nomura, Saitama-ken, JP;
Kazuyoshi Azegami, Tokyo, JP;
Takamitsu Sasaki, Saitama-ken, JP;
Kazunori Ishizuka, Kanagawa-ken, JP;
Asahi Kogaku Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens barrel includes a stationary barrel; a first rotational feed barrel which is engaged with the stationary barrel by means of helicoids; a first linear movement barrel which is engaged with the first rotational feed barrel so as to relatively rotate and to relatively move together along the optical axis and which is provided on the inner peripheral surface thereof with a female helicoid; a second rotational feed barrel which has a male helicoid and a female helicoid on the outer and inner peripheral surfaces thereof respectively; a rotational transmission barrel which is engaged with the first rotational feed barrel so as to relatively move along the optical axis and to rotate together, and which is integrally connected to the second rotational feed barrel; a second linear movement barrel which is provided on outer peripheral surface thereof with a male helicoid which engages with the female helicoid of the second rotational feed barrel; a lens group that is held by said second rotational feed barrel; and at least one lens group which is guided to linearly move independently of the second linear movement barrel.