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:
Mar. 20, 2007
Filed:
Sep. 08, 2003
Tsunemichi Tanaka, Tokyo, JP;
Tsutomu Ishizone, Tokyo, JP;
Tsunemichi Tanaka, Tokyo, JP;
Tsutomu Ishizone, Tokyo, JP;
Marumo Electric Co., Ltd., Tokyo, JP;
Abstract
A novel spotlight where the position of image formation does not change even when the zoom adjustment is made after focus adjustment, so that focus adjustment and zoom adjustment can be facilitated. When a drive shaft () is rotated by operating a zoom adjustment handle (), a lens () moves forward and backward according to an unequal pitch (P) of a first screw section (), and a lens () moves forward and backward according to an equal pitch (P) of a second screw section (), so that the distances between the lenses () are changed and zoom adjustment is made. Focusing adjusted by a focus adjustment mechanism (b) does not change even when the distances between the lenses are changed. Therefore, focus adjustment and zoom adjustment can be made extremely simply, and the spotlight can be used particularly useful in performance space such as TV studios and theater stages.