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:
Feb. 04, 2003
Filed:
Oct. 12, 2000
Kousaku Saino, Kasaoka, JP;
Takahiro Kobiki, Fukuyama, JP;
Tazmo Co., Ltd., Okayama, JP;
Abstract
A substrate transfer system employs a robot hand which is composed such that a sum length of a first arm and a third arm equal a length of a second arm, and a length of the first arm becomes longer than a length of the third arm. A ratio between arm lengths is determined such that a distal end portion of the first arm, a distal end portion of the second arm, a distal end portion of the third arm, and a distal end portion of the workpiece held by the end effector are inscribed in a track circle around a rotational axis of the first arm as a center. The ratio of the first, second and third arm lengths is approximately 1:({square root over ( )}5+1)/2:({square root over ( )}5−1)/2. This optimized ratio of the arm lengths allows the arm rotational radius to be smaller than the conventional value, and makes it possible to achieve a longer transfer distance in an equal installation area.