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. 03, 1987
Filed:
Jul. 09, 1984
Applicant:
Inventor:
Masahiko Aiba, Nara, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
361153 ; 361154 ;
Abstract
A solenoid drive system includes a driver circuit which functions to gradually increase current flowing through a solenoid coil. The attracting force created by the solenoid is proportional to the current flowing through the solenoid coil. When the attracting force becomes greater than a load including the plunger, the plunger moves toward the operating end. At a time when the plunger reaches the operating end, the current is still in the increasing curve and, therefore, an excess force is minimized. This functions to minimize noises created by the plunger movement.