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. 30, 2004
Filed:
Feb. 19, 2002
Applicant:
Inventor:
Takayuki Ehara, Tokyo, JP;
Assignee:
Max Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01G 4/700 ; H01G 9/00 ;
U.S. Cl.
CPC ...
H01G 4/700 ; H01G 9/00 ;
Abstract
When a solenoid drive current I is controlled toward a certain target current value I , overshoot and undershoot relative to the target current value are repeated such that the current settles down to the target current value. The solenoid drive current is so controlled as to settle down to the target current value after the current is swung up and down. As a result, the attracting force settles down to the midway point of the variation between the attracting force characteristics in the current-increasing direction and the current-reducing direction, respectively, of the solenoid actuator. The hysteresis characteristics can be canceled out.