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. 25, 2003
Filed:
Dec. 27, 2000
Isao Mochizuki, Kaizu-gun, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
In a key switch device, the depressing load applied to a key top when depressed is defined by a function (equation 26) expressed by: a distance L between the rotation point o of a support shaft of a first link member at a first engagement portion in the key top and the slide starting point s of a support shaft of the first link member at a third engagement portion ; a distance L1 between the rotation point o and the acting point m at which the urging force of the coil spring acts on the first link member ; an angle &thgr;4 between a line segment extending from the rotation point o to the slide starting point s and the direction along which the support shaft of the first link member at the third engagement portion is allowed to slide; and various characteristic values of the coil spring . In relation to the depressing load curve P defined by the function, based on the difference in loads between the maximum point P1 in an upward projecting curve and the minimum point P2 from which the depressing load is increased after the switching operation, the key clicking function is performed.