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:
Nov. 19, 2019
Filed:
Feb. 12, 2018
Yamaha Corporation, Hamamatsu-shi, JP;
Hiroshi Harimoto, Hamamatsu, JP;
Ichiro Osuga, Hamamatsu, JP;
YAMAHA CORPORATION, Hamamatsu-Shi, JP;
Abstract
In a key switch (), an inner dome (Din) starts to deform once a distal end portion () of the inner dome (Din) comes into contact with a base surface () after an outer dome (Dout) starts to deform. A thick portion () extending straight and having a uniform wall thickness in a click generating portion (CL) has the thickness less than or equal to the minimum thickness of a thick portion () of an after stroke portion (AF). The degree of inclination of the thick portion () with respect to a center line (C) (direction of pressing) is larger than that of the thick portion () with respect to the center line (C) (θc>θa). Before the after stroke portion (AF) undergoes large deformation, the click generating portion (CL) undergoes buckling to cause a sudden decrease in a reaction force and generate a click feeling.