Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
May 24, 2011
Patent Application Number
12397290
Date Filed
March 3, 2009
Patent Primary Examiner
Patent abstract
In order to detect a state of a key 30, a differential acceleration sensor 38 is provided in addition to a common position sensor 35 and a velocity sensor 36. A reaction force applied by a solenoid unit 20 is determined on the basis of a function which monotonously increases with respect to a differential acceleration signal j in an initial period which is an early stage of depression of a key. After a lapse of the initial period, the reaction force is determined in accordance with velocity, acceleration and the like, referring to a table. As a result, the reaction force rises up rapidly when a key is depressed strongly.
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