Title: Keyboard apparatus
Application Number: 200410100033 Application Date: 2004.11.30
Publication Number: 1648990 Publication Date: 2005.08.03
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G10B3/12,G10H1/34
Applicant(s) Name: Roland Corp. Address:
Inventor(s) Name: Nagaoka Yasunori, Uno Shiro
Attorney & Agent: hu qiang yang songling
Abstract:
     The invention provided a keyboard device which has high operability and is thin and precisely detects the key depressing speed. When depressing force is increased, the skirt section 42i of a rubber switch is inflated, and a first movable contact point comes into contact with a first fixed contact point formed on a printed circuit board 40a. Under this condition, there exists a gap between the top section of a protrusion 42d formed on the top section of the first movable contact point 42a and an actuator section 30f of a key, and a gap also exists between a second movable contact point 42b and a second fixed contact point formed on the printed circuit board 40a. Moreover, when a section to be driven is driven in the downward direction, the actuator section 30f of the key is abutted against the surface of the protrusion 42d formed on the top section of the first movable contact point 42a at nearly the same time as when the second movable contact point 42b comes into contact with the second fixed contact point formed on the printed circuit board 40a.
Time: 19
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