| 摘要 |
<p>PURPOSE:To securely turn on a switch even if key depression is not enough by pressing a switch for initial data detection by a hammer arm which is rotated and displayed according to the key depression displacement of the key. CONSTITUTION:A hammer pressing protrusion 12 is provided vertically at the reverse surface center part of the key 2. Then the hammer arm 13 is constituted so that when pressing force is applied by the hammer pressing protrusion 12, the arm rotates against the pressing operation to place a necessary load on the key 2 through the hammer pressing protrusion 12 and also presses switches 31 and 32 for initial data detection provided faceup opposite one end of the hammer arm 13 of a keyboard chassis 1. Consequently, even when the key is pressed insufficiently, the switches 31 and 32 for initial data detection are securely turned on having a specific time difference.</p> |
