| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability of key units and to improve the operability of keys. SOLUTION: This device consists of key units 30 each formed by molding a key main body 32 and a key support part 33 supporting it, and a connection part 34, connecting the key main body 32 to the key support part 33 so that it can swing in key pressing/releasing directions, out of resin in one body. In this case, a gate corresponding part 34d into which resin is injected at the time of the molding of the key unit 30 is formed at the connection part 34 of the key unit 30 or the key-width directional intermediate part of the rear end part of the key main body 32. Consequently, the resin injected from the gate of a metal mold is made to flow uniformly toward the key main body and to the key support part 33 through the connection part, thereby making uniform, specially, the connection part as the fulcrum part of the key unit 30 and improving the strength. |
