| 摘要 |
A soft tactile urethane transparent plastic membrane structure printed keyboard is disclosed which provides a soft tactile individual membrane over each separate printed indicia wherein each individual membrane structure is clear, raised, domed, visually transparent and soft to the touch. The soft tactile urethane membrane structures provide raised key tip contact means which permit keyboard operation by feel of the keyboard. The urethane plastic membrane structures, when compressed, activate respective membrane switches in an electrical control circuit.
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