| 摘要 |
A password input keyboard for preventing to be peeped, includes a character plate linked with a password input control circuit, an operation key, and an indication plate, sets many characters on the surface of the character plate, sets an indication hole and two or more invalid indication holes on the surface of the indication plate, the indication hole and the invalid indication hole are homogeneously distributed on the indication plate. The setting conditions of the character on the character plate are the following: when the character plate or the indication plate rotates around a center axis which perpendicular to the center of the surface of the indication plate or the character plate, the indication hole on the indication plate ordinal points to the character on the character plate; when the indication hole lies the position of any character on the character plate, at least two invalid indication holes also respectively points to the position of the character on the character plate. |
