| 摘要 |
A keypad security device (10) comprises an enclosure (14) having a viewing aperture (26) and an access aperture (30). The enclosure (14) at least partially surrounding a keypad such that the keypad is viewable through the viewing aperture (26) and accessible by a user through the access aperture (30), the viewing aperture including a security pane (36) arranged so as to permit the keypad to be viewed clearly from the point of view of a user of the keypad and to prevent the keypad from being viewed from the point of view of a person other than the user, wherein the security pane (36) includes a refractive lens. |
