| 摘要 |
A locking mechanism suitable for a door or window comprises a barrel having a passage or keyway, a key insertable into the passage or keyway, one or more light sources for generating and transmitting an optical signal and one or more receivers for receiving the or each optical signal. A number of optically conductive units are arranged substantially regularly within the key for optically coupling the light sources and the receivers so as to operate the locking mechanism. An apparatus for conducting an optical signal suitable for use in the key comprises a plurality of optically conductive blocks, each block cooperating with another to define a pathway for the optical signal in at least two dimensions.
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