PHOTOELECTRIC PUZZLE LOCK

The utility model relates to a self-coding photoelectric puzzle lock of users. The inner parts of slide slots in parallel and in the same distance are provided with N sliding horizontal bar-shaped dialing boards which are provided with M small round bores in the same distance and in the same height. (M-1) small round bores of the M small round bores on every horizontal bar-shaped dialing board are covered by a lightproof material in use, a photoelectric tube sends out an electrical signal when every small bore on the dialing board aims at a straight line between the light source and the photoelectric tube through dialing the dialing board. The lock is opened, or the alarm is given. The users can edit passwords automatically as required, the total number of the passwords can reach M. The utility model has the advantages of simple structure, convenient usage and strong confidentiality, and can be widely used in strongboxes of the departments of banking, finance, financial accounting, etc.