Patent ID: 7901087

Claim:
A projector that can be loaded with lamps of a plurality of kinds, each of a plurality of said lamps loadable into said projector being given a lamp serial code formed by arranging lamp information including at least a nominal life time of the lamp and a check sum in predetermined order, said projector comprising a control circuit for performing a clocking operation of a lamp timer for managing a use time of said lamp loaded in said projector; wherein when said lamp loaded in said projector is replaced with a predetermined lamp, said control circuit receives input of said lamp serial code attached to the predetermined lamp, by checking a part corresponding to said check sum in information input as said lamp serial code, said control circuit determines whether the input information is a valid said lamp serial code, when said control circuit determines that the input information is a valid said lamp serial code, said control circuit resets said lamp timer, and resumes the clocking operation of said lamp timer, and when a clocked value of said lamp timer has reached a value based on said nominal life time included in said lamp serial code, said control circuit presents an alarm recommending replacement of said predetermined lamp loaded in said projector.