Patent ID: 7950807

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 minimum wattage and a maximum wattage of the lamp and a check sum in predetermined order, said projector comprising: a lamp power supply for driving said lamp loaded in said projector, said lamp power supply being provided in advance with a plurality of mode ranges each as a range from a minimum wattage to a maximum wattage of output of said lamp power supply, and one predetermined mode range of said plurality of mode ranges being freely set in said lamp power supply; and a control circuit for controlling said lamp power supply; 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 sets a range from the minimum wattage to the maximum wattage included in the lamp serial code as a code range, and compares the code range with said mode range set in said lamp power supply, said control circuit determines a range not exceeding said maximum wattage of said predetermined lamp as a lamp driving controlling range within which the driving of said lamp power supply is controlled on a basis of a result of comparison of said code range with said mode range, and said control circuit controls the driving of said lamp power supply within the determined lamp driving controlling range.