Patent ID: 7816871

Claim:
A projector for projecting an image on the basis of image information, comprising: a light source device that is used as a light source for the projected image and includes: a solid-state high-frequency oscillator that generates microwaves; an amplifying unit that amplifies the microwaves output from the solid-state high-frequency oscillator; a light emitting body that has a material emitting light by the microwaves filled therein; and a power control unit that adjusts an amplification factor of the amplifying unit for the microwave, wherein the power control unit adjusts the amplification factor of the amplifying unit such that microwave power having a pulse form that is higher than the microwave power radiated to keep the light emitting body emitting light is radiated to the light emitting body to turn on the light emitting body, wherein the light source device further includes: an antenna that radiates the microwaves amplified by the amplifying unit; and a sealed hollow cavity that has at least a portion of the antenna and the light emitting body accommodated therein, and an inner surface of the hollow cavity is a curved surface that reflects the microwaves radiated from the antenna to be concentrated on the light emitting body.