JP2009181735A5 - - Google Patents

Claims (6)

A microwave power source that outputs microwaves;
Luma microwave excitation lamp to emit light by irradiation of the microwaves,
A transmission line connecting the microwave power source and the microwave excitation lamp,
The microwave excitation lamp is:
A first antenna made of a conductive material;
A second antenna made of a conductive material;
A sealing portion that encloses a luminescent material that emits light when irradiated with the microwave; and the end portion of the first antenna and the end portion of the second antenna are spaced apart from each other inside the sealing portion. And an arc tube disposed opposite to each other,
The transmission line is
A first conductor is a conductor that connects to said first antenna,
An insulator covering the first conductor ;
And a second conductor is a conductor covering the insulator,
It said second conductive member has a length from the position of the connecting portion between the first antenna and the first conductor to the end of the microwave excitation lamp side of the second conductor, 1/4 of the microwave A light source device having a wavelength longer than that . The microwave excitation lamp, before Symbol light source apparatus according to claim 1, wherein the end portion of the side is connected to the first conductor of the first antenna characterized in that it extends outside of the arc tube. The light source device according to claim 1, wherein an inner diameter of the second conductor is smaller than a quarter wavelength of the microwave. The ratio between the outer diameter d of the first antenna and the inner diameter D of the second conductor is:
If the relative dielectric constant of the space formed between the second conductor and the antenna is εr,
The impedance Zo on the first antenna side at the connecting portion between the first conductor and the first antenna is set to satisfy Zo = [138 / √ (εr)] log10 (D / d) = 50 [Ω]. the light source device according to any one of claims 1 to 3, characterized in the that the. The length of the first antenna in the arc tube, the length of the second antenna in the arc tube, the first antenna and the distance between the opposite ends of the second antenna, the length including the micro 5. The light source device according to claim 1, wherein the light source device is an integral multiple of a half wavelength of a wave. A light source device according to any one of claims 1 to 5,
A light modulator that modulates the light beam emitted from the light source device according to image information to form an optical image;
A projector that projects the optical image formed by the light modulator.