Patent ID: RE44164

Claim:
A multiple wavelength light emitting device for emitting light of a plurality of differing wavelengths comprising: light emission means for emitting light containing wavelength components to be output; a reflecting layer placed in proximity to on one side of said light emission means; a semi-reflecting layer group opposite said reflecting layer with said light emission means therebetween, the semi-reflecting layer group having semi-reflecting layers that reflect some light emitted from said light emission means having specific wavelengths and that transmit the remainder of the light emitted from said light emission means, stacked in order, in a direction of light advance so as to correspond with light wavelengths to be output; and two or more light emission regions wherein the wavelength of the output light differs wherein: the distance between the reflecting layer for light from the light emission means side of the semi-reflecting layer group that partially reflects light output from that light emission region and a point at which light is emitted, existing in an interval from an end surface of said light emission means on the semi-reflecting layer group side to a surface of said reflecting layer, is adjusted so as to have an optical path length such that light of the wavelength output from that light emission region resonates and having an optical path length such that the light of the wavelength output from the light emission region resonates , wherein said point in the interval from the end surface of said the light emission means on the semi-reflecting layer group side to the surface of said reflecting layer is a light emission point in said light emission means , wherein the light emission means is separated into at least a first light emission region and a second light emission region, the first light emission region has a first transparent electrode layer and a first light emitting layer, the first light emitting layer being located on the reflecting layer side of the first transparent electrode layer, the second light emission region has a second transparent electrode layer and a second light emitting layer, the second light emitting layer being located on the reflecting layer side of the second transparent electrode layer, the first transparent electrode layer is separated from the second transparent electrode layer, and the first light emission layer is separated from the second light emission layer .