Light source unit able to emit light which is less influenced by interference fringes
A light source unit includes a plurality of light sources that light source elements which emit laser beams and collimator lenses which collect the laser beams emitted from the light source elements are combined therein. Pencils of light emitted from the light source elements are made to be collected in different collecting degrees between the light sources respectively.
1. A light source unit comprising:
a plurality of light sources, each of the plurality of light sources combining (i) a light source element which emits a laser beam, and (ii) a collimator lens which is aligned with the light source element so as to collect the laser beam emitted from the light source element, wherein each of the laser beams emitted from the light source elements of the plurality of light sources has a wavelength range of a same color, and wherein collecting degrees of pencils of the laser beams which are respectively emitted from the collimator lenses are different from one another, the collecting degrees being degrees to which the pencils of the laser beams are diffuse or convergent; and
a microlens array and a condenser lens which superpose the pencils of the laser beams emitted from the collimator lenses and having the respective different collecting degrees on a predetermined surface of a display element.
2. The light source unit according to claim 1 , wherein radii of curvature of the collimator lenses differ between the collimator lenses.
3. The light source unit according to claim 1 , wherein thicknesses of the collimator lenses differ between the collimator lenses.
4. The light source unit according to claim 1 , wherein materials of the collimator lenses differ between the collimator lenses.
5. The light source unit according to claim 1 , wherein distances between the light source elements and the collimator lenses of the light sources differ between the collimator lenses.
6. The light source unit according to claim 1 , wherein the individual light source elements of the plurality of light sources emit light in the same wavelength range.
7. A projector comprising:
the light source unit according to claim 1 ;
a display device onto which light source light from the light source unit is shone to thereby form image light;
a projection side optical system which projects the image light emitted from the display device onto a screen; and
a projector control unit which controls the display device and the light source unit.