Abstract: There are provided a coherent light source apparatus and a projector that achieve avoiding of an issue that uniformity in projected light is degraded by a speckle that inevitably appears upon projection of coherent light of a semiconductor laser, any other laser, etc., and each including: a coherent light source; a first optical system configured to project light derived from a first light emission region to form a second light emission region, the first light emission region being formed on basis of the coherent light source; a light deflection section configured to deflect a bundle of rays in vicinity of the second light emission region, the bundle of rays being related to formation of the second light emission region; a second optical system provided downstream of the light deflection section; and a light mixing section provided downstream of the second optical system, and configured to mix components of angles and positions of rays incident on an incident end.

Abstract: A light source device which can also advantageously control the growth of the projection using the DMD type is achieved in a light source device which has an ultrahigh pressure discharge lamp) in which the silica glass discharge vessel is filled with greater than or equal to 0.15 mg/mm3 mercury and bromine; a feed device; an oval reflector; and a color wheel by the electrode on the side of the opening of the oval reflector of the discharge lamp having an increased diameter, and the relation 0.06<W/I2<0.96 between the volume W (mm3) of the tip area with increased diameter and the current value I being satisfied.

Abstract: Optical apparatus with a discharge lamp and a concave reflecting mirror, the concave reflecting mirror has a front elliptical reflecting mirror portion, a middle spherical reflecting mirror portion, and a rear elliptical reflecting mirror portion; the relationship between an angle ? between a virtual tangential line VTL, which runs from the center position between the electrodes to the outer surface of the electrode positioned towards the neck of the concave reflecting mirror, and the beam axis Z and an angle ? between a virtual straight line VSL, which runs from the center position between the electrodes to the boundary position between the middle spherical reflecting mirror portion and the rear elliptical reflecting mirror portion, and the beam axis Z is ?>?; and the relationship between the volume V of the electrode E1 (mm3) and the wattage (P) meets the condition, 0.07×EXP(0.014×P)<V.

Abstract: To provide an optical apparatus that can use a lamp's radiant energy efficiently and that is suited to demands for smaller size.

Abstract: A light source device which can also advantageously control the growth of the projection using the DMD type is achieved in a light source device which has an ultrahigh pressure dicharge lamp) in which the silica glass discharge vessel is filled with greater than or equal to 0.15 mg/mm3 mercury and bromine; a feed device; an oval reflector; and a color wheel by the electrode on the side of the opening of the oval reflector of the discharge lamp having an increased diameter, and the relation 0./06<W/I2<0.96 between the volume W (mm3) of the tip area with increased diameter and the current value I being satisfied.