Abstract: A light source device includes a control unit. The control unit is configured to adjust a first drive current value of a first laser light source unit and a second drive current value of a second laser light source unit, on the basis of a first measurement result and a second measurement result. The first measurement result is acquired by a first sensor measuring a first light quantity of red light included in white light that is synthesized and emitted by the polarization separation element. The second measurement result is acquired by a second sensor measuring a second light quantity of blue light included in the white light.

Abstract: A light source device includes: a first laser light source which emits first laser light; and a diffusion element which is provided on an optical path of the first laser light and diffuses the light, wherein the diffusion element includes: a first lens array in which a plurality of first lens elements that divide the first laser light into a plurality of light fluxes are arranged; and a second lens array in which a plurality of second lens elements that emit the light fluxes incident via the plurality of first lens elements toward an image formation plane are arranged, wherein the first lens array is disposed on an incidence surface of the diffusion element, wherein the second lens array is disposed on an emission surface of the diffusion element, and wherein at least two second lens elements among the plurality of second lens elements form light source images having different sizes in different regions on the image formation plane.

Abstract: A light source device includes a laser source unit, a rotating body including a phosphor layer and a reflective diffusion plate, and an optical path forming member that divides the emitted light of the laser source unit into a first laser beam and a second laser beam, irradiates the reflective diffusion plate with the first laser beam, and irradiates the phosphor layer with the second laser beam. The optical path forming member includes a first reflection plate with a through-hole and a first collimator lens. The first laser beam passes through the through-hole and the first collimator lens in that order and enters the reflective diffusion plate, and the diffused light from the reflective diffusion plate passes through the first collimator lens and enters the first reflection plate.

Abstract: A light source device includes a light source unit that emits monochromatic light, a reflection plate that reflects a part of the emitted light from the light source unit, a holding unit that holds the reflection plate so as to be movable in a direction intersecting the optical path of the emitted light, and a control unit that moves the reflection plate to adjust the quantity of the reflected light that is the part of the emitted light reflected by the reflection plate.

Abstract: A light source device includes a first laser source and a diffusion element that diffuses light, the diffusion element being provided on an optical path of a first laser beam emitted by the first laser source. The diffusion element comprises, on an incident surface, a first lens array in which a plurality of first lens elements are arranged that divide the first laser beam into a plurality of light beams and further comprises, on an exit surface, a second lens array in which a plurality of second lens elements are arranged that each face a respective first lens element of the plurality of first lens elements and that each emit a light beam incident through the facing first lens element toward an imaging surface. Each second lens element forms a light source image in a different region on the imaging surface.

Abstract: A light source device is provided in which the number of LD chips can be easily optimized and that has a high light utilization efficiency. The light source device includes a first light source unit that emits a first monochromatic light, a second light source unit that emits a second monochromatic light of the same color as the first monochromatic light, an optical member that splits the first monochromatic light emitted by the first light source unit into a first split light and a second split light and that integrates the first split light and the second monochromatic light emitted by the second light source unit into one optical path, and a phosphor unit that receives the second split light or the integrated light to emit fluorescent light.