A light source apparatus according to an embodiment of the present technique includes a first light source section, a second light source section, a third light source section, and a synthesis section. The first light source section includes a plurality of red laser light sources arranged in an array. The second light source section includes a plurality of green laser light sources arranged in an array. The third light source section includes a plurality of blue laser light sources arranged in an array. The synthesis section synthesizes red laser light emitted from the first light source section, green laser light emitted from the second light source section, and blue laser light emitted from the third light source section to generate white light.

A projection device including a light source, a reflective spatial polarization modulator, a polarization grating, and a projection lens is provided. The light source is configured to provide a light beam. The reflective spatial polarization modulator is disposed on a path of the light beam and configured to reflect the light beam and modulate a polarization state of the light beam. The polarization grating is disposed on the path of the light beam between the light source and the reflective spatial polarization modulator, wherein the reflective spatial polarization modulator reflects the light beam from the reflective spatial polarization modulator back to the polarization grating. The projection lens is disposed on the path of the light beam from the reflective spatial polarization modulator, wherein the polarization grating is disposed on the path of the light beam between the reflective spatial polarization modulator and the projection lens.

A projection display unit (1) includes a projection optical system (10A), a polarization separation device (15), and a detection optical system (10B). The projection optical system includes an illuminator (11), a projection lens (16), and a light valve (12) that modulates illumination light supplied from the illuminator on the basis of an image signal, and outputs the modulated illumination light toward the projection lens. The polarization separation device (15) is disposed between the light valve and the projection lens. The polarization separation device separates entering light into a first polarized component and a second polarized component, and outputs the first polarized component and the second polarized component in respective directions that are different from each other. The detection optical system includes an imaging device (13) and a reduction optical system (14). The imaging device is disposed in a position that is optically conjugate with a position of the light valve. The reduction optical system is disposed between the imaging device and the polarization separation device. The imaging device receives, via the projection lens and the polarization separation device, light based on detection invisible light. A transmittance adjuster is provided between the polarization separation device and the imaging device. The transmittance adjuster adjusts transmittance of at least part of a bundle of passing light rays derived from the invisible light.

The lighting device (11) has at least one light generation device (12) for generating a primary light (P), a first luminophore (16) for converting the wavelength of the primary light (P) to a first secondary light (S1), and a second luminophore (20) for converting the wavelength of the primary light (P) to a second secondary light (S2), the first luminophore (16) being located on a movable support (15), which is provided in order to alternatively move the first luminophore into and out of a beam path of the primary light (P), and the second luminophore being located on a stationary support (21). The invention also relates to a method for generating wavelength-converted secondary light from primary light with alternating irradiation of a first luminophore located on a movable support and of a second luminophore located on a stationary support by the primary light. The invention can be used, for example, as a projection device for film and video projection, in endoscopy, for lighting effects in the entertainment industry, for medical irradiations as well as in the automobile industry, in particular as a head light for motor vehicles.

An optical device includes a first polarization selective reflector; a second polarization selective reflector positioned relative to the first polarization selective reflector so that the first polarization selective reflector directs first light having a first nonplanar polarization toward the second polarization selective reflector and the second polarization selective reflector directs at least a portion of the first light toward the first polarization selective reflector as second light. The optical device includes a first reflector positioned relative to the first polarization selective reflector so that the first polarization selective reflector directs at least a portion of the second light having a second nonplanar polarization toward the first reflector as third light.

An illumination device with projector includes a projector having a projection optical system, a projector holding section configured to hold the projector, a stand part to be coupled to the projector holding section, and a shade which is configured to cover a periphery of the projector holding section, and is provided with a projection opening through which projection light emitted from the projector is transmitted. The projector holding section is provided with an angle adjustment mechanism for changing a tilt angle of the projector centering on an end portion at an exit side of the projector.

The displaying apparatus unit according to the present invention includes a first holder configured to hold a displaying element, a second holder configured to hold an optical operating plate which operates on light from the displaying element, a first dustproof cover member disposed between the first holder and the second holder, and configured to cover a whole side surface of the displaying element, and a second dustproof cover member disposed between the first dustproof cover member and the second holder, wherein the first dustproof cover member is in contact with the first holder, the second dustproof cover member is in contact with the second holder, the first dustproof cover member and the second dustproof cover member are in contact with each other, and the first dustproof cover member has a hardness higher than that of the second dustproof cover member.

An illumination device comprises a light source that includes a solid-state light source whose peak wavelength is set in the red wavelength band, a light source that includes a solid-state light source whose peak wavelength is set in the green wavelength band, a light source that includes a solid-state light source whose peak wavelength is set in the blue wavelength band, and a color synthesis optical element that combines P-polarized colored light incident from one light source and S-polarized colored light incident from the other two light sources. One light source includes at least one solid-state light source whose peak wavelength is set in the wavelength band of the color corresponding to one of the other light sources.

An image display system includes a projector, a transparent screen, and a polarization adjuster. The projector projects image light. The transparent screen diffuses the image light that has been projected, to display an image. The polarization adjuster adjusts the image light that is to enter the transparent screen so that the image light is p-polarized.

A light source apparatus according to the present disclosure includes a light source section, a first polarization separator that transmits in a first polarization component of the first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a first wavelength converter that converts the wavelength of the first polarization component into second light, and a second wavelength converter that is disposed in a position shifted in a fifth direction from a placement plane where the first polarization separator and the second polarization separator are placed, converts the wavelength of the excitation light into third light, and the second polarization separator transmits the first polarization component of the second light and reflects the second polarization component of the second light.