Abstract: It is an object to provide a technique capable of enhancing evenness of a planar light. A planar light source device includes a light source, a holding substrate, a light distribution control element having a light incident surface and a light outputting surface, a reflection part reflecting the light which has been reflected in an inner side of the light distribution control element toward the side of the display surface, and a case which houses the light source, the holding substrate, the light distribution control element, and the reflection part. A part opposite to the side of the display surface, in relation to at least the light distribution control element in a region between the light distribution control element and an inner wall of the case, is covered by the reflection part.

Abstract: A surface light source device includes: a source to emit light including first rays and second rays emitted in mutually perpendicular directions; and an element to change a light distribution of the light. The element includes: an incident surface to receive the first and second rays; a layer including a material for diffusing the first and second rays; a first surface through which an optical axis of the element passes, part of the first rays reaching the first surface after passing through the layer without being diffused by the material; a second surface extending from the first surface toward the source, part of the second rays reaching the second surface after passing through the layer without being diffused by the material; and a reflecting surface facing the first surface, part of the first rays being reflected by the reflecting surface toward the second surface after reflected by the first surface.

Abstract: A planar light source apparatus according to the present invention includes a light source, a holding substrate that holds the light source at a main surface, and a light-distribution control element that is disposed at the main surface of the holding substrate so as to cover the light source, and changes light distribution of light rays emitted from the light source. The light-distribution control element includes a diffusion part that is provided at at least at one surface of a plurality of surfaces that structure the outer shape of the light-distribution control element. The at least one surface where the diffusion part is provided is a surface different from an installation surface capable of abutting on the main surface of the holding substrate.

Abstract: Provided is a surface light source apparatus that improves homogeneity of surface illumination light, using both light rays passing through a light emitting surface of a light-distribution control element and the reflected light rays. A surface light source apparatus according to the present invention includes: a light source; a holding substrate having a main surface on which the light source is held; a light-distribution control element disposed on the main surface of the holding substrate to cover the light source, the light-distribution control element changing distribution of light emitted from the light source; and a diffuser that diffuses light emitted from the light-distribution control element. The light-distribution control element includes a diffusion part disposed at an installation surface that can abut the main surface of the holding substrate.

Abstract: A surface light source device includes a laser beam source, a laser beam guide rod for converting a laser beam into first linear light, an LED light source, an LED light guide rod for converting LED light into second linear light extended in the same direction as the first linear light, a reflecting bar for reflecting the first linear light and the second linear light, and a light reflecting portion formed in a box shape and having an opening portion with an emission side opened and a reflecting surface on an inside of the box shape. The first linear light and the second linear light are reflected by the reflecting bar and the reflecting surface, and are emitted from the opening portion.

Abstract: A planar light source apparatus according to the present invention includes a light source, a holding substrate that holds the light source at a main surface, and a light-distribution control element that is disposed at the main surface of the holding substrate so as to cover the light source, and changes light distribution of light rays emitted from the light source. The light-distribution control element includes a diffusion part that is provided at at least at one surface of a plurality of surfaces that structure the outer shape of the light-distribution control element. The at least one surface where the diffusion part is provided is a surface different from an installation surface capable of abutting on the main surface of the holding substrate.

Abstract: Provided is a surface light source apparatus that improves homogeneity of surface illumination light, using both light rays passing through a light emitting surface of a light-distribution control element and the reflected light rays. A surface light source apparatus according to the present invention includes: a light source; a holding substrate having a main surface on which the light source is held; a light-distribution control element disposed on the main surface of the holding substrate to cover the light source, the light-distribution control element changing distribution of light emitted from the light source; and a diffuser that diffuses light emitted from the light-distribution control element. The light-distribution control element includes a diffusion part disposed at an installation surface that can abut the main surface of the holding substrate.

Abstract: It is an object to provide a technique capable of enhancing evenness of a planar light. A planar light source device includes a light source, a holding substrate, a light distribution control element having a light incident surface and a light outputting surface, a reflection part reflecting the light which has been reflected in an inner side of the light distribution control element toward the side of the display surface, and a case which houses the light source, the holding substrate, the light distribution control element, and the reflection part. A part opposite to the side of the display surface, in relation to at least the light distribution control element in a region between the light distribution control element and an inner wall of the case, is covered by the reflection part.

Abstract: A surface light source device includes a plurality of LEDs for emitting a plurality of light having different colors, and a light guide body for mixing the colors of the plurality of light and emitting light having colors mixed. The light guide body includes a light incident portion for causing the plurality of light to be individually incident, and a light emitting portion provided beside the light incident portion and changing propagation angles of the plurality of light which is incident from the light incident portion and propagated into the light guide body to mix colors, thereby controlling a quantity of light emission from the light guide body and a light emitting position.

Abstract: A light source device has a first monochromatic light source group, a second monochromatic light source group, a polarization selection and wavelength selection element, a first phosphor layer, and a second phosphor layer. The first monochromatic light source group outputs first polarized light having a fixed polarization direction. The second monochromatic light source group outputs second polarized light having a fixed polarization direction. The first phosphor layer emits light in a first wavelength band. The second phosphor layer emits light in a second wavelength band. The polarization and wavelength selection element directs the first polarized light onto the first phosphor layer by transmitting the first polarized light and directs the second polarized light onto the second phosphor layer by reflecting the second polarized light, reflects the light in the first wavelength band and transmits the light in the second wavelength band.

Abstract: A surface light source device includes a laser beam source, a laser beam guide rod for converting a laser beam into first linear light, an LED light source, an LED light guide rod for converting LED light into second linear light, a reflecting bar having a reflecting region for reflecting part of the first linear light and the second linear light and a transmitting region for transmitting a residual part of the first linear light and the second linear light, and a light reflecting portion formed in a box shape and having an opening portion with an emission side opened and a reflecting surface on an inside of the box shape. In the first linear light and the second linear light, part thereof is reflected by the reflecting region and the reflecting surface and a residual part is transmitted through the transmitting region and is emitted from the opening portion.

Abstract: A projection device includes: first light sources each emitting a first light; a collimator lens that converts the first lights into parallel light beams; a condensing optical system that receives the parallel light beams and emits concentrated light beams; and an optical element having an incident surface through which the concentrated light beams enters the optical element. The condensing optical system is configured so that when a light beam parallel to an optical axis of the condensing optical system is incident on the condensing optical system, the light beam is concentrated at a position on the axis on the incident surface. The parallel light beams are incident at different positions of the condensing optical system while approaching the axis. Emitting positions of the light beams on the condensing optical system and incident positions of the light beams on the incident surface are opposite each other with respect to the axis.

Abstract: A light source device includes a plurality of light sources with different polarizations. A combined wavelength band of the light of a first polarization and second polarization is a first wavelength band. A combined wavelength band of a third polarization and fourth polarization is a second wavelength band. A plurality of selective transmission elements transmits one or more combined light of one or more polarizations and reflects one or more light of one or more polarizations. Thus, the light of the first polarization, the light of the second polarization and the light of the third polarization passing through a third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.

Abstract: A surface light source device includes a laser beam source, a laser beam guide rod for converting a laser beam into first linear light, an LED light source, an LED light guide rod for converting LED light into second linear light, a reflecting bar having a reflecting region for reflecting part of the first linear light and the second linear light and a transmitting region for transmitting a residual part of the first linear light and the second linear light, and a light reflecting portion formed in a box shape and having an opening portion with an emission side opened and a reflecting surface on an inside of the box shape. In the first linear light and the second linear light, part thereof is reflected by the reflecting region and the reflecting surface and a residual part is transmitted through the transmitting region and is emitted from the opening portion.

Abstract: A surface light source device includes a laser beam source, a laser beam guide rod for converting a laser beam into first linear light, an LED light source, an LED light guide rod for converting LED light into second linear light extended in the same direction as the first linear light, a reflecting bar for reflecting the first linear light and the second linear light, and a light reflecting portion formed in a box shape and having an opening portion with an emission side opened and a reflecting surface on an inside of the box shape. The first linear light and the second linear light are reflected by the reflecting bar and the reflecting surface, and are emitted from the opening portion.

Abstract: A surface light source device includes a plurality of LEDs for emitting a plurality of light having different colors, and a light guide body for mixing the colors of the plurality of light and emitting light having colors mixed. The light guide body includes a light incident portion for causing the plurality of light to be individually incident, and a light emitting portion provided beside the light incident portion and changing propagation angles of the plurality of light which is incident from the light incident portion and propagated into the light guide body to mix colors, thereby controlling a quantity of light emission from the light guide body and a light emitting position.

Abstract: A projection device includes: first light sources each emitting a first light; a collimator lens that converts the first lights into parallel light beams; a condensing optical system that receives the parallel light beams and emits concentrated light beams; and an optical element having an incident surface through which the concentrated light beams enters the optical element. The condensing optical system is configured so that when a light beam parallel to an optical axis of the condensing optical system is incident on the condensing optical system, the light beam is concentrated at a position on the axis on the incident surface. The parallel light beams are incident at different positions of the condensing optical system while approaching the axis. Emitting positions of the light beams on the condensing optical system and incident positions of the light beams on the incident surface are opposite each other with respect to the axis.

Abstract: To improve light utilization efficiency, a light source device (4) has a first monochromatic light source group (1000a), a second monochromatic light source group (1000b), a polarization selection and wavelength selection element (14), a first phosphor layer (16a), and a second phosphor layer (16b). The first monochromatic light source group (1000a) outputs first polarized light having a fixed polarization direction. The second monochromatic light source group (1000b) outputs second polarized light having a fixed polarization direction. The first phosphor layer emits light in a first wavelength band. The second phosphor layer emits light in a second wavelength band.