Abstract: A powder mixture of the present invention is characterized in that it comprises: an iron powder or an iron-based alloy powder, wherein a graphite powder is adhered to a surface of the iron powder or the iron-based alloy powder by a binding agent containing a polyolefin wax; and a negatively-charged powder to be mixed with the iron powder or the iron-based alloy powder, and consisting of an iron powder and/or an iron-based alloy powder treated for negatively charging. This enables keeping the good adhering property of a graphite powder in a mixed powder and high flowability as a mixture of the raw material powder.

Abstract: A back light device realizing improvement in hotspots and bright line in the region of light incidence and of darkness arising in between light sources is provided by forming the reflective surface of the reflector as a structured face comprising an iteration of prism elements of trapezoidal section.

Abstract: A light guide plate includes: a plate surrounded by two main surfaces and a plurality of end surfaces connecting the main surfaces, one of the end surfaces designated as an entrance surface, one of the main surfaces designated as a reflection surface; a first reflection element provided in a first region of the reflection surface separated from the entrance surface, and configured to reflect a light incident from the entrance surface in a first angle with respect to the reflection surface; and a second reflection element provided in a second region of the reflection surface between the entrance surface and the first region, and configured to reflect the light in a second angle different from the first angle with respect to the reflection surface.

Abstract: A surface light source device is disclosed that provides greater light condensation in the frontal direction and higher luminance in comparison to a conventional surface light source device. Disclosed is a surface light source device providing a light source, a light guide having at least one of the side surfaces thereof as an incident surface and an outgoing surface substantially perpendicular to the incident surface, and at least two prism sheets, in which the surfaces formed by the prisms of the prism sheets are arranged so as to face upward, moreover the surfaces of the sides opposing the surfaces formed by the prisms of the prism sheets are arranged substantially parallel to the outgoing surface of the light guide.

Abstract: An optical film 10 has a transparent base film 11 made of polyethylene terephthalate (PET), a prism made of photo-curing resin such as acryl modified epoxy on an incident surface 12 that is one face of the base film 11, and a hologram similarly made of photo-curing resin on an exit surface 13 opposing the incident surface 12. The prism has grooves or ridges each having a substantially triangular cross section to totally reflect incident light so as to bend the light into a direction perpendicular to the exit surface 13. The hologram anisotropically diffuses light exiting from the exit surface 13, to improve brightness.

Abstract: A backlight unit includes: light guide plate surrounded by main surfaces and end surfaces, one end surface facing a light source designated as entrance surface, one main surface designated as emitting surface; first prism sheet provided above the light guide plate, having first prism columns on a top surface and second prism columns on a bottom surface, each first prism column has first ridge line parallel or perpendicular to the entrance surface, each second prism column has second ridge line extending in a different direction from the first ridge line; second prism sheet provided above the first prism sheet, having third prism columns abutting each other on a top surface, each third prism column has third ridge line extending in a direction different from the first and second ridge lines; and reflection sheet facing the light guide plate below the light guide plate.

Abstract: A backlight unit includes: light guide plate surrounded by main surfaces and end surfaces, one end surface facing a light source designated as entrance surface, one main surface designated as emitting surface; first prism sheet provided above the light guide plate, having first prism columns on a top surface and second prism columns on a bottom surface, each first prism column has first ridge line parallel or perpendicular to the entrance surface, each second prism column has second ridge line extending in a different direction from the first ridge line; second prism sheet provided above the first prism sheet, having third prism columns abutting each other on a top surface, each third prism column has third ridge line extending in a direction different from the first and second ridge lines; and reflection sheet facing the light guide plate below the light guide plate.

Abstract: A backlight device with improved efficiency in the utilization of light and a liquid crystal display device providing this backlight device are provided, the backlight device comprising at least a light source 2, a light guide plate 1 and a reflector 10, in which the light guide plate 1 further provides an entry face 5 into which light from the light source is incident, a lower face 4 substantially perpendicular to the entry face 5 and that opposes the reflector 10, and an upper face 3 that opposes the lower face 4, and reflective elements 6 that are capable of reflecting such that light is emitted from the lower face 4 toward the reflector 10 are disposed on the upper face 3 of the light guide plate.

Abstract: A light guide plate includes: a plate surrounded by two main surfaces and a plurality of end surfaces connecting the main surfaces, one of the end surfaces designated as an entrance surface, one of the main surfaces designated as a reflection surface; a first reflection element provided in a first region of the reflection surface separated from the entrance surface, and configured to reflect a light incident from the entrance surface in a first angle with respect to the reflection surface; and a second reflection element provided in a second region of the reflection surface between the entrance surface and the first region, and configured to reflect the light in a second angle different from the first angle with respect to the reflection surface.

Abstract: A back light device realizing improvement in hotspots and bright line in the region of light incidence and of darkness arising in between light sources is provided by forming the reflective surface of the reflector as a structured face comprising an iteration of prism elements of trapezoidal section.

Abstract: A backlight device with improved efficiency in the utilization of light and a liquid crystal display device providing this backlight device are provided, the backlight device comprising at least a light source 2, a light guide plate 1 and a reflector 10, in which the light guide plate 1 further provides an entry face 5 into which light from the light source is incident, a lower face 4 substantially perpendicular to the entry face 5 and that opposes the reflector 10, and an upper face 3 that opposes the lower face 4, and reflective elements 6 that are capable of reflecting such that light is emitted from the lower face 4 toward the reflector 10 are disposed on the upper face 3 of the light guide plate.

Abstract: An optical film 10 has a transparent base film 11 made of polyethylene terephthalate (PET), a prism made of photo-curing resin such as acryl modified epoxy on an incident surface 12 that is one face of the base film 11, and a hologram similarly made of photo-curing resin on an exit surface 13 opposing the incident surface 12. The prism has grooves or ridges each having a substantially triangular cross section to totally reflect incident light so as to bend the light into a direction perpendicular to the exit surface 13. The hologram anisotropically diffuses light exiting from the exit surface 13, to improve brightness.