Abstract: A surface light source apparatus includes a primary light source (1), an optical guide (3) for guiding light emitted from the primary light source and having a light incoming surface (31) and a light outgoing surface (32), a light deflection element (4) arranged adjacent to the light outgoing surface of the optical guide and having a light incoming surface (41) and a light outgoing surface (42), and a light diffusion element (6) arranged adjacent to the light outgoing surface of the light deflection element. The light incoming surface (41) of the light deflection element has a plurality of prism strings arranged substantially parallel to each other and each having two prism surfaces. At least one of the prism surfaces of these prism strings has a prism surface consisting of at least two planes having different inclination angles. As the plane approaches the light going surface, the inclination becomes larger.

Abstract: A planar light source system having an LED (1) serving as a primary light source of substantially point-shaped light source, a light guide (2) having a light incident face on which light emitted from the LED (1) is incident and a light emission face (4) from which light guided through the light guide (2) is emitted, a light deflecting device (3) for controlling the direction of the emission light from the light guide (2), and a reflection sheet (6). LED (1) is disposed at a corner portion of the light guide (2), and many elongated prisms (5) are arranged substantially arcuately in parallel to each other on the light incident surface (14) of the light deflecting device (3) so as to surround LED (1).

Abstract: A light source device, comprising a light guide (3) having two light incident surfaces opposed to each other for receiving incident light radiated from a primary light source and a light outgoing surface (33) for emitting the incident light and a light deflection element (4) disposed adjacent to the light emitting surface side of the light guide, the light deflection element (4) further comprising a light receiving surface (41) for receiving incident light and a light emitting surface (42) positioned on the opposite side thereof and emitting the incident light, wherein a plurality of elongated prisms formed of two prism faces are disposed on the light receiving surface (41) generally parallel with each other, the prism surfaces are formed of at least two faces (46, 47, 48, 49, 50, 51) with different inclination angles, and the inclination angles are larger for the faces positioned nearer the light emitting surface (42).

Abstract: A surface light source apparatus includes a primary light source (1), an optical guide (3) for guiding light emitted from the primary light source and having a light incoming surface (31) and a light outgoing surface (32), a light deflection element (4) arranged adjacent to the light outgoing surface of the optical guide and having a light incoming surface (41) and a light outgoing surface (42), and a light diffusion element (6) arranged adjacent to the light outgoing surface of the light deflection element. The light incoming surface (41) of the light deflection element has a plurality of prism strings arranged substantially parallel to each other and each having two prism surfaces. At least one of the prism surfaces of these prism strings has a prism surface consisting of at least two planes having different inclination angles. As the plane approaches the light going surface, the inclination becomes larger.

Abstract: A surface light source apparatus includes a primary light source (1), an optical guide (3) for guiding light emitted from the primary light source and having a light incoming surface (31) and a light outgoing surface (32), a light deflection element (4) arranged adjacent to the light outgoing surface of the optical guide and having a light incoming surface (41) and a light outgoing surface (42), and a light diffusion element (6) arranged adjacent to the light outgoing surface of the light deflection element. The light incoming surface (41) of the light deflection element has a plurality of prism strings arranged substantially parallel to each other and each having two prism surfaces. At least one of the prism surfaces of these prism strings has a prism surface consisting of at least two planes having different inclination angles. As the plane approaches the light going surface, the inclination becomes larger.

Abstract: A light source device comprising at least a primary light source (1), a light guide (3) guiding light beamed from the primary light source and having a light incident surface (31) and a light outgoing surface (33), an optical deflector (4) disposed adjacent to the light guide's light outgoing surface and having a light incident surface (41) and a light outgoing surface (42), and a light diffuser (6) disposed adjacent to the optical deflector's light outgoing surface and having a light incident surface (61) and a light out going surface (62), wherein the optical deflector's light incident surface is formed with a plurality of rows of prisms arranged in parallel to each other, and the light diffuser has the full width half maximum of an outgoing light intensity of 1–13 degrees when parallel rays of light are incident, whereby providing a light source device excellent in light utilization efficiency of a primary light source, and also excellent in viewing angle characteristics and quality as an image forming ill

Abstract: A light source device comprising at least a primary light source (1), a light guide (3) guiding light beamed from the primary light source and having a light incident surface (31) and a light outgoing surface (33), an optical deflector (4) disposed adjacent to the light guide's light outgoing surface and having a light incident surface (41) and a light outgoing surface (42), and a light diffuser (6) disposed adjacent to the optical deflector's light outgoing surface and having a light incident surface (61) and a light out going surface (62), wherein the optical deflector's light incident surface is formed with a plurality of rows of prisms arranged in parallel to each other, and the light diffuser has the full width half maximum of an outgoing light intensity of 1-13 degrees when parallel rays of light are incident, whereby providing a light source device excellent in light utilization efficiency of a primary light source, and also excellent in viewing angle characteristics and quality as an image forming ill

Abstract: A light source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle ? of 50 to 70° arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device.

Abstract: A light-source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle ? of 50 to 70° arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device.

Abstract: A light source device, comprising a light guide (3) having two light incident surfaces opposed to each other for receiving incident light radiated from a primary light source and a light outgoing surface (33) for emitting the incident light and a light deflection element (4) disposed adjacent to the light emitting surface side of the light guide, the light deflection element (4) further comprising a light receiving surface (41) for receiving incident light and a light emitting surface (42) positioned on the opposite side thereof and emitting the incident light, wherein a plurality of elongated prisms formed of two prism faces are disposed on the light receiving surface (41) generally parallel with each other, the prism surfaces are formed of at least two faces (46, 47, 48, 49, 50, 51) with different inclination angles, the inclination angles are larger for the faces positioned nearer the light emitting surface (42), and a difference between the inclination angle of the face (46, 49) nearest the light emitting

Abstract: A light source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle ? of 50 to 70° arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device.

Abstract: A surface light source apparatus includes a primary light source (1), an optical guide (3) for guiding light emitted from the primary light source and having a light incoming surface (31) and a light outgoing surface (32), a light deflection element (4) arranged adjacent to the light outgoing surface of the optical guide and having a light incoming surface (41) and a light outgoing surface (42), and a light diffusion element (6) arranged adjacent to the light outgoing surface of the light deflection element. The light incoming surface (41) of the light deflection element has a plurality of prism strings arranged substantially parallel to each other and each having two prism surfaces. At least one of the prism surfaces of these prism strings has a prism surface consisting of at least two planes having different inclination angles. As the plane approaches the light outgoing surface, the inclination becomes larger.

Abstract: A light-source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle ? of 50 to 70° arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device.

Abstract: A light source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle ? of 50 to 70° arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device.

Abstract: A light source device comprising at least a primary light source (1), a light guide (3) guiding light beamed from the primary light source and having a light incident surface (31) and a light outgoing surface (33), an optical deflector (4) disposed adjacent to the light guide's light outgoing surface and having a light incident surface (41) and a light outgoing surface (42), and a light diffuser (6) disposed adjacent to the optical deflector's light outgoing surface and having a light incident surface (61) and a light out going surface (62), wherein the optical deflector's light incident surface is formed with a plurality of rows of prisms arranged in parallel to each other, and the light diffuser has the full width half maximum of an outgoing light intensity of 1-13 degrees when parallel rays of light are incident, whereby providing a light source device excellent in light utilization efficiency of a primary light source, and also excellent in viewing angle characteristics and quality as an image forming ill

Abstract: A planar light source system having an LED (1) serving as a primary light source of substantially point-shaped light source, a light guide (2) having a light incident face on which light emitted from the LED (1) is incident and a light emission face (4) from which light guided through the light guide (2) is emitted, a light deflecting device (3) for controlling the direction of the emission light from the light guide (2), and a reflection sheet (6). LED (1) is disposed at a corner portion of the light guide (2), and many elongated prisms (5) are arranged substantially arcuately in parallel to each other on the light incident surface (14) of the light deflecting device (3) so as to surround LED (1).

Abstract: A planar light source system having an LED (1) serving as a primary light source of substantially point-shaped light source, a light guide (2) having a light incident face on which light emitted from the LED (1) is incident and a light emission face (4) from which light guided through the light guide (2) is emitted, a light deflecting device (3) for controlling the direction of the emission light from the light guide (2), and a reflection sheet (6). LED (1) is disposed at a corner portion of the light guide (2), and many elongated prisms (5) are arranged substantially arcuately in parallel to each other on the light incident surface (14) of the light deflecting device (3) so as to surround LED (1).

Abstract: A planar light source system having an LED (1) serving as a primary light source of substantially point-shaped light source, a light guide (2) having a light incident face on which light emitted from the LED (1) is incident and a light emission face (4) from which light guided through the light guide (2) is emitted, a light deflecting device (3) for controlling the direction of the emission light from the light guide (2), and a reflection sheet (6). LED (1) is disposed at a corner portion of the light guide (2), and many elongated prisms (5) are arranged substantially arcuately in parallel to each other on the light incident surface (14) of the light deflecting device (3) so as to surround LED (1).

Abstract: A light source device having a light guide (3) for guiding light emitted from a primary light source and emitting light obliquely from a light emission face (33) thereof, and a light deflecting device (4) disposed so as to be adjacent to the light emission face. Plural elongated prisms are arranged in parallel to one another at a light incident surface (41) of the light deflecting device. Virtual elongated prisms (I) each having a vertical angle &thgr; of 50 to 70° arranged in the same arrangement pitch as the elongated prisms are assumed so that the peak emission light in the light emission distribution of light emitted from the light emission face is incident on one virtual prism face of the virtual elongated prism, internally totally reflected by another virtual prism face and then emitted in a desired direction from a light emission surface (42) of the light deflecting device.

Abstract: A surface light source device, comprising a light source (2); a light conductor (1) which has a light incident face (11) on at least one side end surface thereof which confronts the light source (2), and a light emitting face (12) on one surface thereof which is substantially perpendicular to the light incident face (11); and a light angle varying sheet (3) which is disposed at a side of the light emitting face (12) of the light conductor (1), wherein at least one of the light emitting face (12) and a back surface (13) of the light conductor (1) comprises a minute structure having an average slant angle of 0.5 to 7.5 degrees. The light angle varying sheet (3) may comprise a prism sheet having a plurality of prisms (31) which are formed parallel to one another on at least one surface thereof.