Planar light source system and light deflecting device therefor
First Claim
1. A planar light source system comprising:
- at least one primary light source of substantially point-shaped light source;
a light guide having a light incident face on which light emitted from said primary light source is incident, guiding the incident light and having a light emission face from which the incident light is emitted; and
a light deflecting device for controlling a direction of light emission from said light guide, wherein said primary light source is disposed at a corner portion or an end surface of said light guide, and many substantially arc-shaped elongated lenses are formed in parallel to each other on at least one surface of said light deflecting device so as to surround said primary light source, wherein said light deflecting device has a light incident surface which confronts said light guide, and said substantially arc-shaped elongated lenses are formed on at least the light incident surface, wherein each of said elongated lenses formed on said light deflecting device comprises an elongated prism having two prism faces, and light incident through at least one prism face is internally reflected and emitted from a light emission surface in a desired direction, and wherein each elongated prism of said light deflecting device comprises two prism faces, one prism face being farther from said primary light source said another prism face being nearer to said primary light source, and an intersecting angle between said prism face farther from said primary light source and a reference plane of said light deflecting device is equal to 40 to 80 degrees.
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Accused Products
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).
140 Citations
23 Claims
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1. A planar light source system comprising:
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at least one primary light source of substantially point-shaped light source;
a light guide having a light incident face on which light emitted from said primary light source is incident, guiding the incident light and having a light emission face from which the incident light is emitted; and
a light deflecting device for controlling a direction of light emission from said light guide, wherein said primary light source is disposed at a corner portion or an end surface of said light guide, and many substantially arc-shaped elongated lenses are formed in parallel to each other on at least one surface of said light deflecting device so as to surround said primary light source, wherein said light deflecting device has a light incident surface which confronts said light guide, and said substantially arc-shaped elongated lenses are formed on at least the light incident surface, wherein each of said elongated lenses formed on said light deflecting device comprises an elongated prism having two prism faces, and light incident through at least one prism face is internally reflected and emitted from a light emission surface in a desired direction, and wherein each elongated prism of said light deflecting device comprises two prism faces, one prism face being farther from said primary light source said another prism face being nearer to said primary light source, and an intersecting angle between said prism face farther from said primary light source and a reference plane of said light deflecting device is equal to 40 to 80 degrees. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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2. A planar light source system comprising:
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at least one primary light source of substantially point-shaped light source;
a light guide having a light incident face on which light emitted from said primary light source is incident, guiding the incident light and having a light emission face from which the incident light is emitted; and
a light deflecting device for controlling a direction of light emission from said light guide, wherein said primary light source is disposed at a corner portion or an end surface of said light guide, and many substantially arc-shaped elongated lenses are formed in parallel to each other on at least one surface of said light deflecting device so as to surround said primary light source, wherein said light deflecting device has a light incident surface which confronts said light guide, and said substantially arc-shaped elongated lenses are armed on at least the light incident surface, and wherein at least a part of at least one prism face constituting each elongated prism of said light deflecting device is designed to have a convex or concave curved-surface. - View Dependent Claims (3, 4, 5)
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6. A planar light source system comprising:
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at least one primary light source of substantially point-shaped light source;
a light guide having a light incident face on which light emitted from said primary light source is incident, guiding the incident light and having a light emission face from which the incident light is emitted; and
a light deflecting device for controlling a direction of light emission from said light guide, wherein said primary light source is disposed at a corner portion or an end surface of said light guide, and many substantially arc-shaped elongated lenses are formed in parallel to each other on at least one surface of said light deflecting device so as to surround said primary light source, wherein said light deflecting device has elongated lenses formed on at least a light emission surface at the opposite side to a light incident surface confronting said light guide, wherein said light deflecting device refracts light incident through the light incident surface and emits the light from the light emission surface in a desired direction, and wherein each elongated prism of said light deflecting device comprises two prism faces, one prism face being farther from said primary light source and another face being nearer to said primary light source, and an intersecting angle between said prism face farther from said primary light source and a reference plane of said light deflecting device is equal to 35 to 55 degrees while an intersecting angle between the prism face nearer to said primary light source and the reference plane of said light deflecting device is equal to 35 to 55 degrees.
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18. A light deflecting device for a planar light source system, wherein said light deflecting device is designed in a rectangular shape and has many elongated lenses arranged in parallel to each other on at least one surface thereof, said elongated lenses extend substantially arcuately with a corner portion or a one point of an end surface of said light deflecting device positioned substantially at the center of an arc,
wherein said elongated lenses are formed on at least a light incident surface thereof, wherein each of said elongated lenses comprises an elongated prism having two prism faces, and light incident through at least one prism face is internally reflected and emitted from a light emission surface in a desired direction, and wherein each of said elongated prisms comprises two prism faces, one of which is located at a farther position from the center of the arc and the other of which is located at a nearer position to the center of the arc, and an intersecting angle between said prism face located at the farther position from the center of the arc and a reference plan of said light deflecting device is equal to 40 to 80 degrees.
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23. A light deflecting device for a planar light source system, wherein said light deflecting device is designed in a rectangular shape and has many elongated lenses arranged in parallel to each other on at least one surface thereof said elongated lenses extend substantially arcuately with a corner portion or a one point of an end surface of said light deflecting device positioned substantially at the center of an arc,
wherein said elongated lenses are formed on at least a light emission surface at the opposite side to a light incident surface, wherein light incident through the light incident surface is refracted and emitted in a desired direction from the light emission surface, and wherein each of said elongated prisms comprises two prism faces, one prism face being farther from the center of the arc and the other face being nearer to the center of the arc, and an intersecting angle between said prism face farther from the center of the arc and a reference plane of said light deflecting device is equal to 35 to 55 degrees while an intersecting angle between the prism face nearer to the center of the arc and the reference plane of said light deflecting device is equal to 35 to 55 degrees.
Specification