Plane light source unit and light guide used therein
First Claim
1. A plane light source unit comprising:
- a tubular light source; and
a light guide having a light emitting surface and a reflecting surface in addition to a light incident face placed near said tubular light source to receive light emitted from said tubular light source,wherein said light guide has a plurality of projections arrayed on the light emitting surface to extend parallel to each other along a longitudinal direction of said tubular light source so as to cause the light incident from the light incident face to emerge from the light emitting surface, and a height of each of said projections increases from a central portion to two end portions in the longitudinal direction of said tubular light source.
2 Assignments
0 Petitions
Accused Products
Abstract
A plane light source unit includes a tubular light source, and a light guide. The light guide has a light emitting surface and a reflecting surface in addition to a light incident face placed near the tubular light source to receive light emitted from the tubular light source. The light guide has a plurality of projections or grooves arrayed on the light emitting surface to extend parallel to each other along a longitudinal direction of the tubular light source so as to cause the light incident from the light incident face to emerge from the light emitting surface. The height or depth of each of the projections or grooves increases from the central portion to the two end portions in the longitudinal direction of the tubular light source.
207 Citations
48 Claims
-
1. A plane light source unit comprising:
-
a tubular light source; and a light guide having a light emitting surface and a reflecting surface in addition to a light incident face placed near said tubular light source to receive light emitted from said tubular light source, wherein said light guide has a plurality of projections arrayed on the light emitting surface to extend parallel to each other along a longitudinal direction of said tubular light source so as to cause the light incident from the light incident face to emerge from the light emitting surface, and a height of each of said projections increases from a central portion to two end portions in the longitudinal direction of said tubular light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A plane light source unit comprising:
-
a tubular light source; and a light guide having a light emitting surface and a reflecting surface in addition to a light incident face placed near said tubular light source to receive light emitted from said tubular light source, wherein said light guide has a plurality of grooves arrayed in the light emitting surface and to extend parallel to each other along a longitudinal direction of said tubular light source so as to cause the light incident from the light incident face to emerge from the light emitting surface, and a depth of each of said grooves increases from a central portion to two end portions in the longitudinal direction of said tubular light source. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A light guide used for a plane light source unit, comprising:
-
an incident face which is one end face of said light guide and placed near a tubular light source to receive light emitted from the tubular light source; a reflecting surface which is one major surface of said light guide and substantially perpendicular to the light incident face; and a light emitting surface which is the other major surface of said light guide on an opposite side to said reflecting surface and substantially perpendicular to said light incident face, wherein a plurality of projections are arrayed on the light emitting surface to extend parallel to each other along a longitudinal direction of said tubular light source so as to cause the light incident from the light incident face to emerge from the light emitting surface, and a height of each of said projections increases from a central portion to two end portions in the longitudinal direction of said tubular light source. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
-
-
46. A light guide used for a plane light source unit, comprising:
-
an incident face which is one end face of said light guide and placed near a tubular light source to receive light emitted from the tubular light source; a reflecting surface which is one major surface of said light guide and substantially perpendicular to the light incident face; and a light emitting surface which is the other major surface of said light guide on an opposite side to said reflecting surface and substantially perpendicular to said light incident face, wherein a plurality of grooves are arrayed in the light emitting surface to extend parallel to each other along a longitudinal direction of said tubular light source so as to cause the light incident from the light incident face to emerge from the light emitting surface, and a depth of each of said grooves increases from a central portion to two end portions in the longitudinal direction of said tubular light source. - View Dependent Claims (47, 48)
-
Specification