Light emitting device and optical element
First Claim
1. A light emitting device comprising:
- a rod-shaped light guide;
a light source which inputs light to the light guide; and
a prism part which changes the direction of light input from the length-wise end of the light guide, and emits redirected light from a light exit surface that is disposed opposite the prism part;
whereina parallel light forming body, which makes light emitted from the light source toward the light guide nearly parallel light, is formed at the length-wise end of the light guide;
a light emitting surface of the light source is shifted in a direction perpendicular to a center axis of the light guide from the center axis of the light guide and the optical axis of the parallel light forming body toward the side closer to the prism part, or toward the side away from the prism part, for the nearly parallel light to be directed to the light exit surface of the light guide or to the prism part;
the light emitting surface is perpendicular to the center axis of the light guide.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed are a light emitting device and a light emitting element that can decrease fabrication difficulties, while improving lighting efficiency and controlling the distribution of intensity that occurs in the emitted light. A light emitting device comprises a rod-shaped light guide, an LED that inputs light to the light guide, and a prism that changes the direction of light input from the lengthwise end of the light guide, and emits redirected light from a light exit surface that is disposed opposite the prism. The light emitting device is constituted so that an input lens is formed at the lengthwise end of the light guide as a parallel light forming body to make light exiting from the LED toward the light guide nearly parallel light, and the LED is shifted from the center axis of the light guide toward the side closer to the prism, or toward the side away from the prism, and thus said nearly parallel light is directed to the exit surface of the light guide or to the prism.
10 Citations
15 Claims
-
1. A light emitting device comprising:
-
a rod-shaped light guide; a light source which inputs light to the light guide; and a prism part which changes the direction of light input from the length-wise end of the light guide, and emits redirected light from a light exit surface that is disposed opposite the prism part;
whereina parallel light forming body, which makes light emitted from the light source toward the light guide nearly parallel light, is formed at the length-wise end of the light guide; a light emitting surface of the light source is shifted in a direction perpendicular to a center axis of the light guide from the center axis of the light guide and the optical axis of the parallel light forming body toward the side closer to the prism part, or toward the side away from the prism part, for the nearly parallel light to be directed to the light exit surface of the light guide or to the prism part; the light emitting surface is perpendicular to the center axis of the light guide. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An optical element comprising:
- a rod-shaped light guide; and
a prism part which changes the direction of light input from the length-wise end of the light guide, and emits redirected light from a light exit surface that is disposed opposite the prism part;
in which;a parallel light forming body, which makes light emitted from a light source toward the light guide nearly parallel light, is formed at the length-wise end of the light guide. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
- a rod-shaped light guide; and
Specification