Illumination device
The illumination device includes a light source; an elongated light guide rod on which light emitted from the light source is made incident; a housing that houses the light guide rod; and a lens that scatters light emitted from the light guide rod, the light guide rod being flexible and formed in a substantially linear shape, and having a surface on which an emission pattern for emitting light in a specific direction is provided, the housing and the lens are being formed in a curved shape in conformity with a shape of the interior member, and the light guide rod being provided in the interior member in a state of being bent in a curved shape by being sandwiched between the housing and the lens.
1. An illumination device provided in an interior member of an automobile, comprising:
a light source; an elongated light guide rod on which light emitted from the light source is made incident; a housing that houses the light guide rod; and a lens that scatters light emitted from the light guide rod,
the light guide rod being flexible and formed in a substantially linear shape, and having a surface on which an emission pattern for emitting light in a specific direction is provided,
the housing and the lens being formed in a curved shape in conformity with a shape of the interior member, and
the light guide rod further being provided in the interior member in a state of being bent in a curved shape by being sandwiched between the housing and the lens.
2. The illumination device as claimed in claim 1 , wherein
at least one first abutting portion between the light guide rod and the lens and at least one second abutting portion between the light guide rod and the housing are disposed in a staggered manner along a longitudinal direction of the light guide rod.
3. The illumination device as claimed in claim 2 , wherein
a dimension of a gap between the light guide rod and the lens in a region between the neighboring first abutting portions and a dimension of a gap between the light guide rod and the housing in a region between the neighboring second abutting portions are greater than 0 mm and less than 1 mm respectively.
4. The illumination device as claimed in claim 3 , wherein
the dimension of the gap between the light guide rod and the lens in the region between the neighboring first abutting portions is smaller than the dimension of the gap between the light guide rod and the housing in the region between the neighboring second abutting portions.
5. The illumination device as claimed in claim 1 , wherein
the light guide rod includes a flat surface and an exit surface having a curvature, a cross-sectional shape of the light guide rod is substantially fan-shaped, and the emission pattern is formed on the flat surface.
6. The illumination device as claimed in claim 5 , wherein
the emission pattern is a dot pattern including circular dots, the dot pattern being a recessed and projected pattern,
the circular dots are arranged in a staggered mariner along a longitudinal direction of the light guide rod, and
a diameter of the circular dots is set so as to gradually increase as the circular dots are separated from the light source, and to gradually decrease thereafter and after a predetermined position.
7. The illumination device as claimed in claim 5 , wherein
the emission pattern is a prism pattern recessed inwards of the light guide rod.
8. The illumination device as claimed in claim 1 , wherein
the light emitted from the light guide rod is gradation emission having a nonuniform luminance distribution in a longitudinal direction of the light guide rod.
9. The illumination device as claimed in claim 1 , wherein
the light guide rod has a flexural modulus of 1500 to 4000 MPa.