Light source device
A light source device includes: a plurality of independently operable light emitting devices; a first lens facing the light emitting devices; and a second lens facing the first lens. A lower face of the first lens facing the light emitting devices includes: an entrance part located in a center where light from the light emitting devices enters, and a light guide part located outward of the entrance part and configured to guide light entering the entrance part. A lower face of the second lens facing the first lens includes a Fresnel lens face including a plurality of annular protruding portions.
1. A light source device comprising:
a substrate;
a housing defining an opening;
a plurality of independently operable light emitting devices mounted on the substrate;
a first lens fixed to the substrate and facing the light emitting devices, the first lens comprising:
a first main body having a lower face that faces the light emitting devices and comprises:
an entrance part located in a center of the lower face where light from the light emitting devices enters, and
a light guide part located outward of the entrance part and configured to guide light entering the entrance part, and
a first marginal part extending laterally from a periphery of the first main body; and
a second lens located in the opening defined by the housing and facing the first lens, the second lens comprising:
a second main body having:
a lower face that faces the first lens and comprises a Fresnel lens face composed of a plurality of annular protruding portions, and
a flat face located on a side opposite the Fresnel lens face, and
a second marginal part extending laterally from a periphery of the second main body; wherein:
an upper face of the first marginal part is fixed to a lower face of the second marginal part via an adhesive material.
2. The light source device according to claim 1 , wherein the entrance part is a concave portion formed in the lower face of the first main body.
3. The light source device according to claim 2 , wherein the lower face of the first main body comprises, in a bottom face of the concave portion, a lower face convex portion protruding towards the light emitting devices.
4. The light source device according to claim 1 , wherein the lower face of the first lens has a 4-fold symmetrical shape in a plan view.
5. The light source device according to claim 4 , wherein the lower face of the first lens has a quadrilateral shape in a plan view.
6. The light source device according to claim 1 , wherein:
an upper face of the first lens comprises:
an upper face convex portion located in a center,
an upper face concave portion that is contiguous with the upper face convex portion, and
a flat portion located outward of the upper face concave portion.
7. The light source device according to claim 1 , wherein the light emitting devices are collectively arranged in a quadrangle in a plan view.
8. The light source device according to claim 1 , wherein:
the second lens is fixed to the housing.
9. The light source device according to claim 1 , wherein:
an upper face of the first lens comprises:
an upper face convex portion provided in a center of the upper face, and
a flat portion located outward of the upper face convex portion.
10. A cellular phone comprising:
a cellular phone housing; and
the light source device according to claim 1 ; wherein:
the housing of the light source device is a portion of the cellular phone housing.
11. A light source device comprising:
a substrate;
a housing defining an opening;
a plurality of independently operable light emitting devices mounted on the substrate;
a first lens facing the light emitting device, the first lens comprising:
a first main body having a lower face that faces the light emitting device and comprises:
an entrance part located in a center of the lower face where light from the light emitting device enters, and
a light guide part located outward of the entrance part and configured to guide the light entering the entrance part, and
a first marginal part extending laterally from a periphery of the first main body; and
a second lens fixed to the housing, located in the opening defined by the housing, and facing the first lens, the second lens comprising:
a second main body having:
a lower face that faces the first lens and comprises a Fresnel lens face composed of a plurality of annular protruding portions, and
a flat face provided on a side opposite the Fresnel lens face, and
a second marginal part extending laterally from a periphery of the second main body; wherein:
an upper face of the first marginal part is fixed to a lower face of the second marginal part via an adhesive material.
12. The light source device according to claim 11 , wherein the entrance part is a concave portion formed in the lower face of the first main body.
13. The light source device according to claim 12 , wherein the lower face of the first main body comprises, in a bottom face of the concave portion, a lower face convex portion protruding towards the light emitting devices.
14. The light source device according to claim 11 , wherein the lower face of the first lens has a 4-fold symmetrical shape in a plan view.
15. The light source device according to claim 14 , wherein the lower face of the first lens has a quadrilateral shape in a plan view.
16. The light source device according to claim 11 , wherein:
an upper face of the first lens comprises:
an upper face convex portion located in a center of the upper face,
an upper face concave portion that is contiguous with the upper face convex portion, and
a flat portion located outward of the upper face concave portion.
17. The light source device according to claim 11 , wherein the light emitting devices are collectively arranged in a quadrangle in a plan view.
18. The light source device according to claim 11 , wherein:
an upper face of the first lens comprises:
an upper face convex portion provided in a center of the upper face, and
a flat portion located outward of the upper face convex portion.
19. A cellular phone comprising:
a cellular phone housing; and
the light source device according to claim 11 ; wherein:
the housing of the light source device is a portion of the cellular phone housing.