Lighting device and display device

1. A lighting device, comprising:

a translucent member formed integrally, having a same cross sectional tubular shape throughout a longitudinal direction, and comprising a lens that comprises a light incident surface for receiving an incident light and a pair of light exit surfaces for diffusing and emitting the incident light onto the light incident surface to an outside;

a substrate arranged inside the translucent member along the longitudinal direction; and

plural of light-emitting portions mounted on the substrate and emitting the light toward a region including the light incident surface of the translucent member,

wherein the light incident surface of the translucent member is provided facing the light-emitting portions,

wherein the lens of the translucent member comprises:

a pair of light guide portions for guiding the incident light onto the light incident surface to a pair of the light exit surfaces such that the incident light onto the light incident surface is diffused and emitted from the pair of light exit surfaces in a width direction that is orthogonal to the longitudinal direction;

a pair of shoulder portions holding an upper surface of the substrate; and

a pair of substrate holders holding a lower surface of the substrate,

wherein, in a cross-sectional view, the translucent member encloses the substrate and the plural of light-emitting portions,

wherein the translucent member is monolithically formed with the lens, and

wherein edges of the substrate are sandwiched between the pair of shoulder portions and the pair of substrate holders.

2. The lighting device according to claim 1 , wherein the pair of light guide portions comprises a pair of reflecting surfaces for reflecting a portion of the incident light onto the light incident surface toward the width direction.

3. The lighting device according to claim 2 , wherein the pair of light guide portions has a V-shape, and each portion of the translucent member has substantially a same thickness.

4. The lighting device according to claim 1 , wherein the translucent member further comprises the pair of shoulder portions provided on both sides of the lens and the substrate holders arranged so that a gap corresponding to a thickness of the substrate is provided between the substrate holders and the pair of shoulder portions, and

wherein the substrate is held between the pair of shoulder portions and the substrate holders.

5. The lighting device according to claim 1 , wherein the cross sectional shape of the translucent member includes a shape formable by extrusion molding.

6. The lighting device according to claim 1 , wherein the plural of the light-emitting portions are mounted on one surface of each of two substrate or on both surfaces of the substrate, and the translucent member comprises a pair of lenses in opposite directions so that light emitted from the plural of light-emitting portions is emitted through the pair of lenses in the opposite directions.

7. The lighting device according to claim 1 , wherein the translucent member contains a light-diffusing agent in an amount of not less than 0.1 mass % and not more than 3 mass % per 100 mass % of the translucent member.

8. A display device, comprising the lighting device according to claim 1 .

9. The lighting device according to claim 1 , wherein a single integral piece extends through an entirety of the translucent member.

10. The lighting device according to claim 1 , wherein an entirety of the translucent member is extrusion molded in a single piece.

11. The lighting device according to claim 1 , wherein an entirety of the substrate is arranged inside the translucent member along the longitudinal direction.

12. The lighting device according to claim 1 , wherein the translucent member further comprises:

a base defining a bottom of the lighting device; and

a pair of leg portions each connecting the shoulder portion to the base.

13. The lighting device according to claim 12 , wherein the lens is an integral part of the base, the pair of substrate holders, the pair of shoulder portions, and the pair of leg portions.

14. The lighting device according to claim 13 , wherein a bottom surface of the pair of the shoulder portions is disposed on an upper surface of the substrate.

15. The lighting device according to claim 14 , wherein the pair of substrate holders extends from the pair of the leg portions to a bottom surface of the substrate.

16. The lighting device according to claim 15 , wherein the pair of the leg portions extends from the pair of substrate holders to the base.

17. The lighting device according to claim 16 , wherein the lens, the base, the pair of substrate holders, the pair of shoulder portions, and the pair of leg portions include a same transparent resin.

18. The lighting device according to claim 16 , wherein an entirety of the lens, the base, the pair of substrate holders, the pair of shoulder portions, and the pair of leg portions includes a same transparent resin.

19. The lighting device according to claim 1 , wherein an entirety of the translucent member includes a same material.

20. The lighting device according to claim 16 , wherein an entirety of the lens, the base, the pair of substrate holders, the pair of shoulder portions, and the pair of leg portions consists of a same material.

21. The lighting device according to claim 1 , wherein the lens is formed so that the light emitted from the plural light-emitting portions is incident on the light incident surface and is emitted to the outside at a divergence angle of 100° to 160° which is diffused in a width direction of the substrate.