Illumination device and display unit

1. A illumination device comprising:

a light source;

an optical component provided separately from the light source;

a holding member holding the light source and the optical component, wherein the holding member is divided into a plurality of divided holding members in a longitudinal direction of the optical component, adjacent ones of the plurality of divided holding members having end portions facing one another to define dividing parts and being joined at the dividing parts, each of the end portions having a projection and a step part by which the adjacent ones of the plurality of divided holding members are coupled with each other; and

a variable pressing member variably pressing the optical component against the holding member.

2. The illumination device according to claim 1 , wherein the variable pressing member is a stopper that is movable in stages in a first direction, and is restrained in movement in a second direction, the second direction being opposite to the first direction.

3. The illumination device according to claim 2 , wherein the stopper includes a U-shaped body and a claw, the U-shaped body including a first leg part, a second leg part, and a curving part coupling the first leg part and the second leg part, and the claw being provided outside the first leg part.

4. The illumination device according to claim 3 , wherein

the holding member has a sawtooth section in which a plurality of grooves is arranged in the first direction with ridges in between, and

the stopper is regulated in position by engagement of the claw and the groove, and the claw climbs over the ridge and engages with the groove adjacent to the ridge to allow the stopper to be movable in the first direction.

5. The illumination device according to claim 4 , wherein

the stopper has an extension part extending from a front end of the second leg part, the extension part having a clearance with a front end of the first leg part,

a first end of the optical component is in contact with the extension part, and

when the extension part is pressed in the second direction by the first end of the optical component, the extension part comes into between the first leg part and the second leg part of the U-shaped body to restrain the claw from climbing over the ridge.

6. The illumination device according to claim 4 , wherein

a first end of the optical component is in contact with the curving part, and

when the curving part is pressed in the second direction by the first end of the optical component, the first leg part and the second leg part of the U-shaped body are opened outward to restrain the claw from climbing over the ridge.

7. The illumination device according to claim 1 , wherein the variable pressing member is an elastic component capable of pressing the optical component in a first direction in the holding member.

8. The illumination device according to claim 7 , wherein the elastic component is formed of one or more of a metal spring, a resin, a foamed body, and elastomer.

9. The illumination device according to claim 7 , wherein the elastic component is configured of a torsion coil spring.

10. The illumination device according to claim 7 , wherein the elastic component is configured of a metal spring and a non-metal optical component cover provided between the metal spring and the optical component.

11. The illumination device according to claim 10 , wherein

the holding member has a sawtooth section in which a plurality of grooves are arranged in the first direction with ridges in between, and

the optical component cover has a claw outside thereof, is regulated in position by engagement of the claw and a groove from the plurality of grooves, and in case the claw climbs over a ridge of the ridges to engage the groove adjacent to the ridge, the optical component cover is movable in the first direction.

12. The illumination device according to claim 1 , wherein the optical component is a wavelength conversion member configured by sealing a wavelength conversion material in a tubular container.

13. The illumination device according to claim 12 , wherein the wavelength conversion material contains a quantum dot.

14. The illumination device according to claim 12 , wherein

the light source is a blue light source, and

the wavelength conversion material converts a wavelength of blue light into a wavelength of red light or green light.

15. The illumination device according to claim 1 , wherein

the optical component includes a plurality of optical components,

the plurality of optical components are arranged in line with one another,

the holding member has a wall at a boundary between adjacent two optical components, the wall receiving a second end in the longitudinal direction of each of the optical components, and

the variable pressing member is provided on a first end of the longitudinal direction of the respective optical components.

16. The illumination device according to claim 1 , wherein the light source is a light emitting diode (LED).

17. A display unit provided with a liquid crystal panel and an illumination device provided on a back surface side of the liquid crystal panel, the illumination device comprising:

a light source;

an optical component provided separately from the light source;

a holding member holding the light source and the optical component, wherein the holding member is divided into a plurality of divided holding members in a longitudinal direction of the optical component, adjacent ones of the plurality of divided holding members having end portions facing one another to define dividing parts and being joined at the dividing parts, each of the end portions having a projection and a step part by which the adjacent ones of the plurality of divided holding members are coupled with each other; and

a variable pressing member variably pressing the optical component against the holding member.