Patent ID: 8858054

Claim:
A lighting device, comprising: a light guide plate made of a transparent material; an LED light source disposed to face at least one of edges of the light guide plate, the LED light source emitting light into the light guide plate; and a frame member disposed to enclose both at least a portion of the light guide plate and at least a portion of the LED light source and receiving the portions therein, wherein when, among the edges of the light guide plate, an edge that faces the light source is referred to as a (light-source facing edge), the frame member has a pair of inner surfaces extending parallel to a normal line direction of the light-source facing edge, with a receiving space defined between the inner surfaces, the receiving space receiving the LED light source therein such that the LED light source can be movable in a normal line direction of the light-source facing edge, a slide member is disposed so as to be slidable in the normal line direction on a side of the LED light source that is opposite to a side (hereinafter referred to as a (light source front side)) at which the light guide plate is disposed, the slide member having slide surfaces respectively coming into contact with the inner surfaces of the frame member, and a spring is provided between the slide member and the frame member while being compressed, the spring comprising: a first end in contact with the slide member; a second end in contact with the frame member; and a diagonal part disposed between the first end and the second end and provided to be inclined relative to the light-source facing edge, the diagonal part comprising a plate spring.