Planar illumination device
AssigneeMinebea Co., Ltd.
InventorYasuo Ohno
Life of this patent
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Abstract
A planar illumination device comprises a light guide plate, a point-like light source arranged on an incoming-light face of the light guide plate, an inner frame formed substantially in a U-shape on a top view, and an outer frame having a seat portion and side walls wherein the light guide plate is accommodated in the inner frame and mounted on the seat portion of the outer frame, while the point-like light source is arranged along the incoming-light face of the light guide plate and held between the incoming-light face and the side wall of the outer frame. At the inner frame, an elastic action portion which is elastically deformed so as to make a partial contact with the outer frame and energizes the light guide plate toward the point-like light source is provided.
Claims6
A planar illumination device provided with a light guide plate;
- point-like light sources arranged on a side end face of the light guide plate;
- and a frame holding the light guide plate and the point-like light sources, wherein
- the frame comprises an inner frame formed substantially in a U-shape in the plane of the light guide plate and an outer frame having a plate-state seat portion and a plurality of side walls is installed upright on an outer edge portion of the seat portion so as to accommodate the inner frame;
- the light guide plate is accommodated in the inner frame and mounted on the seat portion together with the inner frame;
- the point-like light source is held between the side end face on an open side of the inner frame in the light guide plate and at least one of the plurality of side walls of the outer frame that is opposite the side end face;
- and
- an inner face side of each side constituting the inner frame is formed in a shape according to each side end face of the light guide plate, and on an outer face side of at least one of the sides constituting the inner frame, an elastic action portion is provided that is elastically deformed by making partial contact with at least one of the plurality of side walls of the outer frame and energizing the light guide plate toward the point-like light source.
Dependencies are inferred from the claim text.