Spread illuminating apparatus
AssigneeMinebea Co., Ltd.
InventorToru KUNIMOCHI
Life of this patent
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Abstract
The thickness of a portion along an end surface of principal surfaces of a light guide plate is determined by a protruding part and a recessed part. By ensuring the dimensional accuracy in the thickness direction of the portion along the end surface of the principal surfaces and of the light guide plate with the protruding part and the recessed part, a light blocking member that is disposed spanning across the outer edge of at least one piece of optical sheet and an upper surface of a housing frame is not pushed up at the outer edge of the optical sheet. Therefore, the contact surface area of the light blocking member with the upper surface of the housing frame does not decrease, and the light blocking member can be reliably fixed to the upper surface of the housing frame.
Claims10
A spread illuminating apparatus comprising:
- a light guide plate in which one principal surface among a pair of opposing principal surfaces is a light emitting surface;
- at least one piece of optical sheet that is stacked on the emitting surface;
- a light source disposed opposing an incident light surface of the light guide plate;
- and
- a frame for accommodating the light guide plate,
- wherein on the principal surfaces of the light guide plate, a protruding part that projects in a thickness direction and a recessed part that is recessed in the thickness direction are provided so as to form a pair along an end surface, of the light guide plate.
Dependencies are inferred from the claim text.