Light emitting device, surface light source, and liquid crystal display apparatus
AssigneePanasonic Corporation
InventorsTomoko Iiyama, Motonobu Yoshikawa, Daizaburo Matsuki
Life of this patent
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Abstract
A light emitting device (1) is configured to radiate light with an optical axis A at the center, and is provided with a light source (2), and a lens (3) that radially expands the light from light source (2). The light source (2) has a light emitting surface (21) extending in an X direction orthogonal to the optical axis A. The lens (3) is configured to have a greater refractive power in a Y direction orthogonal to the X direction than in the X direction. For example, the lens (3) has a light entrance surface (31) including an anamorphic curved surface with different curve forms between the X direction and the Y direction.
Claims11
A light emitting device for radiating light with an optical axis being at the center, comprising;
- a light source having a light emitting surface, the light emitting surface extending in a first direction orthogonal to the optical axis;
- and
- a lens for radially expanding the light from the light source, the lens having a greater refractive power in a second direction that is orthogonal to the optical axis and the first direction than in the first direction.
Dependencies are inferred from the claim text.