Light emitting device, surface light source device, and display device
AssigneeEnplas Corporation
InventorsHiroaki Okuyama, Masaki Nogami, Takuro Momoi
Life of this patent
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Abstract
A light emitting device of the present invention is a light emitting device including a light emitting element and a light flux controlling member for controlling light from the light emitting element. The light flux controlling member includes an incidence surface, a total reflecting surface, and an emission surface. In a light distribution curve indicating a far-field light distribution of the light emitting device, when an integral value of a luminous intensity in a range of 0° to 180° is A, and an integral value of a luminous intensity in a range of 83° to 97° is a1, a1/A is from 0.23 to 0.38.
Claims7
A light emitting device comprising a light emitting element and a light flux controlling member for controlling light from the light emitting element, wherein
- the light flux controlling member includes
- an incidence surface for allowing incidence of the light from the light emitting element, the incidence surface being disposed to face a light emitting surface of the light emitting element,
- a total reflecting surface for totally reflecting, in a direction away from an optical axis of the light emitting element, the light incident on the incidence surface, and
- an emission surface for emitting the light reflected by the total reflecting surface, and
- in a light distribution curve indicating a far-field light distribution of the light emitting device,
- when an angle of a direction along the optical axis is 0°, an integral value of a luminous intensity in a range of 0° to 180° is A, and an integral value of a luminous intensity in a range of 83° to 97° is a1, a1/A is from 0.23 to 0.38.
Dependencies are inferred from the claim text.