Light source lens, illumination unit, and display unit
AssigneeSaturn Licensing LLC
InventorsRoger Corn, Yosuke Narita, Takeo Arai, Masami Sato
Life of this patent
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Abstract
An object of the present invention is to provide a light source lens that makes it possible to improve unevenness in a luminance distribution, an illumination unit, and a display unit. A light source lens (1) according to the present disclosure includes an incident surface on which light from a light-emitting device is incident, and an exit surface (20) that has a diffusing function at a center part (21) for light incident through the incident surface as well as a light-condensing function at at least a portion of an intermediate part (22) and a peripheral part (23) for the light incident through the incident surface.
Claims17
A light source lens comprising:
- an incident surface on which light from a light-emitting device is incident;
- and
- an exit surface comprising:
- a concave center part aligned with the incident surface,
- a convexly curved intermediate part surrounding the center part, and
- a peripheral part including a plurality of concavely curved shaped depression portions surrounding both the intermediate part and the center part,
- wherein the concave shape of the center part terminates into the curved intermediate part;
- wherein, in combination with the incident surface, the center part has a diffusing function for light incident through the incident surface, the intermediate part has a light-condensing function for light incident through the incident surface, and the peripheral part has a light-condensing function for light incident through the incident surface.
An illumination unit provided with a light-emitting device and a light source lens, the light source lens comprising:
- an incident surface on which light from the light-emitting device is incident;
- and
- an exit surface comprising:
- a concave center part aligned with the incident surface,
- a convexly curved intermediate part surrounding the center part, and
- a peripheral part including a plurality of concavely curved shaped depression portions surrounding both the intermediate part and the center part,
- wherein the concave shape of the center part terminates into the curved intermediate part;
- wherein, in combination with the incident surface, the center part has a diffusing function for light incident through the incident surface, the intermediate part has a light-condensing function for light incident through the incident surface, and the peripheral part has a light-condensing function for light incident through the incident surface.
A display unit provided with an illumination unit and a display panel, the illumination unit having a light-emitting device and a light source lens, the display panel displaying an image on a basis of illumination light from the illumination unit, the light source lens comprising:
- an incident surface on which light from the light-emitting device is incident;
- and
- an exit surface comprising:
- a concave center part aligned with the incident surface,
- a convexly curved intermediate part surrounding the center part, and
- a peripheral part including a plurality of concavely curved shaped depression portions surrounding both the intermediate part and the center part,
- wherein the concave shape of the center part terminates into the curved intermediate part;
- wherein, in combination with the incident surface, the center part has a diffusing function for light incident through the incident surface, the intermediate part has a light-condensing function for light incident through the incident surface, and the peripheral part has a light-condensing function for light incident through the incident surface.
Dependencies are inferred from the claim text.