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US 12,674,912 B2Granted
Illumination device, lens, set of diffusion element and lens, sensor device, and traveling body
AssigneeNippon Sheet Glass Co., Ltd.
InventorsKeiji Tsunetomo, Satoru Kusaka
Life of this patent
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Abstract
An illumination device includes: a light source that emits parallel light or divergent light; a diffusion element that receives the light emitted from the light source and emits the light at a diffusion angle of 50° or more and 110° or less; and a lens group that has negative power, receives the light from the diffusion element by a first surface, and emits the light from a second surface at a light distribution angle of 140° or more.
Claims9
An illumination device comprising:
- a light source emitting parallel light or divergent light;
- a diffusion element receiving the light emitted from the light source and emitting the light at a diffusion angle of 50° or more and 110° or less;
- and
- a lens group having negative power, having a first surface that receives the light emitted from the diffusion element and a second surface that emits the light at a light distribution angle of 140° or more,
- wherein an emission angle θ1 of the light from the diffusion element, an emission angle θ2 of the light from the first surface of the lens group, and an emission angle θ3 of the light from the second surface of the lens group satisfy a relational requirement θ2−θ1≤θ3−θ2,
- wherein the illumination device exhibits a light-intensity distribution having a coefficient of variation (CV value) of 0.05 or less within a range of −70°≤θ3≤70°, the CV value being defined as a ratio of a standard deviation of the light intensity to an average light intensity in the same range.
3 more elements
Dependencies are inferred from the claim text.