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US 9,804,478 B2Granted
Illumination apparatus
AssigneeCanon Kabushiki Kaisha
InventorAzusa Sugawara
Life of this patent
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Abstract
An illumination apparatus includes a light emitting unit, a first optical member arranged in front of the light emitting unit and including a first fresnel shape having condensing action, and a second optical member including a second fresnel shape having light diffusing action so as to face the first fresnel shape of the first optical member.
Claims8
An illumination apparatus comprising:
- a light emitting unit;
- a first optical member arranged in front of the light emitting unit and including a first fresnel shape having condensing action;
- and
- a second optical member including a second fresnel shape having light diffusing action so as to face the first fresnel shape of the first optical member,
- wherein the second fresnel shape includes a first diffusing portion in which light diffusing action relative to a direction perpendicular to a longitudinal direction of the light emitting unit is stronger than light diffusing action relative to the longitudinal direction of the light emitting unit, and a second diffusing portion annularly formed on both sides of the first diffusing portion.
2 more elements
Dependencies are inferred from the claim text.