| 摘要 |
PROBLEM TO BE SOLVED: To provide a light irradiation device with which circular ring-shaped irradiation areas can be simultaneously applied by using only one light source.SOLUTION: A light irradiation device with which circular ring-shaped irradiation areas of an object to be irradiated arranged on a predetermined position are irradiated with light includes: a light-emitting LED element; a first lens which has an optical axis in common with the LED element, narrows a spread angle of light emitted from the LED element, and forms the light emitted therefrom into light with a predetermined spread angle; a second lens which has an optical axis in common with the first lens and refracts light transmitted from the first lens such that the light is transformed into circular ring-shaped light centered around the optical axis; and a third lens which has an optical axis in common with the second lens and focuses the light transmitted from the second lens on the irradiation areas with a ring shape. |
