| 主权项 |
1. A light irradiation device for applying light to a target object under relative movement, comprising:
a base; a plurality of light-emitting element groups, each of the plurality of light-emitting element groups having a plurality of light-emitting elements, the plurality of light-emitting elements being arranged in a matrix form on an upper surface of the base; and a plurality of lenses configured to cover the light-emitting element groups, respectively, the plurality of lenses radiating light emitted from the light-emitting element groups outwardly, wherein the plurality of light-emitting element groups comprise
a plurality of first light-emitting element groups located on an upstream side in a movement direction in which the target object is moved relative to the light irradiation device, anda plurality of second light-emitting element groups located on a downstream side in the movement direction, the plurality of lenses comprise
a plurality of first lenses which cover the plurality of first light-emitting element groups, respectively, anda plurality of second lenses which cover the plurality of second light-emitting element groups, respectively,an optical axis of light emitted through each of the plurality of first lenses and an optical axis of light emitted through each of the plurality of second lenses are inclined with respect to a normal to the upper surface of the base,the optical axis of light emitted through each of the plurality of first lenses is inclined toward the downstream side in the movement direction with respect to the normal to the upper surface of the base, andthe optical axis of light emitted through each of the plurality of second lenses is inclined toward the upstream side in the movement direction with respect to the normal to the upper surface of the base. |
