METHOD FOR GENERATING LENS SHAPE INFORMATION FOR A POINT LIGHT SOURCE

摘要

According to the present invention, a method for generating lens shape information for a point light source comprises the steps of: receiving an input of information on the light distribution properties of a point light source, information on the light distribution properties of a target, and information on lens shape settings; generating lens shape information for a semispherical lens defining a cylindrical opening, in accordance with the lens shape settings information; dividing a light exit angle of the point light source into a first light exit angle range that is incident on a top surface of the opening and a second light exit angle range that is incident on a side surface of the opening, in accordance with the height of the opening of the lens shape information; outputting a quantity of light for the first and second light exit angle ranges, respectively, in accordance with the information on the light distribution properties of the point light source; dividing the information on the light distribution properties of the target into first and second information on the light distribution properties of the target in accordance with a ratio of the light output quantities, such that, when divided, the exit angles constitute the overall exit angle of the lens, and the quantities of light are equal; generating shape information for the top surface of the opening such that light incident through the top surface of the opening is refracted in correspondence with the first light distribution properties of the target; and generating shape information for an outer side surface of the lens such that light incident through the side surface of the opening is refracted in correspondence with the second light distribution properties of the target.