DETECTING METHOD FOR LENS GRADIENT

摘要

The present invention relates to a method for detecting the gradient of a lens in a luminous body including an LED and the lens. The lens gradient detection method according to the present invention includes a step of arranging the luminous body on a base plate; a step of outputting a first captured image by imaging the luminous body; a step of arranging a diffuser plate on the luminous body; a step of outputting a second captured image by imaging the luminous body through the diffuser plate; a step of obtaining the center of the luminous body on the first captured image; a step of obtaining the optical axial center of the luminous body on the second captured image; a step of comparing the center of the luminous body on the first captured image with the optical axial center of the luminous body on the second captured image; and a step of calculating the gradient of the lens corresponding to the difference between the center of the luminous body and the optical axial center of the luminous body. According to the present invention, the gradient of the lens of the luminous body is calculated by comparing the captured image of the luminous body including the LED and the lens with the captured image of the luminous body through the diffuser plate, and thus the positivity and negativity of the luminous body can be determined.