An image based optical lens eccentric error inspection system

Optical Design of a Novel Collimator System with a Variable Virtual-Object Distance for an Inspection Instrument of Mobile Phone Camera Optics

“…To commercialize our designed collimator system for mobile camera phone optics, we need to obtain a relational expression for the displacement of the second lens group and the defocus of the test lens. When the test lens is installed behind the designed collimator, the equation for the height of the axial ray is expressed in Gaussian brackets, as in Equation (7) [27,28].…”

“…In Equation (7), ∆f represents the motion amount of the second lens group, and ∆l denotes the defocus of the test lens. In addition, when the crane design is completed, the refracting power and spacing of each lens group are determined.…”

“…Therefore, z 3 can be obtained from Equation (8). Hence, the unknown variables in Equation (7) are ∆f and ∆l. In fact, in the optical system designed and shown in Figure 5, z 3 is approximately 21.001 mm.…”

“…The proposed inspection processes that use a specialized image-processing algorithm were designed to reduce the overall assembly time and defects for compact camera module assembly. In addition, a real-time noncontact eccentric-error-measurement system that uses an optical setup without a rotating and clamping mechanism [7] and a method for detecting foreign substances on the lens surface were also proposed [8,9]. The system could assess the 2D surface defects and non-uniformity of the 3D film thickness of specific materials using pattern recognition and morphological techniques.…”