The annular light source provides different irradiation angles and different color combinations to directly illuminate the measured object, which can highlight the three-dimensional information of the object, avoid the shadow phenomenon of Angle irradiation, highlight the imaging characteristics, and can be used in combination with the diffuse plate to make the light more uniform and soft to expand the heat dissipation area, and improve the heat dissipation performance of the light source. Application :PCB substrate detection; Plastic container detection; Detection of electronic components; Integrated circuit character detection; Semiconductor product appearance character detection; Product packaging appearance and label inspection; Broken pills, lack of testing; Spherical object lighting; Pin location of components.