In at least one embodiment of the present disclosure, the metal layer 222 defines a laser marking area 226, and the two-dimensional coding image is laser fused through the metal layer 222 where the laser marking area 226 is located. By setting the laser marking area 226, the piercing of the metal layer 222 by laser forms a two-dimensional coding image, the two-dimensional coding image is fixed in a specific area, thereby facilitating a reading of the two-dimensional coding image by a scanning device.

In at least one embodiment of the present disclosure, the metal layer 222 may also be covered with a protective layer (not shown in the figure). The protective layer is frosted. The frosted protective layer not only protects the two-dimensional coding image, but also reduces light being reflected on the scanning window of the scanning device to improve a reading success rate of the scanning device in scanning the two-dimensional coding image.

In at least one embodiment of the present disclosure, the substrate 20 can also provide an optical element 26 and a connecting element 27. The optical element 26 may include a camera, a lens, a collimator, and the like. The connecting element 27 may be a steel sheet.

Referring to FIG. 5, a flow chart of a manufacturing method for a double-sided two-dimensional coding of the present disclosure is shown. The manufacturing method for a double-sided two-dimensional coding specifically includes the following steps. According to different requirements, an order of the steps in the flowchart may be changed, and some may be omitted.

In block S11, preparing a substrate of transparent medium.