Electronic device and manufacturing method for middle frame

An electronic device, comprising:

• a middle frame, wherein the middle frame comprises a bezel and a middle plate,
• wherein the bezel is of an annular structure and is disposed around an edge of the middle plate, and the bezel comprises at least two layers of annular structures,
• wherein any two adjacent annular structures in the at least two layers of annular structures are mutually attached, so as to locate the annular structure,
• wherein the at least two layers of annular structures comprise an inner layer structure and an outer layer structure,
• wherein the inner layer structure includes a first arc surface that protrudes in a direction away from the middle frame, the first arc surface being further away from the middle frame than an inner surface of the inner layer structure,
• wherein the outer layer structure includes a second arc surface attached to the first arc surface, and
• wherein the second arc surface matches a shape and a size of the first arc surface.

An electronic device, comprising:

• a middle frame, wherein the middle frame comprises a bezel and a middle plate,
• wherein the bezel is of an annular structure and is disposed around an edge of the middle plate, and the bezel comprises at least two layers of annular structures,
• wherein the at least two layers of annular structures comprise an inner layer structure and an outer layer structure, and
• wherein a thickness of the inner layer structure in a horizontal direction of the middle frame is greater than a thickness of the outer layer structure in the horizontal direction of the middle frame, and wherein a density of the outer layer structure is greater than a density of the inner layer structure.