Circuit structure, front-end assembly, and endoscope

A circuit structure, applied to a front-end assembly of an endoscope, and comprising a connecting unit and a mounting unit, wherein the mounting unit is connected to a distal end of the connecting unit;

• the connecting unit comprises a first extension segment, a bending segment, and a second extension segment connected sequentially;
• an extension direction of the first extension segment is parallel to an extension direction of the second extension segment;
• and the bending segment extends along a circumferential direction of the front-end assembly, such that the first extension segment and the second extension segment are distributed in a staggered manner in a circumferential direction of the mounting unit;
• and
• the mounting unit forms an arc-shaped plate-like structure or an arc-shaped ribbon-like structure, such that a radial inner side of the mounting unit forms an instrument tube avoidance area;
• the mounting unit comprises an imaging module mounting area;
• the mounting unit is provided with an illumination module mounting area located on at least one side of the imaging module mounting area;
• and the first extension segment is connected between the imaging module mounting area and the illumination module mounting area.