Rotating shaft assembly and electronic device

An electronic device, comprising:

• a first part, a second part, and a rotating shaft assembly, wherein:
• the rotating shaft assembly comprises a shaft sleeve, a second shaft, and a flexible circuit board, wherein:
• the shaft sleeve comprises an inner cavity;
• a channel is formed on the second shaft, a first part of the second shaft is located in the inner cavity and is rotatably connected to the shaft sleeve, and a second part of the second shaft is located outside the inner cavity;
• the flexible circuit board comprises a first electrical connection end, a mounting part, and a second electrical connection end, the mounting part is located between the first electrical connection end and the second electrical connection end, both the first electrical connection end and the second electrical connection end are located outside the inner cavity, the mounting part comprises a wound part and a laminated part that are connected, the wound part is wound around the first part of the second shaft, the laminated part is in a folded state, and at least a part of the laminated part is accommodated in the channel of the second shaft;
• the first part of the electronic device is fixedly connected to an outer side of the shaft sleeve, the second part of the electronic device is fixedly connected to the second part of the second shaft, and the first part of the electronic device is capable of rotating relative to the second part of the electronic device by using the rotating shaft assembly, and is opened relative to the second part of the electronic device to open the electronic device or is closed with the second part of the electronic device to close the electronic device;
• and
• the first part of the electronic device has a first host circuit board assembly, the second part of the electronic device has a second host circuit board assembly, a third electrical connection end is electrically connected to the first host circuit board assembly, and a fourth electrical connection end is electrically connected to the second host circuit board assembly.