Back-support softbox and photographic auxiliary device

A back-support softbox, having an expanded state and a folded state, the back-support softbox comprising:

• a foldable frame, comprising a plurality of first rods, a plurality of second rods, an upper wheel, and a lower wheel, wherein each first rod has a fixed end and a free end, and the fixed end is hinged to the upper wheel;
• and wherein the plurality of second rods are provided in one-to-one correspondence with the plurality of first rods, one end of each second rod is hinged to a corresponding first rod, and an other end of each second rod is hinged to the lower wheel;
• a flexible reflective fabric, having an inner surface and an outer surface and being attached to the plurality of first rods, wherein in the expanded state, the reflective fabric is stretched to form a dome-shaped structure;
• a plurality of light-emitting components, provided on the inner surface of the reflective fabric;
• and
• a support rod, one end of the support rod being fixedly connected to the lower wheel, an other end of the support rod passing through the upper wheel and extending to an outside of the dome-shaped structure,
• wherein when the back-support softbox is transformed from the folded state to the expanded state, the upper wheel and the lower wheel move toward each other, and the plurality of first rods and the plurality of second rods rotate away from the support rod;
• and when the back-support softbox is transformed from the expanded state to the folded state, the upper wheel and the lower wheel move away from each other, and the plurality of first rods and the plurality of second rods rotate toward the support rod.