Lens focus adjustment assembly and projector

A projector, comprising a lens focus adjustment assembly;

• wherein the lens focus adjustment assembly comprises:
• a barrel, comprising a barrel body and a limiting structure, wherein the barrel body defines a receiving space, and the barrel body is provided with a channel;
• a focus adjustment ring, sleeved onto the barrel body and rotatable about the barrel body, wherein the focus adjustment ring is provided with a groove disposed along a helix, and the limiting structure prevents the focus adjustment ring from moving along an axial line of the barrel body;
• and
• a motion assembly, comprising a support member and a mating member, wherein the support member is configured to fix a lens and positioned in the receiving space, and the mating member extends from the support member and runs through the channel and mates with the groove;
• wherein when the focus adjustment ring rotates about the barrel body, the groove mates with the mating member and drives the mating member to move back and forth along the channel, and the mating member meanwhile drives the support member to move along the axial line of the barrel body in the receiving space.