Adjustable lens device

An adjustable lens device comprising:

• a tubular fixing seat having a surrounding wall that surrounds an axis and that defines a through hole, said surrounding wall having a first end portion, a second end portion opposite to said first end portion along the axis, a guide slot formed between said first and second end portions and extending parallel to the axis, and a positioning projection projecting radially and outwardly from said surrounding wall;
• a tubular adjusting seat sleeved on said fixing seat, said adjusting seat being formed with a driving slot that extends spirally relative to the axis and having an annular inner surface formed with an annular groove, said positioning projection being movably received in said annular groove so as to couple rotatably said adjusting seat to said fixing seat, said adjusting seat further having an end face formed with a notch that extends parallel to the axis, that extends to said annular groove and that permits movement of said positioning projection into and out of said annular groove;
• a first lens module mounted to said first end portion of said surrounding wall of said fixing seat, said first lens module including a first lens barrel and a set of first lenses mounted in said first lens barrel;
• and
• a second lens module mounted in said second end portion of said surrounding wall of said fixing seat, said second lens module including a second lens barrel, a set of second lenses mounted in said second lens barrel, and a guide component provided on said second lens barrel and passing through said guide slot in said fixing seat and said driving slot in said adjusting seat such that rotation of said adjusting seat relative to said fixing seat results in movement of said guide component along said guide slot and said driving slot to result in movement of said second lens module relative to said fixing seat along the axis.