Guide positioning device for continuous zoom thermal imager

The invention relates to the field of infrared thermal imagers, in particular to a guide positioning device for a continuous zoom thermal imager, and particularly, the tracking and aiming precision requirements of a thermal imager product are met. The positioning device is installed on the continuous zoom thermal imager, and is connected with a zooming group and a compensation group of the continuous zoom thermal imager; the positioning device is characterized by comprising guide rails, a cam cylinder and guide pin sets; the two guide rails are fixed on the left side and the right side of thecontinuous zoom thermal imager respectively; the cam cylinder is in a hollow cylinder shape; the continuous zoom thermal imager is arranged inside the cam cylinder; two sets of curve type sliding grooves are formed in the cylinder wall of the cam cylinder; the two pairs of the guide pin sets are mounted on the two guide rails respectively and slide along the guide rails; a pulley is arranged at the top of each guide pin s