Continuous zoom infrared lens

A continuous zoom infrared lens that can improve the image quality. The continuous zoom infrared lens includes the first lens group as the front fixed group; the second lens group as the zoom group; the third lens group as the compensation group; the fourth lens group as the rear fixed group; and the fifth lens group as the focusing group for Compensate the offset of the image plane position under different object distances and different temperatures; also includes a variable magnification drive cam. The beneficial effects of the utility model: the continuous zoom infrared lens of the utility model significantly improves the detection range and imaging quality, reduces the cost, and can achieve good imaging effects. The use of curve fitting technology to design the variable magnification drive cam made by the zoom cam curve can effectively solve the problem of image surface displacement during the zooming process. The continuous zoom infrared lens is characterized in that: the continuous zoom infrared lens includes a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens with positive refractive power arranged in sequence from the object side to the imaging side Group, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power; among them, the first lens group is a front fixed group for condensing and collecting light; the second lens group is a zoom group for changing the The focal length of the continuous zoom infrared lens; the third lens group is a compensation group, which is used to compensate the image surface movement of the continuous zoom infrared lens during zooming; the fourth lens group is a rear fixed group; the fifth lens group is a focus adjustment group Group, used to compensate the deviation of the image plane position under different object distances and different temperatures.