Projection lens

A projection lens, comprising:

• a display chip, an equivalent flat lens, a first refractive lens group, a diaphragm, and a second refractive lens group that are successively arranged;
• wherein the first refractive lens group comprises a first lens and a double-cemented lens that are successively arranged, wherein the double-cemented lens comprises a second lens and a third lens;
• and the projection lens satisfies the following condition:
• −170 mm≤Δ≤+170 mm
• TT<32 mm
• FOV=65°
• wherein Δ defines a depth of field of the projection lens at a projection distance of 400 mm, TT defines a total length of the projection lens, and FOV defines an angle of view of the projection lens.