Patent ID: 8891181

Claim:
A fixed-focus projection lens, in sequence along an optical axis from a screen side to a light modulator side, comprising: a first lens group, which has a positive refractive power, and has a first lens and a second lens in sequence from the screen side to the light modulator side, wherein the first lens is a plastic lens and has a negative refractive power, and the second lens is a glass lens and has a positive refractive power; and a second lens group, which has a positive refractive power, and has a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the screen side to the light modulator side, wherein the third lens is a plastic lens and has a negative refractive power; the fourth lens is a glass lens and has a negative refractive power; the fifth lens is a glass lens and has a positive refractive power, the fifth lens and the fourth lens are bonded together to form a compound lens having a negative refractive power; the sixth lens is a plastic lens and has a positive refractive power, and the seventh lens is a glass lens and has a positive refractive power; wherein the third lens has a convex side which faces the screen side; wherein the seventh lens is a single lens; and wherein the second lens is arranged alongside the first lens.