| abstract |
A projection lens for projecting an image onto a projection plane includes: a lens substrate; and an antireflective film disposed on a surface of the lens substrate. The antireflective film includes, in order starting from an air side of the antireflective film, a first layer, second layer, third layer, fourth layer, fifth layer, sixth layer, seventh layer, and eighth layer. The first layer is formed of MgF2. Each of the second layer, the fourth layer, the sixth layer, and the eighth layer has a refractive index of 2.0 to 2.3. Each of the third layer, the fifth layer, and the seventh layer is formed of SiO2. |