Patent ID: 7656593

Claim:
An imaging lens comprising a first junction type compound lens, an aperture diaphragm, a second junction type compound lens, and a third junction type compound lens, wherein said first junction type compound lens, said aperture diaphragm, said second junction type compound lens, and said third junction type compound lens are arranged in this sequence from an object side to an image side, said first junction type compound lens comprises a first lens, a second lens, and a third lens arranged in this sequence from the object side to the image side, said second junction type compound lens comprises a fourth lens, a fifth lens and a sixth lens arranged in this sequence from the object side to the image side, the third junction type compound lens comprises a seventh lens, an eighth lens and a ninth lens arranged in this sequence from the object side to the image side, said first lens, said third lens, said fourth lens, said sixth lens, said seventh lens and said ninth lens are formed of a curable resin material, said second lens, said fifth lens and said eighth lens are formed of a high softening temperature glass material, said first lens and said second lens are directly bonded, said second lens and said third lens are directly bonded, said fourth lens and said fifth lens are directly bonded, said fifth lens and said sixth lens are directly bonded, said seventh lens and said eighth lens are directly bonded, and said eighth lens and said ninth lens are directly bonded, and the following conditions (1) to (12) are satisfied, 0 ≦|N 2 −N 1 |≦0.1 (1) 0 ≦|N 2 −N 3 |≦0.1 (2) 0≦|ν 2 −ν 1 |≦30.0 (3) 0≦|ν 2 −ν 3 |≦30.0 (4) 0 ≦|N 5 −N 4 |≦0.1 (5) 0 ≦|N 5 −N 6 |<0.1 (6) 0≦|ν 5 −ν 4 |≦30.0 (7) 0≦|ν 5 −ν 6 |≦30.0 (8) 0 ≦|N 8 −N 7 |≦0.1 (9) 0 ≦|N 8 −N 9 |≦0.1 (10) 0≦|ν 8 −ν 7 |≦30.0 (11) 0≦|ν 8 −ν 9 |≦30.0 (12) where N 1 : refractive index of said first lens N 2 : refractive index of said second lens N 3 : refractive index of said third lens ν 1 : Abbe number of said first lens ν 2 : Abbe number of said second lens ν 3 : Abbe number of said third lens N 4 : refractive index of said fourth lens N 5 : refractive index of said fifth lens N 6 : refractive index of said sixth lens ν 4 : Abbe number of said fourth lens ν 5 : Abbe number of said fifth lens ν 6 : Abbe number of said sixth lens N 7 : refractive index of said seventh lens N 8 : refractive index of said eighth lens N 9 : refractive index of said ninth lens ν 7 : Abbe number of said seventh lens ν 8 : Abbe number of said eighth lens ν 9 : Abbe number of said ninth lens.