| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging lens in which an optical performance is not deteriorated even under high-temperature thermal environment, respective aberrations are satisfactorily corrected, an optical length is short, and a sufficient back focus is secured. SOLUTION: The imaging lens is equipped with a first cemented type compound lens 14, an aperture stop S, a second cemented type compound lens 16, and a third cemented type compound lens 18, and is constituted by arranging them in this order from an object side to an image side. In the first cemented type compound lens, a first lens, a second lens and a third lens are arranged in this order from the object side to the image side. In the second cemented type compound lens, a fourth lens, a fifth lens and a sixth lens are arranged in this order from the object side to the image side. In the third cemented type compound lens, a seventh lens, an eighth lens and a ninth lens are arranged in this order from the object side to the image side. The first lens, the third lens, the fourth lens, the sixth lens, the seventh lens and the ninth lens are formed of curable resin material. The second lens, the fifth lens and the eighth lens are formed of high-softening-temperature optical glass material. COPYRIGHT: (C)2009,JPO&INPIT
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