| 摘要 |
An imaging lens whose optical performance is not deteriorated even in a high-temperature environment, aberrations are satisfactorily corrected, optical length is short, and sufficient back focus is secured. The imaging lens is constituted by comprising a first lens (14), an aperture stop (S), a second lens (16), and a third lens (18) and arranging them in this order from the object side to the image side. A single lens is used as the first lens. In the second lens, a first sub-lens L1, a second sub-lens L2, and a third sub-lens L3 are arranged in this order from the object side to the image side. In the third lens, a fourth sub-lens L4, a fifth sub-lens L5, and a sixth sub-lens L6 are arranged in this order from the object side to the image side. The first lens is formed of a transparent curable silicone resin, and the first, third, fourth, and sixth sub-lenses are also formed of the transparent curable silicone resin. The second sub-lens and the fifth sub-lens are formed by using a glass material having a high curing temperature.
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