| 摘要 |
<p>An image pickup lens has four lenses arranged in an order of a first lens, a second lens, a third lens and a fourth lens from an object side. The first lens has positive refractive power and has a convex surface facing toward an object side, the second lens has the positive refractive power, the third lens has negative refractive power and has a concave surface facing toward the object side to be formed in a meniscus shape, and the fourth lens has the positive or negative refractive power and has a convex surface facing toward the object side to be formed in the meniscus shape.
An image pickup unit (50) comprising a solid state pickup element (51), a substrate (52) for holding the solid state image pickup element, a casing (53) and the image pickup lens (L1-L4) has a length of not more than 15 mm.</p> |
