Patent ID: 7545587
Filing Date: 2009-06-09
Classification: G02B

Abstract:
1. An imaging lens comprising: a first lens having a substantially convex surface, having a positive refractive power, and arranged so that the convex surface of the first lens is on an object side; a second lens comprising a meniscus lens having a substantially concave surface, having a negative refractive power, and arranged so that the concave surface of the second lens is on the object side; a third lens having substantially convex surfaces on both sides, and having a positive refractive power; and a fourth lens comprising a meniscus lens having a substantially convex surface, having a positive refractive power, and arranged so that the convex surface of the fourth lens is on the object side, wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side so that lens apertures are configured to be stepwise increased from the first lens toward the fourth lens, and a space is provided between the first lens and the second lens, wherein surfaces of the lens are aspherical.