Patent ID: 8422147
Filing Date: 2013-04-16
Classification: G02B

Abstract:
1. An image pickup lens comprising: lenses; and an aperture diaphragm, the number of the lenses being two, one of the lenses being a first lens and the other being a second lens, the aperture diaphragm, the first lens, and the second lens being arranged in this order from an object side to an image surface side, the first lens (i) having positive refractive power and (ii) being a meniscus lens whose surface facing toward the object has a convex shape, the second lens (a) having negative refractive power and (b) being a lens whose surface facing toward the object has a concave shape and whose surface facing toward the image surface is configured such that a central part has a concave shape and a peripheral part surrounding the central part has a convex shape, and each of the first and second lenses said image pickup lens being configured to satisfy the following inequalities (1) and (2): where f is focal length of an entire image pickup lens system, f