IMAGE PICKING-UP LENS, IMAGE PICKING-UP DEVICE AND MOBILE TERMINAL DEVICE

摘要

The present invention provides a wafer-scale lens in which a total optical length is short in comparison with an image height and astigmatism and other aberrations can be well corrected, and an optical system in which a lens element closest to the object side is thin in thickness. The optical system includes a first lens that is disposed closest to the object side and is positive in refractive power; a second lens that is disposed on the image side and has a concave surface on the object side; an i-th lens, (i‰¥3), that is disposed closest to the image side in lenses disposed on the image side and includes an i-th lens plate and a lens element which is formed on at least either the object side surface or the image side surface of the i-th lens plate, and has a refraction index different from the i-th lens plate and positive or negative refractive power; and satisfies 0.9>Y max /Y>0.61, where Y max : a distance from the optical axis to a point through which a main light beam of the most outer off-axis light flux on the image side surface of the i-th lens disposed on the object side of the i-th lens, and Y: the maximum image height determined by an optical system and an image picking-up element.