PHOTOGRAPHIC LENS OPTICAL SYSTEM

摘要

PURPOSE: A photographic lens optical system is provided to obtain a relatively large view angle and images of high resolution even though the lens optical system is small and light. CONSTITUTION: A photographic lens optical system includes a first lens (I), a second lens (II), a third lens (III), and a fourth lens (IV) which are sequentially arranged from a subject (OBJ) to an image sensor (IMG) between the subject and the image sensor in which an image of the subject is formed. The first lens has positive refractive power, and the incident surface thereof is convex toward the subject. The second lens has negative refractive power, and both surfaces thereof are concave. The third lens has positive refractive power and is formed into a meniscus shape convex toward the image sensor. The fourth lens has negative refractive power, and at least one of the incident surface and the projecting surface is an aspherical surface.