Super wide-angle lens

#This is a U.S. National Phase Application under 35 USC 371 of International Application PCT/JP2007/071539 filed on Nov. 6, 2007.

#This application claims the priority of Japanese application no. 2006-315380 filed Nov. 22, 2006, the entire content of which is hereby incorporated by reference.

#The present invention relates to a small-sized wide-angle lens system, and in particular, to a small-sized super wide-angle lens for solid-state image sensor that is suitable for a digital input apparatus (for example, a digital still camera and a digital video camera), especially employed for a monitoring camera and an onboard camera, and is excellent in terms of optical performance and is low in terms of cost.

#FIG. 1 is a lens-constitutional diagram of a wide-angle lens system of Example 1.

#FIG. 2 shows aberration diagrams taken in YZ section and XZ section for a wide-angle lens system of Example 1.

#FIG. 3 shows a spot diagram of Example 1.

#L1: First lens L2: Second lens L3: Third lens L4: Fourth lens S: Aperture stop GF: Glass filter CG: Cover glass

#Embodiments suitable for the invention will be explained as follows, referring to the drawings.

#Incidentally, “power” mentioned in the present specification indicates a quantity defined by an inverse number of a focal length.