Patent ID: 11016275

Abstract:
A wide-angle lens 100 includes a first lens 10, a second lens 20, a third lens 30, a diaphragm 72, a fourth lens 40, and a fifth lens 50. The first lens 10 is a negative meniscus lens whose lens surface on an image side Lb is a concave curved surface. The second lens 20 is a negative lens whose lens surface on the image side Lb is a concave curved surface and whose lens surface on the object side La is convex curved surface. The third lens 30 is a positive lens whose lens surface on the image side Lb is a convex curved surface. The fourth lens 40 is a negative lens whose lens surface on the image side Lb is a concave curved surface. The fifth lens 50 is a biconvex lens. A refractive index n1 of the first lens 10 satisfies a conditional expression.