Image pickup optical system, image pickup apparatus and distance measurement system

摘要

Provided is a technology which is suitable for both widening an image capture view angle and securing an angular resolution across the entire image capture range. In an imaging optical system, a rate of change of an image height per view angle, i.e. dy/d¸, is greater than 0 at a maximum view angle ¸max, a rate of change of a view angle per image height, i.e. D(¸) = 1/(dy(¸)/d¸), satisfies an expression D(¸p) {(D(¸max) - D(0))/¸max¸}¸p + D(0), with ¸p which lies in a range of 0 ¸ ¸max, and it satisfies an expression 1.5 (y(¸s)/¸s)/{(y(¸max) - y(¸s))/(¸max - ¸s)} 3.0 with a switching view angle ¸s of the rate of change D(¸) of the view angle per image height.