LATERAL SURFACE SENSOR AND IMAGING LENS SYSTEM THEREFOR

摘要

The invention relates to an imaging lens system for imaging circular lateral surfaces (9) of an object (10) onto an imaging plane, comprising a reflecting element (6) and a first angle-reducing element (3,17) which is arranged behind the reflecting element and which reduces the angle between a light beam emanating from the object (10) and the optical axis (12). The aim of the invention is to produce an imaging lens system for imaging circular side surfaces, which is easy to produce and which can be produced at low cost, in addition to exhibiting a large acceptance angle for incident radiation and being tolerant in relation to inaccurate positioning of the object. According to the invention, a second angle-reducing element (13) is arranged upstream from the reflecting element (6) in the direction of radiation. Said second element reduces the angle between a light beam (1,1) emanating from the object (10) and the optical axis (12).