Patent ID: 8488132

Claim:
An optoelectronic position measurement device, comprising: a code carrier, which carries an optically detectable position code; a radiation source for emitting optical radiation onto the code carrier; a detection unit having at least one first sensor unit, which has at least one light-sensitive receiving region for receiving at least part of the radiation, as a result of which a scanning signal dependent on the position code can be generated and a position of the code carrier relative to the first sensor unit can thus be detected; and a refractive optical element, which is arranged between the code carrier and the first sensor unit and has a focusing segment and at least one neighboring segment, wherein: radiation incident in a parallel fashion or with an angle of incidence below a limit angle α with respect to the optical axis of the focusing segment can be directed by the focusing segment onto the receiving region of the first sensor unit, said receiving region lying in the optical axis; radiation incident with an angle of incidence in a deflection angle range above the limit angle α with respect to the optical axis can be deflected by the focusing segment and the neighboring segment onto a location outside the optical axis; the code carrier is moveable relative to the first sensor unit with one degree of freedom; the focusing segment and the neighboring segment have curved surfaces on the side facing the code carrier; and the radius of curvature of the surface of the focusing segment deviates from the radius of curvature of the surface of the at least one neighboring segment.