US Patent 7142288 Measuring device for contactless distance measurement

A measuring device for contactless distance measurement is disclosed, which has an optical transmission path (12), with an optical transmitter (22), and an optical receiver (13), with a receiving optical element (29) and an optical receiver (30), as well as an equipment module (11) that receives these components of the transmission and reception paths (12, 13). To maintain high measurement precision over the entire temperature range, the components of the transmission and reception paths (12, 13) are placed such that upon a temperature-dictated curvature of the equipment module (11) in the direction of the optical axes (121, 131) of the transmission and reception paths (12, 13), the optical axes (121, 131) are deflected in the same direction by the same amount. For this purpose, the transmission and reception paths (12, 13) are preferably convoluted such that the transmitter (22) and receiver (30) are both located on the same flat fastening face, fixed in the equipment module (11), the fastening face preferably being a printed circuit board (15) for receiving electronic components (FIG. 2).