Contact image sensor, especially a fingerprint sensor, has a light guide with light guiding surfaces and a fingerprint contact surface, with said guide being folded over on itself to minimize the sensor size

摘要

Contact image sensor has at least a light source, an light guide, a lens and a strip-type sensor. The light guide has an incident light surface (31), a first light guidance surface (32), a fingerprint contact surface (33), a second light guidance surface (34) and an image reflection surface (35). The light guide is repeatedly folded over in order to minimize the size of the sensor.