Sensor device with double telecentric optical system

摘要

A sensor device and a method for a double telecentric optical system includes a single focusing element, such as a lens. The device and method further include a mirror element arranged at a focal point of the single focusing element to reflect incoming light rays back to the single focusing element. The incoming and reflected light rays pass through different parts of the single focusing element to allow for a spatially separated arrangement of an object and its image.

主权项

1. A method for generating an image of an object, said method comprising acts of:
illuminating an object provided at a sensing region with a light source; focusing with a single focusing element light rays coming from the object to a focal point, said light rays coming from the object to the focal point being focused light rays; and reflecting with a mirror the focused light rays back to the single focusing element, said focused light rays back to the single focusing element being reflected light rays, wherein a plane of at least one of the object and of the image is tilted with respect to an optical axis of the single focusing element, wherein the single focusing element consists of one of a single lens and a single concave mirror, wherein the light source is configured to illuminate the sensing region by total internal reflection, and wherein light rays emitted from the light source contact the sensing region at an incident angle of illumination that is larger than a critical angel of the total internal reflection.