Apparatus and method for position determination

摘要

An apparatus for position determination has an optical scanning unit which is to be moved relative to a surface and which includes an image sensor for detecting light intensity patterns of light which is reflected by the surface. The apparatus furthermore has an electronic processing unit which is associated with the image sensor and configured to determine a traveled movement path and/or a movement speed of the optical scanning unit relative to the surface from a difference between light intensity patterns detected after one another in time. A further processing unit is configured to produce an intensity correlated signal which correlates with the intensity of the light reflected by the surface. An evaluation device is associated with the image sensor and is configured to recognize a graphical code pattern located on the surface with reference to the intensity correlated signal and to read out information from the code pattern.

主权项

1. An apparatus for position determination, having
an optical scanning unit (10) which is to be moved relative to a surface (16), the optical scanning unit including an image sensor (22) for detecting light intensity patterns of light which is reflected by the surface (16); and having an electronic processing unit (24) which is associated with the image sensor (22) and which is configured to determine a traveled movement path and/or a movement speed of the optical scanning unit (10) relative to the surface (16) from a difference between light intensity patterns detected after one another in time, wherein the or a further processing unit (24) is configured to produce an intensity correlated signal (50) which correlates with the intensity of the light reflected by the surface (16), wherein an evaluation device (28) is associated with the image sensor (22) and is configured to recognize a graphical code pattern (26) located on the surface (16) with respect to the intensity correlated signal (50) and to read out information from the code pattern (26), and wherein a regulator is provided which uses the intensity correlated signal (50) as an adjustment signal for regulating a gain factor of an input amplifier (52) of the processing unit (24) of the optical scanning unit (10) or for regulating a gain factor of an output amplifier (54) which adapts a power of a light source (18) of the optical scanning unit (10).