Layer for detecting a code pattern, forms part of a reader unit with which the code pattern is viewed so that it assumes a different shape to its shape when viewed with the naked eye

摘要

Layer for detecting a code pattern (1) on a surface (0), whereby the layer forms a first device of a is part of a hand-held portable reader unit. The reader unit is placed at any position on the code pattern in order to read it. Pattern and reading layer are designed so that when the pattern is viewed through the a reading device that forms a second device of the reader unit the code pattern is seen with a changed shape. The changes to the shape are reversible so that the read process can be repeated as often as wanted. The invention also relates to a code pattern reading method, a reader unit and a sensor scanner comprising detector elements on a layer.