Pickup device for reading pen

Claim 1

Optical pickup device, designed in particular for reading information contained in a given two-dimensional portion of a document comprising: an aiming window; pickup lens system designed to form an image of said two-dimensional portion on any light-detector associated with said optical pickup device and located behind said pickup lens system along its longitudinal axis; a selective mirror located substantially vertically above said window, said selective mirror dividing an optical beam from said window into a transmitted beam and a reflected beam; a reflecting mirror located in the continuation of the reflected beam from the selective mirror, directing said reflected beam in the direction of said pickup lens system of said device; a tubular body oriented along a longitudinal axis and containing said pickup lens system; a closed chamber which extends said tubular body, wherein a lower face of said closed chamber carries said aiming window and reflecting mirror in the same plane, and wherein an upper face of said chamber carries said selective mirror; and wherein said plane containing said aiming window and said reflecting mirror is parallel to a plane of the document.