| 摘要 |
Interface unit between a user and an electronic device comprising a control logic and a cathode screen (3) with a scanning facility where the luminous spot successively occupies all the points of the screen according to a predetermined scanning cycle. The control box has at least two lighting sensors of neighbouring and parallel axes which facilitate, by means of a microprocessor, the calculation of the position of a zone which is targeted by the control box on the screen and the transmission of information to the electronic device.
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