Keyboard with improved reliability

摘要

A keyboard comprises: several keys operated by a user, the operating forming, for each key, a signal representative, a flat waveguide having a first and second external face for a wave of light to reflect between the faces, the first face of the waveguide comprising an altered zone so part of the wave leaves the waveguide via the altered zone to backlight the keyboard, for each key a plunger moved between two positions, one in contact with the first face and the other distant from the first face, contact of the plunger with the first face causing the reflection of the wave in the waveguide to be locally frustrated, associated with each of the plungers, a sensor arranged in an empty space delimited by the second face, the sensor associated with the plunger and configured to detect the frustration of the reflection, the sensor forming the representative signal.

主权项

1. A keyboard comprising:
several keys intended to be operated by a user, the operating of the keys making it possible to form, for each key, a signal representative of the operation thereof, a flat waveguide having a first and a second external face, it being possible for a wave to reflect totally between the two faces, the first face of the waveguide comprising an altered zone altered so that part of the wave leaves the waveguide via the altered zone in order to backlight the keyboard, associated with each key a plunger that can be moved by the corresponding key between two positions, one in contact with the first face of the waveguide and the other distant from the first face, contact of the plunger with the first face causing the reflection of the wave in the waveguide to be locally frustrated, associated with each of the plungers, a sensor arranged in an empty space delimited by the second face, the sensor being configured to detect the frustration of the reflection, the sensor forming the respective representative signal.