Contactless control panel

An input panel for operating an electronic device or other equipment, comprising:

• a two-dimensional arrangement of buttons or keys, wherein each button or key is actuated when pressed, providing input to an electronic device or other equipment;
• and
• a sensor, mounted along an edge of the two-dimensional arrangement, detecting location of a user's finger above said buttons or keys, and transmitting the detected location as input to the electronic device or other equipment, the sensor comprising:
• a housing;
• a printed circuit board mounted in said housing;
• a linear array of interleaved light emitters and photodiode detectors mounted on said printed circuit board, having a length at least equal to a length or width of the two-dimensional arrangement;
• a plurality of lenses mounted in said housing in such a manner that, when said housing is mounted along the edge of the two-dimensional arrangement, the lenses (i) direct light from said emitters along a plane in an airspace above the buttons or keys, and (ii) direct light from the plane, reflected toward the lenses by an object inserted into the plane, onto said detectors;
• a processor mounted in said circuit board configured to synchronously activate emitter-detector pairs and configured to identify a location in the plane at which the object is inserted based on the detections of light reflected by the object;
• and
• a communications port configured to output the identified location to the electronic device or other equipment.

An optical sensor configured to provide a contactless input method for an electronic device or other equipment, the optical sensor being configured to perform a method comprising:

• projecting focused light beams from a series of locations along an edge of a control panel comprising a matrix of controls for an electronic device or other equipment, across a plane in an airspace in front of the controls, whereby the projected light beams traverse an area equal in size to the area of the matrix, each light beam being projected at a time that none of the other light beams is projected;
• detecting reflections of the projected light beams reflected by an object inserted into the plane;
• identifying which light beams are reflected;
• further identifying an angle at which the detected light beams are reflected;
• calculating a location in the plane at which the object is inserted based on said detecting, said identifying and said further identifying;
• and
• outputting the calculated location from the sensor to the electronic device or other equipment as an actuated corresponding location on the control panel.