Abstract: The diode is incorporated in a fixed manner on the optical axis of a carrier lens. The carrier lens consists of a front portion with an outer transverse surface, formed concave towards the emitted light, and a longitudinal portion for incorporating he diode. The longitudinal portion has its outer longitudinal surface formed concave towards the diode. The concave transverse surface is surrounded by a further outer transverse system. The concave longitudinal surface is arranged to reflect the diode-emitted light rays towards the further outer transverse surface, which is arranged to transmit the light rays to the outside in a longitudinal direction.

Abstract: An elementary cell combinable to form dot matrix displays, in which a plurality of plates of non-magnetic insulating material, at least one of which is in contact with a plate of high magnetic permeability, define a seat for housing a polychrome sphere provided internally with a permanent magnet. In the plates of non-magnetic material there are arranged magnetic poles, which can be energized selectively to cause the sphere to rotate into predetermined positions.