Laser scanning and sensing device for detection around automatic doors

A light scanner device (10) for measuring a range and an angular direction of a target object (56), the device (10) comprising:

• a pulse source (12) adapted to transmit light pulses,
• a transmitter deflection means (20) adapted to sweep the transmitted light pulses in variable sweep directions across a sweep sector,
• a photodetection means (42) adapted to detect received light pulses that have been reflected in the sweep sector,
• a receiver deflection means (24) adapted to re-direct light pulses that have been reflected in the sweep plane (15) to the photodetection means (42), further comprising optical shielding means (32) adapted to optically shield transmitted light pulses on their trajectory from the pulse source (12) to the transmitter deflection means (20) and at least a portion of their trajectory extending from the transmitter deflection means (20) into the sweep sector from reflected light pulses on their trajectory between the photodetection means (42) and the receiver deflection means (24) and at least a portion of their trajectory extending in the sweep sector and ending on the receiver deflection means (24),
• wherein the transmitter deflection means (20) and the receiver deflection means (24) both comprise a multi-facet mirror comprising a plurality of facets, with at least one pair of facets substantially parallel to each other, and wherein the multi-facet mirror of the transmitter deflection means (20) and the multi-facet mirror of the receiver deflection means (24) are adapted to be rotated in synchronism with each other on a common rotation axis (38),
• wherein the multi-facet mirror of the transmitter deflection means (20) and the multi-facet mirror of the receiver deflection means (24) form a split multi-facet mirror comprising a groove adapted to optically separate the multi-facet mirror of the transmitter deflection means (20) and the multi-facet mirror of the receiver deflection means (24).