Abstract: An optical scanner for orthogonal scanning in read and/or write modes has a framing mirror (20) for linear vertical scanning and a rotating disc (30) with a circular array of concave reflectors (32) for horizontal scanning. Primary imagers (24, 164) focus the linear vertical scan onto a strip mirror (26) which reflects the scanned pixels to the concave reflectors. Preferably, the concave reflectors reflect the pixel image in a collimated beam which is focused by a collection optic (38, 200) onto radiation detector (40). Image rotator (221), collection aperture defining device (270, 272), aperture shading device (290), and a device for suppressing spurious radiation are also provided.