Portable image scanner with optical position sensors

An imaging device (10) may comprise an image head (24) having an elongate slot (38) therein with first and second lengthwise ends (52, 54). The image head (24) may also include a first navigation sensor aperture (42) and a second navigation sensor aperture (44) positioned adjacent the elongate slot (38) at positions other than positions that are aligned with the first and second lengthwise ends (52, 54) of the elongate slot (38). An image sensing system (34) optically aligned with the elongate slot (38) in the image head (24) is responsive to image light (40) passing through the elongate slot (38) and produces an image signal based on the image light (40). A first navigation sensor (48) optically aligned with the first navigation sensor aperture (42) in the image head (24) is responsive to first navigation light (46) passing through the first navigation sensor aperture (42) and produces a first navigation data signal based on the first navigation light (46). A second navigation sensor (50) optically aligned with the second navigation sensor aperture (44) in the image head (24) is responsive to second navigation light passing through the second navigation sensor aperture (44) and produces a second navigation data signal based on the second navigation light.