Registers – Coded record sensors – Particular sensor structure
Patent
1989-08-10
1991-01-08
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235455, 235491, 250271, 250226, G06K 710
Patent
active
049838172
ABSTRACT:
Methods and apparatus for reading a luminescent and substantially transparent bar code 1 on a background surface 2 whose reflectance may vary over the coded area. Light 7 scans (70), and excites luminescence 8 in, the bar code 1. The light 7 also reflects (9) without luminescence from the background surface 2 of the bar code 1. A first electrical or optical signal 11 is provided (4) responsive to the reflected nonluminescent light 9, and a second electrical or optical signal 10 is provided (4) responsive to the luminescent 8. Typically the first signal 11 is processed (5) to provide a third signal 31 that varies with background reflectance substantially as does the second signal 10; and the second and third signals 10, 31 are combined (5) to provide a fourth signal 12 that is substantially independent of background reflectance in the coded area, and which is decoded (6) to provide the desired reading.
REFERENCES:
patent: 3180988 (1965-04-01), Burkhardt et al.
patent: 3207910 (1965-09-01), Hirschfeld et al.
patent: 3483388 (1969-12-01), Ogle et al.
patent: 3946203 (1976-03-01), Hecht et al.
patent: 4724309 (1988-02-01), Greene
"Noncontact Code Application", Technical Paper Presented by Second Advanced Tech. Con., U.S. Postal Service, Washington, D.C., 1986.
"Mechanized Sorting of Mail Using the Index", Damen, J. T. W., Proceedings of the Institution of Mech. Engineers, pp. 31-36, May 1986.
"Advances in High Speed Phosphor Printing", Evans, D., Paper C82/86, Proceedings of the Institution of Mech. Engineers, pp. 23-29, May 1986.
Andus Paul G.
Dolash Thomas M.
O'Loughlin Mark E.
Battelle (Memorial Institute)
duBois Steven M.
Dunson Philip M.
Levy Stuart S.
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