Hand held two dimensional symbol reader with a symbol illuminati

Details Hand held two dimensional symbol reader with a symbol illuminati Hand held two dimensional symbol reader with a symbol illuminati

1992-04-10

1994-07-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, G06K 710

Patent

active

053311760

ABSTRACT:
A symbol reader which projects an illumination window or field that is the same size as a field of view of a sensor used to read a symbol. The illumination window is aligned with the field of view of the sensor. The window or field can provide an area of relatively constant illumination or edges of the window or field can be at a higher illumination creating an outline or capture border. The outline alone can be projected when the ambient light level is sufficient for capture of the symbol. The window or field can be created by projecting light from various light sources.

REFERENCES:
patent: 3502888 (1970-03-01), Stites
patent: 3961198 (1976-06-01), Aungst
patent: 4682016 (1987-07-01), Inoue
patent: 5151580 (1992-09-01), Metlitsky et al.

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