Optical path optimization for light transmission and reflection

Details Optical path optimization for light transmission and reflection Optical path optimization for light transmission and reflection

1995-10-31

1999-11-02

Metjahic, Safet

Incremental printing of symbolic information

Ink jet

Controller

356402, B41J 29393

Patent

active

059756748

ABSTRACT:
Light emitted from an obliquely angled LED source is directed by peripheral light tube walls which extend vertically toward media displaying printed indicia. The emitted light provides an illuminated area surrounding the printed indicia, while the light tube walls shield the printed indicia from excessive external light, so that a sensor measures the intensity of emitted light directly reflected from the media through a protective aperture.

REFERENCES:
patent: 3393602 (1968-07-01), Stouffer
patent: 4435674 (1984-03-01), Hevenor et al.
patent: 4471384 (1984-09-01), Sato et al.
patent: 4839722 (1989-06-01), Barry et al.
patent: 4916638 (1990-04-01), Haselby et al.
patent: 5262797 (1993-11-01), Boeller et al.
patent: 5404020 (1995-04-01), Cobbs
patent: 5596353 (1997-01-01), Takada et al.

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