Optical: systems and elements – Lens – Asymmetric
Reexamination Certificate
2007-05-29
2007-05-29
Le, Thien M. (Department: 2876)
Optical: systems and elements
Lens
Asymmetric
Reexamination Certificate
active
11369130
ABSTRACT:
The combination of a rooftop optical element and a soft edge aperture stop, as well as the introduction of a negative spherical aberration in a positive focusing lens, improve working distance and depth of focus in both moving beam and imaging readers for electro-optically reading indicia such as bar code symbols, especially for close-in symbols, and moreover tend to reduce undesirable light intensity modulation in the beam profile thereby improving reader performance.
REFERENCES:
patent: 3129275 (1964-04-01), Determann
patent: 5821523 (1998-10-01), Bunte et al.
Barkan Edward
Gurevich Vladimir
Madej Dariusz J.
Patel Mehul M.
Shi David Tsi
Kim Tae W.
Kirschstein et al.
Le Thien M.
Symbol Technologies Inc.
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