Multi-functional optical illuminators
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United States of America Patent
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May 31, 2022
Grant Date -
Oct 28, 2021
app pub date -
May 17, 2017
filing date -
May 17, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A multi-functional optical illuminator comprises: a light pipe (302) with an open frame structure for visual aiming of the illuminator to facilitate an alignment of a barcode; and a circuit board (304), attached to a back opening of the light pipe (302), comprising six dark field LEDs (308) for generating six dark field illuminations and two bright field LEDs (306) for generating bright field illuminations; wherein, the two bright field LEDs (306) produce two alternating point sources for providing bright field illuminations in different directions to minimize a specular reflection hot spot without using any diffuser during the bright field illuminations; wherein, chamfered inner edges of the light pipe (302) emit the dark field illuminations in different orientations from the light pipe (302). The illuminator is designed to provide dual-field, multi-color, multi-directional illumination. The non-closed form option not only can further reduce the weight but also can allow arrange opening area clearance for: (1) visual aiming and alignment in application, especially for hand held application; (2) reducing illumination crosstalk to unwanted directions; and for (3) mechanical integration. The improvements allow the illuminator to read direct product marking (DPM) type of barcodes.
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