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US 5,859,418 AGranted
CCD-based bar code scanner with optical funnel
AssigneeSymbol Technologies, Inc.
InventorsYajun Li, Joseph Katz
Life of this patent
Estimating the term…
Abstract
An optical funnel evenly distributes light from an array of LEDs to a bar code. A support member with a central aperture holds the LEDs. A shroud with an angled reflective interior surface spreads the light from the LEDs to the bar code. The funnel also optically isolates the LEDs from the photodector in the scanner.
Claims10
An optical funnel assembly for a bar code scanner, comprising:
- a) a support member having an aperture circumferentially disposed with respect to an optical axis of said scanner;
- b) a plurality of radiant energy sources supported by said support member in circumferential disposition with respect to said optical axis of said scanner;
- c) a shroud member disposed in circumscribing relation to said radiant energy sources and having a central aperture in circumferential disposition with respect to said optical axis of said scanner, said shroud member having an interior surface in a non-perpendicular relationship with optical axis and the radiant energy sources, said shroud member adapted for optical modification of a substantial portion of said radiant energy generated by said radiant energy sources;
- and
- an optical isolator disposed interiorly and circumferentially of said plurality of radiant energy sources for preventing the generating radiant energy from impinging upon a photodetector prior to exiting said shroud member.
2 more elements
Dependencies are inferred from the claim text.