Micro-illuminator for use with image recognition system

• US 6,540,392 B1
• Filed: 03/31/2000
• Issued: 04/01/2003
• Est. Priority Date: 03/31/2000
• Status: Expired due to Term

• Current Assignee: Sensar, Inc. (Advent International Corporation)
• Original Assignee: Sensar, Inc. (Advent International Corporation)
• Inventors: Braithwaite, Michael
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Ton, Anabel
• Application Number:
  US09/539,974
• Time in Patent Office: 1,096 Days
• Field of Search: 362/800, 362/555, 362/581, 362/539, 362/231, 362/244, 362/328, 362/554, 362/553, 235/462, 313/498
• US Class Current: 362/572
• CPC Class Codes: G06V 40/19 Sensors therefor
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A micro-illuminator suitable for illuminating the iris of the eye of a subject wearing eyeglasses for the purpose of imaging of the iris for identification of the individual comprises an LED having a micro-lens having an opaque portion sized to block light reflected from the substrate of an LED and a lens for focusing light directly emitted by the dies of the LED. The elimination of the reflected light and the focusing of the directly emitted light minimizes the size of specularities reflected from the surfaces of the subject'"'"'s eyeglasses.

Claims

1. A micro-illuminator comprising:

an LED having at least one die which emits light containing direct and reflected components;

a barrel composed of an opaque material, said barrel having a bore drilled axially therethrough, said bore having a diameter not greater than an area large enough to contain all of said dies; and

a length of fiber optic cable, attached to said barrel such that the longitudinal axis of said barrel and the longitudinal axis of said fiber optic cable lie along a straight line;

wherein said barrel masks at least some of said reflected light emitted from said LED and wherein said light emitted directly by said dies of said LED travel up through said bore and thereafter through said length of fiber optic cable.

2. The micro-illuminator of claim 1 wherein light emitted the end of said fiber optic cable opposite said barrel is focused at an angle not less than 5 degrees and not more than 45 degrees.