SHORT DISTANCE IRIS RECOGNITION CAMERA

• US 20130135513A1
• Filed: 07/22/2011
• Published: 05/30/2013
• Est. Priority Date: 08/13/2010
• Status: Active Grant

• Current Assignee: ARIA Hightech Company Limited, Kyung Yong Choi
• Original Assignee: ARIA Hightech Company Limited, Kyungh Yong Choi
• Inventors: Ko, Deok Yong, Choi, Kyung Yong
• Granted Patent: US 8,913,119 B2
• Time in Patent Office: Days
• US Class Current: 348/335
• CPC Class Codes: A61B 3/14 Arrangements specially adapted for eye photography apparatus or arrangements for taking photographs per se G03B
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/117 Identification of persons methods or arrangements for recognising patterns, e.g. fingerprints, G06F18/00, G06V40/00; identification of persons by analysing their voice or speech G10L17/00
• CPC Class Codes: A61B 5/6821 Eye
• CPC Class Codes: G06V 10/141 Control of illumination
• CPC Class Codes: G06V 10/145 Illumination specially adapted for pattern recognition, e.g. using gratings
• CPC Class Codes: G06V 10/147 Details of sensors, e.g. sensor lenses fingerprint or palmprint sensors G06V40/13; vascular sensors G06V40/145; eye sensors G06V40/19
• CPC Class Codes: G06V 40/19 Sensors therefor
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/56 provided with illuminating means

Abstract

The short distance iris recognition camera of the present invention has a prism, installed on top of a guide for an infrared LED light, which has an inclined surface and a protrusion part, thereby enhancing the degree of uniformity in brightness around an iris, and thus enhancing iris recognition, and also effectively preventing static electricity from being delivered to internal devices. To accomplish this, the camera for iris recognition according to the present invention comprises a sensor and accessory circuits, a lens, and a lighting source including a white light and an infrared LED light. The lighting source is spaced apart from the lens centerline by a set length. The object plane of the lens is located where the iris is located, and is spaced apart by a set length L from the end of the lens. In practice, the object plane comprises the area around the lens centerline. The phase surface of the lens is an image sensor surface. The lighting source is disposed exactly or nearly parallel to the lens centerline such that the lighting centerline directs the object plane of the lens and has a lighting inclination angle of at least the arctangent of D/L with respect to the centerline of the lens. And also, the lighting centerline is separated from the centerline of the lens and inclined with respect to the object plane.

Claims

1. A short distance iris recognition camera comprising a sensor and appendant circuits, a lens, and a lighting source including a white light source and a lighting IR LED,

the lighting source is spaced apart from a lens center line of the lens by a predetermined distance, an object plane of the lens is a location at which an iris is placed, is spaced apart from an end of the lens by a predetermined distance L, and is actually a region around the lens center line, an imaging surface of the lens is an image sensor surface, and

wherein a lighting center line is formed to have an inclined lighting angle corresponding to arctangent D/L with the lens center line of the lens to be oriented to the object plane of the lens, the lighting source is disposed in parallel with or approximately in parallel with the lens center line of the lens, and a prism is disposed to be spaced apart from the lens center line of the lens and to irradiate the object plane in an inclined manner.

2. The short distance iris recognition camera of claim 1, wherein primary guidance is provided using a mirror formed of an elliptical mirror so that the iris is placed exactly on the object plane of the lens, and a sound device or indication light 300 that provides notification that iris recognition is being performed is used to provide secondary precise guidance.

3. The short distance iris recognition camera of claim 1, wherein an incident surface of the prism is configured as an inclined surface so as to irradiate the object plane with respect to the vertical disposition of the lighting IR LED.

4. The short distance iris recognition camera of claim 1 or 3, wherein minute protrusions are formed on both or one of the incident and exit surfaces of the prism to disperse light and thus make brightness uniform.

5. The short distance iris recognition camera of claim 1 or 3, wherein the exit surface of the prism is configured as a convex spherical surface or a concave spherical surface, thereby adjusting lighting to an arbitrary angle.