System for capturing an image of the retina for identification
First Claim
Patent Images
1. A system for capturing an image of a retina of an eye for identification comprising:
- a source of illumination light;
a lens through which the illumination light passes to illuminate the retina, the lens receiving light reflected from the retina;
an image signal generator responsive to light reflected from the retina to generate a signal representing an image of an illuminated area of the retina; and
an alignment system to align the eye along an axis that is at a predetermined angle with respect to a centerline of the lens, the alignment system including an elongated straight channel having an end into which a user looks, the longitudinal axis of the channel being the axis along which the eye is aligned and an object being disposed in the channel at a distance from the end into which the user looks wherein the aspect ratio of the diameter of the channel to the length of the channel from the location of the object to the end into which the user looks is such that the object is viewable when the eye is aligned along the longitudinal axis and is not viewable when the eye is not aligned along the longitudinal axis, and the system including an ultrasound transducer, and the system being responsive to the transducer to determine when the eye is at a predetermined distance from the image capturing system and providing an indication to the user when the eye is at the predetermined distance.
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Abstract
A system for capturing an image of the retina includes an alignment system that aligns the eye along a predetermined axis of the system and at a predetermined distance from the system to illuminate a predetermined area of the retina and to capture an image thereof. The predetermined area of the retina includes the optic disk. The system includes a non-scanned illumination source of red and green light symmetric aspheric lens for a high quality and high contrast image.
59 Citations
38 Claims
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1. A system for capturing an image of a retina of an eye for identification comprising:
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a source of illumination light; a lens through which the illumination light passes to illuminate the retina, the lens receiving light reflected from the retina; an image signal generator responsive to light reflected from the retina to generate a signal representing an image of an illuminated area of the retina; and an alignment system to align the eye along an axis that is at a predetermined angle with respect to a centerline of the lens, the alignment system including an elongated straight channel having an end into which a user looks, the longitudinal axis of the channel being the axis along which the eye is aligned and an object being disposed in the channel at a distance from the end into which the user looks wherein the aspect ratio of the diameter of the channel to the length of the channel from the location of the object to the end into which the user looks is such that the object is viewable when the eye is aligned along the longitudinal axis and is not viewable when the eye is not aligned along the longitudinal axis, and the system including an ultrasound transducer, and the system being responsive to the transducer to determine when the eye is at a predetermined distance from the image capturing system and providing an indication to the user when the eye is at the predetermined distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for capturing an image of a retina of an eye for identification comprising:
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a source of illumination light; a lens through which the illumination light passes to illuminate the retina, the lens receiving light reflected from the retina; an image signal generator responsive to light reflected from the retina to generate a signal representing an image of an illuminated area of the retina; and an alignment system including a member with an elongated straight channel therein, the channel having an end into which a user looks and a longitudinal axis at an angle with respect to a centerline of the lens, the angle being selected such that when the eye is aligned along said axis, said centerline intersects an area of the retina other than the fovea and an object disposed in the channel at a distance from the end into which the user looks wherein the aspect ratio of the diameter of the channel to the length of the channel from the location of the object to the end into which the user looks is such that the object is viewable when the eye is aligned along the longitudinal axis and is not viewable when the eye is not aligned along the longitudinal axis. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system for capturing an image of a retina of an eye for identification comprising:
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a source of illumination light; a lens through which the illumination light passes to illuminate the retina, the lens receiving light reflected from the retina; an image signal generator responsive to light reflected from the retina to generate a signal representing an image of an illuminated area of the retina; and an alignment system including; an elongated channel having an end into which a user looks and a longitudinal axis at an angle with respect to a centerline of the lens; a light disposed in the channel at a distance from the end into which a user looks so that the user'"'"'s eye is aligned along the longitudinal axis when the light is visible, the light having at least a first state and a second state; and a distance detector to determine when the eye is a predetermined distance from the image capturing system, the light changing state when the eye is at the predetermined distance. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification