Device for generating a toroidal source of illumination
AssigneeForus Health Pvt. Ltd.
InventorsSourav Pal, Ranjith Kumar, Ronal Issac Vettikattu, Justin Antony
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Abstract
Disclosed is a device for generating a toroidal source of illumination is disclosed. The device comprises a translucent disc with a concentric hole. A planar coil of side emitting optic fiber is disposed on one surface of the disc. The coil is energized with an LED at one end of the coil. The light emitted by the side of the coil is randomly scattered by the disc producing a toroidal source of light at the other surface of the disc. This source is used with instruments for assessing the dryness of the human eye. Further embodiments describe adaptations for measuring tear breakup time and the height of the tear meniscus in the human eye.
Claims12
A planar toroidal light source, comprising:
- a planar toroidal colorless translucent disc having a concentric circular hole of a diameter;
- a planar spiral coil of side emitting optical fiber, the coil having a pitch, and the coil being attached to a first surface of the disc such that the coil and the disc are concentric, and
- wherein a first end of the coil is supplied with visible light from a point source of light for creating a toroidal disc of uniform brightness at a second surface of the disc.
A light source for a device for measuring a height of a tear meniscus in an eye of a human subject, the light source comprising:
- a planar toroidal translucent colorless disc having a concentric circular hole of a diameter;
- a planar spiral coil of side emitting optical fiber, the coil having a pitch, and the coil being attached to a first surface of the disc such that the coil and the disc are concentric,
- wherein a first end of the coil is supplied with visible light from a point source of light for creating a toroidal disc of uniform brightness at a second surface of the disc, and
- the light from the second surface of the disc being obstructed by an opaque circle, for forming a circular image on a cornea of the eye of the human subject illuminated by the light source.
A light source for a device for measuring a tear breakup time in an eye of a human subject, the light source comprising:
- a planar toroidal translucent colorless disc having a concentric circular hole of a diameter:
- a planar spiral coil of side emitting optical fiber, the coil having a uniform pitch, and the coil being attached to a first surface of the disc such that the coil and the disc are concentric,
- wherein a first end of the coil is supplied with visible light from a point source of light for creating a toroidal disc of uniform brightness at a second surface of the disc, and
- the light from the second surface of the disc being obstructed by an opaque cover with a plurality of circular concentric transparent slits for casting the image of the slits on a cornea of the eye of the human subject illuminated by the light source.
A planar toroidal light source, comprising:
- a planar toroidal translucent colorless disc having a concentric circular hole of a diameter;
- a planar spiral coil of side emitting optical fiber, the coil having a uniform pitch, and the coil being attached to a first surface of the disc such that the coil and the disc are concentric, and
- wherein the disc and the coil are illuminated from a first side proximal to the coil, with a point source of light positioned coaxially at a distance from the coil for the coil acting as a coiled cylindrical lens forming a planar spiral coil pattern brighter than a remaining part of the disc on a second side of the disc.
Dependencies are inferred from the claim text.