US 12,551,103 B2Granted

Annular light source device for neonatal fundus camera

AssigneeForus Health Pvt. Ltd.

InventorsSourav Pal, Justin Antony

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Abstract

Disclosed is a method for defining a structure of an annular light guide device, for a fundus camera. An initial cross section of a wall of a light guide device is created in predefined way. A hollow cavity for a light source is defined within this cross section. The surface of the hollow cavity is an ellipsoid. Using a ray tracing software tool, the initial cross section is refined to maximise total internal reflection of the light from the source within the cross section to achieve most efficient light guide device. Once the final cross section is created, it is rotated by 360 degrees on a predefined axis to obtain final structure of the light guide device. The method is developed for creating very small light guide as required in a fundus camera especially for neonatal applications.

Claims4

Dependent claims

A method for defining a structure of a light guide for generating annular light source, wherein the method comprises:

a. a step of obtaining an initial cross section of a wall of the light guide, wherein obtaining the initial cross section is by using cross sections of two truncated hollow cones;
b. a step of rotating the obtained cross section around a predefined axis for obtaining an inverted cup shaped structure;
c. a step of providing a predetermined number of hollow cavities for receiving light emitted by a predetermined number of LEDs;
d. a step of assessing the performance of the defined inverted cup shaped structure using a ray tracing software tool;
e. a step of checking if it at least meets predefined performance criteria;
f. a step of obtaining a modified cross section by modifying the initial cross section, for improved performance, when predetermined performance criteria are not met;
and repeating the steps b to f, until a structure meeting or exceeding the predetermined performance is obtained.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/268,202Filed 14 Dec 2021
Priority: IN 20204105518018 Dec 2020
Published: US 2024/0115131 A111 Apr 2024
Granted: 17 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

A61B 3/125
For looking at the eye fundus, e.g. ophthalmoscopes: with contact lenses
G02B 6/0021
By shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces: for housing at least a part of the light…
G02B 6/0068
Characterised by the light source being coupled to the light guide: arrangements of plural sources, e.g. multi-colour light sources
G02B 6/0073
Characterised by the light source being coupled to the light guide: light emitting diode [LED]