Medical Headlamp Light Guide for Adjustable Beam Width
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Solution Overview
Problem
Designing a highly efficient medical headlamp that minimizes light loss and allows for adjustable beam width is challenging due to the iris mechanism, which complicates positioning the light source and results in increased costs from requiring multiple headlamp designs for different purposes.
Innovation Solution
A high-efficiency medical headlamp with a cylindrical housing and a light guide having a reflective interior surface, supporting a high-efficiency light source and optical assembly with a refractive lens, allowing for adjustable beam width through an iris actuation mechanism, and using a single design for various LED types to reduce production complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light source is positioned close to the iris blades, then the beam width can be adjusted effectively, but light is blocked and not emitted from the front end of the headlamp
Solution Approach 1:
A light guide is introduced as an intermediary component between the light source and the iris. The light guide has a reflective interior surface that channels light from the source positioned behind the iris to the front opening, allowing beam width adjustment while preventing light blockage and ensuring efficient light transmission to the front end of the headlamp.
2Adaptability or versatility
If multiple headlamp designs are produced for different purposes, then various surgical lighting needs are met, but production costs and part stocking complexity increase
Solution Approach 1:
The headlamp design incorporates interchangeable optical assemblies that can be attached to a common housing. This universal base design with standardized mounting mechanisms allows a single headlamp platform to serve multiple surgical lighting needs by simply changing the optical assembly, eliminating the need for multiple complete headlamp designs and reducing production costs and part stocking complexity.
3Shape
If the light source is positioned behind the iris blades by more than a centimeter, then the light beam spreads out adequately, but some light is lost
Solution Approach 1:
The design replaces the traditional mechanical positioning approach with an optical solution. Instead of physically positioning the light source at the optimal distance behind the iris, a light guide with reflective interior surface is used to optically extend the light path. This allows the light source to be positioned close to the iris for effective beam control while the reflective channel ensures adequate beam spread and minimizes light loss through efficient light redirection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a more compact, lightweight headlamp with improved light efficiency, longer battery life, and the ability to adjust beam width without the need for multiple headlamp designs, reducing production expenses and enhancing surgical lighting options.
Implementation Method 1
A light guide is supported in the housing immediately in front of the high-efficiency light source and defining a channel that is open at its back and its front and having a reflective interior surface
Implementation Method 2
An optical assembly, including at least one refractive lens, is supported in the housing in front of the light guide
Data Source
AI summary
A high-efficiency lamp, emitting light from a front surface, and having a high-efficiency light source, producing a first light beam. An iris assembly has an annular body that defines a first annulus and has iris blades which can be extended into the annulus to form a second, smaller, annulus. This iris assembly is positioned relative to the light source so that the iris blades are in front of the high-efficiency light source. The annular body and therefore the first annulus have finite depth from back to front. A light guide is placed immediately behind the iris blades and defines a channel that is open at its back and its front and has a reflective interior surface, with the open back being transversely coincident to the light source so that light from the light source can travel through the channel to and out from the open front.