Portable LED Lighting Device with Movable Diffuser Screen
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Solution Overview
Problem
Existing portable lighting devices with arrays of light emitting diodes (LEDs) face challenges in dynamically altering illumination effects, as simple lens rotation is not effectively applicable to achieve desired beam angles, limiting the versatility of light distribution.
Innovation Solution
A portable lighting device featuring an array of LEDs with a transparent cover having lenses and a selectively movable diffuser screen made of flexible polymeric material, which can be positioned between the LEDs and the cover to diffuse light emissions, mixing the light from multiple LEDs and adjusting the beam angle by linear or transverse movement across the array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple lens rotation mechanism is used to alter beam angle, then the device structure remains simple, but it is not effectively applicable to LED arrays to achieve desired beam angles
Solution Approach 1:
The patent employs a movable diffuser screen that can be dynamically positioned between the LED array and the transparent cover. This dynamic element allows the beam angle to be adjusted from narrow to wide by controlling the diffuser's position, transforming a static lighting system into one with adaptable illumination characteristics.
Solution Approach 2:
The diffuser screen acts as an intermediary element between the LED array and the external environment. By positioning this diffuser at different locations, the system mediates the light distribution to achieve various beam angles without requiring complex mechanical rotation mechanisms.
2Adaptability or versatility
If a diffuser screen is added to diffuse light emissions from LED array, then beam angle adjustment capability is improved, but device complexity increases
Solution Approach 1:
The patent utilizes a thin, flexible diffuser screen that can be easily positioned and moved within the lighting device. This thin-film approach provides effective light diffusion and beam angle control without introducing bulky components or complex mechanical structures.
Solution Approach 2:
Instead of adjusting beam angle through rotational movement in one dimension, the patent introduces a positional dimension by moving the diffuser screen along the optical axis. This dimensional change provides a simpler mechanism for achieving variable beam angles.
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
Enables flexible adjustment of light beam angles from narrow to wide, allowing for customizable illumination effects by controlling the diffuser screen's position, effectively addressing the limitations of existing technologies in altering light distribution with LED arrays.
Implementation Method 1
a diffuser screen is operatively positioned between said array of light emitting diodes and said transparent cover and is selectively movable across said array of light emitting diodes so as to diffuse light emission from some or all of the light emitting diodes
Implementation Method 2
said transparent cover having a plurality of lenses in an inner surface thereof, each providing a respective lens in a light emission field of each light emitting diode
Data Source
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Figure 4~5
AI summary
A lighting module, particularly for a portable lamp, including an array of light emitting diodes (LEDs) (15), and a transparent cover (12) arranged in front of the LEDs (15), the cover (12) having plurality of lenses (16) on the inner surface thereof providing a respective lens (16) in the light emission field of each LED (15), and a diffuser screen (17) is positioned between the LEDs (15) and the cover (12) and can be moved linearly across the LEDs (15) so as to diffuse the light emission from at least some of the array or all of the array as is desired. The diffuser screen (17) comprises a flexible polymeric material which is stored around a roller (18) located to one side of the cover (12).