Warped LED Mounting Layout for Uniform Optical Path Lengths

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Solution Overview

Problem

The existing light-emitting devices have room for improvement in the quality of light emitted, particularly due to differences in optical path lengths between light-emitting elements, which affect the uniformity and efficiency of light emission.

Innovation Solution

A light-emitting device configuration with a warped mounting surface and strategically positioned light-emitting elements, reflective members, and a lens member, where the light-emitting surfaces of elements are offset in the front-rear direction to minimize differences in optical path lengths, ensuring that light from multiple elements is emitted while maintaining a consistent quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multiple light-emitting elements are arranged side by side, then the light output quantity increases, but the optical path length differences cause deterioration in light quality and uniformity

Engineering Contradiction:
Improvelight output quantityVSAvoidlight quality uniformity
Core Design Contradiction:
Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent transitions from a two-dimensional planar arrangement to a three-dimensional configuration by tilting the light-emitting surfaces at different angles and positioning them at different heights. The first light-emitting element is tilted at a first angle, the second at a second angle, and the third at a third angle, with their light-emitting surfaces positioned at different distances from the reflective member. This dimensional change allows multiple elements to emit light in the same direction while equalizing their optical path lengths, thereby maintaining light quality uniformity while increasing total light output.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent changes the physical parameters of the light-emitting elements' positions and orientations. Specifically, it adjusts the tilting angles (first angle, second angle, third angle) and the distances from the reflective member (first distance, second distance, third distance) to compensate for optical path length differences. By varying these parameters, the patent ensures that light from all elements travels equal distances to reach the same target point, resolving the uniformity issue while maintaining increased light output from multiple elements.

Inventive Principle:
Principle #35Parameter changes

2Manufacturing precision

If light-emitting elements are positioned to equalize optical path lengths, then light quality improves, but the device structure becomes more complex

Engineering Contradiction:
Improvelight quality uniformityVSAvoidstructural complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent combines multiple light-emitting elements (first, second, and third elements) into a single integrated device structure where they share common components such as the reflective member and lens. By merging these elements into one unified structure with coordinated tilting angles and positioning, the patent achieves equalized optical path lengths without requiring separate adjustment mechanisms for each element, thus improving light quality while limiting the increase in structural complexity.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The patent employs curved or angled surfaces for the light-emitting elements rather than flat, parallel surfaces. The first light-emitting element is tilted at a first angle, the second at a second angle, and the third at a third angle, creating a curved or spherical arrangement of light sources. This curvature allows the elements to be positioned at different orientations while maintaining equal optical path lengths to a common focal point, achieving light quality uniformity through geometric design rather than complex mechanical adjustments.

Inventive Principle:
Principle #14Spheroidality (Curvature)

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

This configuration enhances the quality and uniformity of light emitted by reducing optical path length differences, leading to improved light emission efficiency and reduced device size for optical control.

Implementation Method 1

The one or more reflective members are configured to reflect the light emitted from a corresponding one of the first light-emitting element, the second light-emitting element, and the third light-emitting element upward

Methodology Applied
Scientific EffectReflection: Reflection

Implementation Method 2

The lens member is disposed above the one or more reflective members and including a first lens portion through which the light emitted from the first light-emitting element passes, a second lens portion through which the light emitted from the second light-emitting element passes, and a third lens portion through which the light emitted from the third light-emitting element passes

Methodology Applied
Scientific EffectRefraction: Refraction

Data Source

PatentUS20240305066A1Light-emitting device
Publication Date: 2024.09.12 NICHIA CORP
  • US20240305066A1 patent drawing
  • US20240305066A1 patent drawing
  • US20240305066A1 patent drawing

AI summary

A light-emitting device includes a base, first to third light-emitting elements, one or more reflective members, and a lens member. The second and third light-emitting elements are disposed on lateral sides of the first light-emitting element, respectively. The mounting surface of the base is warped such that positions where the second and third light-emitting elements are disposed are lower than a position where the first light-emitting element is disposed, and the light-emitting surfaces of the second and third light-emitting elements are located more on a front side than the light-emitting surface of the first light-emitting element, or the positions where the second and third light-emitting elements are disposed are higher than the position where the first light-emitting element is disposed, and the light-emitting surfaces of the second and third light-emitting elements are both located more on a back side than the light-emitting surface of the first light-emitting element.