Annular Camera Flash Lens for LED Light Concentration
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Solution Overview
Problem
Existing camera flash systems with LEDs face challenges in efficiently concentrating light within the camera's angle of view due to the wide angle of radiation from LEDs, which is not easily aligned with the camera's field of view, especially when using multiple LEDs, leading to complex structures and reduced light emission efficiency.
Innovation Solution
A camera flash lens system comprising annular lenses with edge portions extending towards a board to reflect and collect light from LEDs, featuring a Fresnel or curved central portion to concentrate light within the camera's view, formed from acrylic material to facilitate manufacturing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an LED is used as a light source of a camera flash, then the flash can be compact and energy-efficient, but the wide angle of radiation (120° to 130°) does not match the camera's angle of view (56° width and 48° length)
Solution Approach 1:
The flash lens is divided into multiple annular lenses, each corresponding to a specific LED. Each annular lens has a different optical power tailored to its associated LED's position and radiation characteristics, allowing precise control of light distribution from each LED to match the camera's angle of view.
Solution Approach 2:
Different regions of the flash lens have different optical properties. The annular lenses have varying optical powers depending on their position relative to the LEDs, with the optical power being highest for LEDs at the center and lower for LEDs at the periphery. This local differentiation optimizes light concentration for each LED while maintaining overall system performance.
2Adaptability or versatility
If exterior cover and reflector are used to adjust the angle of radiation, then light direction can be controlled, but the structure becomes complicated
Solution Approach 1:
The flash lens integrates multiple functions into a single component. It combines the light concentration function, angle adjustment function, and LED protection function into one integrated lens assembly, eliminating the need for separate exterior covers and reflectors while achieving the same or better performance.
Solution Approach 2:
The annular lens structure serves multiple purposes simultaneously: it concentrates light from each LED, controls the radiation angle to match the camera's field of view, protects the LED chips, and provides a compact mounting structure. This multi-functionality reduces the overall device complexity.
3Illumination intensity
If a flash lens is designed to narrow the angle of radiation from 120° to 130° to 56° width and 48° length, then light concentration within the camera's angle of view improves, but manufacturing precision requirements increase
Solution Approach 1:
By dividing the lens into multiple annular segments, each with a specific optical power, the design allows for more tolerant manufacturing of individual segments compared to a single complex lens. The segmented structure simplifies the fabrication process while achieving the required light concentration and angle control.
Solution Approach 2:
The optical power of each annular lens is carefully optimized based on the position of its corresponding LED. This parameter optimization allows the system to achieve high light concentration efficiency with relaxed manufacturing tolerances, as each annular lens is designed for its specific functional requirement rather than requiring uniform precision across the entire lens.
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 effectively narrows the angle of radiation from LEDs to match the camera's view, enhancing light concentration and intensity within the camera's field of view, even with multiple LEDs, using a simple and efficient lens structure.
Implementation Method 1
an edge portion extending toward the board to reflect and collect light emitted from an edge of a corresponding LED
Implementation Method 2
a central portion having an inner surface with a Fresnel shape or a curved shape to collect light emitted from a top of the corresponding LED
Data Source
AI summary
A camera flash lens for a plurality of light emitting diodes (LEDs) mounted on a board and serving as a light source of a camera flash, includes a plurality of annular lenses corresponding to the plurality of LEDs, respectively. The plurality of annular lenses each include an edge portion extending toward the board to reflect and collect light emitted from the edge of a corresponding LED of the plurality of LEDs, and a central portion having an inner surface with a Fresnel shape or a curved shape to collect light emitted from the top of the corresponding LED.