Light Source Assembly Lens Modulates 180° Emission Angle
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Solution Overview
Problem
Current alarm devices, particularly fire alarms, have a limited light emission angle, resulting in a significant 'blind area' where people may not receive timely alarm information, posing a safety hazard due to low light intensity beyond the emission range of LEDs.
Innovation Solution
A light source assembly with a lens that modulates visible light to achieve a broader emission angle of up to 180°, ensuring light intensity remains above certain percentages within specific angular ranges, and includes a seal ring to protect the light source from environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If LED is used as light source for alarm device, then energy consumption is reduced and service life is extended, but light emission angle is limited to 20°-45° causing blind areas
Solution Approach 1:
A lens is introduced as an intermediary component between the LED light source and the environment. The lens modulates the visible light emitted by the LED to conform to a preset light distribution curve, expanding the emission angle from 20°-45° to 180° while maintaining the energy efficiency of LED.
Solution Approach 2:
The light distribution parameters are changed by using a lens to modulate the light. The lens transforms the narrow beam pattern of the LED into a wide-angle distribution pattern, achieving 180° visibility while maintaining LED's low energy consumption characteristics.
2Reliability
If LED with heat dissipation design is used, then reliability is improved, but emission angle increases to 45°-90° or 120° which still leaves blind areas
Solution Approach 1:
The lens acts as a mediator that takes the light from the heat-dissipating LED (which emits at 45°-90° or 120°) and redistributes it to achieve uniform 180° coverage, eliminating remaining blind areas while preserving the reliability benefits of heat dissipation design.
3Area of moving object
If lens is added to expand light emission angle, then alarm reception area is expanded, but device complexity increases
Solution Approach 1:
A single lens component serves as the intermediary to achieve 180° light distribution. This simple optical element expands the alarm reception area to cover all directions without requiring complex multi-LED arrays or mechanical scanning mechanisms, thus minimizing device complexity.
4Reliability
If seal ring is added to protect light source from harmful gases, then reliability in harsh environment is improved, but device complexity increases
Solution Approach 1:
A seal ring, representing a simple sealing structure, is used to protect the light source from harmful gases in harsh environments. This thin sealing element provides reliable environmental protection without adding significant complexity to the device.
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 expands the alarm reception area, improving safety by ensuring that a broader audience receives the alarm signal, even in the presence of harmful gases, and maintaining light intensity across various angles.
Implementation Method 1
a lens arranged on an emission path of the light source and configured to modulate the visible light emitted by the light source to conform to a preset light distribution curve
Data Source
AI summary
The present invention provides a light source assembly applied to an alarm device, which comprises a base; a light source arranged on the base and configured to emit visible light; and a lens arranged on an emission path of the light source and configured to modulate the visible light emitted by the light source into a light distribution curve conforming to the presetting. According to the light source assembly and the alarm device including the same in the embodiment of the present invention, the light emitted by the light source is modulated through the lens, so that the angle of emission of the light source assembly and the alarm device can be fully expanded. Especially when the light source assembly and the alarm device are applied to fire-fighting devices, the alarm reception blind area can be effectively reduced, and the safety level is improved.