LED Lamp Light Angle Adjuster Filter Cutoff
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Solution Overview
Problem
Conventional light emitting diode (LED) lamps with band-pass filters struggle to effectively cut off visible light rays due to incident angle dependency, leading to incomplete light blocking, especially when the divergence angle of LED emissions exceeds the filter's cutoff capability.
Innovation Solution
Incorporating a light angle adjuster, such as a reflective surface defined by a paraboloid of revolution, and a band-pass filter to ensure that emitted light rays are incident within the filter's maximum effective angle, along with a light shield to block rays at larger angles, thereby reducing unwanted wavelength emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-pass filter is used to cut off visible light rays from LED emissions, then the light blocking function is improved for narrow angles, but the effectiveness deteriorates when light rays incident at angles greater than the maximum incident angle
Solution Approach 1:
The solution segments the light control function into two parts: the band-pass filter handles narrow-angle light rays (within maximum incident angle) to block visible wavelengths, while the light shield handles wide-angle light rays (exceeding maximum incident angle) separately. This segmentation allows each component to operate within its effective range, solving the contradiction between narrow-angle filtering effectiveness and wide-angle coverage.
2Area of stationary object
If the divergence angle of LED emissions is large, then the lighting coverage is improved, but the band-pass filter cannot effectively block visible light rays at large incident angles
Solution Approach 1:
The light shield acts as an intermediary component between the LED and the band-pass filter. It pre-processes the wide-angle light rays by blocking them before they reach the band-pass filter, allowing the filter to focus on filtering visible wavelengths within its effective angle range. This intermediary structure enables both large light coverage and effective visible light blocking.
3Manufacturing precision
If a band-pass filter with optical thin film is used to achieve definite boundary wavelength cutoff, then the wavelength selectivity is improved, but the incident angle dependency becomes more remarkable
Solution Approach 1:
The system segments the angular spectrum into two zones: narrow angles handled by the high-precision band-pass filter with optical thin film for accurate wavelength cutoff, and wide angles handled by the light shield. This segmentation allows the optical thin film filter to operate at its full precision potential without being compromised by incident angle dependency, while still achieving broad angular coverage through the combined system.
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 significantly reduces the chances of emitting undesired wavelengths by aligning light rays with the band-pass filter's cutoff function, enhancing light blocking efficiency and preventing visible light leakage.
Implementation Method 1
The light angle adjuster is a reflector including a reflective surface defined by a paraboloid of revolution
Implementation Method 2
the band-pass filter tends to be unable to exert a light blocking (cutoff) function with respect to light rays incident on the band-pass filter at incident angles of greater than a predetermined angle
Data Source
AI summary
A light emitting diode lamp is composed of a light emitting diode, a band-pass filter and a light angle adjuster. The filter has a light cutoff function to cut off a light ray with a specific wavelength. The light angle adjuster allows the light rays emitted from the diode to be incident on the filter at incident angles of less than or equal to a maximum incident angle up to which the filter is capable of exerting the light cutoff function. The light angle adjuster is a reflector. The diode is mounted to a bottom portion. The filter is mounted to an opening. On an imaginary cross section including the optical axis, an angle formed between the optical axis and a straight line is less than or equal to the maximum incident angle, the straight line connects the emission center and an edge of the opening.