LED Lightbulb Adjustable Color Temperature via Rotating Diffuser
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Solution Overview
Problem
Existing LED lightbulbs with adjustable color temperature require removal from fixtures to change color temperature settings, which is inconvenient and inefficient.
Innovation Solution
An LED lightbulb with an integrated adjustable color temperature mechanism using a metal core printed circuit board (MCPCB) and a light diffusion unit with CCT buttons, allowing color temperature adjustment while the bulb is installed, utilizing a conductive pad or ball to close circuit pathways and adjust LED array intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slide switch is positioned on the side of the lighting housing for color temperature adjustment, then color temperature can be adjusted, but the switch becomes inaccessible when the bulb is installed in a fixture, requiring bulb removal for adjustment
Solution Approach 1:
The patent moves the color temperature adjustment mechanism from the lateral surface (2D plane) to the terminal end of the bulb (extending into 3D space). This dimensional relocation allows the switch to remain accessible even when the bulb is installed in a fixture, as the adjustment mechanism protrudes beyond the fixture housing.
Solution Approach 2:
The adjustment mechanism is pre-positioned at the bulb terminal, ready for operation without requiring bulb removal. The spring-loaded contact and rotatable member are预先 configured to engage with the fixture terminal, enabling direct adjustment at the installation location.
2Adaptability or versatility
If multiple LED arrays with different color temperatures are used, then color temperature tuning capability is achieved, but the circuit control complexity increases
Solution Approach 1:
The patent divides the LED lighting system into multiple independent LED arrays, each emitting a different color temperature (e.g., warm white and cool white). Each array has its own control circuit that can be independently adjusted, allowing flexible color temperature tuning by selectively controlling the intensity of each segment.
Solution Approach 2:
The patent implements dynamic control of LED array intensities through a variable resistor or dimmer circuit. This allows the relative contribution of each LED array to be continuously adjusted, enabling smooth color temperature transitions from warm to cool white by changing the electrical resistance and thereby the current distribution among arrays.
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 seamless adjustment of color temperature without removing the lightbulb from fixtures, enhancing user convenience and operational efficiency.
Implementation Method 1
A light-emitting diode (LED) is a two-lead semiconductor light source. It is a pn-junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.
Implementation Method 2
The MCPCB also includes multiple color corrected temperature (CCT) buttons that form a CCT switch. Each of the CCT buttons are in electrical communication with an internal LED driver unit and the LED arrays or LED tracks on the MCPCB through the appropriate circuitry and contacts, such that actuation of one of CCT buttons controls the combined intensity outputs of the at least two different LED arrays or LED tracks on the MCPCB to emit a selected total corrected light color temperature light.
Data Source
AI summary
An LED lightbulb is disclosed. The LED lightbulb includes at least two sets of LEDs that emit two different color temperature light and that are located on a metal core printed circuit board. The combine intensity outputs of the at least sets of LEDs generate a selected corrected color temperature output. The corrected color temperature output is changed by rotating a diffusing unit with a conductive contact pad that engages contact tracks on color corrected temperature (CCT) buttons and thereby closing a circuit corresponding to a selected corrected color temperature output.