Field Emission Lamp Single-End Encapsulation Design
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Solution Overview
Problem
Conventional field emission lamps have a complex and time-consuming encapsulation process due to the need to seal both ends, resulting in high production costs.
Innovation Solution
A field emission lamp design with only one open end for encapsulation, featuring a glass tube with a carbon nanotube cathode filament, an Indium Tin Oxide anode layer, and getters for gas absorption, simplifying the encapsulation process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both ends of the glass tube are encapsulated in conventional field emission lamps, then the lamp structure is complete and functional, but the encapsulation process becomes complex and time-consuming, increasing production cost
Solution Approach 1:
The invention extracts the encapsulation requirement from one end of the lamp by designing an open-end structure. The encapsulation board with sealing ring and support ribs provides sufficient sealing and structural support at only one end, eliminating the need for complex dual-end encapsulation while maintaining lamp functionality and reliability.
2Reliability
If both ends of the glass tube are encapsulated in conventional field emission lamps, then the lamp structure is complete and functional, but the encapsulation procedure becomes complicated, increasing manufacturing complexity
Solution Approach 1:
The invention removes the encapsulation requirement from one end of the lamp by designing an open-end structure. The encapsulation board with sealing ring and support ribs provides sufficient sealing and structural support at only one end, significantly simplifying the encapsulation procedure and reducing manufacturing complexity while maintaining lamp functionality.
Solution Approach 2:
The invention introduces asymmetry in the lamp structure by having one encapsulated end and one open end. The encapsulation board is positioned asymmetrically to provide all necessary sealing and support functions, eliminating the need for symmetric dual-end encapsulation and simplifying the overall manufacturing process.
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
Simplifies the manufacturing process and reduces costs by requiring encapsulation of only one end, enhancing production efficiency and making the lamp more economically viable.
Implementation Method 1
an appropriate negative voltage is applied to the cathode down-lead pole 242, thereby forming a strong field along the surface of the cathode 24. The strong field excites the carbon nanotubes on the surface of the cathode 24 to emit electrons
Implementation Method 2
the electrons bombard the phosphor layer 23 on the inner surface of the glass tube 20, thereby producing visible light
Implementation Method 3
the getters 29 are used to absorb residual gas in the glass tube 21
Data Source
AI summary
A field emission lamp (30) includes a tube (31) having a closed end and an open end, an encapsulation board (38) mated with the open end, an anode layer (32) formed on an inner surface, a fluorescence layer (33) formed on the anode layer, a cathode down-lead pole (342) located at the encapsulation board, a cathode fixing pole (341) located at the closed end, a cathode filament (34) having a carbon nanotube layer formed on a surface thereof fixed between the cathode down-lead pole and the cathode fixing pole, an anode down-lead ring (321) located at the anode layer near the open end, and an anode down-lead pole (322) located at the encapsulation board and electrically connected with the anode down-lead ring. The field emission lamp has a simple structure, thereby having an enhanced production rate and a reduced cost.