A light emitting diode (English: Light-Emitting Diode, referred to as LED) is a light energy into electrical energy capable of semiconductor electronic components. This kind of electronic component appeared as early as 1962. In the early days, it only emitted low-light red light. Later, it developed other versions of monochromatic light. The light that can be emitted today has spread all over visible light, infrared light and ultraviolet light, and the luminosity has increased to equivalent. The luminosity. The use is also used as an indicator light, display panel, etc.; with the continuous advancement of technology, light-emitting diodes have been widely used in displays, television lighting decoration and lighting. When we saw the shiny LED , we didn't see that the LED light-emitting diode needed a lot of program steps and technical requirements when assembling the production line. Let's talk about the laser welding machine technical requirements. White LED light-emitting diodes are very strictly forbidden in the process of soldering. Some tiny details will have a huge impact on the soldering of LED diodes. Therefore, the following requirements must be strictly observed during the soldering process of LED light-emitting diodes:
1. Workers must wear anti-static gloves, anti-static wrists, and electric soldering irons must be grounded. It is strictly forbidden to touch the two lead pins of white LEDs with bare hands . Since the white LED antistatic is 100V, and the people working on the table when the humidity is 60% to 90% of the body can damage the light emitting diode of the electrostatic crystal layer, working for some time (e.g. 10 hours) will fail diode (not Bright ) . In case of seriousness, it will immediately expire.
2 , the welding temperature is 260 ° C, 3 seconds. If the temperature is too high, it will burn out the chip if it takes too long. In order to better protect the LED , the LED colloid and the PC board should be kept at a distance of 2mm or more, so that the solder heat is dissipated in the pin.
3 , the normal operating current of the LED is 20mA (the Minnes 3014 patch is 30mA) , and small fluctuations in voltage ( such as 0.1V) will cause large fluctuations in current (10%-15%) . Thus, the circuit should be designed in different pairs of the LED current limiting resistor voltage drop, to ensure optimum operation LED. If the current is too large, the LED will shorten its life and the current will be too small to reach the required light intensity. Generally, suppliers will split the LEDs when they are delivered in batches , that is, the LED light intensity, voltage, and light color in the same package are consistent, and are indicated on the spectrometer.
( 1 ) Soldering iron soldering: soldering iron ( up to 30W) tip temperature does not exceed 300 °C ; soldering time does not exceed 3 seconds ; soldering position is at least 2 mm from the colloid .
( 2 ) Wave soldering: the maximum temperature of dip soldering is 260 °C ; the dip soldering time is no more than 5 seconds ; the dip soldering position is at least 2 mm from the colloid . LED welding curve pin forming method: 1 , must be 2 mm away from the gel to bend the bracket. 2 , stent formation must be done with a fixture or by a professional. 3 , the bracket forming needs to ensure that the pins and spacing are consistent with the circuit board. 4. Bracket forming must be completed before welding.
Cleaning: Special care must be taken when cleaning the gel with chemicals, as some chemicals can damage the surface of the gel and cause fading such as trichloroethylene, acetone, etc. It can be wiped and immersed in ethanol for less than 3 minutes at room temperature . Electrostatic protection Electrostatic and current surges will cause damage to LEDs . Use Instatic products such as protective tapes and gloves when using InGaN series products.
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long-term working temperature: -40 ° C -360 ° C
This braided expandable sleeving is lightweight, flexible and non-flammable, it will perform without deterioration in the most diverse and demanding environments.
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Nomex is designed for the protection of wires and cable bundles against flame, high temperatures and mechanical abrasion. It is used on a variety of applications in the military, railway, marine, aeronautical and electrical equipment industries.
1: 3 expansion ratio
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With a tensile strength of 90,000 psi and can withstand temperatures up to 700°F, the Nomex Braided Sleeving is known for its high flame resistance. Because of the smooth and soft material, Nomex is used to make fire resistant protective gear for individuals that work in extreme heat conditions.
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