Five commonly used LED lamp voltages: white lamp 3.0-3.3V; Red light 1.8-2.2V; Blue light 3.0-3.2V; Green light 2.9-3.1V; Yellow indicator 1.8-2.0V.
LED light process:
1. Chip inspection. Microscopic inspection, whether there is mechanical damage on the surface of the material and pitting pits lockhill chip size and electrode size meet the process requirements whether the electrode pattern is complete.
2, LED expansion. Since the LED chip is still arranged closely after the slicing, the spacing is very small (about 0.1mm), which is not conducive to the operation of the post-process. The film of the bonded chip is expanded by a spreader, so that the spacing of the LED chip is stretched to about 0.6mm. Manual expansion can also be used, but it is easy to cause bad problems such as chip drop waste.
3, LED dispensing. Put silver glue or insulating glue on the corresponding position of the LED bracket. For GaAs, SiC conductive substrates, red light, yellow light, yellow green chips with back electrodes, silver glue is used. For blue and green LED chips on sapphire insulating substrate, insulating adhesive is used to fix the chip.
4, the difficulty of the process is the control of the dispensing amount, and there are detailed process requirements in the colloidal height and dispensing position. As silver glue and insulating glue have strict requirements in storage and use, remind: silver glue waking, stirring, use time are matters that must be paid attention to in the process.
5, LED rubber. In contrast to dispensing, the glue preparation is to use the glue preparation machine to first apply silver glue to the LED back electrode, and then install the LED with silver glue on the back of the LED holder. The efficiency of glue preparation is much higher than that of dispensing, but not all products are suitable for glue preparation process.
6, LED manual blade. The expanded LED chip (with or without glue) is placed on the jig of the spine table, the LED bracket is placed under the jig, and the LED chip is stabbed to the corresponding position one by one with a needle under the microscope. One advantage of manual blade and automatic mounting is that it is easy to change different chips at any time, and it is suitable for products that need to install multiple chips.
The flashlight is generally 18650 lithium battery, the voltage is 3.7V, the charging voltage is 4.2V. Common 18650 batteries are divided into lithium-ion batteries, lithium iron phosphate and nickel-metal hydride batteries. Voltage and capacity specifications are nickel-metal hydride battery voltage is 1.2V Common capacity is 2500MAH, lithium-ion battery voltage is 3.6V, lithium iron phosphate battery voltage is 3.2V, common capacity is 1500MAH-3100MAH.