A preparation method and equipment for a high-uniformity light source dedicated to PCB surface ink exposure

Abstract

The invention discloses a making method of a special high-uniformity light source for PCB surface exposure. The making method comprises the following steps: 1, arranging a plurality of UV optical modules, wherein each of the UV optical modules comprises an UVLED chip and a condensing device; 2, arranging an area array, wherein the plurality of UV optical modules are arrayed in a parallel or offset manner to form a rectangular or approximate rectangular shape in the area of the area array in order to form an area array light source; 3, arranging a light source control system used for the brightness control or the fault monitoring of the area array light source; and 4, turning on a power supply to make the light source control system run, wherein the plurality of UV optical modules respectively emit square light spots, and superfluous illumination overlap areas and light leakage areas between adjacent UV optical modules are reduced or eliminated to maintain the high uniformity of the brightness of lights emitted by the light source in a whole irradiation range. The invention also discloses an apparatus of the special high-uniformity light source for the PCB surface exposure.

Description

technical field [0001] The invention relates to the technical field of high-uniformity light source of ultraviolet curing technology, optical technology and light source control technology, in particular to a preparation method and equipment of a high-uniformity light source specially used for ink exposure on PCB surface. Background technique [0002] In recent years, with the rapid development of electronic technology, the traditional mercury lamp exposure method used for surface ink curing in the PCB industry is facing challenges. Power consumption, high temperature and pollution problems such as the release of sulfur dioxide are in urgent need of industrial upgrading. [0003] At present, the use of UVLEDs to replace traditional mercury lamps has been put on the agenda. Its high efficiency energy saving and service life 50 times longer than mercury lamps are its biggest advantages. However, for now, the use of UVLEDs is technically immature. Problem, because although tra...

AI Technical Summary

Problems solved by technology

These companies all use UVLED combined with optical lens to produce circular spot, as attached figure 1 , attached figure 2 As shown, because the LED emits a circular light spot, almost all optical lenses are also circular, so the designed light spot is naturally circular, and the large-area exposure light source composed of multiple circular light sources Due to the serious overlapping of light spots, the uniformity is far lower than the requirement of 85%. It can only be used for the lowest-end solder mask exposure requirements. For the exposure of mid-to-high-end circuit boards, due to the low brightness uniformity of the light source, there may be overexposure or leakage exposure. , so that the manufactured PCB circuit is jagged, there is a potential short circuit or open circuit, and it cannot be used at all.

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