Multi-band optical exposure system, device and method

Abstract

The invention discloses a multi-band optical exposure system, device and method, and belongs to the technical field of printed circuit boards. The multi-band optical exposure system, device and methodseparate light sources of different wavelengths, the light sources of the different wavelengths are matched with corresponding optical devices, and the service life of the optical devices is prolonged. Exposure subsystems matched with the light sources of the different wavelengths are arranged at different positions of the multi-band optical exposure system in the scanning direction, so that thedifferent exposure subsystems can achieve the effect that photochemical reactions at different depths of a material or photochemical reactions with different photoinitiators have certain time intervals, the photochemical reactions are more sufficient, and a composite photosensitive material has better graphic gloss and higher definition. At the same time, the overall capacity and the working efficiency of the exposure device are improved.

Description

technical field [0001] The invention relates to a multi-band optical exposure system, equipment and method, and belongs to the technical field of printed circuit boards. Background technique [0002] Composite photosensitive material is a photosensitive material that can produce photochemical reactions to light sources of various wavelengths. In the printed circuit board (Printed Circuit Board, PCB) industry in the field of integrated circuits, the light-cured solder resist used in the solder resist process Ink, because it is doped with photoinitiators of various wavelengths, is a typical composite photosensitive material. The basic composition of PCB solder resist ink is: prepolymer, reactive diluent, photoinitiator, pigment, additives, etc. In the solder resist process, the ultraviolet (ultra-violet, UV) curing of PCB solder resist ink relies on the photoinitiator to absorb the radiation energy of the ultraviolet light source to form free radicals, triggering the crosslin...

AI Technical Summary

Problems solved by technology

[0004] The above method of using high-pressure mercury lamps has the disadvantages of rapid attenuation of the mercury lamp light source, limited service life, unstable energy output in the effective band, wide spectral distribution, and low energy utilization efficiency. Due to the high pressure, high temperature and strong radiation of the mercury lamp, It is easy to make the surrounding oxygen molecules react chemically and produce ozone, which will cause certain pollution; while the mixed light source method needs to design a complex coating layer, the coating layer has a low service life, and causes energy loss. The mixed light source passes through the same set When using an optical system, it will seriously reduce the life of the optical device, thereby increasing the input cost; at the same time, the upper limit of the exposure energy will be limited, the design of the optical system is complicated, and the complex structure will increase the assembly error; moreover, the composite photosensitive material is suitable for light sources of different wavelengths The reaction time is different. When light sources of different wavelengths are exposed to the solder resist ink through the optical system, there must be an incomplete reaction under the same reaction time, which leads to the gloss and clarity of the exposed graphics not meeting the requirements. , the scrap rate is high; if repeated exposures are repeated, it will lead to a decrease in production capacity and low work efficiency

Images