Apparatus used for fabrication of printed circuit board

Abstract

The invention relates to an apparatus used for fabrication of a single-sided printed circuit board. The apparatus comprises a UV-light generating device and is characterized in that UV light emitted by the UV-light generating device is reflected by a first reflector and irradiates on a dodging system, after passing through a first field lens, a second field lens and a second reflector, uniform light spots formed by the dodging system irradiate on a photographic film on which an original pattern needing exposure is drawn, the original pattern on the photographic film is m times smaller than a pattern which actually forms on the printed circuit board, wherein m is more than 1, and the photographic film, as an object plane of an optical amplification system, forms an image on the printed circuit board to be exposed after the photographic film is amplified by the optical amplification system. The invention has the following advantages: a manner of multiplying-imaging of non-parallel light is employed; compared to conventional exposure machines, the apparatus provided in the invention enables utilization of a large-aperture curved reflector to be avoided, equipment processing difficulty to be reduced, cost to be lowered down and the volume of equipment to be reduced.

Description

technical field [0001] The present invention relates to a device for making single-sided or double-sided printed circuit boards. Background technique [0002] In the production of large-scale printed circuit boards, the transfer of printed circuit board patterns is mainly realized by exposure machines, and the quality and accuracy of printed circuit boards largely depend on the quality of exposure. The basic structure principle of the widely used exposure machine equipment is as follows: figure 1 As shown: the ultraviolet light source 11 condensed by the condensing cover is irradiated on the reflector 12 , and after being reflected by the reflector 12 , uniform projection is achieved through the uniform light system 13 . Usually, the homogenizing system 13 is composed of two fly-eye lenses. The uniform illumination light emitted from the homogenizing system 13 is then reflected by the collimating mirror 14a to form a parallel beam irradiated on the projection film 16 place...

AI Technical Summary

Problems solved by technology

Since the projection magnification of the current exposure machine cannot be changed, when the thermal expansion rate changes when replacing another batch of circuit boards, the line width size on the film must be recalculated and a new film must be printed for replacement, which will cause delays The production cycle increases the production cost

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