CN201389654Y

CN201389654Y - Structure of PCB drilling pad

Info

Publication number: CN201389654Y
Application number: CN200920150105U
Authority: CN
Inventors: 李崇森
Original assignee: YURUI ELECTRONICS CO Ltd
Current assignee: YURUI ELECTRONICS CO Ltd
Priority date: 2009-04-28
Filing date: 2009-04-28
Publication date: 2010-01-27
Anticipated expiration: 2019-04-28

Abstract

The utility model relates to a structure of a printed circuit board (PCB) drilling pad, in particular to an improved structure of a drilling pad for increasing the good drilling rate of the PCB. The drilling pad provided by the utility model mainly forms by the combination of a hard layer and a soft layer, wherein the hard layer with a smooth surface forms by flattening and adhering a piece of paper impregnated with melamine resin to the outer layer surface of a wood fiber board, and then carrying out a hot pressing and solidification; the soft layer with a relatively larger thickness is formed by taking the wood fiber board as the heartwood supporting layer of the hard layer. By adopting the structure provided by the utility model, the good drilling rate of the PCB is increased and the waste rate of a drill bit is reduced, thereby achieving the purpose and efficiency of the utility model.

Description

The boring backing structure of printed circuit board (PCB)

Technical field

The utility model relates to a kind of boring backing structure of printed circuit board (PCB), and the structure of boring backing plate that relates in particular to a kind of improvement is to promote the good rate of boring of printed circuit board (PCB).

Background technology

Offer printed circuit board (PCB) processing factory at present, with the consumption material that must use in its lower pad in when boring as printed circuit board (PCB), not to adopt the urea plate to select wooden fine plate exactly for use, yet,, easily cause bit wear though be fit to use as backing plate because of urea plate quality is hard, and the urea plate is not good at if recycle, to easily cause environmental pollution, so the utmost point is necessary with regard to this consumptive material shortcoming, the substitute that is more suitable for searching.

Existing market is provided for the employed backing plate of processing printed circuit board, except the aforementioned urea plate of carrying, the wooden fine plate of use is still arranged as its backing plate, no doubt wooden fine plate belongs to nature material utmost point compliance with environmental protection requirements, but because of the fine plate quality of wood soft partially, cause when boring, the copper-clad surface of its printed circuit board (PCB) bottom surface layer because of the downforce that is subjected to bit drilled produces slight notch distortion and burr phenomenon down, therefore must be reprocessed to remove burr, when sand paper is worn, it still because of the effect of static magnetic, and easily blocks the boring that belongs to tiny bore through worn fines, causes increasing suddenly of fraction defective, be necessary in fact to seek suitable more substitute, to improve this shortcoming for this reason.

The utility model content

The purpose of this utility model provides a kind of boring backing structure of printed circuit board (PCB).

For reaching above-mentioned purpose, the boring backing structure of the utility model printed circuit board (PCB), become by hard layer and soft layer combination, wherein hard layer is that paper with the impregnation melmac is through the smooth superficies that are covered on wooden fine plate, form the hard layer of surface smoothing again through hot-press solidifying, wherein soft layer is with the heartwood supporting layer of the fine plate of wood as hard layer, with the bigger soft layer of relative formation thickness.

The structure of hard layer also can be adopted coating (coating) mode with the smooth superficies that are coated in wooden fine plate of melamine resin (melamine-formaldehyde resin), again through being heating and curing, to form the level and smooth hard layer of surperficial tool.The above-mentioned boring backing structure of the utility model has promoted the good rate of boring of printed circuit board (PCB).By the design of soft layer, can allow drill bit after reaching the purpose of boring, can alleviate its non-essential wearing and tearing simultaneously, and the coefficient of losses of this drill bit of reduction of appropriateness.

Description of drawings

The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,

Fig. 1 is a boring backing structure schematic diagram of the present utility model.

Fig. 2 is the utility model embodiment schematic diagram.

Description of reference numerals:

The boring backing plate 11-of 10-hard layer 12-soft layer

13-printed circuit board (PCB) 14-drill bit 15-copper-clad surface

The specific embodiment

Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast the description of drawings specific embodiment of the present utility model.

Seeing also Fig. 1 is boring backing structure schematic diagram of the present utility model, this boring backing plate 10 wherein, be that both are constituted by the soft layer 12 of the hard layer 11 of superficies and heartwood inside, and hard layer 11 adopts with the paper of impregnation melmac and is covered on wooden fine plate superficies through smooth, forms the hard layer of surface smoothing again through hot-press solidifying; 12 employings of soft layer have economy, the environmental protection supporting layer of nature again with the fine plate of wood as it.

Seeing also Fig. 2 is the utility model embodiment schematic diagram, wherein by the effect of the hard layer 11 of this surface smoothing and higher hardness, putting thereon when printed circuit board (PCB) 13, when under vertical, boring (also claiming boring) in order to top drill bit (also claiming drill bit) 14, can be smooth and driving fit and do not have the space, so can be and when printed circuit board (PCB) 13 was bored a hole by moment, can support and stop opening cruelly of its bottom Copper Foil 15 by its case hardness, anti-terminate in perforation around produce burr or distortion; Therefore when drill bit 14 finish smoothly hole and continue pierce through these hard layer 11 surfaces after, promptly contact wooden fine plate to the below supporting layer, while is by the design of soft layer 12, can allow drill bit 14 after the purpose that reaches boring, can alleviate its non-essential wearing and tearing, and the coefficient of losses of this drill bit 14 of reduction of appropriateness.

The utlity model has the wooden fine plate structure on hard layer surface, except the example structure of mentioned hard layer as described above, employing is covered on wooden fine plate superficies with the paper of impregnation melmac through smooth, again outside hot-press solidifying forms, but do not limit only as unique method, so long as can reach the scope that the same structure person of surface smoothing and hardness all belongs to the utility model structure, for example with the method for coating (coating) with the smooth superficies that are coated in wooden fine plate of melamine resin (melamine-formaldehyde resin), be the one example through being heating and curing with the hard layer that forms surface smoothing.

The above only is the schematic specific embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification all should belong to the scope that the utility model is protected.

Claims

1, a kind of boring backing structure of printed circuit board (PCB), described boring backing structure, combine by hard layer and soft layer, it is characterized in that: described hard layer is the smooth layer that is arranged on the superficies of wooden fine plate, and described hard layer is by the smooth superficies that are covered on wooden fine plate of the paper of impregnation melmac, constitute through hot-press solidifying; Described soft layer is with the heartwood supporting layer of the fine plate of described wood as described hard layer.