阅读说明：本技术 一种凸台作为焊盘的电路板的制作方法 (A kind of production method of the circuit board of boss as pad ) 是由 张成立 徐光龙 王强 李东海 茆昊奇 黄礼树 于 2019-08-30 设计创作，主要内容包括：一种凸台作为焊盘的电路板的制作方法,步骤：开料、减铜；钻孔；沉铜；压膜；曝光、显影；线路电镀；压膜；曝光、显影；焊盘电镀；脱膜、退铜；压合绝缘层；研磨：对绝缘层的表面进行研磨直至露出焊盘,顶层/底层焊盘开窗形成。本发明采用热固性绝缘材料,成本低,且无需丝印,绿色环保,同时制作工艺简单、易操作,焊盘直接通过研磨制作,更有利于制作面积小、密度大的焊盘,制备的电路板表面平整,利于精密封装,且线路附着牢固,质量好。(A kind of production method of the circuit board of boss as pad, step: sawing sheet subtracts copper；Drilling；Heavy copper；Press mold；Exposure, development；Route plating；Press mold；Exposure, development；Pad plating；Demoulding moves back copper；Press insulating layer；Grinding: grinding is carried out to the surface of insulating layer until exposed pad, top/bottom pad open a window to be formed.The present invention uses heat cured insulation material, it is at low cost, and it is not necessarily to silk-screen, it is environmentally protective, while manufacture craft is simple, easy to operate, pad directly passes through grinding production, it is more advantageous to the production pad that area is small, density is big, the circuit board surface of preparation is smooth, is conducive to accurate encapsulation, and route adhesion-tight, it is high-quality.)

1. a kind of production method of boss as the circuit board of pad, it is characterised in that the following steps are included:

1) sawing sheet, subtract copper: substrate blanking, and be thinned substrate surface layers of copper；

2) it drills: drilling in the position for needing interlayer conduction；

3) one layer of conductive layers of copper heavy copper: is deposited on hole wall insulating layer；

4) press mold；

5) it exposes, develop；

6) route is electroplated；

7) press mold；

8) it exposes, develop；

9) pad is electroplated；

10) demoulding, move back copper: demoulding, which refers to, removes dry film, and line pad is formed；It moves back copper and refers to and remove remaining copper on substrate；

11) insulating layer is pressed；

12) it grinds: grinding being carried out to the surface of insulating layer until exposed pad, top/bottom pad open a window to be formed.

2. manufacturing method according to claim 1, it is characterised in that: the substrate of the step 1) be lamina, multi-layer board, Rigid Flex or hardboard.

3. manufacturing method according to claim 1, it is characterised in that: the drilling of the step 2) is through-hole or blind hole.

4. manufacturing method according to claim 1, it is characterised in that: the step 4), step 7) press mold refer to pressure sensitivity The dry film of light.

5. manufacturing method according to claim 1, it is characterised in that: exposure, the development of the step 5) are to remove addition The dry film of place on line.

6. manufacturing method according to claim 1, it is characterised in that: exposure, the development of the step 8) are to remove weldering The dry film of disk position.

7. manufacturing method according to claim 1, it is characterised in that: the insulating layer of the pressing insulating layer of the step 11) Refer to a kind of intensity height, good insulating, filling heat cured insulation material that is good, not needing photosensitive technique.

8. manufacturing method according to claim 1, it is characterised in that: after subtracting copper in the step 1), remaining layers of copper is thick Degree is 1~2um.

9. manufacturing method according to claim 1, it is characterised in that: the copper that sinks in the step 3) makes to sink on hole wall insulating layer The layers of copper that product a layer thickness is 0.3~1.0um.

Technical field

The invention belongs to circuit board making technical fields, are related to a kind of circuit board more particularly to a kind of boss as pad Circuit board production method.

Background technique

With the continuous progress of technology, higher and higher to the functional requirement of electronic product.Circuit board is past during the preparation process Toward needing to make boss as pad, existing production method is as shown in Figure 1, its process are as follows: sawing sheet (10 blanking of substrate) → brill Hole 20 → heavy copper (one layer of conductive layers of copper 30 is deposited on hole wall insulating layer) → copper facing (thickeies hole copper thickness and face copper thickness 300) → press mold (dry film 40 of pressure sensitivity light) → exposure, development (dry film 40 for removing logicalnot circuit region) → etching (are removed non-thread The layers of copper in road region) → striping (removing dry film 40, route is formed) → welding resistance silk-screen (circuit surface pass through wire mark be coated with one layer Photosensitive-ink 70) exposure of → welding resistance, development (removing the ink 70 of welding disking area, form pad windowing position, then solidify).In In preparation process, have the following deficiencies:

One, the formation needs of pad windowing use photosensitive-ink, the other material of ad eundem, resistance toization of photosensitive technique itself Difference of the property than direct thermosetting process；Height is dissolved out in the process of surface treatment organic matter of rear process in this way, reduces surface treatment The service life of liquid medicine, to increase cost；

Two, the photosensitive-ink of welding resistance is needed using silk-screen printing, and the solid waste of ink needs to handle, and halftone needs to clean and locate Reason, not environmentally；

Three, the resist thickness uniformity of screen printing process is poor, generally in ± 10um, and surface irregularity, there can be bumps Uneven phenomenon；

Four, the copper surface after opening a window is easy residual ink in invisible ink technique, leads to subsequent surface treatment procedure Bond pad surface can not go up plating；

Five, unavoidably there is lateral erosion situation at windowing edge, and ink is thicker, and lateral erosion is bigger；

Six, the rigidity of photosensitive-ink material is low, and glassy state temperature inversion point is low, causes product in the thermal expansion of high temperature process Degree is high, is unfavorable for high-accuracy packaging technology；

Seven, because welding resistance exposure aligning is there are tolerance, it is unfavorable for the pad production that area is small, density is big.

Therefore, it is necessary to develop a kind of simple process, boss at low cost as the production method of pad to meet production Needs.

Summary of the invention

A kind of circuit technical problem to be solved by the invention is to provide simple process, boss at low cost as pad The production method of plate.

The technical scheme of the invention to solve the technical problem is: a kind of system of boss as the circuit board of pad Make method, it is characterised in that the following steps are included:

1) sawing sheet, subtract copper: substrate blanking, and be thinned substrate surface layers of copper；

2) it drills: drilling in the position for needing interlayer conduction；

3) one layer of conductive layers of copper heavy copper: is deposited on hole wall insulating layer；

4) press mold；

5) it exposes, develop；

6) route is electroplated；

7) press mold；

8) it exposes, develop；

9) pad is electroplated；

10) demoulding, move back copper: demoulding, which refers to, removes dry film, and line pad is formed；Move back copper refer to remove it is remaining on substrate Copper；

11) insulating layer is pressed；

12) it grinds: grinding being carried out to the surface of insulating layer until exposed pad, top/bottom pad open a window to be formed.

As an improvement, the substrate of the step 1) is lamina, multi-layer board, Rigid Flex or hardboard.

It improves again, the drilling of the step 2) is through-hole or blind hole.

Further, the step 4), step 7) press mold refer to the dry film of pressure sensitivity light.

Further, the exposure, development of the step 5) are the dry films for removing addition place on line.

Further, the exposure, development of the step 8) are the dry films for removing pad locations.

Preferably, remaining copper layer thickness is 1~2um after subtracting copper in the step 1).

Preferably, heavy copper makes the copper for depositing 0.3~1.0um of a layer thickness on hole wall insulating layer in the step 3) Layer.

Finally, the insulating layer of the pressing insulating layer of the step 11) refers to that a kind of intensity height, good insulating, filling are good, no Need the heat cured insulation material of photosensitive technique.

Compared with the prior art, the advantages of the present invention are as follows: it directlys adopt heat cured insulation material and is used as pressing insulating layer, The same of cost is being reduced without the use of the chemical liquid material such as ink, developer solution and halftone technique without silk-screen printing welding resistance When, it is also environmentally protective；Heat cured insulation material has the characteristic that modulus is high, glassy state temperature inversion point is high, thermal expansion coefficient is low, So that deforming in encapsulation process, small, intensity is high, is conducive to accurate encapsulation；Using the technique of surface grinding, noresidue on pad, Plating rate is high in the surface treatment of post-order process, while within the reachable ± 2um of the uniformity of thickness of insulating layer, and either on line also It is the region between line, surfacing, no concave-convex injustice；Pad side wall is combined closely with insulating materials, existing without lateral erosion at windowing As, and pad side wall also has insulating layer, considerably increases the pulling capacity of pad, to increase the push-pull effort of part；Pad Size depends on the diameter of copper post plating, and opens a window without exposure development, and directly grinding production not to potential difference, is more advantageous to The production pad technique that area is small, density is big.The present invention has the characteristics that simple process is reasonable, at low cost, high-quality.

Detailed description of the invention

Fig. 1 is the process flow chart of conventional production method, wherein (1) is sawing sheet, (2) are drilling, and (3) are heavy copper, and (4) are Copper facing, (5) are press mold, and (6) are exposure, development, and (7) are etching, and (8) are striping, and (9) are welding resistance silk-screen, and (10) are welding resistance exposure Light, development；

Fig. 2 is process flow chart of the boss provided by the invention as the production method of pad, wherein (1) is sawing sheet, (2) To subtract copper, (3) are drilling, and (4) are heavy copper, and (5) are press mold, and (6) are exposure, development, and (7) are route plating, and (8) are press mold, It (9) is exposure, development, (10) are pad plating, and (11) are demoulding, and (12) are to move back copper；(13) insulating layer is filled, and (14) are to grind Mill.

Specific embodiment

The present invention will be described in further detail below with reference to the embodiments of the drawings.

As shown in Fig. 2, a kind of production method of boss as the circuit board of pad, comprising the following steps:

1) sawing sheet: 1 blanking of substrate, substrate 1 can be lamina, multi-layer board, Rigid Flex or hardboard, such as Fig. 2 (1)；

2) subtract copper: the layers of copper 11 on 1 surface of substrate is thinned, after subtracting copper, remaining layers of copper 11 is with a thickness of 1~2 μm, such as Fig. 2 (2)；

3) it drills: in the position drilling 3 for needing interlayer conduction, such as Fig. 2 (3)；

4) heavy copper: one layer of conductive layers of copper 3 is deposited on hole wall insulating layer, with a thickness of 0.3~1.0 μm, such as Fig. 2 (4)；

5) press mold: the dry film 4 of pressure sensitivity light, 1 surface of substrate pressure on can be photosensitive dry film 4, such as Fig. 2 (5)；

6) it exposes, develop: removing the dry film 4 on addition place on line, such as Fig. 2 (6)；

7) route is electroplated, and powers in the position for removing dry film 4 and plates route 7, such as Fig. 2 (7)；

8) press mold, the dry film 40 of pressure sensitivity light prepare the upper photosensitive dry film 40 of circuit board surface pressure, dry film in step 7) 40 can be same dry film with dry film 4, such as Fig. 2 (8)；

9) it exposes, develop: removing the dry film 40 of 5 position of pad, such as Fig. 2 (9)；

10) pad is electroplated, and powers in the position for removing dry film 40 and plates pad 5, such as Fig. 2 (10)；

11) demoulding: removing dry film 40, and line pad is formed, and dry film 40 is usually dissolved using sodium hydroxide solution, such as Fig. 2 (11)；

12) it moves back copper: removing remaining copper on substrate, usually removed using microetch method (such as sulfuric acid+hydrogen peroxide series) Seed copper, such as Fig. 2 (12)；

13) press insulating layer 6: insulating layer 6 refer to a kind of intensity height, good insulating, fill it is good, do not need photosensitive technique Heat cured insulation material, this material generally has epoxy resin series, BT resin series (BT=polybismaleimide+cyanogen Acid esters, injection molding resin series etc., according to the material of the application demand of different product collocation different formulations, such as Fig. 2 (13)；

14) it grinds: grinding is carried out up to exposed pad 5 to the surface of insulating layer 5, the windowing of top/bottom pad 5 is formed, Such as Fig. 2 (14).

The present invention is achieved in advantage that:

One, heat cured insulation material is directlyed adopt, endurance is good, and dissolution is small, reduces surface treatment, reduces cost；

Two, heat cured insulation material is directlyed adopt, silk-screen printing welding resistance is not necessarily to, without the use of chemistry such as ink, developer solutions Liquid material and halftone technique reduce cost, and avoid having pollution, smell, and insalubrious object using net washing water is this Material；

Three, using the technique of surface grinding, noresidue on pad, plating rate is high in the surface treatment of post-order process；

Four, using the technique of surface grinding, within the reachable ± 2um of the uniformity of thickness of insulating layer, and either on line also It is the region between line, surfacing, no concave-convex injustice；

Five, pad side wall and insulating materials are combined closely, and without side etching phenomenon at windowing, and pad side wall also has insulating layer, The pulling capacity of pad is considerably increased, to increase the push-pull effort of part；

Six, because this technique uses heat cured insulation material, so material has, modulus is high, glassy state temperature inversion point is high, The low characteristic of thermal expansion coefficient, so that deforming in encapsulation process, small, intensity is high, is conducive to accurate encapsulation；

Seven, the material similar with packaging technology may be selected in surface insulation layer, can increase in this way encapsulating material and wiring board it Between binding force reduce the deformation quantity of encapsulation process to increase the performance of product, and thermal expansion coefficient can correspond to proportion；

Eight, the size of pad depends on the diameter of copper post plating, and opens a window without exposure development, and directly grinding production does not have Have and is more advantageous to the production pad technique that area is small, density is big to potential difference.

Nine, using the pressing copper foil of material itself, subtract copper to 1~2um by whole plate, as the seed copper of addition route, Directly pressing copper foil binding force is better than conventional heavy copper as seed process for copper, and which enhances the adhesive force of route.