CN215872022U

CN215872022U - Solder mask silk screen printing fretwork backing plate

Info

Publication number: CN215872022U
Application number: CN202121735629.2U
Authority: CN
Inventors: 何福权; 廖志云
Original assignee: Shenzhen Hemei Jingyi Semiconductor Technology Co ltd
Current assignee: Shenzhen Hemei Jingyi Semiconductor Technology Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-02-18
Anticipated expiration: 2031-07-28

Abstract

The utility model provides a solder mask silk-screen hollowed-out base plate, which comprises a base plate main body and more than one base plate bearing area arranged in the middle of the base plate main body, wherein more than one single drilling structure is arranged in the middle of the base plate bearing area, a process edge drilling area is arranged outside the base plate bearing area on the periphery of the base plate main body, a plurality of first through holes are arranged in the process edge drilling area, a plate splicing plate edge drilling area is arranged on the periphery of the base plate bearing area, a plurality of second through holes are arranged in the plate splicing plate edge drilling area, a hollowed-out area is arranged in the middle of the single drilling structure, the hollowed-out area comprises an independent hollowed-out area corresponding to a single plug hole and a sheet hollowed-out area communicated with a certain number of plug holes, a first air guide hole corresponding to the single plug hole is arranged in the independent hollowed-out area, and the sheet hollowed-out area is a groove with the upper surface lower than that of the base plate main body, the bottom of the groove is provided with a plurality of second air guide holes. The utility model can solve the problem of poor supporting force of the hollowed-out area of the base plate.

Description

Solder mask silk screen printing fretwork backing plate

Technical Field

The utility model relates to a substrate silk-screen structure, in particular to a solder-proof silk-screen hollowed-out base plate.

Background

With the development of IC carrier plates becoming faster and faster, packaging substrates are rapidly developing towards high density and refinement, solder mask process flows are becoming more important, and in the prior treatment, silk-screen printing, baking, exposure, development and UV processes, wherein in the silk-screen printing process, a silk-screen base plate is a screen printing plughole base plate, namely, a product is supported on the silk-screen base plate, a screen is attached to the upper surface of the product, printing ink is well mixed and poured into the screen, the table top is printed firstly, the thickness uniformity of the printing ink is checked, then a scraper is adjusted to be constant pressure or depth, the printed board surface is clear and uniform, and under the scraping of the scraper, the printing ink enters a through hole of the product through a silk screen to fill the hole of the product with the printing ink. The holes on the backing plate are drilled by a mechanical drilling machine, and the backing plate plays a role in supporting the product and filling the holes with the ink for ventilation in the process of filling the ink into the through holes of the product. However, for the area with dense plug holes, the area becomes hollow after the drilling process is completed, which causes the problem of poor supporting force, thereby causing the problem of oil accumulation in the screen printing plug holes at the position.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a solder-proof silk-screen hollowed-out base plate.

The utility model comprises a base plate main body, more than one substrate bearing area arranged in the middle of the base plate main body, more than one single drilling structure is arranged in the middle of the substrate bearing area, a process edge drilling area is arranged outside the substrate bearing area on the periphery of the base plate body, the drilling area of the technical edge is provided with a plurality of first through holes, the periphery of the substrate bearing area is provided with a board edge drilling area of the makeup board, the hole drilling area at the edge of the makeup board is provided with a plurality of second through holes, the middle part of the single hole drilling structure is provided with a hollow area, the hollow-out area comprises an independent hollow-out area corresponding to a single plug hole and a sheet-shaped hollow-out area communicated with a certain number of plug holes, the independent hollow area is provided with a first air guide hole corresponding to the plug hole, the sheet-shaped hollow area is a groove with the upper surface lower than the base plate main body, and the bottom of the groove is provided with a plurality of second air guide holes.

The utility model is further improved, and the first through hole comprises one or more of a pre-drilled hole, a positioning hole, a direction hole, a plating guiding hole, a plate number hole and a tail hole.

The utility model is further improved, the aperture of the pre-drilled hole is 2100um, the aperture of the directional hole is 3175um, the aperture of the lead-plating hole is 1500um, and the aperture of the plate number hole is 500 um.

The utility model is further improved, and the second through hole comprises one or more of a pipe position hole, a slotted hole and a through hole.

The utility model is further improved, the aperture of the pipe position hole or the slotted hole is 2500um-2550um, and the aperture of the conducting hole is 700um-1000 um.

The utility model is further improved, the independent hollow area comprises more than 1 independent hollow area, the flaky hollow area is provided with more than 1 flaky hollow area, the distance between two adjacent hollow areas is not less than 200um, and the distance between two adjacent second air guide holes is not less than 200 um.

The utility model is further improved, the base plate adopts an A-grade yellow light plate, the thickness of the base plate is 3mm, and the depth of the groove is 1/3-3/4 of the thickness of the base plate main body.

The utility model is further improved, the independent hollow-out area is a cylindrical through hole, and the aperture of the first air guide hole is 900-1000 um.

The utility model is further improved, and the whole shape of the flaky hollow-out area is a funnel shape with more than 1 through hole at the bottom.

The utility model is further improved, the aperture of the second air guide hole of the funnel-shaped single through hole of the sheet-shaped hollow area is 750-750 um, and the aperture of the second air guide hole of the funnel-shaped multi-through hole is 650-750 um.

Compared with the prior art, the utility model has the beneficial effects that: the dense area of the main body of the hollowed-out base plate is provided with the grooves, the problem of poor supporting force caused by a structure of the hollowed-out area of the base plate can be solved by the grooves, the air guide holes and the funnel-shaped through holes play a role in guiding air of the silk-screen base plate, the conventional silk-screen base plate cannot be connected with products with the plugs, the silk-screen base plate drilled by the method can still be used for silk-screen printing of products with the base plate hole number more than 15 thousands, particularly for green paint products, the base plate hole plugging and silk-screen printing mode is adopted, the yield of the green paint products is increased, the problem of no support when the silk-screen base plate with the holes with the number more than 15 thousands is drilled is solved, the problem of oil accumulation caused by the hollowed-out base plate is solved, and the problem of incomplete green paint hole plugging can be effectively avoided.

Drawings

FIG. 1 is a schematic view of the construction of the backing plate of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic view of a pad structure corresponding to a single substrate;

FIG. 4 is a schematic view of three structures of a second air hole;

fig. 5 is a schematic structural view of a second embodiment of the sheet-shaped hollow-out region.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1 to 5, the utility model includes a pad body 1, 10 closely arranged substrate supporting regions 3 arranged in the middle of the pad body 1, pnl process edge drilling regions 2 arranged on the periphery of the pad body outside the substrate supporting regions 3, and a plurality of first through holes 21 arranged on the pnl process edge drilling regions 2.

The middle part of the substrate bearing area 3 is 95 close single drilling structures 4, the periphery of the substrate bearing area 3 is provided with a packaging substrate strip makeup board edge drilling area, the packaging substrate strip makeup board edge drilling area is provided with a plurality of second through holes 31, the middle part of the single drilling structure is provided with a hollow area 41, the hollow area 41 comprises an independent hollow area 411 corresponding to a single plug hole and a sheet hollow area 412 communicated with a certain number of plug holes, the independent hollow area 411 is provided with a first air guide hole corresponding to the plug hole, the sheet hollow area 412 is a groove 4121 with the upper surface lower than the base plate main body 1, and the bottom of the groove is provided with a plurality of second air guide holes 4122.

The groove 4121 can solve the problem of poor supporting force caused by the structure of the hollowed-out area of the base plate, the small air guide hole can play a role in guiding air of the hollowed-out silk-screen base plate, and when the scraper scrapes green paint to fill the through hole of the packaging substrate, the situation that the hole is not fully plugged is effectively avoided.

The air guide holes and the air guide hole distance between the single drilling structure 4 are at least 200um, the independent hollow area 411 comprises more than 1 independent hollow areas, the sheet-shaped hollow area 412 is provided with more than 1 sheet-shaped hollow areas, the distance between two adjacent hollow areas is not less than 200um, and the distance between two adjacent second air guide holes is not less than 200 um. The distance cannot be too close, thereby ensuring the supporting effect. The single shadow part is a single mechanical drilling area diagram of the packaging substrate, the single pad drilling area is a part of the embodiment, each product is different, the design is inconsistent, and the hollow areas corresponding to the pads are also different. In addition, the number of the drilling structures 4 and the number of the substrate support areas 3 may be other numbers as required.

First through-hole 21 includes pre-drilling, locating hole, direction hole, draws plated hole, board number hole, tail hole, and the pre-drilling aperture of this example is 2100um, and direction hole aperture is 3175um, draws plated hole aperture to be 1500um, and board number hole aperture is 500 um. The model of each product is different, and the drilling area is also different.

The second through hole of this example includes pipe position hole or slotted hole and conducting hole, pipe position hole or slotted hole aperture are 2500um-2550um, and conducting hole aperture is 700um-1000um, and for the convenience of unifying, the conducting hole aperture of this example takes the multiple of one hundred, can be 700um or 800um or 900um or 1000 um.

The groove 412 of the present embodiment is formed by splicing blind holes corresponding to the substrate plug holes, the depth of the groove 412 is 1/3-3/4 of the thickness of the pad body 1, and the present embodiment is 2/3 of the thickness of the pad body 1.

The shape of the independent hollow area 411 is a cylindrical through hole, the aperture of the first air guide hole is 900um-1000um, and the independent hollow area can be set to 900um or 1000 um.

As shown in fig. 4, as an embodiment of the present invention, the shape of the sheet-shaped hollow area is a funnel shape with 1 or more through holes on the bottom. The distance between the through holes is not less than 200 um.

The second air hole 4122 of the funnel-shaped single through hole of the sheet-shaped hollow area has an aperture of 800um, and the second air hole 4122 of the funnel-shaped multi-through hole has an aperture of 700 um. The setting of second air guide hole is guaranteeing to ventilate under the prerequisite, can strengthen the holding power of backing plate main part, prevents that 1 fretwork of backing plate main part from not having the support, arouses the poor problem of holding power. The aperture of the second air guide hole with multiple through holes is slightly smaller, and the strength of the hollow area is effectively improved.

As shown in fig. 5, as a second embodiment of the present invention, the side wall of the groove 4121 of this embodiment is provided with an inclined surface 4123, and the triangular section resists torsional deformation, further improving the supporting strength of the sheet-shaped hollow area 412. The distance from the upper edge of the triangular bevel to the upper surface of the pad body 1 is preferably 1/3-2/3 of the thickness of the pad body 1, which is 1/3 in this example.

The machining process of the cushion plate main body 1 of the embodiment is as follows:

before drilling the cushion plate, the drilling data of the cushion plate needs to be made, in a single piece, 900um of a through hole r100um of a drl drilled belt layer is enlarged and copied to a dan cushion plate layer, then 500um of the through hole r100 is enlarged and copied to another layer of a layer as a reference layer, the dan layer is the current layer, drl drilled belt layer and a layer are the reference layer, a single edge hole is moved in a dan cushion plate layer, the edge of the hole of the dan cushion plate layer is overlapped with the hole of the r600um layer, the supporting force of the cushion plate is enlarged, and the main body area of the cushion plate is enlarged. At the Strip piece layer, with backing plate plywood limit pipe position hole, the slotted hole, the reference drl layer of via hole drilling aperture adds 700um or 800um or 900um, pnl layers will be technology limit locating hole greatly, the direction hole, the tail hole, the via hole, the reference drl layer of drilling aperture such as hanging hole adds 700um or 800um or 900um, wherein the model hole is 500um, in pnl piece, the interval is 1mm at least about between the adjacent base plate bearing region 3, the interval is 2-3mm at least about, the direction is adjusted according to the design requirement, the maximize utilizes the typesetting utilization ratio.

The base plate main body 1 is an A-level yellow material light plate, namely an FR-4 epoxy glass cloth plate, the length and width of the base plate are 610mm x 510mm, the thickness of the base plate is 3mm, the distance between the edge of the base plate and a single drilling area is at least 10-20cm, and the whole drilling area is arranged in the middle of the base plate main body, so that the edge of the circuit board can obtain sufficient bearing force. The funnel-shaped through hole is formed by combining a small air guide hole and a blind hole. The small air guide holes are through holes, the air guide effect of the base plate is achieved, the blind holes are mainly drilled and hollowed, and the base plate is guaranteed to have supporting force. The blind holes and the small air guide holes in the dense area are concentrated in the middle of the base plate main body. The depth of the blind hole in the hole plugging dense area is designed to be 2/3 of the thickness of the backing plate, so that the backing plate can be effectively prevented from deforming, and the small air guide hole can play a role in supporting and guiding air. Before the silk screen printing is used, a pneumatic grinding machine is required to be used for grinding, grinding machine sand paper 320 and 500# are used for grinding according to the analysis of the fingers, at least 5 minutes of grinding are carried out, the abrasion condition of the sand paper is checked in the process and timely replaced, the backing plate is required to be smooth and have no burr when being touched by a hand, and the backing plate can be used after being cleaned and dried after being qualified.

The conventional silk-screen base plate can not be connected with a product with a plug, the silk-screen base plate drilled by the method can still be used for silk-screen printing of the product with the base plate hole number more than 15 ten thousand, particularly for green paint products, the mode of base plate hole plugging silk-screen printing is adopted, the yield of the green paint products is increased, the problem that the multi-hole silk-screen base plate is drilled without support is solved, the problem that the hollow base plate causes oil accumulation is solved, and the situation that the green paint hole plugging is not full can be effectively avoided.

The above-described embodiments are intended to be illustrative, and not restrictive, of the utility model, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides a prevent welding silk screen printing fretwork backing plate which characterized in that: comprises a base plate main body, more than one substrate bearing area arranged in the middle of the base plate main body, more than one single drilling structure arranged in the middle of the substrate bearing area, the periphery of the base plate body is provided with a process edge drilling area outside the substrate bearing area, the process edge drilling area is provided with a plurality of first through holes, the periphery of the substrate bearing area is provided with a board edge drilling area of the jointed board, the board edge drilling area of the jointed board is provided with a plurality of second through holes, a hollow area is arranged in the middle of the single drilling structure, the hollow area comprises an independent hollow area corresponding to a single plug hole and a sheet-shaped hollow area communicated with a certain number of plug holes, the independent hollow area is provided with a first air guide hole corresponding to the plug hole, the sheet-shaped hollow area is a groove with the upper surface lower than the base plate main body, and the bottom of the groove is provided with a plurality of second air guide holes.

2. The solder mask silk-screen stencil backing plate of claim 1, wherein: the first through hole comprises one or more of a pre-drilled hole, a positioning hole, a direction hole, a plating guiding hole, a plate number hole and a tail hole.

3. The solder mask silk-screen stencil backing plate of claim 2, wherein: the pre-drilled hole diameter is 2100um, the direction hole diameter is 3175um, the lead plating hole diameter is 1500um, and the plate number hole diameter is 500 um.

4. The solder mask silk-screen stencil backing plate of claim 1, wherein: the second through hole comprises one or more of a pipe position hole, a slotted hole and a through hole.

5. The solder mask silk-screen stencil backing plate of claim 4, wherein: the aperture of the pipe position hole or the slotted hole is 2500um-2550um, and the aperture of the conducting hole is 700um-1000 um.

6. The solder mask silk-screen stencil shim plate of any one of claims 1 to 5, wherein: independent fretwork area includes independent fretwork district more than 1, slice fretwork area is equipped with the slice fretwork district more than 1, 200um is no less than to the interval between two adjacent fretwork districts, and 200um is no less than to two adjacent second air guide hole intervals.

7. The solder mask silk-screen stencil backing plate of claim 6, wherein: the base plate adopts A-level yellow plane, the thickness is 3mm, and the depth of the groove is 1/3-3/4 of the thickness of the base plate main body.

8. The solder mask silk-screen stencil shim plate of any one of claims 1 to 5, wherein: the shape of independent fretwork area is cylindrical through-hole, first air guide hole aperture is 900um-1000 um.

9. The solder mask silk-screen stencil shim plate of any one of claims 1 to 5, wherein: the shape of the flaky hollowed-out area is integrally funnel-shaped, and more than 1 through hole is formed in the bottom of the flaky hollowed-out area.

10. The solder mask silk-screen stencil backing plate of claim 9, wherein: the aperture of the second air guide hole of the funnel-shaped single through hole in the sheet hollow area is 750-750 um, and the aperture of the second air guide hole of the funnel-shaped multi-through hole is 650-750 um.