CN209534442U - One kind is for improving the remaining halftone shelves point of VIA through-hole ink - Google Patents

Abstract

The utility model relates to a screen block for improving VIA through-hole ink residue. There are 8 stalls evenly arranged on the edge of the stalls, and the stalls are all triangular. A rectangular stall is set between two adjacent stalls. The width of the stall is a, and the lengths of the two symmetrical stalls are b, a and The size of b is related to the aperture D of the VIA through hole, and the value range of a is b+2. The utility model is simple in structure and compact in design. The size of the rice-shaped stalls used can be modified by adjusting the length and width of the rectangle. Variety of via vias.

Description

A screen dot for improving VIA through-hole ink residue

technical field

The utility model relates to a screen block for improving VIA through-hole ink residue, which belongs to the technical field of circuit board design.

Background technique

With the rapid development of electronic products, many special products correspond to special needs. Traditional circuit board design is difficult to meet some special needs, such as: heat dissipation of QFN chips, soldering of plug-in parts, if the traditional way of manufacturing is used VIA through holes with small apertures generally have a diameter of 9.8~15.7mil and a plate thickness of 60mil or above. If ordinary gear design is required, there will be a lot of ink in the VIA hole, which is not conducive to developing and punching. If the ordinary The diameter of the gear point design will cause problems such as copper leakage at the orifice.

Utility model content

The purpose of the utility model is to solve the problem, providing a simple structure and compact design for improving the ink residue of VIA through-hole screen stalls.

The utility model adopts the following technical scheme: a screen stall for improving VIA through-hole ink residue, the edge of the stall is evenly provided with 8 stalls, and the stalls are all triangles, and the adjacent A rectangular bracket is arranged between the two stalls, the width of the bracket is a, the length of the two symmetrical brackets is b, the size of a and b is related to the aperture D of the VIA through hole, and a The value range of is b +2.

Further, the stalls are in the shape of a rice.

Further, when the via hole diameter D of the VIA is less than 9.8 mil, b is 4 mil, and a is 6 mil.

Further, when the via hole diameter of VIA is 9.8<D≤14.8, b is 5 mil, and a is 7 mil.

Further, when the via hole diameter of VIA is 14.8<D≤19.8, b is 6 mil, and a is 8 mil.

Further, when the via hole diameter of VIA is 19.8<D≤24.8, b is 7 mil, and a is 9 mil.

Further, when the via hole diameter of VIA is 24.8<D≤29.8, b is 8mil, and a is 10mil.

Further, when the via hole diameter of VIA is 29.8<D≤34.8, b is 9 mil, and a is 11 mil.

Further, when the via hole diameter of the VIA is 34.8<D≤39.8, b is 10 mil, and a is 12 mil.

Furthermore, the design process of the stalls includes the following steps:

(1) First, according to the aspect ratio of the section of the VIA through hole, when the aspect ratio is ≥ 8:1, it is necessary to set the screen gear point, and when the aspect ratio is less than 8:1, it is not necessary;

(2) Set the width a and length b of the gear point according to the aperture D of the VIA through hole;

(3) According to the size of the stalls, select the screen with the corresponding mesh number as the base;

(4) Draw several dots on the screen respectively for production printing.

The utility model is simple in structure and compact in design. The size of the rice-shaped stalls used can be modified by adjusting the length and width of the rectangle. Variety of via vias.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Reference signs: stall opening 1, stall sheet 2.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, it is a screen stall for improving VIA through-hole ink residue. There are 8 stalls 1 evenly arranged on the edge of the stall, and the stalls 1 are all triangles, and there is a space between two adjacent stalls. It is set as a rectangular piece 2, the width of the piece 2 is a, the length of the two symmetrical pieces 2 is b, the size of the width a and the length b is related to the aperture D of the VIA through hole, and the value range of a is b +2;

When the hole diameter D of VIA is less than 9.8 mil, b is 4 mil and a is 6 mil; when 9.8<D≤14.8, b is 5 mil and a is 7 mil; when 14.8<D≤19.8, b is 6 mil and a is 8 mil ;19.8<D≤24.8, b is 7 mil, a is 9mil; 24.8<D≤29.8, b is 8mil, a is 10mil; 29.8<D≤34.8, b is 9mil, a is 11mil; 34.8<D When ≤39.8, b is 10mil, a is 12mil.

The design steps are as follows:

a. Confirm the minimum aperture of the VIA through hole on the base material, and calculate whether its aspect ratio is greater than or equal to 8:1; through the customer's Gerber data, find out that the minimum aperture of the VIA through hole is 9.8mil, and the thickness of the finished product is 78.4mil. The aspect ratio is calculated to be 8:1, and it is judged that this design needs to be enabled;

b. For the design of the rice-shaped stalls, the length and width of the rectangles that make up the rice-shaped stalls are calculated according to the diameter of the VIA through hole: 11.8milX4mil;

c. According to the minimum VIA aperture, the minimum requirement for the screen mesh number is calculated to be 110 mesh;

d. Draw the designed rice-shaped dots on the selected screen for production printing.

Claims (9)

1. A screen stall for improving VIA through-hole ink residue, characterized in that: the edge of the stall is evenly provided with 8 stalls (1), and the stalls (1) are all triangular, A rectangular block (2) is arranged between the two adjacent stalls (1), the width of the block (2) is a, the length of the two symmetrical blocks (2) is b, and the The size of a and b is related to the aperture D of the VIA through hole, and the value range of a is b +2. 2 . The screen dot for improving ink residue in VIA through holes according to claim 1 , wherein the dot is in the shape of rice. 3. The screen dot for improving ink residue in VIA through holes as claimed in claim 1, characterized in that: when the diameter D of the VIA through holes is less than 9.8 mil, b is 4 mil, and a is 6 mil. 4. The screen dot for improving ink residue in VIA through-holes according to claim 1, characterized in that: when the VIA through-hole diameter is 9.8<D≤14.8, b is 5 mil, and a is 7 mil. 5 . The screen dot for improving ink residue in VIA through holes according to claim 1 , wherein b is 6 mil and a is 8 mil when the via hole diameter of VIA is 14.8<D≤19.8. 6. The screen dot for improving ink residue in VIA through-holes according to claim 1, characterized in that: when the VIA through-hole diameter is 19.8<D≤24.8, b is 7 mil, and a is 9 mil. 7. The screen dot for improving VIA through hole ink residue as claimed in claim 1, characterized in that: when the via hole diameter of VIA is 24.8<D≤29.8, b is 8 mil, and a is 10 mil. 8. The screen dot for improving ink residue in VIA through-holes according to claim 1, characterized in that: when the VIA through-hole diameter is 29.8<D≤34.8, b is 9 mil, and a is 11 mil. 9 . The screen dot for improving ink residue in VIA through holes according to claim 1 , wherein when the VIA through hole diameter is 34.8<D≤39.8, b is 10 mil, and a is 12 mil.