Screen printing structure and circuit board

Abstract

A silk-screen structure and a circuit board, the silk-screen structure is configured on a circuit board body, the circuit board body is provided with a rectangular pin pad group, the silk-screen structure comprises an initial silk-screen marker, a first marker group and a second marker group, the initial silk-screen marker is used for being printed on the outer side of one vertex angle of the pin pad group; the first marker group comprises a plurality of first markers, the plurality of first markers are arranged at intervals in the first direction from the initial silk-screen marker, and a plurality of pin pads are arranged between the pin pad positions corresponding to every two adjacent first markers; the second marker group comprises a plurality of second markers, the second markers are arranged at intervals in the second direction from the starting silk-screen marker, and a plurality of pin bonding pads are arranged between the pin bonding pad positions corresponding to every two adjacent second markers. The silk-screen structure can clearly mark the arrangement sequence of the pin pads on the circuit board, and does not occupy too much space of the circuit board body.

Description

Technical Field

[0001] The present application relates to the field of semiconductor packaging technology, and in particular to a silk-screen structure and a circuit board. Background Art

[0002] As an indispensable and important electronic component in electronic and electrical products, circuit boards are the support of electronic components and the carrier of electrical connections. In order to facilitate the installation and maintenance of electronic components, the surface of the circuit board is usually printed with a silk screen layer. The silk screen layer is used to mark the component value, part number, polarity, version, manufacturer and other information on the circuit board, which can help users during assembly, welding and rework. A standardized silk screen layer can effectively improve the yield during assembly, welding and rework.

[0003] In the prior art, in order to allow users to clearly see the arrangement order of the pin pads on the circuit board, a large number of numbers are printed on the circuit board, which occupies a lot of effective space on the circuit board and leads to a waste of space on the circuit board. Utility Model Content

[0004] The purpose of the present application is to provide a silk screen structure and a circuit board to address the deficiencies in the above-mentioned prior art, which can clearly mark the arrangement order of the pin pads on the circuit board without taking up too much space on the circuit board body.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In one aspect of an embodiment of the present application, a silk screen structure is provided, which is configured on a circuit board body. A rectangular pin pad group is provided on the circuit board body. The silk screen structure includes: a starting silk screen marker, a first marker group, and a second marker group. The starting silk screen marker is used to be printed on the outside of a vertex corner of the pin pad group; the first marker group includes a plurality of first markers, and the plurality of first markers are arranged at intervals along a first direction starting from the starting silk screen marker, the first direction is parallel to a side edge of the pin pad group, and a plurality of pin pads are spaced between the pin pad positions corresponding to two adjacent first markers; the second marker group includes a plurality of second markers, and the plurality of second markers are arranged at intervals along a second direction starting from the starting silk screen marker, the second direction is parallel to the other side edge of the pin pad group, the second direction is perpendicular to the first direction, and a plurality of pin pads are spaced between the pin pad positions corresponding to two adjacent second markers.

[0007] Optionally, the initial silk-screen marker is an isosceles right triangle pattern, the right angle of the isosceles right triangle pattern is set toward the vertex of the pin pad group, and two right angles of the isosceles right triangle pattern are respectively parallel to the two side edges of the pin pad group.

[0008] Optionally, the starting silk-screen marker and the plurality of first markers are distributed at equal intervals, and the starting silk-screen marker and the plurality of second markers are distributed at equal intervals.

[0009] Optionally, one of the first marker and the second marker is a number and the other is a letter.

[0010] Optionally, the silk-screen structure further includes a forbidden area marker, and the forbidden area marker is used to be printed on the side of the pin pad group.

[0011] Optionally, the prohibited area marker is a rectangular wire frame.

[0012] Optionally, if the edge length of the pin pad group is 3mm<≤10mm, the width of the forbidden area marker is 0.4mm-0.6mm; if 10mm<any edge length of the pin pad group is<20mm, the width of the forbidden area marker is 0.9mm-1.1mm; if any edge length of the pin pad group is ≥20mm, the width of the forbidden area marker is 1.4mm-1.6mm.

[0013] Optionally, the silk-screen structure further includes a glue-dispensing area marker, and the glue-dispensing area marker is used to be printed on the outside of the top corner of the pin pad group.

[0014] Optionally, the glue dispensing area marker is L-shaped, and the glue dispensing area marker surrounds the outer side of the top corner of the pin pad group.

[0015] According to another aspect of an embodiment of the present application, a circuit board is provided, comprising a circuit board body and a silk-screen structure as described above and arranged on the circuit board body.

[0016] The beneficial effects of this application include:

[0017] The present application provides a silk screen structure, which is configured on a circuit board body, and a rectangular pin pad group is provided on the circuit board body. The silk screen structure includes: a starting silk screen marker, a first marker group, and a second marker group. The starting silk screen marker is used to print on the outside of a vertex of the pin pad group; the first marker group includes a plurality of first markers, and the plurality of first markers are arranged in a first direction from the starting silk screen marker, the first direction is parallel to a side edge of the pin pad group, and a plurality of pin pads are spaced between the pin pad positions corresponding to two adjacent first markers; the second marker group includes a plurality of second markers, and the plurality of second markers are arranged in a second direction from the starting silk screen marker, the second direction is parallel to the other side edge of the pin pad group, the second direction is perpendicular to the first direction, and a plurality of pin pads are spaced between the pin pad positions corresponding to two adjacent second markers. The silk screen structure prompts the user with a starting pin pad position by printing a starting silk screen marker on the circuit board body, and has a high degree of recognition. Starting from the initial silk-screen marker, the first marker group and the second marker group are printed in two directions perpendicular to each other along the circuit board body, respectively, to mark the pin pad positions in the first direction and the second direction, respectively, so as to clearly mark the arrangement order of the pin pads on the circuit board. The user can quickly find the corresponding pin pad according to the first marker and the second marker, and the interval marking will not take up too much space on the circuit board body. In addition, the silk-screen structure is attached to the surface of the circuit board body, which can also save space above the circuit board body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a circuit board provided in an embodiment of the present application;

[0020] Figure 2 One of the partial structural schematic diagrams of the circuit board provided in the embodiment of the present application;

[0021] Figure 3 This is a second schematic diagram of the partial structure of a circuit board provided in an embodiment of the present application.

[0022] Icons: 100-circuit board; 110-silk screen structure; 111-starting silk screen marker; 112-first marker group; 1121-first marker; 113-second marker group; 1131-second marker; 114-first starting marker; 115-first ending marker; 116-second starting marker; 117-second ending marker; 118-forbidden area marker; 119-glue dispensing area marker; 1191-first glue dispensing area marker; 1192-second glue dispensing area marker; 1193-sub-area marker; 120-circuit board body; 130-pin pad group; 131-pin pad; a-first direction; b-second direction. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] As an indispensable and important electronic component in electronic and electrical products, the circuit board is the support body of electronic components and the carrier of electrical connection. In order to facilitate the installation and maintenance of electronic components, the surface of the circuit board is usually printed with a silk screen layer, which is used to mark the component value, part number, polarity, version and manufacturer information on the circuit board, which can help users during assembly, welding and rework. The standardized silk screen layer can effectively improve the yield during assembly, welding and rework. In the prior art, in order to allow users to clearly see the arrangement order of the pin pads on the circuit board, a large number of numbers are printed on the circuit board. For example, for each pin pad, 1, 2, 3... are marked on the silk screen layer. In this way, a lot of effective space on the circuit board is occupied, resulting in a waste of space on the circuit board.

[0029] In order to solve the above technical problems, one aspect of the embodiments of the present application is as follows: Figure 1 and Figure 2 , a silk screen structure 110 is provided, which is configured on a circuit board body 120. The silk screen structure 110 is printed on the surface of the circuit board body 120 to mark part values, part numbers and other information on the circuit board body 120. The surface of the circuit board body 120 to which the silk screen structure 110 is applicable is divided into at least a part layout area and a prohibited layout area surrounding the part layout area. A pin pad group 130 is provided on the part layout area. The pin pad group 130 includes a plurality of pin pads 131. The plurality of pin pads 131 are distributed in a rectangular shape in the part layout area. It should be noted that the rectangular distribution of the plurality of pin pads 131 does not mean that the plurality of pin pads 131 must be strictly distributed in a standard rectangular shape, and can also be distributed approximately in a rectangular shape. For example, Figure 1 As shown, Figure 1 The plurality of pin pads 131 in the circuit board are approximately distributed in a rectangular shape, except that the pin pads 131 are not arranged at the corners. The silk-screen structure 110 is printed in the forbidden area of ​​the circuit board body 120 .

[0030] Specifically, the silk-screen structure 110 includes: a starting silk-screen marker 111, a first marker group 112, and a second marker group 113. The starting silk-screen marker 111 is used to print on the outside of a vertex of the pin pad group 130. The starting silk-screen marker 111 is used to mark the starting pin pad 131 position for the user. The starting pin pad 131 position refers to the pin pad 131 position located at a corner of the rectangular structure formed by the pin pad group 130. The starting pin pad 131 position may be arranged with a pin pad 131 or may not be arranged with a pin pad 131. Figure 1 In the illustrated embodiment, the pin pad 131 is not arranged at the starting pin pad 131. Starting from the starting pin pad 131, a first marker group 112 and a second marker group 113 may be arranged on the surface of the circuit board body 120 along a first direction a and a second direction b perpendicular to each other, respectively, to mark the subsequent pin pads 131.

[0031] The first marker group 112 includes multiple first markers 1121, and the multiple first markers 1121 are arranged at intervals along the first direction a starting from the starting silk-screen marker 111. The first direction a is parallel to a side edge of the pin pad group 130. Each first marker 1121 corresponds to a pin pad 131 position, and multiple pin pads 131 are spaced between the pin pad 131 positions corresponding to two adjacent first markers 1121.

[0032] The second marker group 113 includes multiple second markers 1131, and the multiple second markers 1131 are arranged at intervals along the second direction b starting from the starting silk-screen marker 111. The second direction b is parallel to the other side edge of the pin pad group 130, and the second direction b is perpendicular to the first direction a. Each second marker 1131 also corresponds to a pin pad 131 position, and the pin pad 131 positions corresponding to two adjacent second markers 1131 are spaced apart by multiple pin pads 131.

[0033] The above-mentioned silk-screen structure 110, by printing the starting silk-screen marker 111 on the circuit board body 120, prompts the user to the position of the starting pin pad 131, and has a high degree of recognition. Starting from the starting silk-screen marker 111, the first marker group 112 and the second marker group 113 are respectively printed in two directions perpendicular to each other along the circuit board body 120, so as to mark the position of the pin pad 131 in the first direction a and the second direction b at intervals, respectively, so as to clearly mark the arrangement order of the pin pads 131 on the circuit board 100. The user can quickly find the corresponding pin pad 131 according to the first marker 1121 and the second marker 1131, and the interval marking will not occupy too much space on the circuit board body 120. In addition, the above-mentioned silk-screen structure 110 is attached to the surface of the circuit board body 120, which can also save the space above the circuit board body 120.

[0034] Optionally, the starting silk-screen marker 111 and the plurality of first markers 1121 are equally spaced, and the starting silk-screen marker 111 and the plurality of second markers 1131 are equally spaced. This arrangement can facilitate users to find the marking pattern, thereby quickly finding the corresponding pin pad 131.

[0035] Furthermore, the interval between two adjacent first markers 1121 is equal to the interval between two adjacent second markers 1131 .

[0036] The positions of the pin pads 131 are marked with the same interval pattern in the first direction a and the second direction b, respectively, so that the user can find the corresponding pin pads 131 more conveniently.

[0037] Furthermore, the silk-screen structure 110 also includes a first starting marker 114, a first ending marker 115, a second starting marker 116 and a second ending marker 117, wherein the first starting marker 114 and the first ending marker 115 are respectively located on two opposite sides of the first marker group 112, and the second starting marker 116 and the second ending marker 117 are respectively located on two opposite sides of the second marker group 113, wherein the first starting marker 114 corresponds to the starting pin pad 131 position in the first direction a, the first ending marker 115 corresponds to the ending pin pad 131 position in the first direction a, the second starting marker 116 corresponds to the starting pin pad 131 position in the second direction b, and the second ending marker 117 corresponds to the ending pin pad 131 position in the second direction b.

[0038] The additional marking of the starting pin pad 131 position and the ending pin pad 131 position in the first direction a and the second direction b can make it easier for users to find the corresponding pin pad 131 .

[0039] In order to better distinguish the various markers, the marking forms of the start silk screen marker 111, the first marker 1121 and the second marker 1131 are optionally different. For example, they can be distinguished by graphics, numbers, letters, colors, etc. However, the marking forms of the first start marker 114 and the first end marker 115 can be the same as the marking form of the first marker 1121, and the marking forms of the second start marker 116 and the second end marker 117 can be the same as the marking form of the second marker 1131, so that the user can find the marking pattern and quickly locate the pin pad 131.

[0040] Optionally, the starting silk-screen marker 111 is an isosceles right triangle pattern, the right angle of the isosceles right triangle pattern is set toward the vertex of the pin pad group 130, and the two right angles of the isosceles right triangle pattern are respectively parallel to the two side edges of the pin pad group 130.

[0041] Since there is only one starting silk-screen marker 111, a graphic may be used for marking to improve recognition. The isosceles right triangle pattern structure occupies a small area and does not hinder the printing of the first starting marker 114 and the second starting marker 116. In other embodiments, the starting silk-screen marker 111 may also be a rectangular pattern, a circular pattern, or a five-pointed star pattern.

[0042] Optionally, one of the first marker 1121 and the second marker 1131 is a number and the other is a letter.

[0043] The multiple first markers 1121 may be the same number or letter, or different numbers or letters. The multiple second markers 1131 may be the same number or letter, or different numbers or letters. Preferably, the multiple first markers 1121 are numbers that increase in sequence according to the interval, and the multiple second markers 1131 are letters that increase in sequence according to the interval. When a single letter is not enough, a combination of two or more letters may be used, or the multiple first markers 1121 are letters that increase in sequence according to the interval. When a single letter is not enough, a combination of two or more letters may be used, and the multiple second markers 1131 are numbers that increase in sequence according to the interval. This allows the user to quickly determine the position of the pin pad 131 based on the first marker 1121, and can avoid incorrect welding direction.

[0044] For example, Figure 1As shown, the starting silk-screen marker 111 is an isosceles right triangle pattern, the first starting marker 114 is the number 1, the first ending marker 115 is the number 44, and the multiple first markers 1121 are 5, 10, 15, ..., 40 respectively; the second starting marker 116 is A, the second ending marker 117 is BD, and the multiple second markers 1131 are E, J, N, U, AA, AE, AJ, AN, AU, and BA respectively.

[0045] Optionally, the silk-screen structure 110 further includes a keep-out area marker 118 , and the keep-out area marker 118 is used to be printed on a side surface of the pin pad group 130 .

[0046] The forbidden area marker 118 is used to remind the user that parts cannot be placed within the designated range. In addition, it can also avoid collision with other parts when the circuit board 100 is repaired. Since the forbidden area is large, the forbidden area marker 118 is preferably a continuous line that can divide a certain area, or a continuous pattern that can cover a certain area.

[0047] Optionally, the prohibited area marker 118 is a rectangular wire frame.

[0048] The rectangular wireframe divides a certain area on the side of the pin pad group 130 to prompt the user that it is forbidden to arrange parts within the rectangular wireframe.

[0049] The inner area enclosed by the rectangular wire frame is a blank area. The first starting marker 114, the first marker group 112, the first end marker 115, the second starting marker 116, the second marker group 113, and the second end marker 117 can be printed inside the rectangular wire frame, thereby further saving the space of the circuit board body 120 occupied by the silk-screen structure 110.

[0050] By way of example, the number of the keep-out area markers 118 is four, and the four keep-out area markers 118 are respectively located on four sides of the pin pad group 130 .

[0051] The width of the rectangular wireframe needs to be adjusted according to the edge length of the corresponding pin pad group 130 . It should be noted that the width of the rectangular wireframe refers to the size of the rectangular wireframe in a direction perpendicular to the edge of the corresponding pin pad group 130 .

[0052] Optionally, if the edge length of the pin pad group 130 is 3mm<10mm, the width of the forbidden area marker 118 is 0.4mm-0.6mm; if 10mm<any edge length of the pin pad group 130 is<20mm, the width of the forbidden area marker 118 is 0.9mm-1.1mm; if any edge length of the pin pad group 130 is ≥20mm, the width of the forbidden area marker 118 is 1.4mm-1.6mm.

[0053] It should be noted that 3mm<edge length of pin pad group 130≤10mm means that all edge lengths of pin pad group 130 are within this range. The width of forbidden area marker 118 is 0.4mm-0.6mm, and its range includes the width of forbidden area marker 118 of 0.4mm and the width of forbidden area marker 118 of 0.6mm. Other range limitations on the width of forbidden area marker 118 also include the vertex value.

[0054] For example, when 3mm<the edge length of the pin pad group 130≤10mm, the width of the forbidden area marker 118 is 0.5mm; when 10mm<the length of any edge of the pin pad group 130<20mm, the width of the forbidden area marker 118 is 1mm; when the length of any edge of the pin pad group 130 is ≥20mm, the width of the forbidden area marker 118 is 1.5mm.

[0055] Please refer to Figure 3 When the pin pad group 130 is in a square shape, the forbidden area marker 118 may also be in a ring-shaped square shape, and the forbidden area marker 118 is arranged around the pin pad group 130 .

[0056] For some large parts, it is difficult to ensure their firmness only by welding with the pin pad 131, and the parts may become loose or fall off. Figure 2 and Figure 3 The screen printing structure 110 further includes a glue spot area marker 119, which is used to be printed on the outside of the top corner of the pin pad group 130. The glue spot area marker 119 is used to remind the user that the parts need to be glued at the glue spot area marker 119 after welding to enhance the firmness of the parts. The glue spot area marker 119 is preferably a continuous line that can divide a certain area, or a continuous pattern that can cover a certain area.

[0057] Alternatively, if Figure 2 As shown, the glue dispensing area marker 119 is L-shaped, and the glue dispensing area marker 119 surrounds the outer side of the top corner of the pin pad group 130.

[0058] The glue dot area marker 119 includes a first glue dot area marker 1191 and a second glue dot area marker 1192 vertically connected to the first glue dot area marker 1191. The connection between the first glue dot area marker 1191 and the second glue dot area marker 1192 corresponds to the top angle position of the pin pad group 130. One of the first glue dot area marker 1191 and the second glue dot area marker 1192 extends along the first direction a, and the other extends along the second direction b.

[0059] For example, the number of the glue dispensing area markers 119 is four, and the four glue dispensing area markers 119 correspond to the four vertices of the pin pad group 130 respectively.

[0060] For example, the width of the glue-dispensing area marker 119 is slightly greater than the width of the no-cloth area marker 118 , thereby being distinguished from the no-cloth area marker 118 .

[0061] For example, the size of the circuit board body 120 is 20 mm×20 mm, the width of the glue-dispensing area marker 119 is 2 mm, the length is 5.4 mm, and the width of the prohibited area marker 118 is 1.5 mm.

[0062] Alternatively, if Figure 3 As shown, the glue spot area marker 119 includes a plurality of sub-area markers 1193, and the plurality of sub-area markers 1193 are distributed at intervals in an L shape. In this way, the reinforcement of the parts can also be achieved.

[0063] This embodiment further provides a circuit board 100 , including a circuit board body 120 and a silk-screen structure 110 as described above and arranged on the circuit board body 120 .

[0064] The circuit board 100 includes the same structure and beneficial effects as the silk-screen structure 110 in the aforementioned embodiment. The structure and beneficial effects of the silk-screen structure 110 have been described in detail in the aforementioned embodiment, and will not be repeated here.

[0065] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A screen printing structure is configured on a circuit board body, and a rectangular pin pad group is provided on the circuit board body, characterized in that: The silk-screen structure comprises: a starting silk-screen marker, a first marker group and a second marker group, wherein the starting silk-screen marker is used to be printed on the outside of a vertex corner of the pin pad group; The first marker group includes a plurality of first markers, the plurality of first markers are arranged at intervals along a first direction starting from the starting silk-screen marker, the first direction is parallel to a side edge of the pin pad group, and a plurality of pin pads are spaced between pin pad positions corresponding to two adjacent first markers; The second marker group includes multiple second markers, and the multiple second markers are arranged at intervals along a second direction starting from the starting silk screen marker. The second direction is parallel to the other side edge of the pin pad group, and the second direction is perpendicular to the first direction. The pin pad positions corresponding to two adjacent second markers are spaced apart by multiple pin pads.

2. The screen printing structure according to claim 1, characterized in that: The starting silk-screen marker is an isosceles right triangle pattern, the right angle of the isosceles right triangle pattern is arranged toward the vertex of the pin pad group, and the two right angle sides of the isosceles right triangle pattern are respectively parallel to the two side edges of the pin pad group.

3. The screen printing structure according to claim 1, characterized in that: The starting silk-screen marker and the plurality of the first markers are distributed at equal intervals, and the starting silk-screen marker and the plurality of the second markers are distributed at equal intervals.

4. The screen printing structure according to claim 1, characterized in that: One of the first marker and the second marker is a number, and the other is a letter.

5. The screen printing structure according to claim 1, characterized in that: The silk-screen structure further includes a forbidden area marker, and the forbidden area marker is used for printing on the side of the pin pad group.

6. The screen printing structure according to claim 5, characterized in that: The prohibited area marker is a rectangular wireframe.

7. The screen printing structure according to claim 6, characterized in that: If 3mm<the edge length of the pin pad group≤10mm, the width of the forbidden area marker is 0.4mm-0.6mm; if 10mm<any edge length of the pin pad group<20mm, the width of the forbidden area marker is 0.9mm-1.1mm; if any edge length of the pin pad group is ≥20mm, the width of the forbidden area marker is 1.4mm-1.6mm.

8. The screen printing structure according to claim 1, characterized in that: The silk-screen structure further includes a glue-dispensing area marker, and the glue-dispensing area marker is used to be printed on the outside of the top corner of the pin pad group.

9. The screen printing structure according to claim 8, characterized in that: The glue dispensing area marker is L-shaped, and the glue dispensing area marker surrounds the outer side of the top corner of the pin pad group.

10. A circuit board, characterized in that: The invention comprises a circuit board body and a silk-screen structure as claimed in any one of claims 1 to 9 arranged on the circuit board body.

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