JPH1056246A - Structure of printed circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a structure of a printed circuit board that can improve workability and realize an economical and inexpensive printed circuit board and by which it can be judged whether electronic components are attached in advance or added after soldering by only checking the silk printing. SOLUTION: A printed circuit board 1 is provided with electronic components 2-1, 2-2, 2-3, and 2-4 which are connected with each other through patterns 3 and 3-1. Its indication parts 8 made by silk printing for added electronic components 2-1 and 2-4 which are attached after automatic soldering are formed by marking the inside of projection frame of outer appearance of the parts 2-1 and 2-4 through silk printing, and a normal attached component indication part 4 is outlined larger than the projection frame of outer appearance of the parts 2-2 and 2-3 by one line, thereby discriminating the indication parts 4 and 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board structure on which electronic components are mounted, and more particularly, to a printed wiring board structure which displays silk printed images for distinguishing whether the electronic components are to be attached before or after. It is.

[0002]

2. Description of the Related Art Various electronic components are arranged on a printed wiring board in order to form an electronic circuit, and the electronic components are connected to each other by a pattern in order to secure the function.
Many of these electronic components are inserted into a printed wiring board in advance by automatic insertion, and then are automatically soldered through a solder bath.

[0003] However, some electronic components are soldered by hand after the work, and the work process includes these pre-work and post-work. The retrofit electronic component is, as shown in FIG. 4, an electronic component 2-1 whose component case is made of a material that is easy to melt.
The solder melts due to the heat of the solder and becomes unusable. (When the solder passes through the solder bath, the solder rises from the insertion hole to the front side of the printed wiring board 1, that is, directly below the electronic component 2-1. When the solder passes through a solder tank to be mounted on the end of the printed wiring board 1 or to be mounted on the end of the printed wiring board 1, the solder rises from the end of the printed wiring board 1 and the body melts, or the rail of the solder tank 1 The electronic component 2-2 cannot be automatically soldered.

[0004] For this reason, in the case of such retrofit electronic components (2-1, 2-2), the workers are formed by silk printing on the printed wiring board 1 while looking at assembly drawings and assembly lists. The position of the display unit 4 is illuminated and confirmed, and a retrofitting operation for mounting the electronic components (2-1, 2-2) is performed.

[0005] The size of the printed wiring board 1 is getting smaller and smaller year by year. For this reason, many components are mounted and the number of patterns 3 connecting them is increased.
Also, as shown in FIG. 7, the pattern 3-1 must be provided below the electronic component 2-4, and when the electronic component 2-4 is made of metal, the pattern 3-1 is provided thereunder. If so, the electronic component 2-4 comes into contact with the pattern 3-1 to impair the function of the electronic component 2-4. For this purpose, the insulating paper 5 is placed under the electronic component 2-4 to prevent the contact, or the electronic component 2-4 is floated and attached to prevent the contact.

[0006]

As described above, when performing silk printing on the printed wiring board 1, the electronic components 2-1 mounted on the printed wiring board 1 are displayed as a display method.
2-2, 2-3, the mounted electronic components 2-
The display part 4 by silk printing showing the shape of 1, 2, 2-2, and 2-3 is displayed by an outline, and the electronic component 2 is displayed.
When inserting -1, 2-2, and 2-3, the display on the display unit 4 is checked to confirm the mounting position and shape.

However, the mounted electronic components 2-
Since the display units 1, 2-2, and 2-3 have the same expression method, it is not possible to distinguish between the front electronic component and the rear electronic component. For this reason, it is very troublesome for the operator to check the assembly drawing and the notation of the attached electronic parts after the assembly list, and to perform the retrofitting work. Further, there is a problem in that it is not possible to confirm the front and rear electronic components simply by looking at the display unit 4 of the printed wiring board 1 by silk printing.

When mounting the electronic component 2-4 covered with metal, the electronic component 2-4 is insulated from the pattern 3-1.
The insulating paper 5 is inserted between the substrate 4 and the pattern 3-1 on the printed wiring board 1. In this insulating method, the outer shape is formed and fixed in order to fit the insulating paper 5 to the insulating portion. Adhesive and adhesive tape must be provided for
There was a problem that the cost was high economically.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of looking at a display portion by silk printing, whether it is a pre-installed electronic component or a post-installed electronic component. It is an object of the present invention to provide an economical and inexpensive printed wiring board structure which can determine the nature of the printed wiring board and has good workability.

[0010]

To achieve the above object, a printed wiring board structure according to the first aspect of the present invention comprises:
A printed wiring board in which each of the electronic components is connected in a pattern, a retrofit display portion by silk printing of a retrofit electronic component to be retrofitted after automatic soldering, and a retrofit display portion by silk printing of a retrofitted electronic component. It is characterized by being distinguished.

[0011] With this configuration, it is possible to visually distinguish the retrofitted display portion of the retrofitted electronic component to be retrofitted after the automatic soldering by silk printing from the retrofitted display portion of the retrofitted electronic component to be retrofitted by silk printing. Will be possible.
This eliminates the need for the operator to check the assembly drawing and the attached parts list for the attached parts and perform the attached work.
This saves labor and allows the user to confirm the front and rear electronic components only by looking at the display unit (front display unit and rear display unit) of the printed wiring board.

As described above, it is possible to judge whether the electronic component is a pre-installed electronic component or a post-installed electronic component just by looking at the display portion of the printed wiring board by silk printing, and the printed wiring board structure with good workability. Thus, an economical and inexpensive printed wiring board structure can be effectively supplied.

According to a second aspect of the present invention, there is provided a printed wiring board structure according to the first aspect of the present invention, wherein the retrofit display section includes an outer shape of the retrofit electronic component. And the inside of the front display part is larger than the projection frame of the outer shape of the pre-installed electronic component, and one line is formed. It consisted of.

With this configuration, the inside of the projection frame of the outer shape of the retrofitted electronic component is filled with silk printing, and the planar retrofit display portion is formed into a single line that is larger than the projection frame of the outer shape of the retrofitting electronic component. It is possible to reliably and visually distinguish the front display unit configured as described above. For this purpose, the worker checks the assembly drawing and the list of attached parts on the assembly list,
It is not necessary to perform a retrofitting operation, and labor can be saved. In addition, it is possible to confirm the retrofitting and retrofitting electronic components only by looking at the display section (the retrofitting display section and the retrofitting display section) of the printed wiring board.

As described above, it is possible to judge whether the electronic component is a pre-installed electronic component or a post-installed electronic component just by looking at the display portion of the printed wiring board by silk printing, and the printed wiring board structure with good workability. Thus, an economical and inexpensive printed wiring board structure can be effectively supplied.

According to a third aspect of the present invention, there is provided a printed wiring board structure according to the second aspect, wherein the retrofit electronic component is made of a conductive material. An electronic component having a jacket;
The retrofit display unit has a double structure with a resist, is provided on a pattern on the printed wiring board, and the retrofit electronic component is mounted on the retrofit display unit.

With this configuration, not only can the same effect as the above-described second aspect (claim 1) can be obtained, but also a retrofit electronic component, in particular, an electronic component covered with a conductive material (metal case). When mounting, by mounting on the retrofit display portion provided in a pattern on the printed wiring board in a double structure with a resist, the insulation effect is increased,
Electronic components can be mounted as they are by solid attachment.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a printed wiring board structure according to the present invention, FIG. 2 is a side view of the printed wiring board structure, and FIG. 3 is a flowchart of a manufacturing process of the printed wiring board structure. The same components as those in the above-described conventional printed wiring board structure are denoted by the same reference numerals.

As shown in FIG. 1, a connector 2-1, a light emitting diode 2-2, an IC 2
3 and an electronic component 2-4 covered with a metal case are mounted, and each of the electronic components 2-1 and 2-
2, 2-3 and 2-4 are connected by patterns 3 and 3-1 to form a circuit function.

On the printed wiring board 1, the display portions 4, 8 of the electronic components 2-1, 2-2, 2-3, 2-4 are provided.
Are displayed by silk printing at positions where these electronic components 2-1, 2-2, 2-3, and 2-4 are arranged.

In this case, the IC2-
3 is slightly larger than the projected frame of the outer shape of the IC 2-3, and one pre-display unit 4 is provided so that the pre-display unit 4 can be visually confirmed even when the IC 2-3 is mounted. Printed with lines.

Further, the connector 2-1 and the light emitting diode 2 which are retrofit electronic components to be retrofitted after automatic soldering are provided.
-2 and the retrofit display section 8 of the electronic component 2-4 by silk printing are slightly larger than the projection frame of the outer shape of the connector 2-1 or the light emitting diode 2-2 or the electronic component 2-4. The inside is painted in a flat pattern by silk printing.

FIG. 3 shows a manufacturing process of the printed wiring board 1. The manufacturing process of the printed wiring board 1 is divided into a printed wiring board manufacturing process and an assembly process.

In the manufacturing process of the printed wiring board 1, a hole for mounting an electronic component on the copper-clad laminate is made (Step S).
1. Step S2) Next, a pattern is formed by pattern printing or photolithography in order to form a pattern (Step S3), and an etching process is performed to remove excess copper other than the pattern (Step S4). After that, through a plating step (Step S5) of plating a perforated portion to form a through hole, a resist is applied to prevent solder from being unnecessarily attached in a soldering step (Step S6), and a component mounting position and Silk printing for displaying a necessary product name is performed (step S7), an outer shape is formed (step S8), and after confirming the appearance and the connection state of the pattern (step S9), the surface is subjected to a rustproofing process (step S1).
0), the printed wiring board 1 is configured.

In the assembling process, the printed wiring board 1
The electronic components are mounted on the device (Step S11), automatic soldering is performed (Step 12), the retrofitted components are attached (Step 13), and the printed circuit board structure for the electronic device is manufactured through inspection (Step 14) (Step S14). Step 15).

The pre-attachment and post-attachment display sections 4 and 8 are used in a silk printing process for displaying a component mounting position and a necessary product name in step S7.

Then, IC2-3, which is a front electronic component,
Is mounted on the front display unit 4. In this case, the front display unit 4 is slightly larger than the outer shape of the IC 2-3 and is printed with one line.
Even after the IC 2-3 is mounted, the front display unit 4 can be visually confirmed.

Also, the connector 2-1 and the light emitting diode 2 which are retrofit electronic components to be retrofitted after automatic soldering are provided.
-2 and the electronic component 2-4 are mounted on the retrofit display unit 8 in which the inside is filled in a planar shape. In this case, the retrofit display unit 8 is slightly larger than the external shape of the connector 2-1, the light emitting diode 2-2, and the electronic component 2-4.
Connector 2-1, light emitting diode 2-2, electronic component 2-
4 can be visually confirmed even after the 4 is mounted.

As described above, the retrofit display section 8 of silk-printing of retrofit electronic components (connector 2-1, light emitting diode 2-2, and electronic component 2-4) to be retrofitted after automatic soldering is provided with a projection frame of the outer shape. It is larger and the inside thereof is filled with silk printing to form a plane, and is distinguished from the front display unit 4 by silk printing of the electronic component (IC2-3) to be attached, so that the front electronic component and the rear Electronic components can be distinguished.

This eliminates the need for the operator to check the assembly drawing and the attached parts list for the attached parts and perform the attached work, thereby saving labor. In addition, it is possible to confirm the pre-installed and post-installed electronic components only by looking at the pre-installed and post-installed display sections 4 and 8 of the printed wiring board 1.

Further, when mounting an electronic component 2-4, which is covered with a metal case (conductive material) after mounting,
By mounting the electronic component 2-4 on the double structure of the resist 9 applied in step S6 and the retrofitted display unit 8 by silk printing on the pattern 3-1 on the printed wiring board 1, the insulation effect is obtained. And the electronic component 2-4 can be mounted as it is by solid attachment.

[0032]

As described above, according to the printed wiring board structure according to the first aspect of the present invention, a retrofitted electronic component that is retrofitted after automatic soldering of a printed wiring board in which each of the electronic components is connected in a pattern. Of the retrofitted display part by silk-printing is distinguished from the retrofitted display part by silk-printing of the retrofitted electronic component, so that the retrofitted display by silk-printing of the retrofitted electronic component to be retrofitted after automatic soldering The part can be visually distinguished from the front display part by silk printing of the front electronic component to be front mounted. This eliminates the need for the operator to check the assembly drawings and the attached parts list for the attached parts, and to perform the attached work. This saves time and effort, and also eliminates the need for a printed wiring board display unit (front display unit). And retrofit display)
You can check front and back electronic components just by looking at them.

As described above, it is possible to determine whether the electronic component is a pre-installed electronic component or a post-installed electronic component just by looking at the display portion of the printed wiring board by silk printing, and the printed wiring board structure with good workability. Thus, an economical and inexpensive printed wiring board structure can be effectively supplied.

According to the printed wiring board structure of the second aspect of the present invention, in the printed wiring board structure of the first aspect, the retrofit display portion is larger than a projection frame of the outer shape of the retrofit electronic component. Therefore, the inside of the front display unit is filled with a silk screen to form a plane, and the front display unit is configured by a single line that is larger than the projection frame of the outer shape of the front electronic component. The inside of the projection frame of the outer shape of the retrofitted electronic component is filled with silk-screen printing, and the retrofit display portion having a planar shape is larger than the projection frame of the outer shape of the retrofitting electronic component, and is formed by a single line. Can be reliably distinguished visually. For this,
The operator does not need to perform the retrofitting work by looking at the assembly drawing and the attached parts notation in the assembly list, which saves time and effort, and also saves the printed wiring board display section (front display section and retrofit display section). ), You can check the pre-installed and post-installed electronic components.

As described above, it is possible to judge whether the electronic component is a pre-installed electronic component or a post-installed electronic component just by looking at the display portion of the printed wiring board by silk printing, and the printed wiring board structure with good workability. Thus, an economical and inexpensive printed wiring board structure can be effectively supplied.

According to the printed wiring board structure of the third aspect of the present invention, in the printed wiring board structure of the second aspect, the post-installed electronic component is an electronic component having a jacket made of a conductive material. The above-mentioned claim, wherein the retrofit display section has a double structure with a resist, is provided on a pattern on the printed wiring board, and is mounted with the retrofit electronic component on the retrofit display section. 2
In addition to providing the same effect as the effect of the invention of (Claim 1), when mounting a retrofitted electronic component, particularly an electronic component covered with a conductive material (metal case), a double structure with a resist is used. By mounting on the retrofit display portion provided on the pattern on the printed wiring board, the insulating effect is increased, and the electronic component can be directly mounted by solid-attachment.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a printed wiring board structure according to the present invention.

FIG. 2 is a side view of the printed wiring board structure.

FIG. 3 is a flowchart of a manufacturing process of the printed wiring board structure.

FIG. 4 is an exploded perspective view for explaining mounting of electronic components in a conventional printed wiring board structure.

FIG. 5 is a side view of the printed wiring board structure.

FIG. 6 is an exploded perspective view for explaining mounting of an electronic component covered with a conductive material (metal case) in the printed wiring board structure.

FIG. 7 is a side view of the printed wiring board structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed wiring board 2-1 Connector (electronic component) 2-2 Light emitting diode (electronic component) 2-3 IC (electronic component) 2-4 Electronic component 3 Conductor pattern 3-1 Conductor pattern 4 Front display section 8 Retrofit display Department

Claims (3)

[Claims] A printed wiring board in which each of the electronic components is connected in a pattern is provided with a retrofit display portion by silk printing of a retrofit electronic component to be retrofitted after automatic soldering. A printed wiring board structure characterized by being distinguished from a front display unit. 2. The retrofit display unit is configured to be larger than a projection frame of an outer shape of the retrofit electronic component, and to have an inner surface thereof filled with silk printing to have a planar shape. 2. The printed wiring board structure according to claim 1, wherein the printed wiring board structure is larger than the projection frame of the external shape of the attached electronic component and is constituted by one line. 3. The post-installed electronic component is an electronic component having a jacket made of a conductive material, wherein the post-installed display unit is provided in a pattern on the printed wiring board in a double structure with a resist, 3. The printed wiring board structure according to claim 2, wherein said retrofit electronic component is mounted on said retrofit display portion.