JPS6320140Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printed circuit board characterized by the shape of a solder resist.

When attaching electrical components to a printed wiring board by soldering, the lead terminals of each electrical component are inserted into the component mounting holes of the printed wiring board, and these are soldered all at once using a flow soldering method or the like. A single printed wiring board has a large number of resistors, capacitors,
Lead terminals for coils, transistors, and terminals are inserted, and connected to the wiring conductor at exposed portions of the resist coated on the conductor land. The shape of the exposed portion of the solder resist for soldering is almost concentric with the mounting hole due to improved soldering efficiency and the drawing method.

In Fig. 1, A indicates the relationship between the insertion hole diameter and the copper foil, and B indicates that an R is provided between the conductor land 2 and the conductor pattern 3 to prevent the foil from breaking. It shows that
Furthermore, C is a large diameter terminal, and the square pin has 1 mounting hole.
This indicates that the diameter of the conductive land 2 is increased relative to the diameter of the conductive land 2.

However, when a finished printed wiring board is viewed from the wiring conductor surface, it is difficult to confirm and distinguish the position of the electrical components inserted due to the complex pattern shape and extremely large number of lands, making it difficult to identify the position of the electrical components inserted during the production process. Services such as inspections and repairs in the market required a great deal of effort. In many cases, an additional process of printing a service map on the printed circuit board itself has been carried out to solve the above problem.

An object of the present invention is to provide an excellent printed wiring board that eliminates the above-mentioned drawbacks.

A printed wiring board on which a discrimination mark is displayed in the resist printing process according to an embodiment of the present invention will be described below with reference to FIG. 2. Conventionally, exposed resist portions were formed in concentric circles for each mounting hole 41 of an electrical component, but here they are formed as a set for each type of electrical component, and each soldering portion 44a, 44 of a pair of conductor lands 42 is formed as a set for each type of electrical component.
b, 44c, 44d, 44e, 44f and the consecutive arrangement direction display parts 45a, 45b, 45c therebetween.
It is formed by applying a solder resist so that it becomes a discrimination mark.

In FIG. 2, A shows a specific example for inserting a resistor, B for inserting a capacitor, C for inserting a coil, D for inserting a transistor, and E for inserting a plated wire. These discrimination marks have irregularities formed on the outer periphery of a substantially circular shape (soldering part) to the extent that they can be distinguished with the naked eye for each type of inserted electrical component. The arrangement direction display parts 45a, 45b, and 45c are also set to the minimum width that can be discerned with the naked eye. Note that 42 is a conductor land, and 43 is a conductor pattern for wiring.

3 and 4 are cross-sectional views of the above-mentioned embodiment, and FIG. 3 is taken along the - line in FIG.
The figure is taken along the line '--' of FIG. Here, 40 is an insulating substrate.

According to the printed wiring board of this example configured as described above, the shape of the resist exposed portion is formed on the outer periphery of a concentric circle having a smaller diameter than the shape of the conductor, so that a continuous uneven shape that varies depending on the inserted parts is formed. , it is possible to solder with less solder without reducing solderability, the weight of the wiring board is reduced as a result, and the continuous arrangement direction display makes it easy to identify the inserted parts and the wiring direction is clear. This will improve inspection in the production process and serviceability in the market. Furthermore, when the finished printed wiring board is connected to other circuits, it has the effect of reducing foil lifting even when external pressure is applied.

As described above, according to the present invention, soldering can be performed with a small amount of solder without reducing solderability, and the weight of the printed wiring board can also be reduced, and
The continuous array direction display section allows you to clearly identify the array direction even in complex, fine, and small wiring conditions, and of course, insert parts can also be identified at a glance by the uneven shape of the outer periphery of the resist exposed area. It is easier to identify the inserted electrical components when viewing the finished wiring board from the wiring conductor side.
Inspection during the production process and serviceability in the market will be improved. Furthermore, in conventional products, the arrangement of inserted parts is printed as a service map on the wiring conductor surface in one step during the manufacturing process of the printed wiring board, but this can be omitted with the present invention, which has the effect of reducing costs. .

[Brief explanation of the drawing]

Figures 1A, B, and C are diagrams showing design standards for general printed wiring boards, and Figure 2 is a printed wiring board in which identification marks for inserted parts according to an embodiment of the present invention are formed on the printed surface of solder resist. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a sectional view taken along the - line in Fig. 2.
FIG. 1, 41... Mounting hole, 2, 32, 42... Conductor land, 3, 43... Conductor pattern for wiring,
44a, 44b, 44c, 44d, 44e, 44
f...Solder resist exposed portion, 40...Insulating substrate, S...Solder resist.

Claims (1)

[Scope of utility model registration request] An insulating substrate, a wiring conductor printed on the insulating substrate to form an electric circuit network, and a lead terminal for an electrical component inserted into a predetermined position of the conductor so as to penetrate through the insulating substrate. a plurality of attachment holes, and a solder resist is applied on the conductor surrounding each of the plurality of attachment holes to form a concentric resist exposed portion having a diameter smaller than the shape of the conductor; Further, on the outer periphery of the exposed resist portion, a continuous uneven pattern that differs depending on the inserted component is formed to form a discrimination mark for the electrical component, and a set of electrical components to be inserted is formed between the conductors. A printed wiring board in which an arrangement direction display section indicating an arrangement direction of the printed wiring board is continuously formed.