JPH0525769U - Mounting structure for discreet parts - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the occurrence of solder crack failures when mounting discrete components to a printed wiring board. [Configuration] 2 is a printed wiring board, a cylindrical metal tube 6 with a collar is previously inserted into a predetermined mounting hole of the printed wiring board 2, and the leads 4 of the discrete component 1 are inside the cylindrical metal tube 6 with a collar. Insert into. After that, the conductor land portion 3 and the component lead 4 are soldered by soldering to form a solder portion 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printed wiring board and a mounting structure for discrete components.

[0002]

[Prior Art]

 As shown in Fig. 2, the conventional mounting structure for discrete parts is such that the discrete part 1 is inserted into the required mounting hole of the printed wiring board 2 on one side, and then soldering is performed to make the conductor land 3 and the part Lead 4 is soldered to form a solder portion 15. However, it is very difficult to control the amount of solder in the soldering process, and the amount of solder adhered to large parts tends to be less than the required value compared to small parts, especially when the lead shape is square and there is insufficient solder. Therefore, defective soldering easily occurs. Also, the diameter of the lead varies depending on the part, and there are many variations in the size between the leads attached to one part.To absorb these errors, the diameter of the mounting hole should be smaller than the diameter of the lead. The size is quite large, and the movement of the leads causes the relevant parts to rise and tilt, causing failures such as solder cracks.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of such a point, and in the case of a large-sized component, the relative amount of attached solder tends to be insufficient, and in particular, when the lead shape is square, insufficient soldering tends to cause defective soldering. Also, the present invention provides a mounting structure for discrete components in which solder cracks or other troubles do not occur due to the mounting components rising or tilting.

[0004]

[Means for solving the problem]

 In order to solve the above-mentioned problems, the present invention inserts a collared metal tube into a required mounting hole of the printed wiring board in advance when mounting the discrete component on the printed wiring board, and attaches the lead of the component to the metal portion with the collared part. The purpose of the present invention is to provide a mounting structure for discrete parts that is inserted into a pipe and then soldered.

[0005]

[Action]

 With the above-mentioned structure, in the discrete component mounting structure according to the present invention, the lead of the discrete component is inserted into the mounting hole of the printed wiring board in advance, and the lead of the discrete component is cylindrical with the collar. By inserting it inside the metal tube, the difference between the diameter of the mounting hole and the outer diameter of the cylindrical metal tube with a collar and the difference between the inner diameter of the metal tube with a collar and the diameter of the lead are both reduced, The outer side of the metal tube with the cover and the conductor land part of the printed wiring board are soldered, and at the same time the inner side of the metal tube with the collar and the leads are also soldered by the capillary phenomenon, so that a uniform amount of solder adhesion can be obtained. Since the strength is greatly increased, it is possible to prevent the occurrence of failures such as rice cracks.

[0006]

【Example】

 An embodiment of a discrete component mounting structure according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of an essential part of an embodiment of a mounting structure for discrete components according to the present invention. In the figure, reference numeral 2 denotes a printed wiring board in which a flanged cylindrical metal tube 6 is previously inserted into a required mounting hole of the printed wiring board 2 and leads 4 of the discrete component 1 are inserted into the flanged metal tube 6. Then, the conductor land portion 3 and the lead 4 of the component are soldered by soldering to form a solder portion 5. In the above description, the flanged metal tube is cylindrical, but the same effect can be expected with a flanged metal tube.

[0007]

[Effect of the device]

 As described above, in the mounting structure of the discrete component according to the present invention, the cylindrical metal tube with the collar is previously inserted into the mounting hole of the printed wiring board, and the lead of the discrete component is connected to the cylindrical metal tube with the collar. By inserting it inside the pipe, the difference between the diameter of the mounting hole and the outer diameter of the cylindrical metal pipe with a collar and the difference between the inner diameter of the cylindrical metal pipe with a collar and the diameter of the lead are both small. Since the outside of the cylindrical metal tube with a collar and the conductor land of the printed wiring board are soldered, the inside of the cylindrical metal tube with a collar and the leads are also soldered by the capillary phenomenon, so uniform soldering is achieved. Since the adhesion amount is obtained and the strength of the solder portion is significantly increased, it is possible to prevent the occurrence of failures such as solder cracks.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of a discrete component mounting structure according to the present invention.

FIG. 2 is a sectional view of an essential part of an example of a conventional discrete component mounting structure.

[Explanation of symbols]

 1 Discrete parts 2 Printed wiring board 3 Conductor land part 4 Lead 5 Solder part 6 Cylindrical metal tube with a collar 15 Solder part

Claims (1)

[Scope of utility model registration request] 1. When mounting a discrete component on a printed wiring board, a collared metal tube is previously inserted into a required mounting hole of the printed wiring board, the lead of the component is fitted into the collared metal tube, and then, Mounting structure for discrete parts characterized by soldering.