JPH04133410U - Small wire-wound parts with surface soldering type - Google Patents

Abstract

(57) [Summary] [Purpose] Development of small wire-wound parts of the surface soldering type that can reduce the height from the mounting board surface as much as possible without reducing efficiency. With the goal. [Structure] This small wire winding component has a terminal pin that protrudes laterally from the lower outer surface of the bobbin collar, is bent upward diagonally or at right angles from near the outer surface of the collar, and is further bent laterally at the tip end. It becomes.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to surface soldering type small wire-wound parts, especially printed wiring. Insert the lower part of the winding component into the mounting hole formed on the board, and attach the terminal pin halfway to the board surface. The present invention relates to a small wire-wound component of a surface soldering type that is configured to be soldered.

0002

[Conventional technology]

There are various types of small wire-wound parts that can be soldered on the surface. Indicates a shape transformer. FIG. 5 is a partial perspective view showing a printed wiring board and a small transformer. FIG. 6 is a longitudinal sectional view of a small transformer attached to a printed wiring board. In these drawings, 1 is a bobbin made of synthetic resin, and the corners forming the winding part are End flanges 1a and 1b are formed at both ends of the cylindrical portion, and a middle flange 1 is formed between these end flanges 1a and 1b. c is formed.

0003 The winding part is divided into a first winding section and a second winding section by the middle tsuba 1c. A primary coil 2 is wound in the winding section, a secondary coil 3 is wound in the second winding section, and The ends of these coils are fixed to the terminal pins described below. Also, on the coil surface is wrapped with insulating tape 4. Thick trapezoidal portions 1d and 1e are formed below the end flanges 1a and 1b, and these trapezoidal portions 1d , 1e, a straight terminal pin 5 is planted so as to protrude laterally. . In addition, a terminal pin 6 similar to the above is implanted in the middle flange 1c so as to protrude sideways. ing. The above-mentioned bobbin 1 has E-shaped cores 7 and 8 of the same shape made of ferrite material in the rectangular tube part. It is assembled by inserting the central leg from both sides.

0004 The small transformer configured in this way is attached to the printed wiring board 9 as follows. wear. The printed wiring board 9 has a mounting hole slightly larger than the circumference of the small transformer. 10 is provided, the lower part of the transformer is inserted into this mounting hole 10, and each terminal pin 5 is inserted into the mounting hole 10. , 6 are brought into contact with the surface of the printed wiring board 9. In this state, around the mounting hole 10 Each terminal pin 5, 6 contacts the provided printed circuit, so solder it to the printed circuit. It is fixed to the wiring board 9.

[0005]

[Problem that the idea aims to solve]

As shown in FIG. 6, the small transformer described above is fitted into the mounting hole 10 of the printed wiring board 9 by a height _H1 , so the height from the board surface to the top surface of the transformer is _H2 , and the height of the transformer is The mounting height of the small transformer 1 is lower than that in the case Ho. However, it is desired that the height of small wire-wound parts used in thin telecommunication equipment such as flash discharge light emitters, desk calculators, and displays be lowered. The object of the present invention is to develop a small wire-wound component whose height from the printed wiring board surface can be made as low as possible without reducing efficiency.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, the present invention uses a flanged bobbin and a flanged bobbin. It has a wound coil and a terminal pin that protrudes sideways from the lower outer surface of the bobbin collar. , insert the lower part into the mounting hole formed on the mounting board and insert the terminal pin on the mounting board surface. For small wire-wound parts configured to be soldered, the above terminal pin is near the outer surface of the bobbin collar. A shape that is bent upward from the top and then bent sideways at the tip. We propose a small wire-wound component characterized by the following.

[0007]

[Effect]

This small wire winding component has a terminal pin that protrudes sideways from the lower outer surface of the bobbin collar. We are prepared. Bend this terminal pin upwards from near the outer surface of the flange, and then turn the tip sideways. It is bent and formed. In addition, the mounting board has a mounting hole that is slightly larger than the circumference of the small wire-wound component. When a small wire-wound component is inserted into this mounting hole, the tip of the terminal pin will be It comes into contact with the mounting board surface around the mounting hole. If you install small wire-wound parts in this state, the terminal pins will be installed upwards. The height from the board surface to the top surface of the transformer is reduced.

[0008]

【Example】

Next, an example in which the present invention is implemented as a small transformer will be explained along with the drawings. do. Figure 1 is a perspective view showing the printed wiring board and small transformer, and Figure 2 is the printed wiring board. FIG. 3 is a vertical cross-sectional view of a small transformer attached to a plate.

[0009] In these drawings, 50 is a bobbin similar to the conventional example, with end flanges 5 on both sides of the rectangular tube part. 0a, 50b, and a middle flange 50c is provided between these end flange 50a, 50b. There is. The primary coil 51 is in the first winding section divided by the middle tsuba 50c, and the second A secondary coil 52 is wound in each winding section, and the ends of these coils are the ends described below. It is fixed to child pins 54 and 55. Additionally, an insulating tape 53 is wrapped around the surface of the coil. It is attached.

0010 In addition, the trapezoidal parts 50d and 50e formed thickly on the lower surfaces of the end flanges 50a and 50b have , terminal pins 54 projecting laterally from the outer surfaces of these trapezoidal parts 50d and 50e, Further, terminal pins 55 projecting laterally are implanted on the lower outer surface of the middle collar 50c. It is. These terminal pins 54 and 55 have similar shapes, and as an example, the terminal pins 54 and 55 are shown in FIG. The shape of the pin 54 is shown enlarged.

[0011] After the terminal pin 54 is planted parallel to the bottom surface 50f of the trapezoidal portion 50d, Bend diagonally upward at an appropriate angle from near the outer surface of d, and then place the tip side on a stand. It is bent and formed so as to be parallel to the bottom surface 50f of the shaped part. The first horizontal portion 54a of the terminal pin 54 described above is a fastening portion that fastens the end of the coil. becomes. Note that the terminal pins 55 have the same shape.

0012 In addition, the bobbin 50 described above has an E-shaped core made of ferrite material, as in the conventional example. 56 and 57 are assembled to form a small transformer.

[0013] On the other hand, as shown in FIG. 1, the printed wiring board 58 as a mounting board has the above A mounting hole 59 is provided for mounting a small transformer. This mounting hole 59 has a hole shape slightly larger than the circumferential diameter of the small transformer.

[0014] When the lower part of the small transformer described above is inserted into this mounting hole 59, an example is shown in FIG. As shown, the second horizontal portion 54b of the terminal pin 54 is on the surface of the printed wiring board 58. contact the top. Terminal pins 55 similarly abut on the surface of printed wiring board 58. In the above state, the second horizontal portions 54b and 55b of these terminal pins 54 and 55 are The small transformer is fixed to the printed wiring board 58 by top soldering.

The small transformer installed as described above enters the mounting hole 59 by a height H ₃ as shown in FIG. 2, so the height from the printed wiring board 58 surface to the top surface of the transformer is H ₄ . The installation height of small transformers is lower.

[0016] FIG. 4 shows another embodiment in which the shapes of the terminal pins 54 and 55 are changed. The terminal pin 60 of this embodiment is implanted parallel to the bottom surface 50f of the trapezoidal portion 50d. Then, bend upward at a right angle from near the outer surface of the trapezoidal part 50d, and then It has the shape of being bent sideways again. Similarly to the embodiment described above, this terminal pin 60 also has a first horizontal portion 60a that fastens the end of the coil. The second horizontal part 60b is the part that comes into contact with the surface of the printed wiring board 58. becomes. Note that other terminal pins are formed in the same manner.

[0017] Further, the above-mentioned terminal pin 60 is configured such that the vertical portion 60c is in contact with the hole edge of the mounting hole 59. By doing so, the movement of the small transformer within the mounting hole 59 can be suppressed, so for example, This prevents the small transformer from shifting its position even while being moved to an automatic soldering machine. Wear.

[0018] The small transformer shown in each of the above embodiments has a winding section divided by the middle flange 50c. The primary coil 51 is installed in the first winding section and the secondary coil 52 is installed in the second winding section. It has a configuration in which each wire is wound, but a secondary coil is attached to each of the first winding section and the second winding section. A small coil with a configuration in which the primary coil is dividedly wound and the primary coil is dividedly wound on top of this secondary coil. type transformer, small transformer without inner flange 50c, and other choke coils It can also be implemented as a file etc.

[0019]

[Effect of the idea]

As mentioned above, the small winding component according to the present invention has a terminal pin attached horizontally to the bobbin collar. is bent upward, and its tip side is bent sideways. , so it can be inserted deeper into the mounting hole of the mounting board for installation. This is a compact transformer that can further reduce the height from the attached board surface to the top of the transformer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a printed wiring board and a small transformer.

FIG. 2 is a longitudinal sectional view of a small transformer attached to a printed wiring board.

FIG. 3 is an enlarged cross-sectional view showing a terminal pin portion in FIG. 2;

FIG. 4 is an enlarged sectional view similar to FIG. 3 showing another embodiment of the terminal pin.

FIG. 5 is a perspective view showing a conventional example of a printed wiring board and a small transformer.

FIG. 6 is a longitudinal sectional view showing a conventional small transformer attached to a printed wiring board.

[Explanation of symbols]

50 bobbin 50a, 50b edge guard 50c Nakatsuba 51 Primary coil 52 Secondary coil 54, 55 terminal pin 56, 57 E type core 58 Printed wiring board 59 Mounting hole 60 terminal pin

Claims (1)

[Scope of utility model registration request] Claim 1: A bobbin with a flange, a coil wound on the bobbin, and a terminal pin projecting laterally from the lower outer surface of the bobbin flange, the lower portion of which is inserted into a mounting hole formed in a mounting board. In a small wire-wound component having a configuration in which a terminal pin is soldered onto the surface of the mounting board, the terminal pin is bent upward from near the outer surface of the bobbin collar, and further, the tip side thereof is bent sideways. A small wire-wound component characterized by: