JPS62257708A - Inductor - Google Patents

Abstract

PURPOSE:To prevent a bobbin on which coil is wound from being raised up due to coil terminals during packaging of the bobbin to a printed circuit board or during soldering thereof and to enable it to be mounted stably, by attaching terminals to the side ends of the bobbin, each terminal being inclined such that the distance between the terminal and the corresponding side face becomes larger towards the bottom face, and by connecting the terminal end of the coil to the inclined portion of the terminal. CONSTITUTION:Terminals 3 are attached to side faces 102b and 102c of collars 102 partitioning coil-wound sections 101 of a bobbin 1. The attached portion 32 of each terminal 32 is bent so as to lie on the same plane with the bottom 102 of the bobbin 1 and in parallel with the bottom face 102a. The other end 33 of the terminal 3 is bent and buried in the bobbin 1. A terminal end 21 of coil 2 wound on the bobbin 1 is connected to the inclined portion 31 of the terminal 3 by binding it around the portion 31. Since the terminal 3 is inclined such that the distance between the terminal and the end face 102b or 102c becomes greater toward the bottom face 102, the coil can be packaged on a conductor pattern of a printed circuit board with the terminal end 21 of the coil bound on the inclined portion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an inductor used to construct various filters or delay lines. When configuring a mounting type inductor, by pulling out the terminal from the middle of the side of the pobbin at an angle toward the bottom, it is possible to easily connect the coil terminal to the terminal, and to reduce the electric power when mounted on one side. This improves the stability and reliability of physical and mechanical connections, and also eliminates the negative influence of the terminals on the pobbin molding die, making it possible to perform the pobbin molding operation reliably.

[Prior art] Delay lines as shown in Fig. 5 or 6 have been known for use in timing adjustment of computers, various control equipment, demodulation circuits, oscillation circuits, radar position detection, and color televisions. First, the delay line shown in FIG. 5 connects inductors L1 to Ln in series,
The circuit has a circuit configuration in which a capacitor C1"Cn is connected to each connection point. Next, the delay line shown in Fig. 6 is called an induction M type, and an intermediate tap is provided in each of the inductors L1 to Ln. Capacitor 01 in the middle tap
~Cn is connected to the circuit.

Note that the winding structure shown in Japanese Utility Model Publication No. 1557/1983 is applied to the winding coupling of the inductor when obtaining the above-mentioned delay line.

As conventional examples of the above-mentioned inductors, those having structures shown in FIGS. 7 to 9, for example, are known. In FIGS. 7 to 9, reference numeral 1 indicates a pobbin in which a coil 2 is continuously wound around a plurality of coil winding portions 101 partitioned along the coil winding axis direction.

The pobbin 1 is made of a composite resin ferrite which is a mixture of ferrite powder and synthetic resin. When winding the coil 2 around the pobbin 1, it is preferable to use a wooden wire rod and continuously wind it from one coil winding part 101 to the next coil winding part 101.

The coil winding portions 101 of the pobbin I are separated from each other by a collar portion 102 provided therebetween. The coil winding portion 101 is formed to have a circular cross section, and the flange portion 102 is formed to have a rectangular cross section larger than the outer shape of the coil winding portion 101. The bottom surface 102a of the collar portion 102 is used as a mounting surface.

3 is formed directly on the pobin L, and is connected to the coil terminal 21 of the coil 2.
This is the terminal for connecting. In FIG. 7, the terminal 3 is drawn out horizontally in parallel from the bottom surface 102a using a metal plate material, and
In the figure, the side surface 102b or 10 is made of a similar metal plate material.
A drawer extends from the middle of 2c in a direction parallel to the bottom surface 102a. Further, in FIG. 9, a terminal 3 formed from a metal plate material into a crank shape is used. That is, the drawer portion 33 pulled out laterally from the side surfaces 102b and 102c of the pot bin I
is bent at a substantially right angle in the direction of the bottom surface 102a to form a raised portion 31, and further bent laterally in the vicinity of the bottom surface 102a to form a crank-shaped mounting portion 32, and a coil is attached to the pull-out portion 33. The terminal 21 is wrapped around it.

Problems to be Solved by the Invention However, the conventional inductor described above has the following problems.

(L) In the case of FIG. 7, the terminals 3 formed using a metal plate are drawn out horizontally in parallel from the bottom surface 102a, so they are provided on one surface of one circuit board 4 as shown in FIG. Surface mounting can be performed on the conductor pattern 43 that has been formed. However, since the coil terminal 21 is connected to the portion that is connected and fixed to the conductor pattern 43, the coil wire diameter is lifted up, which is disadvantageous in achieving a thinner structure. Moreover, when one terminal 3 is attached half LU 5 during surface mounting on one circuit board 4L, other unsoldered terminals 3 float up from above the circuit board 4, and the conductor pattern 43
A gap gl is generated between the terminal 3 and the terminal 3. For this reason, there is a problem in that the reliability of soldering the floating terminals 3 is significantly reduced.

(b) In the case shown in Fig. 8, there is no floating due to the coil terminal 21, but if the terminal 3 is installed from the bottom surface 102a with variations in height, as shown in Fig. gSl1,
A cap g2 is formed between the conductor pattern 43 and the terminal 3, which causes problems such as the occurrence of some terminals 3 not connected to the conductor pattern 43, resulting in a lack of reliability. Furthermore, when one terminal 3 is soldered 5, other unsoldered terminals may float up, as in the case of FIG. 10.

(C) In the case shown in FIG. 9, the mounting is performed by mounting the part 32 on the conductor pattern of the printed circuit board, thereby preventing the coil terminal 21 from lifting up and the soldering process from lifting up during soldering, making it stable. The advantage is that it can be surface mounted.

However, the coil terminal 21 needs to be tied to the recessed drawer part 33 of the terminal 3, which requires extra binding space, and the process of binding the coil terminal 21 becomes very troublesome. If the vertical dimensions and bending angles of the terminals 3 vary due to forming errors, there are problems such as damage to the molding die.

Next, this point will be explained.

FIG. 12 is a diagram illustrating coil terminal processing in the inductor shown in FIG. 9. In this type of inductor, the height hl of the flange 102 of the bobbin l is approximately 1.3a+m,
The width d3 is approximately 1.6 mm, and the distance f from the side surfaces 102b and 102C to the tip of the mounting portion 32! It is normal that l d 2 is limited to about
2b or 102C is approximately 0.7 mm. Further, the coil 2 uses a wire having a diameter of about 0.1 mm, and is generally wound several turns in order to ensure reliability of mechanical and electrical connection. Therefore, it is not preferable to form the terminal 3 after the coil end 21 is tied around the terminal 3 because it may damage the wire, and the coil end 21 will inevitably be tied to the terminal after forming.

In the above-mentioned inductor, the coil terminal 21 is tied as follows.
This is done by moving the nozzle of the winding machine around the terminal 3 while feeding out the wire. Therefore, terminal 3
Space is required around the area for the nozzle to move around, but it is impossible to move a nozzle with an outer diameter of about 1m+s as shown by arrow a. The coil terminal 21 has no choice but to be tied to the portion 33. For this reason, the coil terminal 21 is recessed into the drawer portion 3 through the interval d1, which has a minute dimension of about O,'7wtx.
3, and even a slight deviation in the movement path of the nozzle can cause problems such as the tip of the nozzle colliding with the bobbin or the coil terminal 21 getting caught in the mounting part 32. , the distance d1 is approximately 0.7 mm, while the wire diameter is 0.7 mm. ll1i coil terminal 2
1 has to be wound seven turns, and it is difficult to secure a space for winding the nozzle, taking into account errors in the movement path of the nozzle.

Furthermore, after the terminal 3 is formed into a crank shape, it is integrally molded with the bobbin 1 using molding molds A and B, as shown in FIG. 13, but due to forming errors,
As shown by the dotted line (A) in FIG. 13, if there are variations in the vertical dimension or bending angle of the terminal 3,
, H are applied with excessive force to hold the terminal 3 into its normal shape, resulting in damage to the molds A and B.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention includes a bobbin around which a coil is wound, and a terminal attached to the bobbin to connect the coil end of the coil. In the inductor with one surface side of the bobbin as the mounting surface, the terminal is arranged such that the distance between the terminal and the side surface increases toward the bottom surface from halfway along the side surface when viewed in the height direction with the mounting surface as the bottom surface. According to the present invention, the special feature is that #1 is installed obliquely so that the distance between the two is increased. When adding terminals to a pobbin, the distance between the inductor and the side increases as it goes from the middle of the side toward the bottom when viewed in the height direction with the mounting surface of the pobbin as the bottom. Because it is installed at an angle,
Surface mounting is possible by wrapping the coil terminal around the inclined portion and positioning the tip of the terminal without the coil terminal on the conductor pattern of the circuit board. Therefore, floating due to the coil terminal and the half FF3 attachment can be prevented from floating and surface mounting can be performed stably.

Furthermore, by slanting the terminal, a triangular space is created between the side surface of the pobbin and the terminal. Therefore, the coil end can be wrapped below the terminal through this triangular space, making the work of wrapping the coil terminal easier, and by wrapping the coil end around the inclined part, the dimensions can be expanded. You can secure enough binding space without any problems.

Furthermore, by leading out the terminal at an angle from the side of the pobbin, the 7 ohm error of the terminal is absorbed by the pobbin molding space of the molding die and the springiness of the terminal, reducing the loss of the molding die.
In addition to preventing damage etc., sufficient mechanical strength of the molding die can be ensured.

Embodiment FIG. 1 is a perspective view of an inductor according to the present invention, and FIG. 2 is a cross-sectional view thereof. In FIG. ing.

In this embodiment, the pobbin 1 has a plurality of coil winding parts 101 divided in the direction of the coil winding axis.
The coil 2 is continuously wound around the coil 1. The pobbin 1 is a molded product made of resin, composite resin ferrite, dust core, or the like.

The coil winding portion 101 is divided by a rectangular flange 102, and a side surface 102b or 102c of this flange 102
The side surface 102''a or 102c increases toward the bottom surface 102a, which is the mounting surface, from the middle of the
The terminals 3 are installed in a linearly inclined manner so that the distance between the terminals 3 and 3 is increased. The inclined portion 31 of the terminal 3
It is continuously inclined from the side surface 102b or 102c to the inside thereof. Further, the mounting portion 32 of the terminal 3 is bent in a direction parallel to the bottom surface 102a of the pot bin L at a position substantially on the same plane as the bottom surface 102a, and the opposite end portion 33 is bent inside the pot bin L. It is buried inside the potbin 1. Then, the coil end 21 of the coil 2 is tied around the inclined portion 31 of the terminal 3 for connection.

In the case of this embodiment, the terminal 3 is connected to the flange 1 provided on the potbin 1.
From the middle of the side surface 102b or 102c of 02 to the bottom surface 10
2a, the side surface 102b increases toward the bottom surface 102a.
Or because it is installed at an angle so that the distance between it and 102c increases.

The coil terminal 21 is tied around the inclined portion 31, and the mounting portion 32 without the coil terminal 21 is positioned on the conductor pattern of the circuit board to perform surface mounting. Therefore, lifting due to the coil terminal 21 and lifting during soldering are prevented, and stable surface mounting is possible.

In addition, by slanting the terminal 3, the flange 10 of the pot bin 1
2 (7) Between the side surfaces 102b and 102c and the terminal 3,
A triangular space 6 is generated that becomes wider toward the tip. Therefore, through the wide opening of the triangular space 6, the coil terminal 21 can be wrapped around the entire length of the inclined portion 31 of the terminal 3, and there is no need to wrap it in a deep part of the terminal 3. Since there is no coil terminal 21, the work of binding the coil terminal 21 becomes easier.

That is, as shown in FIG. 3, by rotating the nozzle of the single-winding machine in the direction of the arrow mark, almost the entire length of the inclined portion 31 can be used as a binding part for the coil end 21, so a special binding space is saved. coil terminal 2 without the need for
1 can be tied together in sufficient space.

Furthermore, since the bent part between the slope part 31 and the end part 33 is buried inside the pot bin 1, and the slope part 31 is continuous from the inside of the pot bin 1 to the outside, as shown in FIG. When the terminal 3 and the pobbin 1 are integrally molded using the molding molds A and B after forming, even if the dimensions of the inclined portion 31 of the terminal 3 vary due to forming errors,
This variation is absorbed by the internal space C of the molds A and B, which corresponds to the inside of the bobbin I. In addition, even if the angle of the sloped part 31 varies, the bending part that affects the molds A and H is only at one place between the sloped part 31 and the mounting part 32, so the elasticity of the terminal 3 is easily absorbed. For this reason, gold)
JjA, B will not be damaged.

In the above embodiment, an inductor suitable for configuring a delay line made of the circuit shown in FIG. 5 was explained as an example, but it can be similarly applied to an inductor of an induction M-type delay line shown in FIG. 6. It is.

Effects of the Invention As described above, the present invention provides an inductor that has a bobbin around which a coil is wound, and a terminal that is attached to the bobbin and connects the coil end of the coil, and has one side of the bobbin as a mounting surface. In this case, the terminal is installed at an angle from the middle of the side surface toward the bottom surface when viewed in the height direction with the mounting surface as the bottom surface, so that the distance between the terminal and the side surface increases toward the bottom surface. The following effects can be obtained because of the following characteristics.

(a) Tie the coil terminal around the slanted part of the terminal, place the tip without the coil terminal on the conductor pattern of the circuit board, and surface mount it. Prevents lifting and allows stable surface mounting.

(b) The coil can be tied to the inclined part of the terminal, the space for wrapping the coil terminal is expanded, and the binding work becomes easier.

(c) Terminal forming errors are absorbed by the bobbin molding space of the molding die and the spring properties of the terminal, resulting in damage to the molding die ↓
t, to prevent damage etc.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an inductor according to the present invention. Figure 2 is a cross-sectional view of the same, Figure 3 is a diagram showing how the coil end is tied to the terminal, Figure 4 is a diagram showing the relationship between the terminal and the molding die, and Figure 5 is a diagram of the delay line. Fig. 6 is an electrical equivalent circuit diagram of a visiting M-type delay line, Fig. 7 is a perspective view of a conventional inductor, Fig. 8 is a perspective view of another conventional example, Fig. 9 10 is a front view of yet another conventional example, FIG. 10 is a diagram explaining the problem of the inductor shown in FIG. 7, and FIG.
The figure is a diagram explaining the problem of the inductor shown in Figure 8.
FIGS. 12 and 13 are diagrams for explaining the problems of the inductor shown in FIG. 9. l・・War pod 211 @・Coil 311・O terminal 102a・◆War bottom 102b, 102c* a
m side surface 31...slanted part 5 t) l02a
6 Figure 3 Figure 4 Figure 5 rη Figure 7 Figure 8 Figure 13

Claims (8)

[Claims] (1) It has a bobbin around which a coil is wound, and a terminal attached to the bobbin to connect the coil end of the coil,
In the inductor with one surface side of the bobbin as the mounting surface, the terminal is arranged such that the distance between the terminal and the side surface increases toward the bottom surface from halfway along the side surface when viewed in the height direction with the mounting surface as the bottom surface. An inductor characterized in that the inductor is installed at an angle so that the distance between the two increases. (2) A coil terminal of the coil is connected to an inclined portion of the terminal.
The inductor described in section. (3) The terminal is continuously inclined inward from the side surface of the bobbin, as claimed in claim 1.
The inductor according to item 1 or 2. (4) The inductor according to claim 1, 2, or 3, wherein the tip of the terminal is located substantially in the same plane as the bottom surface of the bobbin. (5) The inductor according to claim 1, 2, 3, or 4, wherein the bobbin is made of resin. (6) The inductor according to claim 1, 2, 3, or 4, wherein the bobbin is made of composite resin ferrite. (7) Claims characterized in that the bobbin has a plurality of coil winding parts divided in the direction of the coil winding axis, and the coil is continuously wound around the coil winding parts. Paragraph 1, Paragraph 2, Paragraph 3, Paragraph 4, Paragraph 5, or Paragraph 6
The inductor described in section. (8) The inductor according to claim 7, wherein the coil winding portion is divided by a flange, and the terminal is attached to the flange.