JPH07201596A - Surface mount type coil parts - Google Patents

Abstract

PURPOSE:To reduce the mounting area of a surface mount type coil having a drum type core and solve problems automatic mounting. CONSTITUTION:Protrusions 14a and 14b for providing parallel opposed positioning planes 13 griped by positioning part of an automatic mounting apparatus are radially formed on a base 16 and lead terminals are composed of winding terminals 17 independently protruding from winding ends and mounting terminals 18 integrated with the terminals 17, exposed at the bottom face of the base and used for electrical connection to a mounting board. The terminals 17 are disposed within a regions A-D defined by extensions S1 of the planes 13 and lines S2 circumscribing the disclike base 16, intersecting S1 at right angles and the terminal 18 is disposed between the protrusions 14a and 14b within the plane 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mounting type coil component such as a noise filter or a choke coil which is surface mounted on a circuit board of an electronic device, and more particularly, a structure of a pedestal and a lead terminal for reducing the surface mounting floor area. It is about.

[0002]

2. Description of the Related Art In recent years, there is a strong consumer demand for miniaturization and high performance of electronic devices and the like, and along with this, transformers and noise filters for coil components occupying a relatively large floor area in electronic components mounted on electronic circuit boards. As for the choke coil and the like, a surface mounting type coil component having a structure using a drum type core suitable for surface mounting has been developed while achieving miniaturization and thinning.

For example, especially in a choke coil, DC / D
In a high-frequency choke coil used in a C converter, an inverter, etc., a drum-shaped core made of a magnetic material, in which a flange is provided at each of an upper end and a lower end of a columnar coil winding section generally arranged in a vertical direction. A surface mount type in which a winding is wound around the coil winding shaft portion is often used.

FIGS. 7 and 8 are perspective views showing a structural example of the conventional surface-mount type high frequency choke coil.

In FIG. 7, a high frequency choke coil 10 is shown.
Is a drum-shaped core 3 having a winding shaft portion 1 around which a winding 4 is wound and flanges 2a and 2b having a circular planar shape, and the drum-shaped core 3 is adhesively fixed and an end portion of the winding 4 is provided. The planar shape in which the lead terminals 5a to 5f for connecting the terminals are planted is a square pedestal.

Further, in FIG. 8, the high frequency choke coil 20 has a structure characterized in that the pedestal has a disk-shaped pedestal instead of the above-mentioned quadrangular shape.

In each of the high frequency choke coils, the lead terminals 5a ... Are projected in the radial direction from the side surface of the pedestal and bent into an S-shape so that the tip thereof contacts the surface of the mounting substrate. Further, the lower flange 2b of the drum-shaped core 3 is adhered and fixed to the upper surface of the pedestal 6 or 7 substantially at the center thereof, and the end of the winding 4 is entangled with one pedestal root portion of the lead terminals 5a. The high frequency choke coil 10 is constructed by performing a winding operation of winding the drum core 3 around the winding shaft portion 1 and winding it around other lead terminals, and then solder dipping the lead terminals 5a. Further, the same configuration is applied to other surface mount coil components such as transformers.

Since the drum type core 1 generally has a high resistivity, ferrite (nickel zinc ferrite, manganese zinc ferrite, etc.) which is an oxide magnetic material generally used as a high frequency magnetic core material is usually used.

By the way, when mounting a surface-mounting type small electronic component on a mounting board, an automatic mounting apparatus is generally used at present.

When mounting the surface mount type coil component, as can be seen from the plan view of FIG. 9, the suction nozzle port 8 of the automatic mounting apparatus sucks onto the flat surface of the collar portion 2a above the drum core 3. And part 11 for positioning in the horizontal direction
a and 11b (hereinafter, also referred to as mechanical chucks) sandwich and hold the high frequency choke coil 10 from the side surface of the base 6 to accurately give a horizontal direction. Even if the horizontal direction does not match at the time of adsorption, since the parts 11a and 11b that perform the horizontal positioning are parallel, the side faces 6a and 6b of the pedestal are pinched even if the horizontal direction is misaligned. The horizontal direction of the pedestal 6 is corrected.

By the above operation, the surface mount type coil component including the high frequency choke coil is correctly mounted on the mounting board.

[0012]

However, in the mounting of the coil component by the automatic mounting apparatus, since the mechanical chuck comes into contact with the side surface of the coil component and grips the coil component, the lead terminal structure of the conventional high frequency choke coil 10 has the following problems. When the side on which the lead terminals 5a are arranged is sandwiched, there is a problem in that the load is applied and the lead terminals 5a are bent, which in turn causes defects such as product flapping and disconnection.

Further, as can be seen from FIG. 9, the pedestal 6 having a square or rectangular plane shape has a large mounting width X in the direction in which the lead terminals 5a ... Are present, and the floor area occupied by unnecessary four corner portions is an occupied floor area. It becomes large, which is disadvantageous for high-density mounting.

On the other hand, the disk-shaped pedestal 7 such as the high frequency choke coil 20 has the smallest floor area and seems to be suitable for high-density mounting, but has lead terminals protruding from it.
Substantially occupied floor area is not so small. Also,
Since the side surface of the pedestal is a curved surface, the mechanical chuck of the automatic mounting apparatus does not have a flat surface that comes into contact with the side surface of the coil component to pinch and grasp it, so that the structure cannot correct the horizontal direction, which is not suitable for mounting by the automatic mounting apparatus.

The present invention has been made in view of the above circumstances, and provides a pedestal structure and a terminal structure for reducing the floor area of a surface mounting type coil component using a drum type core and solving the above-mentioned problems during automatic mounting. It is provided.

[0016]

SUMMARY OF THE INVENTION According to the present invention, a drum-shaped core having a circular shape in which a winding is wound, and a lead terminal for bonding and fixing the drum-shaped core and connecting the winding are implanted. In a surface mount type coil component having a pedestal whose basic shape is a disk shape, the pedestal of the pedestal is provided with parallel parallel positioning planes for grasping by the position locating portion of the automatic mounting device. A barb terminal protruding in the radial direction, the lead terminal independently protruding for barking of the winding end, and a lead terminal integrally molded with the barb terminal and exposed on the bottom surface side of the pedestal to be electrically conductive with the mounting substrate. Mounting terminal for connection,
Further, the barbed terminal is installed so as not to protrude from a range surrounded by an extension line of the positioning plane and a circumscribed line of a disk-shaped pedestal orthogonal to the extension line, and the mounting terminal The present invention achieves the above object by providing a surface-mounted coil component, characterized in that it is sandwiched between the protrusions and is installed so as not to protrude from the positioning plane. .

[0017]

In the present invention, the protrusion provided on the pedestal does not move from the horizontal direction in the state where it is adsorbed by the nozzle so that the portion (mechanical chuck) for positioning the automatic mounting device accurately determines the horizontal direction. Because of the pinch and grip, the coil components are rotationally straightened to provide the correct horizontal orientation.

As a method of connecting the winding wires by twisting, the lead terminals are twisted to the winding wire dedicated to the winding wire, which is independently projected from the pedestal. Does not affect the mounting terminals.

The mounting terminal integrally formed with the barbed terminal is electrically connected, and is exposed from the inside of the pedestal in a state of being closely adhered to the bottom surface side of the pedestal, bent and sandwiched between the protrusions, and positioned. Since the mechanical chuck is configured so as not to protrude from the mounting flat surface, when the mechanical chuck grips the positioning flat surface of the protrusion on the side surface of the pedestal, the mechanical chuck does not touch the mounting terminal and apply a load. Absent.

Since the pedestal has a disk-shaped basic shape, and the projections provide a positioning plane and are suppressed to the minimum amount of projection necessary for sandwiching the mounting terminals, the floor area is generally the minimum area. Become.

It should be noted that the respective positioning planes of the projections provided at the opposite positions on the side surface of the pedestal face the front surface and are hardly displaced (for example, they are not in a positional relationship such as the opposite sides of a parallelogram). Therefore, when the mechanical chuck is sandwiched and gripped, there is no action of giving a rotational force. Therefore, stable positioning in the horizontal direction is performed by the mechanical chuck.

[0022]

Embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the same reference numerals are used for members having the same shape.

FIG. 1 is an exploded perspective view for explaining a high frequency choke coil as a typical example of a surface mount type coil component according to claim 1 of the present invention, and FIG. 2 is a plan view of the same high frequency choke coil. . 3 is a bottom view of the same high frequency choke coil, and FIG. 4 is a vertical sectional view of the same high frequency choke coil taken along the mounting terminals.

1 and 2, the choke coil 3
A reference numeral 0 is a disk-shaped basic shape in which a drum-shaped core 3 having a circular planar shape in which a winding 4 is wound, and a lead terminal for connecting the winding 4 to the drum-shaped core 3 are fixed. 1. A surface mount type coil component having a pedestal 16 and a protrusion 1 for providing parallel opposing positioning planes 13 for grasping and gripping by a positioning section of an automatic mounting apparatus.
4a and 14b are projected in the radial direction of the pedestal 16, and
A barb terminal 17 in which the lead terminal independently protrudes for a bark at the end of the winding wire, and a mount which is integrally molded with the barb terminal 17 and is exposed on the bottom surface side 21 of the pedestal for conductive connection with a mounting board. The barbed terminal 17 is formed of a terminal 18, and the barbed terminal 17 is surrounded by an extension line S1 of the positioning flat surface 13 and an outer tangent line S2 of the disk-shaped pedestal 16 that is orthogonal to the extension line S1. In this embodiment, the mounting terminals 18 are installed so as not to protrude from A and C), and the mounting terminals 18 are provided with the protrusions 1.
It is arranged so as to be sandwiched between 4a and 14b and not to protrude from the positioning plane 13.

More specifically, the drum-shaped core 3 is formed by pressure molding of ferrite powder, which is generally used as a magnetic material.
It is a sintered product, and has flanges 2a and 2b at both ends, and a winding shaft 1 around which a winding is wound in the center.

Ferrite, which is the material of the drum-shaped core 3, is an oxide magnetic material and has a relatively large resistance and a small high-frequency loss. Therefore, it is generally used as a magnetic material for high frequencies. There are types such as nickel-cobalt type ferrite, nickel-zinc type ferrite, and manganese-zinc type ferrite.

Next, the pedestal 16 is made of synthetic resin, for example, a thermoplastic resin such as polybutylene terephthalate (PBT) or polyethylene terephthalate (PET) or a thermosetting resin such as melamine resin or phenol resin is injection molded. Made. A fitting recess is provided on the upper surface of the pedestal 16 in which most of the lower brim portion 2b of the drum core 3 is embedded, which has a structure that contributes to height reduction.

Next, the winding 4 is an insulating coated conductive wire such as an enamel coated conductive wire or a polyurethane coated conductive wire, and in the case of a transformer, it is wound as primary and secondary windings in an overlapping manner.

The barb terminal 17 and the mounting terminal 18 are formed by integrally molding an iron-based metal such as Kovar or 42 alloy or a copper-based metal such as phosphor bronze or iron-containing copper and solder-plating them. As shown by the broken line, they are connected inside the pedestal 16.

The above-mentioned two baring terminals 17 are terminals independently protruding to the side surface of the pedestal for curling and soldering the ends of the windings 4 regardless of the conductive connection with the mounting board. As is clear from FIG. 2, do not protrude from the ranges A and C surrounded by the extension line S1 of the positioning plane 13 and the circumscribed line S2 of the disk-shaped pedestal 16 orthogonal to the extension line S1. Since it is installed, the mechanical chuck does not touch and the terminals do not bend.

As a matter of course, the mounting terminal 18 integrally formed with the above-mentioned barbed terminal 17 is electrically connected, and as shown in the longitudinal sectional view of FIG.
1 is exposed in a state in which it is in close contact with the substrate 1, is bent upward, is sandwiched between the protrusions 14a and 14b, and is a flat surface 1 for positioning.
3, the mechanical chuck of the automatic mounting apparatus has the protrusions 14a, 14 on the side surface of the pedestal.
It is obvious that the mechanical chuck does not apply a load by touching the mounting terminal 18 when the positioning flat surface 13 of b is sandwiched and gripped. Further, since it is bent upward, there is an advantage that the quality of soldering at the time of mounting can be visually confirmed by the solder state of the bent portion.

By the way, in FIG. 2, the protrusions 14a, 1a provided at opposite positions on the side surface of the base 16 in the present invention.
The two sets of positioning planes 13 of 4b face each other in the front and are not substantially displaced (for example, they are not in a displaced positional relationship like the opposite sides of a parallelogram), so that the mechanical chuck rotates when gripped. There is no action that gives force. Therefore, stable positioning in the horizontal direction is performed by the mechanical chuck. If this is a shape in which two opposite corners of a pedestal with a square quadrangle are cut diagonally, and the surface of the uncut portion is sandwiched by mechanical chucks, the positioning plane is as if it were a parallelogram. Since there is a positional relationship such that the sides face each other as opposed to each other, there is a possibility that the force sandwiched by the mechanical chucks may cause a rotational moment to exert a rotational force on the mechanical chucks themselves. In this respect, the protrusions 14a and 14b are provided on the disk-shaped base 16.
There is an advantage of the present invention in which the positioning plane 13 is newly provided by providing.

Even in a transformer which requires, for example, four terminals other than the high frequency choke coil, the barbed terminals 17 are symmetrically arranged in the ranges A to D in FIG. 2 and the integrally formed mounting terminals 18 are symmetrical. It goes without saying that it is possible if they are arranged at four locations. In this case, it may be better to make the corners slightly smaller so that the terminals do not touch inside the pedestal. Alternatively, providing a step inside the pedestal to arrange the terminals is considered to be effective for preventing contact.

As can be seen from FIG. 2, in the surface mount type coil component having the above-described structure, the basic shape of the pedestal is the disk shape, which is the same as the conventional example of FIG.
Since the protruding area of 14b is very small, it can be said that it has a minimum floor area and is suitable for high-density mounting.

In addition, as a reminder, the surface mount type coil component according to the present invention is a coil component having a drum-shaped core having a circular planar shape and a pedestal having a disk-shaped pedestal for mounting the drum-shaped core. Needless to say, there is no limitation on the use and product type, and the present invention is not limited to the above embodiment.

For example, FIG. 5 is a view for explaining a second embodiment of the high frequency choke coil according to the present invention. As can be seen from the plan view of FIG. 5A and the front view of FIG.
Has a width d equal to the diameter of the flange portion 2b of the drum core 3,
Also, the protrusions 24a and 24b that provide the positioning plane 13
Is not a trapezoidal shape as described above (see FIG. 1) but a thin plate-shaped protrusion. In this structure, the floor area is further smaller than that in the above-mentioned embodiment.

FIG. 6 is a diagram for explaining a third embodiment of the high frequency choke coil according to the present invention. As can be seen from the plan view of FIG. 6A and the front view of FIG. The width d of the pedestal 36 in the embodiment is smaller than the diameter of the flange portion 2b of the drum core 3. in this case,
The planar shape of the pedestal does not have to be circular as long as it does not protrude from the flange portion 2b, but as a result, it is preferable that the basic shape is a disk shape because the drum-shaped core has a good sitting quality.

[0038]

Since the surface mount type coil component according to the present invention is constructed as described above, it has the following effects.

(1) It has an excellent effect that the board mounting density can be improved.

(2) It has an excellent effect that the cause of defectiveness of product flapping and disconnection is fundamentally solved and the product yield can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view for explaining a high frequency choke coil as a typical example of a surface mount type coil component according to the present invention.

FIG. 2 is a plan view of the same high frequency choke coil.

FIG. 3 is a bottom view of the same high frequency choke coil.

FIG. 4 is a vertical sectional view of the same high frequency choke coil taken along a mounting terminal.

5A and 5B are diagrams illustrating a second embodiment of the high frequency choke coil according to the present invention, FIG. 5A being a plan view and FIG. 5B being a front view.

6A and 6B are diagrams illustrating a third embodiment of the high frequency choke coil according to the present invention, FIG. 6A being a plan view and FIG. 6B being a front view.

FIG. 7 is a perspective view showing a first structural example of a conventional surface mount type high frequency choke coil.

FIG. 8 is a perspective view showing a second structural example of a conventional surface mount type high frequency choke coil.

FIG. 9 is a plan view for explaining mounting by the automatic mounting apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Winding shaft part 2a, 2b Collar part 3 Drum type core 4 Winding 5a, ... Lead terminal 6, 7, 16, 26, 36 Base 6a, 6b Side of base 8 Adsorption port 10, 20, 30 High frequency choke coil 11a, 11b Horizontal positioning portion (mechanical chuck) 13 Positioning flat surface 14a, 14b, 24a, 24b Projection portion 17 Barrel terminal 18 Mounting terminal 21 Pedestal bottom side S1 Extension line S2 Outer tangent lines A to D S1 and S2 Area surrounded by X Mounting width d Pedestal width

Claims (1)

[Claims] 1. A disk-shaped basic shape having a drum-shaped core having a circular shape in which a winding is wound and a lead terminal for bonding and fixing the drum-shaped core and connecting the winding. In a surface mount type coil component including a pedestal,
The protrusions are provided in the radial direction of the pedestal so as to provide parallel and parallel positioning planes for gripping and grasping by the portion for performing positioning of the automatic mounting apparatus, and the lead terminals are used for bending the winding end portion. The barbed terminal independently protrudes, and the mount terminal integrally formed with the barbed terminal and exposed on the bottom surface side of the pedestal to electrically connect to the mounting board. It is installed so that it does not protrude from the area surrounded by the extension line of the mounting plane and the circumscribed line of the disk-shaped pedestal that is orthogonal to the extension plane, and the mounting terminal is sandwiched between the protrusions and the positioning plane. A surface-mount type coil component characterized in that it is installed so that it does not protrude.