JPH04125419U - surface mount type coil parts - Google Patents

Abstract

(57) [Abstract] [Purpose] When realizing a structure in which a case is joined to a base in a surface-mounted coil component, it is possible to sufficiently protect the curly part of the coil terminal, and to attach the coil to the corner of the base or case. To provide a structure in which disconnection due to terminal contact is unlikely to occur. [Configuration] Coil 3 is fixed on the surface of base 1,
A terminal 4 that connects the coil terminal 3a is fixed to the outer periphery of the coil terminal 3a.
Cover base 1 with case 8. A gap G is formed between the base 1 and the lower side 8d of the case 8 to draw out the coil terminal 3a. The upper corner 1a of the base 1 and the inner side 8e of the lower side d of the case 8, which face each other with a gap G interposed therebetween, are chamfered.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to surface-mounted coil components such as transformers and inductors, and is particularly applicable to base-mounted coil components such as transformers and inductors. Pull out the coil terminal between the case and the base to protect the coil mounted on the base. Regarding the structure of the department.

0002

[Problems to be solved by conventional technology and ideas]

Figure 5(A) shows a surface-mounted pulse transformer, which is an example of a conventional coil component. It is a side view, and is placed on a base 1A made of plastic with double-sided adhesive tape 2, etc. , the coil 3 wound around the toroidal core is fixed, and the end fixed to the end surface of the base 1A The terminal 3a of the coil 3 is attached to the terminal 4 and soldered. However, this conventional structure According to Since the coil 3 is exposed, there is a problem that the coil 3 cannot be protected.

0003 Figure 5(B) shows another conventional example of coil parts, with coil 3 mounted on base 1B. Then, the resin 5 is integrally transferred with the terminal 6 made of a lead frame. The terminal 6 is curved along the outer wall of the resin 5 to make it a surface mount type. Book Although the structure is highly reliable, it is expensive, and the lead frame manufacturing process requires Since the process involves forming the fat 5 and also includes a bending process, there are many steps in the series. There was a problem in that productivity was low because it took a long time.

0004 In order to solve these problems, it is possible to cover the base with a case. . If you want to fix the case to the base and cover the coil, the coil terminal should be In order to pull it out to the child side, a gap must be created between the base and the case, If this gap is too large, the coil terminal will not be sufficiently protected by the case, and vice versa. If the gap is too small, the coil end will come into contact with the corner of the base or case, resulting in a thin wire coil. There was a problem in that there was a high risk that the cable would be disconnected.

[0005] In view of these problems, the present invention is based on surface-mounted coil components. When creating a structure that joins the cases, it is important to ensure that the exposed parts of the coil terminals are adequately protected. Also, wire breakage may occur due to the coil terminal coming into contact with the corner of the base or case. The purpose is to provide a structure that is difficult to damage.

[0006]

[Means to solve the problem]

This invention fixes the coil on the base surface and wraps the coil terminal around the base. A surface-mounted coil component with a structure in which the terminal is fixed and a case is placed over the base. Then, form a gap between the base and the bottom side of the case to pull out the end of the coil. At the same time, the upper corner of the base and the inside of the lower side of the case, which face each other through the gap, It is characterized by being chamfered.

[0007]

[Effect]

In this invention, the upper corner of the base and the inside of the lower side of the case face each other through a gap. By chamfering, the above-mentioned gap for pulling out the coil terminal is secured enough. In order to ensure this clearance, the lower side of the case should be placed close to the coil terminal hanger. construction can be realized.

[0008]

【Example】

Figures 1 and 2 show an embodiment of the coil component according to the present invention, with coil pulls on both sides of the base. The longitudinal sectional views shown in FIGS. 3(A), (B), and (C) are respectively for the projecting portion. A front view, a side view, and a plan view of the embodiment, and FIG. 4 is an exploded perspective view of the embodiment. 1 is a nearly rectangular plastic base, 3 is a coil fixed to the surface of the base. It is wound around a toroidal core and forms a pulse transformer. 4 is an example integrated into the base 1 so as to protrude from the two mutually opposite sides of the base 1 The molded terminal 8 is a plastic case. Base 1 of this example is Fully aromatic polyester thermoplastic liquid crystal polymer (Cida manufactured by Nippon Petrochemical Co., Ltd.) (registered trademark)), and the polymer consists entirely of rod-shaped, rigid molecules. , has excellent heat resistance (melting point is approximately 420°C), strength, weather resistance, and dimensional stability. . As an example, the base 1 is set to have vertical and horizontal widths of about 4 mm x about 5 mm. The base 1 The upper corners 1a of the two sides on which the terminal 4 is fixed are rounded or tilted as shown in the figure. It is chamfered to form a slope. On the other hand, the coil terminal drawer side of case 8 The inner side 1e of the lower side 1d of the surface is chamfered to form an R surface or an inclined surface as shown. do.

[0009] The coupling structure of case 8 to base 1 is as follows. The surface of base 1 That is, protrusions 1b are formed at the four corners of the mounting surface of the coil 3. On the other hand, case 8 has an opening on the bottom. The case 8 of this embodiment is a plastic case having an approximately square shape. Like Base 1, it is made of thermoplastic and heat-resistant liquid crystal polymer, and there are strips on the four corners inside. A topper 8a is formed, and extending pieces 8b extending downward are provided on two opposing sides of the bottom opening. A locking piece 8c is formed on the inner surface of the extending piece 8b. On the other hand, terminal 4 of base 1 A concave locking portion 1c for locking the locking piece 8c is formed on the two sides to which the locking piece 8c is not fixed. do.

0010 When assembling this coil component, place the coil in the area surrounded by the protrusion 1b of the base 1. The coil 3 is placed on the base 1 so that the coil 3 is positioned. This will cause the coil 3 is positioned on the base 1 with its horizontal movement being prevented by the protrusion 1b. like this Then, while preventing free movement of the coil 3, tie the coil terminal 3a to the terminal 4, and Tatsuke 9 (see Figure 1). Then, from the top of coil 3 to base 1. The coil 3 is fixed to the base 1 by dropping adhesive and curing it. next , cover the base 1 with the case 8, press the locking claw 8c against the side surface of the base 1, and remove the extension piece 8. b while pushing it open, and insert the locking claw 8c into the concave locking part 1c on the side of the base 1. At the same time, the protrusion 1 of the base 1 is engaged with the stopper 8a to prevent the base 1 from coming off. By contacting b, further immersion of the base 1 into the case 8 is prevented. Ru. In this way, when the case 8 is fixed to the base 1, as shown in FIG. , a gap G between the base 1 and the lower side 8d of the case 8 for pulling out the coil terminal 3a is formed. form between. This gap G covers the chamfered portions 1a and 8e of the base 1 and case 8. By providing this, it can be made larger, so as shown in Figure 1, the lower side of the case 8d A structure in which the distance H between the terminal 4 and A covered structure can be realized. Moreover, as shown in FIG. 1, the coil terminal 3a is connected to the core. When pulled out from the bottom, the coil terminal 3a contacts the chamfered portion 1a on the base 1. However, since this abutting part is chamfered, the chance of wire breakage is reduced. Ru. Moreover, as shown in FIG. 2, when the coil terminal 3a is pulled out from the upper side of the core, However, the coil terminal 3a may come into contact with the chamfered portion 1e on the lower side of the case 8. In this case as well, the incidence of wire breakage is reduced.

[0011] In addition, in this example, the protective effect of the coil terminal 3a by the case 8 is further improved. In order to raise the outer surface 8f of the lower side 8d of the case from the coil end binding part 10 of the terminal 4. This allows objects to be placed on the outside of the coil terminal during assembly work, etc. This prevents the coil 3 from breaking due to collision with the vicinity thereof.

0012 In the above embodiment, the base 1 has a rectangular shape, but other polygons may be used. It may be formed into a rectangular or circular shape. Also, fixing the case 8 to the base 1 is Alternatively, other means such as adhesion may be used.

[0013]

[Effect of the idea]

According to the present invention, the coil is protected by providing a case to the coil component. , we can provide coil parts that can be automatically installed, and can also be molded in one piece. Not only is manufacturing easier in comparison, but it is also easier to pull out the terminal of the coil. A gap is formed between the base and the lower side of the case, and the pair is connected through the gap. The upper corner of the base and the inside of the lower side of the case are chamfered so that the coil terminal can be pulled out easily. The structure has a structure that provides sufficient clearance for the coil and covers the exposed portion of the coil end. realizable. Also, since the contact part of the coil terminal is chamfered, the contact part of the coil terminal is chamfered. The incidence of wire breakage due to contact is reduced, improving yield.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of a coil component according to the present invention.

FIG. 2 is a side cross-sectional view showing the opposite side of the coil component of FIG. 1;

FIGS. 3A, 3B, and 3C are a front view, a side view, and a plan view, respectively, of the embodiment.

FIG. 4 is an exploded perspective view of the embodiment.

FIG. 5(A) is a side view showing an example of a conventional coil component, and FIG. 5(B) is a sectional view showing another example of the conventional coil component.

[Explanation of symbols]

1, 1A, 1B base 1a Chamfered part 1b Protrusion 1c Locking part 2 Double-sided tape 3 coil 4, 6 terminal 5 Resin 8 cases 8a Stopper 8b Extension piece 8c Locking claw 8d bottom side 8e Chamfered part G gap

Claims (1)

[Scope of utility model registration request] [Claim 1] A surface-mounted coil component having a structure in which a coil is fixed to the surface of a base, a terminal for tying the coil terminal is fixed to the outer periphery of the base, and a case is placed over the base, in which the terminal of the coil is pulled out. is formed between the base and the lower side of the case, and the upper corner of the base and the inner side of the lower side of the case that face each other through the gap are chamfered.