JPH0747855Y2 - Surface mount coil for printed wiring board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a surface mount coil for a printed wiring board.

(Prior Art) Various components mounted by soldering on the wiring pattern surface of a printed wiring board must be made as small and thin as possible in order to improve the mounting density. The same applies to the types.

Therefore, for example, a transformer having a configuration as shown in FIG. 1 has been proposed. That is, for example, a winding portion (1) having a hollow portion (1a) for inserting a core in the central axis direction.
And a pedestal part (2) integrally formed with the winding part (1) protruding leftward and rightward in the central axis direction of the winding part (1) at the lower part, and horizontally protruding from the side surface of the pedestal part (2). The barbed connection part (3a) at the winding end and the pedestal part (2) protruding parallel to the lower surface of the pedestal part (2) have a length that does not project outside, and the barbed connection part (3a) and this Integrated soldering part (3
b) and bobbin (4) provided with connection terminal part (3) fixed to pedestal part (2) so as to form a staggered arrangement. After winding the primary, secondary, and tertiary windings (5) of the transformer on the winding portion (1), the winding ends of the windings are connected to the connection portion (3a). It has a structured structure.

According to this structure, as shown in FIG. 2, a conventional structure, for example, a barb connecting portion (3a) protruding from the side surfaces of the left and right pedestal portions (2) in an eight shape, and a horizontal connecting member connected thereto. The width of the transformer can be made smaller than that in which the connection terminal (3) including the soldering portion (3b) in the direction is fixed to the pedestal portion (2). Further, as shown in FIG. 3, the barbed connection portion (3a) which is vertically projected on the lower surface of the pedestal portion (2) and the soldering portion (3b) having a length projecting to the outside of the pedestal portion (2) perpendicular to this. The height can be made lower than that in which the connection terminal part (3) consisting of (1) and (3) is fixed to the pedestal (2).

Further, as shown in FIG. 4, a barb connecting portion (3a) horizontally protruding from the side surface of the pedestal portion (2) and an L-shaped portion integrally formed with the barb connecting portion (3a) and protruding from the lower surface of the pedestal portion (2). There is an advantage that both the width and the height can be made smaller than the one having the connection terminal portion (3) including the soldered portion (3b). Moreover, the fourth
As in the case of the figure, the barbed connection part (3a) and the soldering part (3b) are arranged in a zigzag pattern, and the soldering part (3b) does not project outside the pedestal part (2). There is an advantage that the winding end of the winding connection portion (3a) can be easily peeled off.

(Problems of the prior art) However, on the other hand, in the proposed structure as shown in FIG. 1, since the soldering portion (3b) does not project outside the pedestal portion (2), the soldering portion cannot be seen from above. , It is hard to see from the side because it is disturbed by other mounted parts. Therefore, it is difficult to see the soldering status when soldering a transformer that is positioned on the printed wiring board wiring pattern using cream solder, for example, and it is possible to confirm the quality of the soldering. Since it is difficult, a soldering defect may be overlooked, which may lead to a decrease in reliability.

(Object of the Invention) The object of the present invention is to provide coils which can solve the above problems of the present invention.

(Means of the Invention for Solving Problems) FIG. 5 is a partially enlarged perspective view of an embodiment of the invention (first, second,
The same reference numerals as those in FIGS. 3 and 4 show the same portions), and the features of the present invention are as follows. That is, the pedestal portion (2) in the proposed structure of FIG. 1 has a vertical groove (6) penetrating the pedestal portion (2) having a width wider than the width of the soldering portion (3b) of the connection terminal portion (3). It is characterized by being provided.

(Effects of the Invention) With the above configuration, when the transformer is soldered to the wiring pattern of the printed wiring board, the solder is soldered through the gap between the soldering portion (3b) and the vertical groove (6). It rises on the upper surface of (3b), and this raised state can be easily and surely observed from the top by the vertical groove (6). On the other hand, whether the soldering is good or bad can be roughly determined by how the solder rises on the upper surface of the soldering portion (3b), so that it is possible to eliminate the risk of overlooking the soldering failure. Therefore, according to the present invention, the surface mounting for a printed wiring board is smaller and thinner than the conventional structure, the winding end can be easily twisted, and the soldering connection can be performed with high reliability. A mold coil can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory view of a surface mount type coil which is a target of the present invention,
2, 3 and 4 are explanatory views of a conventional surface mount type coil, and FIG. 5 is an explanatory view of one embodiment of the present invention. (1) …… winding part, (1a) …… hollow part, (2) …… pedestal, (3) …… connection terminal part, (3a) …… barbed connection part,
(3b) …… Soldering part, (4) …… Bobbins, (5) ……
Winding, (6) ... vertical groove.

Claims (1)

[Scope of utility model registration request] 1. A winding part, a pedestal part under the winding part, which is integrated with the winding part and projects to both outsides of the winding part, and a pedestal which is planted on the pedestal part and has one end thereof A winding connection portion of a winding end projecting horizontally from the side surface of the pedestal portion, the other end being parallel to the lower surface of the pedestal portion and positioned in a zigzag relationship with the twist connection portion when viewed from above. A connecting terminal portion that is a soldering portion having a length that does not project to the outside of the pedestal portion, and has a width wider than the width of the soldering portion that vertically penetrates to the soldering portion position of the pedestal portion. A surface-mounted coil for a printed wiring board, which is provided with vertical grooves.