JPH0563023U - Electronic parts - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding electronic components with a transformer installed on the board,
The purpose is to make the height from the substrate as low as possible. [Structure] A loop-shaped transformer is provided on a small board, and terminals of the transformer are connected to electrodes for external connection provided on the periphery of the small board so that the transformer can be surface-mounted with an external board. The loop-shaped transformer is arranged so as to fit inside the opening provided on the small-sized board, and is held so that the bottom surfaces of both are aligned.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electronic component, and more particularly to an electronic component in which a transformer is installed on a board.

[0002]

[Prior Art]

 With the development of advanced technology in recent years, electronic components used in various electronic devices have become capable of incorporating each element such as a resistance element, a capacitive element, and an inductive element in a printed circuit board. However, in order to provide impedance, capacitance, and inductance above a certain level, it is necessary to separately mount a corresponding element on the substrate.

In such a case, particularly in the case of a transformer which requires a relatively large inductance because it is used as a power source for a DC-DC converter or the like, it is technically difficult to form it by printed wiring. Therefore, the transformer T is inserted into the substrate 20 as shown in FIG. 6, and the foot 21 protruding to the opposite side of the substrate 20 is bonded to the substrate 20 by the solder 22.

[0004]

[Problems to be solved by the device]

 As described above, when the transformer is installed on the substrate in the conventional electronic component, the distance h from the substrate to the uppermost point of the transformer becomes large, and it is not possible to cope with the recent miniaturization of electronic components. was there.

Therefore, an object of the present invention is to reduce the height from a base plate as much as possible in an electronic component in which a transformer is installed on a substrate.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the electronic component according to the present invention, a small board is prepared in addition to the board, a loop transformer is provided on the small board, and an external connection is provided around the small board. The terminal of the loop transformer is connected to the work electrode.

Further, in the present invention, the above loop-shaped transformer is arranged so as to be accommodated in the opening portion provided in the small board, and the holding member is provided so that the bottom surface of the transformer and the bottom surface of the small board are aligned with each other. You can also hold it.

Further, in the present invention, a toroidal coil can be used as the loop transformer.

Further, in the present invention, the above electrodes may be three-sided electrodes continuously provided on the upper surface, the side surface, and the bottom surface of the small substrate.

[0010]

[Action]

 The present invention focuses on the fact that the loop-shaped transformer is thinner than an ordinary transformer, and a loop-shaped transformer with such a thin thickness is provided on a small board, and the circumference of this small board is By connecting the terminals of the transformer to the provided electrodes to form electronic components, and mounting such electronic components on the substrate, the height from the substrate to the highest point of the transformer is lowered.

Further, in such a case, an opening portion is provided in the small substrate, a loop-shaped transformer is housed in the opening portion, and a holding material is placed so that the bottom surface of the transformer and the bottom surface of the small substrate coincide with each other. If it is held by, the height from the substrate to the transformer top point can be further reduced.

If a toroidal coil is used as the loop-shaped transformer, leakage magnetic flux is small and the coil can be miniaturized, and an electronic component suitable for high frequencies can be obtained.

Further, the electrodes are three-sided electrodes continuously provided on the upper surface, the side surface, and the bottom surface of the above-mentioned small board, so that the optimum soldering state can be obtained when the small board is surface-mounted on the board. You can get it.

[0014]

【Example】

 FIG. 1 is a plan view of an embodiment of an electronic component according to the present invention, a side view of which is shown in FIG. In this embodiment, 1 is a small board, and a toroidal coil 2 as a loop transformer is installed on the small board 1. The toroidal coil 2 is composed of a toroidal core 2a and a coil 2b. There is. The coil 2b includes a temporary winding and a secondary winding, but the wire diameter of the temporary winding is equal to the wire diameter of the secondary winding, and only the number of turns is different. There is.

In addition, electrodes 3a to 3e (may be collectively referred to as reference numeral 3) are provided around the surface of the small substrate 1, and the terminals 4a to 4e of the toroidal coil 2 are respectively soldered portions 5a. To 5e are connected to the electrodes 3a to 3e. The electrode 3a and the soldered portion 5a are connected by the printed wiring portion 6, and similarly, the electrode 3b is connected by the soldered portion 5e and the printed wiring portion 7.

The electrodes 3a to 3e are provided with semicircular cutouts 9a to 9e, respectively, and the electrodes 8a to 8e forming the side surface of the small substrate 1 are provided inside the cutouts 9a to 9e, respectively. The electrodes 3a to 3e are provided so as to be bonded to each other. As shown in FIG. 2, these electrodes 3a to 3e and 8a to 8e are provided on the bottom surface of the small substrate 1 (see FIGS. In the figure, only 10b and 10e are shown).

As shown in FIG. 3, the electronic component according to the present invention shown in FIGS. 1 and 2 is installed on the external final substrate 11 and the electrodes 3a to 3e, 8a to 8e, And 10a to 10b are arranged so as to be connectable to the wiring portions 12a to 12e printed on the substrate 11, respectively. In other words, the wiring portions 12a to 12e of the board 11 and the electrodes 3a to 3e, 8a to 8e, and 10a to 10b of the small board 1 are made to be aligned with each other.

FIG. 4 shows a state in which the small substrate 1 is arranged on the substrate 11 as shown in FIG. 3, as seen from a side surface. The small substrate 1 is installed on the substrate 11, and the small substrate 1 is further installed. A toroidal coil 2 is installed on top of 1. Then, the electrodes 3, 8 (not shown), and 10 (general term) are joined to the printed wiring section 12 by the soldered portion 13 (general term).

As described above, according to the electronic component of the present invention, the height from the substrate 11 to the uppermost point of the toroidal coil 2 is about 6 mm in the conventional case (see FIG. 6). It can be about 3mm, which is half.

Although the toroidal coil 2 is arranged on the small-sized board 1 in the above-mentioned embodiment, as shown in FIG. 5, the small-sized board 1 is provided with the opening portion 14 for accommodating the toroidal coil 2. If the toroidal coil 2 is housed in 14 and the two are attached by an adhesive tape 15 as a holding material so that the bottom surface of the small substrate 1 and the bottom surface of the toroidal coil 2 are aligned with each other, from the substrate to the uppermost point of the toroidal coil 2. The height of can be made lower.

In the above-mentioned embodiment, the electrodes 3a to 3e of the small substrate 1 are provided with the cutouts 9a to 9e. This is because the electrodes 8a to 8e are formed on the side surfaces of the small substrates in addition to the electrodes 3a to 3e and 10a to 10e.

[0022]

[Effect of the device]

 As described above, according to the electronic component of the present invention, the loop-shaped transformer is provided on the small board, and the terminal of the transformer is connected to the external connection electrode provided on the periphery of the small board. Since it is configured so that it can be surface-mounted with the board, the height from the board to the highest point of the transformer can be greatly reduced.

Further, by arranging the loop-shaped transformer so as to fit in the opening provided in the small-sized board and holding the two so that their bottom surfaces are aligned with each other, the highest point of the transformer can be further lowered.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an electronic component according to the present invention.

FIG. 2 is a side view showing an embodiment of an electronic component according to the present invention.

FIG. 3 is a plan view showing a state in which the electronic component according to the present invention is installed on an external substrate.

FIG. 4 is a diagram showing a state in which an electronic component according to the present invention is installed on a substrate of an external substrate and electrodes and printed wiring are soldered.

FIG. 5 is a side view showing another embodiment of the electronic component according to the present invention.

FIG. 6 is a side view showing a conventional example.

[Explanation of symbols]

1 Small board 2 Loop-shaped transformer (toroidal coil) 3,3a-3e, 8,8a-8e, 10,10a-10
e Electrodes 4a to 4e Terminals 5a to 5e Soldering part 11 External substrate 14 Opening part 15 Holding material (adhesive tape) In the drawings, the same reference numerals indicate the same or the same parts.

Claims (4)

[Scope of utility model registration request] 1. A loop-shaped transformer is provided on a small board,
An electronic component characterized in that terminals of the transformer are connected to electrodes for external connection provided around the small board so as to be surface-mountable with an external board. 2. The loop-shaped transformer is arranged so as to fit within an opening provided in the small board, and is held by a holding material so that the bottom surface of the loop transformer is aligned with the bottom surface of the small board. The electronic component according to claim 1. 3. The electronic component according to claim 1, wherein the loop transformer is a toroidal coil. 4. The electronic component according to claim 1, wherein the electrode is a three-sided electrode continuously provided on the upper surface, the side surface, and the bottom surface of the small substrate.