JPH03133109A - Printed board mounting coil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printed circuit board mounted coil.

[Prior Art] Figures 3 and 4 are perspective views and partial views showing an example of a conventional hybrid integrated circuit disclosed in Japanese Utility Model Application Publication No. 84-18809. The toroidal core (1) wrapped with 2) is glued to the printed circuit board (3) with epoxy resin (5), and the leads (2) are attached to the printed circuit board (3).
It is soldered to the conductor land (4) provided in the.

5 and 6 are a plan view and a cross-sectional view of a printed circuit board mounted coil disclosed in Japanese Patent Application Laid-Open No. 1-101813. A ferrite core (3) is bonded onto the plurality of conductors (2) using an adhesive (5), and a conductor (2) is bonded across the ferrite cores (3) using wire bonding (6).
) are connected.

[Problems to be Solved by the Invention] Conventional board-mounted coils are constructed as described above, and the invention disclosed in Japanese Utility Model Application Publication No. 1809 (1984-1) involves winding a lead around a toroidal core. However, the above invention and Japanese Patent Application Laid-Open No. 1-101613
In all of the inventions disclosed in the above publication, the coil is attached to the substrate with an adhesive, so it is difficult to miniaturize the coil.

Furthermore, when a distorted wave current flows through the coil, vibrations and noise are generated in the core, and these vibrations and noise propagate to the substrate, causing various problems. However, since adhesive is used, it is difficult to securely fix the device with adhesive, and vibration and noise cannot be prevented.

The present invention was made in order to solve the above-mentioned problems, and aims to provide a printed circuit board-mounted coil that can be easily formed into a coil for a transformer or inductor, and can also prevent the generation of vibration and noise. This is the purpose.

[Means for Solving the Problems] A printed circuit board mounted coil according to the present invention has a core mounted on a printed circuit board via an elastic member mixed with ferrite powder, and a plurality of conductive coils provided on the printed circuit board. The pattern is connected to a plurality of leads having a substantially inverted U shape that are fitted from above the core to straddle the core.

[Function] The core is firmly fixed on the printed circuit board by the lead, and a coil is formed by the lead and the conductive pattern.

Furthermore, even if a distorted wave current flows through the coil and causes the core to vibrate or generate noise, this is absorbed by the elastic member and does not propagate to the printed circuit board.

[Embodiment] FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a tI sectional view thereof. In both figures, (10) is a coil constituting a transformer or inductor, (11) is a core made of magnetic material, (12), (12a), (12b), --
(12n) is an inverted U-shaped lead. (13) is an elastic member such as a rubber sheet having elasticity mixed with ferrite powder, and its surface shape is the same as that of the core (11). (15) is a printed circuit board,
At positions corresponding to the surface shape of the core (11) on the back side, there are a number of conductive patterns (18), (16a), (16b), - slightly longer than the width of the core (11) and at predetermined angles.
...(18n) are formed, and through holes (18) are formed at both ends of each of the conductive patterns (16) to (16n) in proximity to the inner and outer edges of the core (11).
is provided. (17) and (17a) are coils (
A through hole (18) is provided at each end of the input-side conductive pattern and the output-side conductive pattern of 10).

Next, an example of mounting a printed circuit board-mounted coil consisting of the above-mentioned parts will be described. First, the elastic member (13) is bonded to the bottom surface of the core (11) with adhesive or the like, and the printed circuit board (
15〉The elastic member (13) is brought into contact with the core (11)
Place. Next, make an inverted U-shaped lead (for example (12a
)) from above the core (11) and straddle it.
) and connect one leg with a conductive pattern (e.g. (16)
), and the other leg is inserted through the other through hole (18) of the adjacent conductive pattern (lea). After inserting the legs of the leads (12) to (12a) into each through hole (18) in this way, solder them (19) to the conductive patterns (1B) to (16n) and (17) and (17a), respectively. For example, the core (11) is firmly fixed to the printed circuit board (15), the leads 12) to (12n) and the conductive patterns (1B) to (18n) are connected in series, and the coil (
10) is constructed.

The input side conductive pattern (17) of the coil (10) configured in this way, the coil (10), and the output side conductive pattern (1
When the circuit formed by 7a) is powered, the coil (10) acts as a transformer or an inductor. Even if a distorted wave current flows through the coil (10), vibrations and noise generated in the core (11) are absorbed by the elastic member (13) and are not transmitted to the printed circuit board (15).

[Effects of the Invention] As is clear from the above description, the present invention provides a method in which an elastic member containing ferrite powder is interposed between the core and the printed circuit board, and a substantially U-shaped lead is fitted from above the core. Since the core is fixed to the printed circuit board by connecting it to the conductive pattern provided on the printed circuit board, and the coil is formed by the leads and the conductive pattern, it is easy to mount and can be firmly attached to the printed circuit board.

Further, vibrations and noise generated in the core at t- due to the distorted wave current are absorbed by the elastic member, and can be prevented from propagating to the printed circuit board.

Furthermore, since ferrite powder is mixed in the elastic member, it has great effects when implemented, such as being able to obtain more inductance with the same number of turns compared to conventional coils.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a 1-I sectional view thereof, FIG. 3 is a perspective view of an example of a conventional hybrid integrated circuit, FIG. 4 is a sectional view thereof, and FIG. 5 is a sectional view thereof. FIG. 6 is a plan view of an example of a conventional printed circuit board mounted coil, and FIG. 6 is a sectional view thereof. In the figure, (10) is a coil, (11) is a core, (1
2) to (12n) are leads, (13) is an elastic member, (1
5) is a printed circuit board, (16) to (L8n) are conductive patterns, and (18) is a through hole. Note that the same reference numerals in the figures include the same or equivalent parts.

Claims (1)

[Claims] A core made of a magnetic material and ferrite powder mixed therein,
an elastic member formed to have approximately the same shape as the surface shape of the core; a plurality of approximately U-shaped leads formed on one side of the printed circuit board to correspond to the surface shape of the core; A core is placed on the other surface of the printed circuit board via the elastic member, and the leads are fitted onto the core to connect the leads and the conductive patterns. A printed circuit board mounted coil made by connecting the