JPH05167375A - Lc noise filter - Google Patents

Abstract

(57) [Summary] [Structure] Insulating films having rectangular tooth-shaped first and second conductors 1 and 2 attached to the front and back surfaces are alternately displaced at the bent portions of the rectangular tooth-shaped portions 1a and 2a. Is an LC noise filter that is formed by being folded into a
1b and 2b are formed integrally with the rectangular teeth 1a and 2a,
This is an LC noise filter in which the connecting terminals 1b and 2b are formed in the longitudinal direction of the conductors 1 and 2. [Effect] Since the connecting terminal portion integrally formed with the rectangular tooth portion of the conductor is provided along the longitudinal direction of the conductor, when the conductor pattern is punched out from one conductor foil, It does not extend beyond the entire width of a certain rectangular tooth-shaped portion, so that the conductor pattern can be obtained without waste, and the cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved LC noise filter.

[0002]

2. Description of the Related Art Recently, a small and inexpensive LC noise filter has been proposed which can surely remove intruding noise without causing ringing.

This noise filter is of a folding type, and as shown in FIG. 6, a rectangular tooth-shaped first conductor 102 is attached to one side of a first insulating sheet 101, and a second tooth
The second conductor 1 having a rectangular tooth shape on one side of the insulating sheet 103 of
04, and both insulating sheets 101, 103
Is further folded and laminated (see FIG. 7) such that the bent portions of the rectangular tooth-shaped portions of both conductors 102 and 104 are displaced alternately (see FIG. 7), thereby forming the LC noise filter (see FIG. 8) 105. Of the first conductor 102 functions as a coil having a predetermined number of turns.
And a capacitance is formed between them and connection terminals 106 and 107 are attached to the ends of the conductors 102 and 104 by welding so as to project from both sides.

By the way, as described above, since the work of welding the connecting terminal to the end portion of the conductor is troublesome, FIG.
As shown in (a) and (b), the conductors 111 and 112 are
The terminal portions 111a and 112a for connection were integrally patterned at the end portions of, and punched from a single conductor foil.

[0005]

However, as shown in FIG. 9, terminal portions 111a, 11a for connection protruding on both sides are formed.
When the conductor pattern having 2a is punched out from a single conductor foil, the distance between the conductor patterns adjacent to each other becomes wide due to the protruding terminal portions 111a and 112a.
There is a problem that the number of conductor patterns that can be produced from one conductor foil is reduced, and the production cost is increased.

Therefore, the present invention can solve the above-mentioned problems.
An object is to provide a C noise filter.

[0007]

In order to solve the above-mentioned problems, the LC noise filter of the present invention has an insulating film having rectangular tooth-shaped conductors adhered to the front and back surfaces, in which the bent portions of the rectangular tooth-shaped portions are An LC noise filter is formed by being folded so as to be alternately displaced, the connecting terminal portion is integrally formed with a rectangular tooth portion, and the connecting terminal portion is formed in a longitudinal direction of a conductor. It is something that follows.

[0008]

According to the above construction, since the connecting terminal portion integrally formed with the conductor is provided along the longitudinal direction of the conductor, when the conductor pattern is punched out from one conductor foil, the main body portion Does not extend beyond the entire width of the rectangular tooth-like portion, and therefore a conductor pattern can be obtained without waste.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the LC noise filter according to the present invention, the rectangular tooth-shaped first and second conductors are attached to both surfaces of the insulating film, and insulating films are formed on the front and back surfaces of the insulating film. A three-terminal type LC noise filter is obtained by folding the bent portions of the curved portions alternately so as to be in a laminated state.
The first conductor functions as a coil having a predetermined number of turns, and the second conductor forms a capacitance with the first conductor.

The gist of the present invention resides in the structure of the terminal portion for connecting the LC noise filter to the outside. That is, as shown in FIGS. 1 (a) and 1 (b), the rectangular tooth portions 1a and 2a are formed at predetermined end portions of the first conductor 1 and the second conductor 2 which are respectively formed in the rectangular tooth shape. The terminal portions 1b and 2b are integrally extended along the longitudinal direction of the conductors 1 and 2 with the same line width.

Here, using these conductors 1 and 2, LC
A general procedure for manufacturing the noise filter will be described.
First, as shown in FIG. 2, first and second conductors (for example, a metal foil is used, specifically, a Cu foil is used) 1 and 2, and an insulating film (for example, a polyimide resin) between them. 3) and the insulating films (insulating resin) 4 are formed on the upper and lower surfaces, leaving the terminal portions 1b and 2b, respectively.

Next, as shown in FIG. 3, after folding the above-mentioned piles so that the bent portions of the rectangular tooth-like portions 1a and 2a are alternately displaced, as shown in FIG. 1
Bend so that b and 2b are in different positions and on the same surface.

Next, as shown in FIG. 5, three U-shaped electrode members (for example, made of Cu) 5 are externally contacted with the corresponding terminal portions 1b and 2b. A surface-mount type LC noise filter can be obtained by fitting and then welding.

As described above, since the connecting terminal portions 1b and 2b integrally formed with the conductor are extended along the longitudinal direction of the conductors 1 and 2, the conductor pattern is formed from one conductor foil. When punching out, the conductor pattern does not protrude beyond the entire width of the rectangular tooth-shaped portion that is the main body portion, so that the conductor pattern can be obtained without waste.

[0015]

As described above, according to the structure of the present invention, since the connecting terminal portion integrally formed on the rectangular tooth portion of the conductor is provided along the longitudinal direction of the conductor, the conductor pattern is formed. When punching out from one sheet of conductor foil, it does not protrude beyond the entire width of the rectangular tooth-shaped portion that is the main body portion, so that the conductor pattern can be obtained without waste and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a conductor forming an LC noise filter according to an embodiment of the present invention.

FIG. 2 is a side view showing a manufacturing procedure of the LC noise filter in the embodiment.

FIG. 3 is a side view showing a manufacturing procedure of the LC noise filter in the embodiment.

FIG. 4 is a side view showing a manufacturing procedure of the LC noise filter in the embodiment.

FIG. 5 is a side view showing the manufacturing procedure of the LC noise filter in the example.

FIG. 6 is an exploded perspective view of a conductor and an insulating sheet that form an LC noise filter in a conventional example.

FIG. 7 is a perspective view showing a manufacturing procedure of an LC noise filter in a conventional example.

FIG. 8 is an external perspective view of an LC noise filter in a conventional example.

FIG. 9 is a plan view of a conductor forming an LC noise filter in another conventional example.

[Explanation of symbols]

 1 1st conductor 1a Rectangular tooth part 1b Terminal part 2 2nd conductor 2a Rectangular tooth part 2b Terminal part 3 Insulating film 4 Insulating film 5 Electrode member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Ikeda 2-5-6-213 Sanno, Ota-ku, Tokyo

Claims (1)

[Claims] 1. An LC noise filter formed by folding an insulating film having rectangular tooth-shaped conductors adhered on the front and back surfaces such that the bent portions of the rectangular tooth portions are alternately displaced.
An LC noise filter, wherein the connecting terminal portion is formed integrally with the rectangular tooth portion, and the connecting terminal portion is formed along the longitudinal direction of the conductor.