CN1086636A

CN1086636A - Band filter and it is applied to the method for electric connector

Info

Publication number: CN1086636A
Application number: CN93119817A
Authority: CN
Inventors: J·F·伊安奈拉; P·J·阿斯纳塔西奥; J·M·恩格里什
Original assignee: Whitaker LLC
Current assignee: Whitaker LLC
Priority date: 1992-11-03
Filing date: 1993-11-02
Publication date: 1994-05-11
Also published as: JPH06208872A; EP0596216A1; BR9304411A; KR100207304B1; EP0596216B1; DE69308473D1; FI934844A; MX9306448A; ATE149748T1; AU4878993A; NZ248616A; HU9303115D0; AU668416B2; KR940012710A; PL172374B1; HUT67651A; HU213964B; DE69308473T2; PL300800A1; FI934844A0

Abstract

An electric connector (10) comprises that at least one signalling contact (22) and a ground structure (16) are contained in the dielectric enclosure (12) with flat outer surface part (19).Can be equipped with filter (32) to each signalling contact, filter is banded, has dielectric material (36) to be stacked between the broad-area electrode (34,38), and its strip is attached on the outer surface of outer cover (14); Dielectric constant that selected dielectric material has and material thickness are to provide desirable electric capacity between signal electrode and the grounding electrode (34,38).

Description

Band filter and it is applied to the method for electric connector

The present invention relates to the electric device such as connector, more particularly, relate to and a kind ofly be contained in the method for connector shell surface portion with the bar band filter of realizing the assembling laminated construction by the bar band filter.

The continuous increase that the high-speed figure pulse is used in communication causes using sensitive device to receive and produce this pulse.This sensitivity makes these devices be easy to be subjected to the interference of the unwanted frequency that transmits on the signal path with the desired signal frequency conversely again.In order to solve the problem that causes thus, many development have formed some patents, are intended to utilize electric connector as carrier, eliminate unwanted frequency with the suitable filter that accommodates appropriate characteristics.United States Patent (USP) 4,695 is drawn one for No. 115 and is had the phone connector of shunt capacitance and illustrated that the capacitor that how to use in this connector of packing into to filter undesirable frequency from the signal that carry the connector signal contact.The filter here is called " foundation stone capacitor (tombstone capacitor) ", and provides this capacitor is connected in means between signal circuit and the earthed circuit.It will be appreciated that this filter has occupied the quite most of volume in the connector cumulative volume.

United States Patent (USP) 4,772,224 have represented a kind of modular capacitor connector, and it has capacitor and the additional ferrite inductor that is used for filtering.Resemble patent 4,695,115 is such, and filter element has occupied the suitable large volume of device.Particularly for an assembly that uses this filter connector, this filter is sizable to the printed circuit board (PCB) of assembly or the height of printed circuit part.

Therefore, a target of the present invention just provides the connector of a band filter, and its filter has increased the assembling yardstick of this interface unit only minimumly.Another purpose provides a kind of multiway electric coupler component that is connected with the strip filter, this strip filter is attached on the outer surface of connector shell in a kind of inconspicuous (unobtrusive) mode, generally follows the shape of outer surface and don't infringement and passes opening on the shell.Another purpose provides a kind of filter construction of making of simply being easy to, and itself can be adapted to connector and other electric devices, as printed circuit board (PCB) and transmission cable.

According to the present invention, the filter combination that is provided is formed by one or more thin foil signal electrodes and by one or more grounding electrodes that the dielectric material shallow layer separates in fact, the area of electrode, the dielectric constant of material and interelectrode distance can selectedly not wished the radio-frequency component of wanting and allow desirable radio-frequency component to pass through signal circuit an electric capacity to be provided, to filter effectively.Do not wish that the radio-frequency component of wanting comes down to by underground with the filtered device importing of being connected of earthing device.This filter can comprise that electrode and dielectric material stack, and perhaps increases a dielectric film again and is used as carrier electrode and dielectric material assembly are remained on its position, so that make and use.

In one embodiment, the present invention has realized above-mentioned target by using an electric connector with plastic casing, and the outer surface of this connector shell has traditional shape basically.This connector comprises the signalling contact that is supported by shell, shell has leg part and earthing contact that extends from outer casing bottom, comprise that a shielding construction is placed on the front surface of connector (or being the field of conjugate action), its leg from connector bottom or installed surface extend downwards, the leg part will be inserted into desire and weld on the circuit unit printed circuit board (PCB) on it in each jack.The signal that is sent to this connector by matching connector is taken on the signalling channel on the circuit bank zoarium by signalling contact, this is by the contact in the jack on the printed circuit board (PCB), its transmission path extends to the reception the assembly and uses on the parts of these signals from connector, to realize the purpose of communication.This combination discloses in the U.S. Patent application of submitting on November 3rd, 1992 (sequence number 07/971,028).

Combine with connector (it can be the shape with the telephone socket of phone attachment plug pairing), porose on filter signal electrode and the grounding electrode, can insert the connector contact that is suitable for using such as the welded contact termination by the hole, its filter strip centers on folding from the plug-in unit outer casing bottom, walk around shell back and top, by welding make grounding electrode and connector shielding and combine.(except the weld) has insulating barrier on the electrode each several part, for example sprays polymer coating in the above or sticks polymer film.

The present invention's expection is applied to the connector of wide range, comprise the connector that has at least one signalling contact and at least one earthing contact according to the size of required capacitor, they have independent strip structure and are used for independent signalling contact, perhaps have a common ground and the electrode that separates to be used for signalling contact separately.The present invention also expects to use in some applications to have common ground electrode and the lamination of the signal electrode that separates as filter capacitor.Banded as previously mentioned and laminated filter is all done quite thinly and deformable among the present invention, from but folding, can be crushed on the flat portions basically on the connector shell outer surface and it is fixed in the above by adhering to or glueing joint, perhaps use a kind ofly to make filter structure in place on shell, thereby connector/filter combination can be treated as components and parts.The filter band can utilize with the signalling contact of connector and the welding of earthing contact it mechanically is fixed on the connector shell, thereby can also select for use a plastic housing to be assembled in further fixed filters band above the connector after welding again.By this technology, reach minimum owing to increase the change in volume that filter causes, and the present invention is adapted to existing connector design, can be added to above the connector with a kind of direct combination technique.

Filter of the present invention can also be used for other electric devices, and as printed circuit board (PCB), there signal electrode and grounding electrode can be soldered directly to the contact of exposing of the signal of printed circuit board (PCB) and grounding path.This filter can also be used for long band shielded signal transmission cable.

Method of the present invention may further comprise the steps: for concrete selected connector provides the strip filter; With being electrically connected of each signal electrode and connector corresponding signal terminal part, this signal terminal stretches out or comes out along case surface at least from connector shell; Thereby it is placed near its outer surface along connector outer surface parcel strip filter; Each grounding electrode is realized being electrically connected with the ground connection shell or the shielding of connector.

Describe the present invention for example referring now to accompanying drawing, map wherein is:

Fig. 1 is an equal proportion stereogram, shows that an electric connector was placed on above the representational band filter before dressing up one with filter of the present invention;

Fig. 2 is that each components and parts among Fig. 1 are in the part assembled state;

Fig. 3 is that the edge-on of filter end that links to each other with connector contact looked and partial cross section figure;

Fig. 4 is the equal proportion stereogram of connector under complete assembled state of Fig. 1 and Fig. 2;

Fig. 5 be filter terminal and with the equal proportion stereogram of connector earthed circuit connecting portion;

Fig. 6 is the connector of Fig. 1 and the side elevation view of filter;

Fig. 7 is the proper side elevation view of connector before finishing assembling;

Fig. 8 is the side elevation view of connector shown in Figure 4; And

Fig. 9 is the plane graph of another embodiment of band filter, demonstrates a pair of signal electrode.

With reference now to Fig. 1,, electric device for example connector combination 10 comprise a connector 12 and a pair of filter 32 and 32 ', demonstrate among the figure the situation before connector and the filter combination.This connector 12 can be taken as the modular telephone socket of a well-known type, and it can be contained on the printed circuit board (PCB) (not shown) on connecting plate or the attaching face 25.Connector 12 receiver module telephone socket (not shown)s are advanced the shrinkage pool on the field of conjugate action 29; This modular jack links to each other with telephone cable, thus this cable and contained signal by connector link circuit board, telephone receiver, facsimile receiver and/computer.The signal that is sent to the received signal circuit by the plug and socket connector may be loaded with does not wish the frequency wanted, and they are that radiation, the induction by the field, leakage and other similar approach of other circuit enter in the cable.These do not wish that the frequency of wanting can cause error just, particularly can make the mistake thus about the numeral 1 of formation digital delivery and the explanation of 0 information.Purpose of the present invention filters undesirable frequency just and allows to constitute frequency that correct signal represents (being voltage level) by connector and enter circuit and receive the equipment of sort signal.

Constituting the connector that resembles connector 12 is that people are familiar, and it comprises a plastic casing 14.Shielding in its surface and ground structure 16, the latter comprises that again the leg 18(that extends out at the bottom of the connector is as shown in Figure 1, 2) be used for linking to each other with circuit on the circuit board.Shell 14 comprises one group of groove 20, and they extend from the top and pass selected to the rear portion ledge.Groove 20 contains one group of

signalling contact

22 and 24 and staggers each other (as shown in Figure 1), and its contact ends at

leg

28,26, and they extend to the below of bottom surface or installed surface 25 jointly with the grounding leg 18 of shielding 16, end at the conductive channel on the

circuit board.Contact

22 and 24 front end (not shown) extend to accepts the plug shrinkage pool on the field of conjugate action 29, with the contact part on the pairing pin connector of accepting to link to each other with signal cable.Shell 14 comprises a resilient fixture 30, and it also extends out from the bottom or the installed surface 25 of connector, and this connector will be inserted into the corresponding jack on the circuit board that uses it.Fig. 6 to Fig. 8 provides the more detailed structure of fixture 30, and it comprises the edge 31 of an inside groove, a band barb, and it was latchable to connector shell 12 on the circuit board before being soldered to

leg

18,26 and 28 on the circuit board.

Shielding construction 16 comprises opposite flank 15 and in the part 17 of end face, shown in Fig. 1,2,4,5, and as Fig. 4, Fig. 5 and shown in Figure 8, folding downwards with respect to the top surface of shell 12.It can also be seen that among each figure that then shell 12 has the outer surface that is made of end face, back, side and bottom surface.The plane surface of relatively flat is represented in end face and side, and the rear surface also comprises plane surface and convexconcave part, as shown in each figure.

According to the present invention, comprised the representative filter that is used for two of 6 signalling contacts here, shown in filter contain two filter elements 32 and 32 '; Be appreciated that whole 6 signal conductors can both be filtered in the manner described.As seeing among Fig. 1, filter element 32 comprises upper electrode 34 and lower electrode 38.Between these two, provide dielectric material basic unit 36 by mode shown in Figure 3.Are fingers 35 of the top electrode 34 of determining that signal connecting element is divided in the forward end of element 32, one hole arranged, this hole is placed on the position of accepting internal wiring pin 28, above this leg is inserted this hole and is welded on by welding angle edge S, as shown in Figure 3 in the place that is designated as 37.The ground connection that at the rear portion is downside electrode 38 refers to 39, and it has determined the ground connection connecting portion, when in the end assembling it is welded on the earth shield structure 16.The signal link positions that

leg

26,28 is determined are separated from each other, and have determined a ground connection link position away from the signal link position and shield 16 top 17.Shown finger 35 is laterally staggered, in other words, with other filter elements 32 is that electricity separates, allow with extend therefrom in the past terminate in element 32 ' electrode 34 ' on leg between gapped thereby do not contact mutually, note referring to 35 ' with hole 37 ' be associated with leg 26.A ground connection of element 32 ' also comprise refers to 39 '.

So each filter element is made up of last lateral electrode 34 of being separated by dielectric material interlayer 36 and downside electrode 38.This element can constitute like this: at first each electric conducting material is laminated on each surface of a dielectric material thin slice, handles the border of determining each electrode by degrading then, can produce a plurality of this strip filters easily in this processing procedure.Be preferably in degrade make electrode after handling to outer surface an insulation cover is arranged, as spraying polymeric coatings or folded, but except the electrode weld with polymeric membrane.For single electrode 34,34 ', each signalling contact that is used to connect leg 28, each signalling contact that is used to connect a leg 26, and have

common ground electrode

38 and 38 '.The selected zone of electrode 34,34 ' have, and thickness with certain dielectric material and coating 36 of certain dielectric constant, the required electric capacity relevant with each signalling contact is provided, in fact each signalling contact is grounded through common ground electrode 38 by capacitance material.Such as everyone knows, electric capacity is the dielectric constant of electrode area, dielectric material and the function of electrode spacing, and electric capacity reduces when anode-cathode distance increases, and dielectric radio when increasing electric capacity increase.

According to one embodiment of present invention, electrode is made of metal forming, and each thickness is about 0.0014 inch magnitude, and its thickness of interlayer is 0.002 inch a magnitude, and the assembly thickness of Gou Chenging is 0.005 inch magnitude like this.A kind of polymeric material membrane, for example by Roho and Hass company, Philadelphia, PA, the PHEOPLEX LC40 polypropylene emulsion of selling has the polypropylene polymeric material as matrix, and wherein the uniformly dispersing barium titanate adds and fills agent (about by weight 50%), about 1 micron of granular size, with this as dielectric material.Conductive layer is half ounce of copper, uses 3 layers of hot pressing lamination machine that itself and dielectric material sheets are combined.

For the lamination of such formation, find when single electrode be that 0.200 inch wide and 1 inch long its electric capacity are between 400 and 480 picofarads.The decay that the electric capacity that obtains like this provides begins being lower than 10 megahertzes slightly, is several decibels insertion loss, rises to 12 to 15 decibels near 100 megahertzes, for 400 picofarad electric capacity, reaches peak value near 250 megahertzes, about 34 decibels.The example of 480 picofarads has the insertion loss that is slightly less than 30 decibels in about 200 to 300 megahertz frequency ranges.Use an amount of barium titanate that withstand voltage greater than 1000 volts further is provided in polymer, this is necessary to some FCC requirement.

Another kind of way is to use a pair of relative anodization aluminium foil, is laminated to and adds on the polymer sheet that fills barium titanate; Perhaps earlier on aluminium foil screen printing or spraying one deck add the polymer that fills barium titanate, and then in the above with another sheet aluminium foil laminate; Then, after the coverage of using suitable geometry, paillon foil is degraded in the mode of routine, produce the similar above-mentioned similar structure of electrode structure of being degraded, after this, can on one or two electrode outer surface, use dielectric coat, as Mavidon company, Palm City, FL, the 350CC epoxy resin of sale.Can downcut the strip filter from dielectric material sheets then.

Filter 32 and 32 ' be layered in (not shown) between them with thin dielectric membrane again, just electrode 38 and electrode 34 ' electric insulation, in style shown in Figure 2, the electrode of each separation is welded on each

contact

22 and 24 in

leg part

26 and 28 separately.Lamination is upwards folding from the bottom of connector shell 14, folding is gone up the back side earlier, stay on flat surfaces there, pass the top in mode shown in Figure 7 then, cross the groove 20 and 18 that Fig. 1 and Fig. 2 see, and on being distributed between two lips 41 of raising of shell 12, being used to prevent that lateral edges is obstructed (snagged) and preventing that filter is shifted, otherwise can oppress the solder terminal node.For filter element 32 and 32 ' shape and size, make by refer to 35,35 ' signal connecting element determined divide interlaced with each other and with each signal link position (leg 26,28) for adjacent; By refer to 39,39 ' grounded part determined is interlaced with each other and adjacent with the top 17 determined earthing positions of shielding 16.

With element 32 and 32 ' end folding downwards with respect to upper surface, then ledge 17 with mode shown in Figure 8 and mode shown in Figure 5 fold into downwards the

finger

39,39 of filter ' the top on.As seen in Figure 5, welding empiecement S " links to each other the finger 39 of electrode 38, thereby links to each other with shielding construction 16 with protuberance 17; And welding empiecement S " will refer to 39 ' be connected to element 32 ' electrode 38 ' link again on this same ground structure.Can be as shown like that two filter elements (for example 32 and 32 ') are folding and end at ground structure with this style.May wish after welding on the filter band die-cast plastic outer cover with the protecting filter band, perhaps replace and adopt traditional approach will cast the plastic jacket of getting well in advance to be fixed on and to cover the filter band on the connector with the protecting filter band.

The present invention considered add ons (for example 32) can independent grounding rather than shown in common ground like that, and refer to that by suitable use (as 39 and 39 ') stop.The present invention also considers can be utilized as the additional element that all the other signal electrodes provide in the place that must reach required electric capacity, thereby given signalling contact is increased the area of electrode (as electrode 34).Also considering by mode shown in the cutaway view among Fig. 8 provides electrode 40 to extend to the shell side, thereby realizes the utilization of additional areas, and Fu Jia area provides the electric capacity of increase for device like this.

The present invention considers and uses 1 signalling contact and 1 earthing contact, perhaps uses 2,4 or 6 contacts.For example, Fig. 9 utilizes a strip structure and the another kind of embodiment that is adapted to the strip filter 80 of filter two contacts.Shown in strip filter 80 have two

signal electrodes

82,84 to be placed on common the same side of dielectric substrate, by space 86 separately.Single common ground electrode 88 is placed in another apparent surface of dielectric substrate.Each

signal electrode

82 and 84 has separately

finger

90,92 to extend through the axis of connector corresponding signal terminal (not shown), when installing to the strip bank of filters on the connector, by refer on 90 and 92

hole

94 and 96 respectively the acknowledge(ment) signal terminal and it is welded on above.Shown in grounding electrode comprise that ground connection refers to that 98 extend to outside the scope of

signal electrode

82 and 84 so that be welded in the earth shield of connector (not shown).

Can utilize different layouts to use the different piece of outer surface of outer cover, as long as have suitable area to obtain specified expectation capacitance.Make people can realize the present invention best to the description that the present invention carried out, claims will determine to have the manufacturing content.Advantage of the present invention provides an electric connector that has the strip filter, another advantage provides the outer surface that this band filter is installed in connector, a filter electrode links to each other with the signalling contact of connector, and another electrode links to each other with shield member on the shell.

Claims

1, an electric connector (10), comprise: dielectric enclosure (14), it has electric contact (22,24) to be fixed therein and comprises that leg (26,28) stretches out from installation surface (25), a shield member (16) is contained on the described shell (14), and a filter element (32,32 ') is electrically connected with at least one described leg (26,28), and its characteristics are:

Described filter element (32) comprises that electrode (34,38) by dielectric material (36) separately, one of described electrode (34) is electrically connected with one of described leg (26,28), described filter element (32) extends along the part of described dielectric enclosure (14), and is electrically connected with described shield member (16).

2, an electric connector described in claim 1, its characteristics are that described filter element (32) comprises that a contact finger (35) is electrically connected with described leg.

3, an electric connector described in claim 1 or 2, its characteristics are that described filter element (32) comprises that a ground connection refers to that (39) are electrically connected with described shield member (16).

4, an electric connector described in claim 1 to 3, its characteristics are that described shield member (16) has a top (17) to bend to described shell (14) and meshes.

5, an electric connector combination described in claim 1 to 4, its characteristics are that described shell (14) has flat surfaces along its back side and top, described filter element (32) extends along described flat surfaces.

6, filter element (32) is applied to the method for an electric appliances spare (12), this electric appliances spare has a dielectric enclosure (14), this shell has first and second surfaces (25,29) and at least one signal contact component (22,24), this contact component has first and second contact portions to be exposed to described first and second surfaces respectively, is used for determining the signal circuit of transmission signals between the respective electrical conductor; Also comprise an earthing device (16), it has at least a part to be exposed to the part of leaving described first surface (25) on the outer surface of outer cover; Described device has a known structure and an outer surface form, and the characteristics of this method are following step:

Each described signalling contact (22 for described device, 24) provide a filter element (32), it has at least one signal electrode (34) to be used to link independent described signal circuit, also have a grounding electrode (38) to link on the earthing device (16), its filter limits between the two and by dielectric material (36) on electric, its characteristic makes does not wish that the signal frequency component of wanting delivers to described earthing device (16) from described signal circuit, described filter is the Boping shape, and enough deformabilities are arranged, thereby can constitute selected shape, and also have a kind of two-dimensional shapes, can select with corresponding to those parts of between described first surface (25), extending on described electric device (12) outer surface and the described expose portion of described earthing device (16);

The described signal electrode (34) that is right after described filter element first is combined with the expose portion (28) of each described signalling contact (22);

Described filter element (32) is pressed in and along the outer surface part of the described shell (14) of described electric device; And

The described grounding electrode (38) that is right after away from the described filter element second portion of described first is combined with the expose portion (17) of described earthing device (16),

Extend above the each several part of filter element described here (32) on described plane surface, thereby guarantee to comprise the geometry of outer surface of the electric device (12) of described signal circuit at least partially, thereby make the volume of filter element/electric device assembly reach minimum, realization is carried out filtering to already present electric device and is not needed it is made amendment.

7, method as claimed in claim 6, its characteristics are that described " combination " step is welding.

8, as the method for claim 6 or 7, its characteristics are that the described expose portion (17) that described grounding electrode (38) is attached to described earthing device bends to described expose portion (17) with described shell identical afterwards.