JPH0544787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a filter connector, and particularly to an improvement for reducing the number of parts.

SUMMARY OF THE INVENTION The present invention comprises a case having a conductive surface divided into a back shell and a front shell;
In a filter connector in which a filter element is housed, the backseal is given the function of holding the filter element and pins, the function of grounding one electrode of the filter element, and the function of the original backsiel. ,
This aims to reduce the number of parts and to further reduce the impedance on the ground side.

BACKGROUND ART Conventionally, filter connectors have been available in various types and designs, and these have been changed depending on the scene in which the filter connector is used.

For example, the filter connector shown in FIG. 10 is attached to the edge of a board (not shown) in an upright position as shown. Therefore, an L-shaped angle 1 is attached to both ends of a metal case 2 by bolts 3 and nuts 4. A through hole 5 provided in the horizontal part of the L-shaped angle 1 is used for attaching this filter connector to a board.

The metal case 2 described above is constructed by combining a front shell 6 and a back shell 7, which are separately prepared. That is, the front shell 6 and the back shell 7 are fixed to each other by the method shown in FIG. 12 or 13. In Figure 12, the hole 16 through which the bolt 3 (Figure 10) passes is shown.
In this case, the front shell 6 and the back shell 7 are fixed by caulking the material on the front shell 6 side, for example. In FIG. 13, for example, the front shell 6 and the back shell 7 are fixed by bending a claw 17 formed on the front shell 6 side toward the back shell 7 side.

Inside such a metal case 2, the 11th
As shown in the figure, a plurality of pins 8 are arranged. One end of the pin 8 constitutes a terminal portion 9, and the other end constitutes an electrical contact portion 10 with a mating connector (not shown). The filter connector just described is a so-called male type in which the electrical contact portion 10 protrudes within the front shell 6, and therefore the front shell 6 has an opening 11.
is formed. The mating connector is of the so-called female type, and its electrical contact portion is inserted through the opening 11 of the front shell 6 and comes into contact with the electrical contact portion 10 of the illustrated filter connector.

Each pin 8 is held by an insulating front insert 12 and a back insert 13 arranged within the metal case 2. In the space between the front insert 12 and the back insert 13, a cylindrical filter element 14 is installed.
It is arranged with each pin 8 passing through it. The filter element 14 is, for example, a cylindrical capacitor, an LC filter, etc., and an electrode on its inner circumferential surface is electrically connected to the pin 8, and an electrode on its outer circumferential surface is electrically connected to the ground plate 15. be done. Soldering is used for these connections. The ground plate 15 is soldered to the back shell 7, thereby making an electrical connection and mechanically fixing it.

Note that, as shown in FIG. 10, the terminal portion 9 of each pin 8 is bent downward. This is so that it can be inserted directly into a hole in a horizontally arranged board and electrically connected. Also,
In FIG. 13, a straight terminal section 9 is shown.

Problems to be Solved by the Invention It can be seen that the conventional example illustrated above requires a relatively large number of parts. That is, if we exclude the pin 8 and the filter element 14, in the example of FIG. A total of 11 parts are required, such as L-shaped angle 1...2, bolt 3...2, and nut 4...2.

Furthermore, since the ground plate 15 is soldered to the back shell 7, the impedance on the ground side may become a problem. Also, Fig. 12 and 1
In any of the examples in Figure 3, the front shell 6
Since the electrical connection between the back shell 7 and the back shell 7 depends only on mutual contact, there is a problem in that contact resistance occurs, and particularly when grounding is made from the front shell 6 side, impedance increases.

Furthermore, soldering the ground plate 15 to the back shell 7 or the filter element 14, and soldering the filter element 14 to the pin 8 involve relatively complicated work.

SUMMARY OF THE INVENTION An object of the present invention is to provide a filter connector that reduces the number of parts, has extremely low impedance, and is easy to assemble.

Means for solving the problem A plurality of pins, one end of which constitutes a terminal part and the other end of which constitutes an electrical contact part with a mating connector,
It is held via an insulating insert in a case that has a conductive surface that is divided into a back shell located on the terminal side and led out to the outside through the terminal part, and a front shell located on the electrical contact side. A plurality of cylindrical filter elements are further disposed within the case and are held with pins passing through them, and electrodes on the inner peripheral surface of the filter elements are electrically connected to the pins. In the filter connector, which is electrically connected to the case so that the electrode on the outer peripheral surface of the filter element is grounded, the insulating insert is sandwiched between the front shell and the back shell. and the insulative insert has a plurality of pin receiving holes open at both ends for respectively receiving electrical contacts of the plurality of pins, the plurality of pins being connected together by the insulative insert. The bag shell is provided with a plurality of through holes through which a plurality of pins pass through, and the filter element is at least partially accommodated in each of the through holes, and the electrodes on the outer circumferential surface of the filter element are located in the respective through holes. The front shell is connected to the peripheral edge of the through hole by solder, and the pin passes through the filter element and is connected to the electrode on the inner peripheral surface of the filter element by solder. The insert has a cover wall that covers each surface, and is fixed to the back shell by being soldered at a portion where the cover wall overlaps with the back shell, and further, the insert is arranged with a space interposed between it and the back shell,
The case is characterized in that a cleaning through-hole communicating with this space is formed closer to the electrical contact portion with the mating connector than the solder connection portions between the back shell, the filter element, and the front shell. be.

Effects of the Invention According to the present invention, the filter element is housed in the through hole of the bag shell, and the electrode on the outer peripheral surface of the filter element is connected to the bag shell by soldering. You can have it. Therefore, the impedance can be made extremely small compared to the case where a separate ground plate is used.

Furthermore, since the pin can be held in the bag shell through the filter element, the bag shell can also function as a conventional bag insert.

For this reason, the number of parts can be reduced by the omission of the ground plate and back insert.

Further, in the present invention, the plurality of pins are integrally positioned by the insulating insert, which facilitates the assembly work of the filter connector. Also,
Since the insulating insert for positioning the plurality of pins in this way is positioned by being held between the front shell and the back shell, misalignment of the plurality of pins can be reliably prevented. Therefore, it is possible to smoothly connect and disconnect the filter connector with the mating connector, and to prevent damage to various parts of the filter connector due to misalignment of the pins.

In addition, since the back shell and the front shell are soldered and fixed to each other, reliable electrical continuity can be obtained between the back shell and the front shell, even when the filter connector is grounded from the front shell side. Even if the front shell and the back shell are connected to each other, impedance is prevented from increasing due to contact resistance between the front shell and the back shell.

Furthermore, since the back shell and front shell are combined to sandwich the insulating insert, the strength is increased and damage to the filter element due to external stress can be prevented.

Also, soldering at various points as mentioned above, i.e., pins, filter elements,
Soldering the back shell and front shell to each other can be accomplished one at a time with a solder dip. This is because the front shell is formed with a cover wall that covers both end faces of the wall where the through hole of the back shell is provided, and if solder is applied to the cover wall, the pins and filter elements can be soldered at the same time. This is because soldering between the and back shell is also achieved. At this time, when cleaning the flux used in soldering, the cleaning liquid can be passed into the case through the cleaning hole provided in the case, so cleaning can be easily performed.

In addition, since the cleaning holes are formed on the electrical contact side with the mating connector from the solder connections between the back shell, filter element, and front shell, each of the back shell, filter element, and front shell Even if a solder dip is applied during solder connection, the cleaning hole will not be filled with solder. Therefore, it is possible to prevent the through holes from being filled with solder, which would interfere with the discharge of the flux sealed within the case.

Embodiment Filter connector 2 which is an embodiment of the present invention
1 is shown in FIGS. 1-5.

The filter connector 21, which has a structure as shown in FIG. 1 when completed, is composed of parts as shown in FIG. 5. That is, the metal case 22
is divided into a front shell 23 and a back shell 24. And inside the metal case 22,
An insulating insert 26 made of resin or the like, a pin 27 formed by punching out a thin metal plate, and a filter element 28 such as a cylindrical capacitor.
is inserted. The insert 26 is held between the front shell 23 and the back shell 24. Although only one pin 27 and one filter element 28 are shown in FIG. 5, the filter connector 21 of this embodiment
each comprises 25 pins 27 and filter elements 28.

The front shell 23 is integrally formed from a thin metal plate by press molding. A cylindrical portion 30 is formed on one side of the flange plate 29, which has a relatively wide surface. The end surface of the cylindrical portion 30 has the opening 3
1. On the other side of the flange plate 29, there are four locking pieces 32 and two cover walls 33.
is formed. Two cleaning holes 34 are provided in each of these cover walls 33. Also,
At both ends of the flange plate 29,
A locking hole 35 is provided.

The insert 26 includes a projection 36 that is received within the cylindrical portion 30 of the front shell 23 and an overhang 37 that then engages the flange plate 29. The above-mentioned cleaning hole 34 is provided in the overhang 37.
A cutout step portion 37a is formed corresponding to the position. A plurality of pin receiving holes 38 are arranged in two rows and penetrate through from the projecting part 37 to the projecting part 36. These pin receiving holes 38 are open at both ends.

One end of the pin 27 constitutes a terminal portion 39, and the other end constitutes an electrical contact portion 40 with a mating connector. Since the filter connector 21 described now is a so-called female connector, the electrical contact portion 40 has a bifurcated fork shape in order to receive the electrical contact portion of the mating male connector. be done. This fork-shaped electrical contact portion 40 is inserted into the pin receiving hole 38 as shown in FIG. In this manner, when the pin 27 is inserted into the pin receiving hole 38, the pin 27 is prevented from easily falling off from the insert 26.

Filter element 28 may be a cylindrical capacitor as described above, or may be an LC filter. The filter element 28 has a cylindrical shape as a whole, and a flange 41 is formed at one end thereof. Electrodes are formed on the inner circumferential surface and the outer circumferential surface of the filter element 28, respectively. The terminal portion 39 of the pin 27 described above passes through the inside of this filter element 28.

The backshell 24 is die-cast from a metal such as a zinc alloy or an aluminum alloy. Therefore, it is relatively thick. Lock holes 43 corresponding to the lock holes 35 of the front shell 23 are provided at both ends 42 of the back shell 24. This lock hole 43
is preferably a screw hole. The end portion 42 further includes a bracket portion 44 extending vertically.
is formed. This bracket portion 44 is provided with a through hole 45 that is used when attaching the filter connector 21 to a suitable board. In addition, the end portion 42
A notch 46 is formed in which the locking piece 32 of the front shell 23 fits. Note that the notch 46 and the locking piece 32 do not need to be particularly provided.

A connecting wall 47 is formed to connect both ends 42 of the bag shell 24. This connecting wall 47
On both sides, rising walls 48 are formed extending from the end portion 42 so that a gap 49 is formed between the bracket portion 44 and the connecting wall 47.

A step portion 50 for positioning the cover wall 33 of the front shell 23 described above is formed on the upper end surface and the lower end surface of the connecting wall 47.

The connecting wall 47 also has the aforementioned pin receiving hole 38.
A plurality of circular through holes 51 are provided corresponding to the positions of. The sizes of these through holes 51 are selected so that they can receive the filter element 28 described above. More preferably, the through hole 5
When the filter element 28 is inserted into 1,
The flange 41 of the filter element 28 comes into contact with the peripheral edge of the through hole 51, and the filter element 2
8 is positioned.

The front shell 23, back shell 24, insert 26, multiple pins 27, and multiple filter elements 28 described above are assembled as shown in FIGS. 1 to 4, and solder is used to interconnect each component. Attachment is carried out. After that, pin 27, which was prepared in a straight state,
The terminal portion 39 is bent at a right angle at an appropriate location.

For example, with reference to FIG. 2, the soldering process will be described. Soldering is performed using solder dips. In this embodiment, one solder dip achieves soldering at all desired locations. In this case, the second
Preferably, a container-shaped mask 52 is used to receive the bracket portion 44, as shown in phantom. The mask 52 is attached to the bracket portion 44 described above.
and the connecting wall 47, and in FIG.
It is arranged so that it reaches a position above the lower edge of No. 3. The mask 52 is used to prevent the through hole 45 of the bracket part 44 from being filled with solder, and therefore, when solder is dipped, the filter connector is heated to an extent that the solder does not flow into the mask 52. 21 can be submerged in solder. Therefore, the second
When it is submerged in the solder bath while maintaining the vertical relationship shown in the figure, the lower edge of the cover wall 33 reaches the solder liquid level, and the front shell 23 and back shell 24 are now soldered. Ru.
Of course, the soldering between the electrodes on the inner peripheral surface of the filter element 28 and the pins 27 and the soldering between the electrodes on the outer peripheral surface of the filter element 28 and the bag shell 24 are also accomplished at the same time.

When the above-described soldering is completed, flux may remain inside the case 22 and near the filter element 28. In order to clean this, the cleaning through hole 34 described above is advantageously used. As shown in FIG. 4, the cleaning holes 34 communicate with the space 53 between the bag shell 24 and the insert 26 via the cutout step 37a, and a liquid such as trichlorethylene is passed through the cleaning holes 34. The flux can be easily removed by running a suitable cleaning solution.

Filter connector 2 obtained as above
1, each filter element 28 has its outwardly facing end surface connected to the connecting wall 4 of the back shell 24.
Preferably, it is substantially flush with the outer surface of 7. This is because if the outward facing end surface of the filter element 28 is deeper than the outer surface of the connecting wall 47,
When forming a recess, during solder dip,
This is because there is a possibility that the solder will be filled in this recess and the pin 27 and back shell 24 will be short-circuited. On the other hand, if the outward facing end surface of the filter element 28 is located protruding from the outer surface of the connecting wall 47, when the pin 27 is bent by a force applied to the pin 27 from the outside, the filter element 28 may be damaged. This is because there is a risk of

FIG. 6 shows the filter connector 2 described above.
1 is connected to a mating connector 54 in a perspective view.

Since the filter connector 21 is of the female type as described above, the mating connector 54 is configured as a male type. The mating connector 54 has a cylindrical part 55 in which the cylindrical part 30 of the filter connector 21 is received, and inside the cylindrical part 55 a protruding electrical contact part 56 of a pin is provided. This electrical contact portion 56 enters into the pin receiving hole 38 from the opening 31 shown in FIG. 2, for example, and is sandwiched between the fork-shaped electrical contact portions 40. The pin with such an electrical contact 56 is held by an insulating insert 57.

Furthermore, end portions 5 are provided on both sides of the mating connector 54 in a symmetrical positional relationship with the filter connector 21.
8 is formed. Additionally, a locking hole 60 is formed in the end portion 58 .

Note that the locking hole 43 on the filter connector 21 side described above was a screw hole, but this connector 5
The locking hole 60 on the fourth side may be a normal hole.

As described above, the lock screw 62 is used to secure the state in which the cylindrical portion 55 of the mating connector 54 is placed over the cylindrical portion 30 of the filter connector 21 and electrical connection is established. In this embodiment, the lock screw 62 includes a hexagonal prism head 63 and a male-threaded shaft 64, and a female thread 65 is further formed at the tip of the head 63. This lock screw 62 first has its shaft portion 64 connected to the lock hole 4 which is a screw hole as described above.
3 is screwed together. Then, the connector 5 on the other side
4 are aligned, the female threaded portion 65 and the locking hole 60 align, and the set screw 66 is passed through and screwed into the female threaded portion 65. In this way, the two connectors 21 and 54 are mechanically fixed to each other.

Note that instead of using the lock screw 62 of a special shape as described above, a normal screw can be used.
From the position of the set screw 66, insert it into the locking hole 60.
Alternatively, the locking hole 43 may be screwed into the locking hole 43 after passing through the locking hole 43.

In FIG. 6, a male type connector 54 is shown as the mating connector 54. This male connector 54 also
It can be realized with substantially the same configuration as the female filter connector 21. That is, the present invention can be applied to both female and male filter connectors by simply changing the shape of the electrical contact portion of the pin and the insert. The connector 54 shown in FIG.
The one indicated by ``68'' is the front shell, and the one indicated by ``68'' is the back shell. The combination of the front shell 67 and back shell 68 and the positional relationship of the filter element and pins with respect to the back shell 68 are determined by the filter connector 2.
It is substantially the same as 1. Further, a cleaning through hole 69 is formed in the connector 54 as well.

FIG. 7 shows a filter connector 21a as another embodiment of the invention. This filter connector 21a differs from the filter connector 21 shown in FIG. 1 only in the following points.

That is, in the filter connector 21 of FIG. 1, a female thread is cut directly into the locking hole 43 to make it a screw hole so that the locking screw 62 can be attached without using a nut. In the filter connector 21a, when forming the back shell 24, a commercially available nut 70 is used.
It is insert molded. According to this embodiment, the effort of cutting a screw into the locking hole 43 can be saved.

Since the other configurations are substantially the same as those shown in FIG. 1, corresponding parts are given the same reference numerals and their explanation will be omitted.

FIG. 8 shows a plan view of a filter connector 21b which is still another embodiment of the present invention. In this embodiment, the lock screw 62a is
It is characterized by being formed integrally with the back shell 24. A female threaded portion 65a is formed at the tip of this lock screw 62a. In this embodiment, the front shell 23 includes a lock screw 6.
A relatively large through hole or notch (not shown) is provided to receive the front shell 23 so as not to interfere with the mating of the front shell 23 with the back shell 24. Note that the lock screw 62a does not need to be tightened or loosened by turning itself, so it does not have to be a hexagonal column, but may be a circular column or a square column.

The other configuration of the filter connector 21b shown in FIG. 8 is the filter connector 21b shown in FIG.
1, corresponding parts are given the same reference numerals and redundant explanation will be omitted.

FIG. 9 shows a filter connector 21c which is still another embodiment of the invention. A feature of this embodiment is that the terminal portion 39 of the pin 27 remains linearly extended, as is clear from a comparison with FIG. That is, this filter connector 21
c is used in a manner different from that of the filter connector 21 shown in FIG. 1 in terms of how it is attached to the board. Therefore, the filter connector 2 in FIG.
1 is not formed.

Thus, for other embodiments of the invention,
Although described with reference to the drawings, other embodiments are possible although not shown.

For example, the bag shell 24 may be made of plastic and have its surface plated with metal. In particular, with this configuration,
The embodiment shown in FIG. 7 or 8 can be more easily achieved by plastic molding.

Further, the bag shell 24 may be formed by cutting metal.

Further, the number of cleaning holes 34 is arbitrary, and the positions thereof are formed closer to the electrical contact portion with the mating connector than the solder connection portions between the back shell, the filter element, and the front shell. As long as it is voluntary. In short, it is sufficient that at least one is provided so as to communicate with the space between the insert and the bag shell. Further, the shape of the cleaning hole is also arbitrary.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a filter connector 21 according to an embodiment of the present invention. FIG. 2 is a plan view of the filter connector of FIG. 1, with a portion broken away to show a cross section. FIG. 3 is a side view of the filter connector 21 of FIG. 1. Figure 4 shows
2 is a cross-sectional view of filter connector 21 of FIG. 1, showing a cross-section through cleaning hole 34 and one pin 27; FIG. FIG. 5 is an exploded perspective view showing the components constituting the filter connector 21 of FIG. 1. FIG. 6 is a perspective view showing the positional relationship for achieving connection between the filter connector 21 of FIG. 1 and the mating connector 54. FIG. 7 is a perspective view showing a filter connector 21a according to another embodiment of the invention. FIG. 8 shows a filter connector 2 according to still another embodiment of the present invention.
It is a top view of 1b. FIG. 9 is a perspective view of a filter connector 21c according to still another embodiment of the invention. FIG. 10 is a perspective view of a conventional filter connector. FIG. 11 shows the filter connector of FIG. 10 in a cross section through pin 8. FIGS. 12 and 13 show conventional methods of fixing the front shell 6 and back shell 7, respectively. In the figure, 21, 21a, 21b, 21c are filter connectors, 22 is a metal case, 23 is a front shell, 24 is a back shell, 26 is an insert, 27 is a pin, 28 is a filter element, 34 is a cleaning hole, 39 40 is a terminal portion, 40 is an electrical contact portion, 51 is a through hole, 53 is a space, and 54 is a mating connector.

Claims (1)

[Scope of Claims] 1. A plurality of pins, one end of which constitutes a terminal portion and the other end of which constitutes an electrical contact portion with a mating connector, are located on the terminal portion side and penetrate through the terminal portion to connect to the outside. The pin is held via an insulating insert in a case having a conductive surface that is divided into a back shell leading out to the front shell and a front shell located on the electrical contact side. A plurality of cylindrical filter elements are arranged to be held in a penetrating state, an electrode on the inner peripheral surface of the filter element is electrically connected to the pin, and an electrode on the outer peripheral surface of the filter element is connected to the ground. a filter connector electrically connected to the case for connection, the insulating insert being sandwiched and positioned by the front shell and the back shell, and the insulating insert being electrically connected to the case; a plurality of pin receiving holes open at both ends for respectively receiving the electrical contact portions of a plurality of pins, the plurality of pins being integrally positioned by the insulating insert; , a plurality of through holes are provided through which the plurality of pins pass through, and at least a portion of the filter element is accommodated in each of the through holes, and an electrode on an outer circumferential surface of the filter element is arranged at a periphery of each of the through holes. and the pin passes through the filter element and is soldered to an electrode on the inner circumferential surface of the filter element, and the front shell is connected to both ends of the wall of the back shell in which the through hole is provided. The insert has a cover wall that covers each surface, and the cover wall is fixed to the back shell by being soldered at a portion overlapping with the back shell, and further, the insert has a space interposed between it and the back shell. The case has a cleaning through hole communicating with the space located closer to the electrical contact portion with the mating connector than the solder connection portions between the back shell, the filter element, and the front shell. A filter connector characterized by being formed. 2. The bag shell is integrally formed with a bracket portion for attaching the filter connector to a suitable board, and the bracket portion extends perpendicularly to a wall surface of the bag shell in which the through hole is provided. Filter connector as described in Range 1.