JP3585247B2 - Ceramic connector and method of brazing conductor pins in this connector - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a ceramic connector used for connection of components requiring airtightness or heat resistance in a vacuum device, a communication device, a computer, various electronic devices, electric appliances, and the like.
[0002]
[Prior art]
2. Description of the Related Art A connector used for various electronic devices and the like includes a connector body as an insulator and a plurality of conductor pins provided on the connector body. One example of a conventional connector body is made of a thermoplastic resin, and the pins are joined to the connector body by pressure welding. Such a resin connector has low airtightness at the joint between the connector body and the conductor pin, and also has poor heat resistance.
[0003]
Therefore, a connector using a ceramic connector body has been proposed. In a conventional ceramic connector, a conductor pin is fixed to a ceramic connector body using a foil or a paste-like brazing material.
[0004]
[Problems to be solved by the invention]
When a foil brazing material is used, since the brazing material must be processed into a washer shape, the material yield of the brazing material is extremely poor. Further, in order to make the brazing material a predetermined thickness, it is necessary to stack a large number of foils. Therefore, it is difficult to set the brazing material and the conductor pins when brazing, and it takes a long time to perform the work.
[0005]
On the other hand, when a paste-like brazing material is used, it is necessary to apply an appropriate amount of the brazing material to a predetermined narrow place by using an injection machine such as a dispenser. However, it is necessary to control the application position and the application amount to be optimal. Is extremely difficult. Further, in order to control the application of the paste brazing material, it is necessary to improve the dispersibility of the brazing material, but it has been difficult to adjust the viscosity of the brazing material.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a ceramic connector capable of accurately and easily supplying a predetermined amount of brazing material to a predetermined location, and a method of brazing conductor pins in the connector.
[0007]
[Means for Solving the Problems]
The connector of the present invention developed to achieve the above object has a connector body made of ceramics and having a through hole formed therein, and a straight shape which is brazed to the connector body while being inserted into the through hole. A flange-less conductor pin, wherein, among the opening portions at both ends of the through hole, an opening portion on the side where brazing is performed is provided with an enlarged diameter portion, and a predetermined diameter of the conductor pin accommodated in the enlarged diameter portion and the conductor pin is provided. The brazing material has a brazing material attached at a position, and the brazing material has a coil shape and the inner diameter of the brazing material before being attached to the conductor pin is slightly smaller than the outer diameter of the conductor pin. It is a coil spring type brazing material elastically attached to a desired position in the longitudinal direction. The spring-shaped brazing material can be elastically stopped at a desired position in the longitudinal direction of the conductor pin before being melted. The brazing material can also position the conductor pins with respect to the connector body.
[0008]
As the brazing material, a coil-shaped brazing material is used, which is previously attached to the conductor pins before brazing. The brazing material is positioned with respect to the conductor pins by using a brazing jig having a predetermined thickness. The enlarged diameter portion of the through hole is formed by counterboring, C-chamfering, or R-chamfering having a diameter larger than the outer diameter of the brazing material.
[0009]
[Action]
The brazing material is previously attached to a predetermined position of the conductor pin, and the conductor pin is set such that the brazing material is positioned at the upper end opening of the through hole. Then, the brazing material is heated to the brazing temperature, and a part of the brazing material is caused to flow below the through-holes by using the own weight of the molten brazing material to perform brazing.
[0010]
Since the brazing material is on the upper end side of the conductor pin, that is, on the upper surface side of the connector body, the brazing material naturally flows toward the lower end according to gravity during brazing, so that the brazing material is uniform in the circumferential direction and the length direction of the conductor pin. The attachment state is obtained.
[0011]
By appropriately selecting the brazing time, the brazing length (the position of the brazing lower end) can be adjusted. For example, when it is necessary to prevent the brazing material from adhering to the lower part of the conductor pin due to the flow of solder below the lower surface of the connector body due to the contact resistance of the conductor pin and the plating treatment of the conductor pin, etc. A brazing time may be selected so that the brazing stops at the lower surface of the connector body.
[0012]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
A ceramic connector 10 shown in FIG. 5 has a connector body 11 made of an alumina ceramic sintered body as an insulator, a plurality of conductor pins 12, and a brazing portion for joining each conductor pin 12 to the connector body 11. 13 are provided. The number and arrangement of the conductor pins 12 are not limited to the illustrated example.
[0013]
When the conductor pin 12 is used for a use in which a thermal cycle is applied, fernico (Fe-Ni-Co-based alloy) is preferable from the relation of a thermal expansion coefficient. Depending on the application, a connector pin material such as a Cu alloy, stainless steel, or an Fe-Ni alloy may be used.
[0014]
As shown in FIG. 1, a through hole 15 through which the conductor pin 12 is inserted is formed in the connector main body 11. The through hole 15 penetrates in the thickness direction of the connector body 11. The through hole 15 includes one opening portion 16 located on the upper side in the drawing, another opening portion 17 located on the lower side in the drawing, and a straight main hole portion 18 located between the opening portions 16 and 17. Have.
[0015]
Among the opening portions 16 and 17 at both ends of the through hole 15, an opening portion 20 on the upper side, which is a side on which brazing is performed, is provided with a diameter-enlarging portion 20. The diameter enlarged portion 20 is formed in a shallow round hole shape by so-called counterboring.
[0016]
Further, the Mo—Mn metallized layer 25 is uniformly formed on the inner surface of the main hole portion 18 and the enlarged diameter portion 20 of the through hole 15, and the Ni plating layer 26 is applied to the entire surface of the metallized layer 25. I have.
[0017]
The conductor pins 12 are brazed to the Ni plating layer 26 by a brazing material 30 using Ag brazing. The brazing is performed from the caliber enlarged portion 20 side. The brazing depth is from the opening end of the enlarged diameter portion 20 to the middle portion in the longitudinal direction of the main hole portion 18, that is, the position before the lower end side opening portion 17 or the position of the lower end side opening portion 17.
[0018]
In a state before brazing is performed (a state before heating), the brazing material 30 of the present embodiment has a coil shape in which a wire-shaped Ag braze is wound a plurality of times. The brazing material 30 has an inner diameter equal to or slightly smaller than the outer diameter of the conductor pin 12 so that the brazing material 30 is wound around the conductor pin 12 so as to be tightly wound around the conductor pin 12 at a predetermined position in the longitudinal direction. Fixed to.
[0019]
In the case where a straight pin having no convex part in the longitudinal direction is used as an example of the conductor pin 12, a means for attaching the brazing material 30 to a predetermined position of the conductor pin 12 is shown in FIG. It is preferable to use such a brazing jig 35. The brazing jig 35 is provided with a conductor insertion portion 36 penetrating in the thickness direction, and the conductor pin 12 can be passed through the insertion portion 36.
[0020]
The thickness T1 of the brazing jig 35 is selected according to the mounting height L of the brazing material 30. That is, the sum of the thickness T1 of the brazing jig 35 and the thickness T2 of the connector body 11 corresponds to the height L from the tip 12a of the conductor pin 12 to the brazing position. In this case, the mounting position of the brazing material 30 can be adjusted by appropriately selecting the thickness T1 of the brazing jig 35.
[0021]
The brazing jig 35 is placed on the base 40, and the connector main body 11 is put on the brazing jig 35. Then, the conductor pins 12 are passed through the through-holes 15 and the through-holes 36, and the brazing material 30 enters the enlarged diameter portion 20. Thus, the brazing material 30 is set at a predetermined position in the longitudinal direction of the conductor pin 12.
[0022]
When the brazing of the conductor pin 12 is performed, the brazing material 30 is previously attached to a predetermined position of the conductor pin 12 as described above, and the brazing material 30 is placed in the enlarged diameter portion 20 of the through hole 15. Heat to the specified brazing temperature. As a result, a part of the molten brazing material 30 flows downward inside the through hole 15 by its own weight, and is cooled and hardened, thereby completing the brazing as shown in FIG.
[0023]
As described above, in the present embodiment, the coil-shaped brazing material 30 fixed to the conductor pins 12 is employed, so that the setting operation of the brazing material 30 can be simplified, and the number of steps required for brazing can be reduced. Can be achieved.
[0024]
In addition, by adjusting the wire diameter and length of the brazing material 30, the quantification of the brazing becomes easy, and even when the diameter of the conductor pin 12, the inner diameter of the through hole 15, or the brazing length changes. Is possible. Since the brazing material 30 is handled while being fixed to the conductor pins 12, the brazing material 30 does not fall off or is lost before brazing, and handling is easy.
[0025]
In addition, the upper end opening portion 16 of the through hole 15 is provided with the enlarged diameter portion 20 by counterbore processing having an inner diameter larger than the outer diameter of the conductor pin 12. Can be prevented from spreading too far. Therefore, in a case where the number of the conductor pins 12 is large and the pin interval between the conductor pins 12 is narrow, it is effective in preventing the brazing material 30 from contacting between the conductor pins 12 and 12 to be in a conductive state. It is.
[0026]
As a means for positioning the brazing material 30, as shown in FIG. 6 (a), a flange-shaped convex portion 45 is provided at an intermediate position in the longitudinal direction of the conductor pin 12, and from below the convex portion 45. The brazing material 30 may be inserted up to the position of the projection 45. Alternatively, as shown in FIG. 6B, the brazing material 30 may be positioned by inserting the brazing material 30 from above the flange-shaped convex portion 45.
[0027]
Further, as shown in FIG. 7A, a cylindrical brazing material 50 may be used, or as shown in FIG. 7B, an axial slit 52 may be formed in a cylindrical brazing material 51. May be employed. Each of the brazing materials 50 and 51 can be fixed to the conductor pin 12 by setting the inner diameter to be equal to or slightly smaller than the outer diameter of the conductor pin 12. The conductor pin 12 provided with the cylindrical brazing material 50 shown in FIG. 7A is an integral body formed by casting a brazing material in a cylindrical shape around a predetermined position of the conductor pin 12. Is also good.
[0028]
In addition, by adjusting the inner diameter, outer diameter, or thickness of the brazing materials 50 and 51, quantification of the brazing material is facilitated, and the diameter of the conductor pin 12, the diameter of the through hole 15, the length of the brazing portion, and the like are reduced. We can cope even if we change.
[0029]
FIG. 8 shows another embodiment of the present invention, in which a cylindrical brazing material 55 made of Ag brazing is attached to a predetermined position of a conductor pin 12 made of fernico as in the above embodiment. The connector body 11 is made of alumina ceramics.
[0030]
The upper end opening portion 16 of the through hole 15 is chamfered to a diameter equal to or larger than the outer diameter of the brazing material 55, thereby providing an enlarged diameter portion 56. Further, a W metallized layer 60 is formed on the inner surface of the main hole portion 18 and the enlarged diameter portion 56 of the through hole 15, and a Ni plating layer 61 is provided on the surface thereof. The conductor pins 12 to which the brazing material 55 is attached are set on the alumina connector body 11. A part of the brazing material 55 melted by the heating flows downward inside the through hole 15 and is hardened, so that brazing is performed.
[0031]
In still another embodiment shown in FIG. 9, a pipe-shaped brazing material 65 made of Ag brazing containing an active metal such as Ti is attached to a predetermined position of a conductor pin 12 made of Fernico. Aluminum nitride is used for the connector body 11 as an example of an insulator. In the upper end opening portion 16 on the brazing side of the through hole 15, an R-chamfer larger than the outer diameter of the brazing material 65 is formed to form an enlarged-diameter portion 65. The convex shape of the R chamfer may be a shape concaved in the opposite direction, that is, a concave shape, as shown by a two-dot chain line P in FIG.
[0032]
The conductor pins 12 to which the brazing material 65 is attached are set on the connector main body 11 and heated to flow a part of the molten brazing material 65 downward to perform brazing. In this case, since the conductor pins 12 are directly brazed to the through holes 15 by the Ag braze containing the active metal, the metallization layers 25 and 60 and the Ni plating layers 26 and 61 as described in the above embodiment are omitted.
[0033]
By providing the enlarged diameter portions 56 and 66 by the C chamfering or the R chamfering as described above, it is possible to prevent the brazing material melted at the time of brazing from being excessively spread on the upper surface of the connector main body 11.
[0034]
【The invention's effect】
According to the present invention, when brazing a straight flangeless conductor pin to the connector main body, a coil-shaped brazing material having an inner diameter smaller than the outer diameter of the conductor pin before attaching to the conductor pin is used. Since the spring-shaped brazing material can be elastically attached to a desired position by its own elasticity, even a thin conductor pin having a pin diameter of only several mm or less (in some cases, 1 mm or less) can be used. In addition, the work of setting the brazing material at a predetermined position can be simplified, workability can be significantly improved, and work time can be reduced. In the present invention, since a straight flangeless conductor pin is used, it is not necessary to form a flange by a forming process such as cold forging, and a brazing material can be attached to an arbitrary position in the longitudinal direction of the pin. The position of the conductor pin with respect to the connector body can be determined by using a material. Further, the yield of the brazing material is remarkably improved as compared with the case where a conventional foil or paste-like brazing material is used. Since the brazing material in the present invention is attached only to the upper surface side of the connector body, the number of brazing materials may be the same as the number of the conductor pins. And since the above-mentioned brazing material is on the upper end side of the conductor pin, that is, on the upper surface side of the connector body, the brazing material heated and melted at the time of brazing naturally flows toward the lower end according to gravity. A uniform brazing condition in the direction is obtained.
Coiled spring brazing material is different from ring-shaped or washer-shaped brazing material, and even if the pin diameter of the connector is as small as 1 mm or less, continuous length brazing material can be easily manufactured by coiling. The brazing material can be cut into a predetermined length. Further, the coil spring type brazing material can be melted in a spiral shape in the circumferential direction of the connector pin sequentially from the lower end portion of the brazing material during the brazing and flow into the through hole. ) And the like, and the airtightness of the through hole portion is excellent.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a state of a part of a connector according to an embodiment of the present invention before brazing.
FIG. 2 is a perspective view of a conductor pin and a brazing material used in the connector shown in FIG. 1;
1. FIG. 3 is a perspective view of a part of the connector shown in FIG. 1 before brazing.
FIG. 4 is a sectional view showing a jig used for brazing the connector shown in FIG. 1;
FIG. 5 is a perspective view showing an example of a brazed connector.
FIG. 6 is a perspective view showing a modified example of two types of conductor pins having convex portions of different modes.
FIG. 7 is a perspective view of two types of conductor pins showing a modification of the brazing material.
FIG. 8 is a cross-sectional view of a part of a connector according to another embodiment of the present invention.
FIG. 9 is a cross-sectional view of a part of a connector showing still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Ceramic connector, 11 ... Connector main body, 12 ... Conductor pin, 15 ... Through hole, 16 ... Opening part, 20 ... Enlarged diameter part, 30 ... Brazing material, 35 ... Brazing jig, 45 ... Collar-shaped convex part , 50, 51: brazing material, 55: brazing material, 56: enlarged diameter portion, 65: brazing material, 66: enlarged diameter portion.

Claims (4)

A ceramic connector comprising a connector body made of ceramics and having a through-hole formed therein, and a straight flange-shaped conductor pin brazed to the connector body while being inserted into the through-hole,
Among the opening portions at both ends of the through hole, an opening portion on the side where brazing is performed is provided with an enlarged diameter portion, and is accommodated in the enlarged diameter portion and attached to a predetermined position in a longitudinal direction of the flangeless conductor pin. With brazing material,
A coil spring type brazing in which the brazing material is wound in a plurality of coils and the inner diameter of the brazing material before being attached to the conductor pin is slightly smaller than the outer diameter of the conductor pin, and is elastically attached to the conductor pin. A ceramic connector characterized by being a material. The ceramic connector according to claim 1, wherein the enlarged diameter portion is formed by counterboring, C-chamfering, or R-chamfering the outer diameter of the brazing material or more. The brazing material used when brazing the conductor pins to the connector body made of an insulator having a through hole is wound in a plurality of coils, and the inner diameter of the brazing material before being attached to the conductor pins is the outer diameter of the conductor pins. It is a coil spring type brazing material that is slightly smaller than the conductor pin and is elastically attached to the conductor pin, and the conductor pin is a straight flangeless conductor pin,
The coil spring-shaped brazing material is previously attached to a predetermined position of the flangeless conductor pin by its elasticity, and the brazing material is used to position the conductor pin with respect to the connector body in the longitudinal direction, so that the brazing material can pass through the through-hole. The conductor pin is set in the through hole so as to be positioned at the upper end opening of the hole, and then heated, and a part of the brazing material is flowed below the through hole by utilizing the own weight of the molten brazing material. A method for brazing a conductor pin in a ceramic connector, comprising: 4. The brazing method according to claim 3, wherein a brazing jig having a thickness corresponding to a distance from a tip of the conductor pin to a brazing position is used to attach the brazing material to a predetermined position of the conductor pin.

Images