JP2000340303A - Metal housing, coaxial connector and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal housing which prevents deformation of a fine processing part that is easily generated in a metallic powder injection molding goods and a coaxial connector capable of facilitating assembly while using it. SOLUTION: A metal housing 10 in which a screw 12 and a flange 14 of a coupling means provided in an orthogonal direction and a hollow hole 20 formed therebetween and flat surfaces 16, 18 that are formed at opposite side of the coupling means are integrally molded with metallic powder. A coaxial connector which uses the metal housing 10 as an outer conductor and a manufacturing method thereof is composed of two coupling means which are in an orthogonally crossed L-shaped direction; an outer conductor of the metal housing 10 in which a hollow hole 20 which passes through between the two coupling means and a flat surface at an opposite direction of one of the coupling means are integratedly formed; and an inner conductor of a coaxial conductor core material 54 that is arranged along a center of the hollow hole 20 and that is supported and fixed by an insulation bushings 50, 52 interposed at a corresponding position of the coupling means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure for metal powder injection molding, a method for manufacturing the same, and a coaxial connector using the same and a method for manufacturing the same.
The present invention relates to a coaxial connector in which a complicated three-dimensional metal housing is integrally formed by a metal powder injection molding method and is used as an external conductor, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A coaxial connector having a so-called L-shaped terminal, in which input and output terminals are provided in a direction bent at a right angle for interconnection of coaxial lines for transmitting millimeter-wave or microwave signals and devices, is known. . For example, in a connector having a nominal impedance characteristic of 50Ω, an outer conductor and an inner conductor are determined based on design criteria so as to reduce signal loss in a used frequency band, and emphasis is placed on the attenuation characteristics. A coaxial connector as a connecting component has been manufactured in an effort to accurately reproduce dimensions on design values. FIG. 8 shows a conventional coaxial connector, in which a coaxial line 2 of an internal conductor is fixed in a space of a metal housing 1 of an external conductor via insulating materials 3 and 4, and an input terminal 5 with a screw and an output terminal 6 with a flange. Can be coupled in directions orthogonal to each other. Metal housing 1
Is welded 7 at a right angle to two metal pipes,
The two coaxial lines 2 of the inner conductor are made of insulating material 3 at each terminal,
4 and is connected by a solder 8 at the tip. The coaxial line 2 is disposed substantially along the center in the hollow space of the metal housing 1 including the connection portion of the solder 8. In this case, since a hole for solder connection is made in one of the pipe members, the metal cap 9 is formed after the soldering operation.
Blocked by. Here, the metal housing corresponds to the aforementioned 2
Instead of welding the intersection of two metal pipes, there is also a method in which curved half-pipe materials are welded facing each other, but in any case, the positional relationship between the inner surface of the housing and the coaxial line is the nominal impedance. The design dimensions are determined so that
It is commercialized as a coaxial connector such as a band SAM type.

On the other hand, metal powder injection molding (MIM) is known as a method of manufacturing a small-weight metal product having a three-dimensional complicated shape as an alternative to a mold, forging, or mechanical precision machining. It is spreading as suitable for mass production. This method is a fusion of metallurgy technology for sintered alloys and injection molding technology for synthetic resins. Kneading a binder containing resin and wax into ultrafine, spherical metal powder with a particle size of 1 to 30 μm. As a plastic material, it is injected into a mold and molded, and is subjected to a degreasing step of removing a binder from a molded green body and a sintering step of baking and solidifying metal powder of the green body. The production of products with complex shapes by this method is expected to expand in the field of application in the future depending on the development of the shapes and appropriate manufacturing conditions.

[0004]

Heretofore, the production of a coaxial connector has involved operations such as assembling a metal housing by welding a plurality of parts or soldering coaxial lines in the space. At the same time, the positional relationship of the coaxial line for the inner conductor with respect to the inner surface of the housing of the outer conductor is likely to be uneven, thereby causing undesirable signal reflection between the two conductors,
There are drawbacks such as a large change in the reflection coefficient, an increase in reflection loss especially in the high frequency band region, and a bad influence on the characteristic impedance. Usually, the characteristic impedance of a coaxial line as a feed line is determined by the relative permittivity of the medium and the radius of the inner and outer conductors, and the attenuation constant is obtained by the sum of resistance loss and dielectric loss. The characteristic impedance refers to the value of the input impedance when the termination is non-reflectively terminated on a line that is uniform in the length direction. In such a uniform line, both the average impedance and the end impedance are equal to the characteristic impedance. . However, in an uneven line, the input impedance at the beginning is affected by the reflection coefficient due to the internal unevenness, and is combined with the impedance due to the internal reflection and the reflected wave from the terminal. Deteriorate frequency characteristics. For example, the measurement result of the VSWR, which relatively indicates the degree of reflection, shows deterioration in the high frequency range as shown by the dotted line in the frequency characteristic diagram of FIG.

In addition, the conventional coaxial connector production requires a large number of man-hours and a skilled operator for welding the housing and soldering the coaxial line in a narrow space, thus increasing the product cost. In particular, the housing for the outer conductor is required to maintain a predetermined dimensional relationship with the line for the inner conductor in order to reduce the transmission loss. In addition, welding work of pipe materials and half pieces as outer conductors, soldering work of line intersections as inner conductors, and mounting work of opening closing caps were required. On the other hand, SMA type and SSMA type coaxial connectors used in the GHz band are required to have high precision in the layout design dimensions of the housing and the line in accordance with the demand for miniaturization. In order to overcome such constraints on design and assembly, there is a demand for simplification of assembly work and stabilization of product characteristics, in addition to improvement in accuracy of component parts and mass production.

On the other hand, in the production of metal parts having a complicated shape by metal powder molding called metal injection molding (MIM), softening deformation of a green body is liable to occur due to high temperature and high pressure treatment in a degreasing or sintering step, and sintering is performed. Later, problems such as a decrease in the accuracy of component dimensions and defective deformation were caused, and measures were required for them. In particular, in the case of a metal part having a coupling screw, deformation occurs in a screw part or a thin part that is difficult to correct, and the thread part becomes distorted, and satisfactory roundness cannot be obtained. Defects in the coupling member are difficult to correct and correct, and products assembled using such components must be discarded as severely defective products with defective coupling functions.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned deficiencies, and an object of the present invention is to provide a new and improved housing structure by metal powder molding, a coaxial connector using the housing, and a method of manufacturing the same. And
In particular, as a component of the coaxial connector, a metal housing of an outer conductor is molded by a metal powder injection molding method by a metal powder injection molding method, and a metal housing having an improved specific structure suitable for mass production with high precision and a high performance using this housing And to provide an improved coaxial connector with high working efficiency and a method of manufacturing the same.

Yet another object of the present invention is to provide an improved processing process for manufacturing a metal housing from a metal powder in which a complicated shape and high precision processing is required. Here, the metallic powder includes a powder containing a considerable amount of a nonmetallic material, and the powder includes a small piece or the like that is processed, obtained, and acts in a similar manner to the powder.

[0009]

According to the present invention, a hollow hole having an upright portion and a curved portion communicating with each other between a pair of coupling means provided on the front side in the orthogonal L-shape is formed. Disclosed is a metal housing having a flat surface formed on the back side opposite one of the coupling means. Preferably, the one coupling means is a screw or a flange, and the coupling means, the hollow hole and the flat surface are formed. Are integrally formed by metal powder injection molding. Also, a core having a hollow hole shape having an upright portion and a curved portion communicating with each other of the coupling means is provided in a mold having an outline shape of upper and side coupling means and a lower flat surface. Inserting step of positioning the core, injection step of filling the metal powder of the mixture of the metal powder and the binder into the mold in which the core is arranged, molding step of removing the core by vaporization or melting to form a green body, green It consists of a degreasing step of removing the binder from the body, and a sintering step of the degreased green body.The degreasing step and the sintering step place the green body on a tray and lay down the flat surface formed thereunder. A method for manufacturing a metal housing to be heat-treated is provided. In other words, a metal housing having a hollow hole communicating between the first and second coupling means formed on the orthogonal plane by an upright portion and a curved portion, a coaxial having a jack at one end and a plug at the other end. A coaxial connector in which a conductor core material and an insulating bushing member for fixing the coaxial conductor core material along the center of a hollow hole of a metal housing are assembled. The metal housing degreases a metal powder injection molded body. It consists of a sintered monolithic part, with a screw at the outer position corresponding to one upright part of the hollow hole as the first coupling means and corresponding to the other upright part of the hollow hole as the second coupling means. A flange is provided at an outer position to perform a degreasing / sintering process by making at least an outer surface opposite to at least one of the coupling means a flat surface and making this flat surface a stable mounting surface. Aims to deformation and ease of working with the assembly process in the variation is small, to provide a damping characteristics good coaxial connector.

According to another aspect of the present invention, the coupling means of the input / output terminal is formed on an orthogonal surface, and a linear upright portion and a curved portion having a predetermined curvature are provided between the coupling means. A metal housing having a hollow hole communicating therewith, a coaxial conductor core material having a slotted jack at one end and a pin-shaped plug at the other end, and the coaxial conductor core material is placed along the center of the hollow hole of the metal housing. An insulating bushing member fixed in position at a predetermined portion by means of a metal powder injection molding. The metal housing is provided with a coupling hole on the outer surface of the housing corresponding to one of the upright portions together with a hollow hole by metal powder injection molding, and the other upright portion. A mounting flange is provided on the outer surface of the housing corresponding to the above, and the outer surface of the housing corresponding to the opposite side of the one coupling means is flattened and used as a mounting surface. To provide a connector. The metal housing is preferably made of stainless steel, and its surface is plated with silver (Ag) in a thickness of 1 to 5 μm. Here, the lower limit of the plating thickness is set to 1 μm in order to obtain a skin effect as an electrical characteristic, and the upper limit is determined by the restrictions on the coupling function and cost. Furthermore, in the cross section of the hollow hole of the metal housing, for example, in the area, the upright portion is formed larger than the curved portion, the insulating bushing member is positioned and fixed to the upright portion, and the area occupied by the insulating bushing member is minimized It is proposed that the minimum width required to support the core material for the coaxial conductor is reduced while reducing the loss caused by the dielectric constant of the insulator interposed between the inner and outer conductors. Therefore, a predetermined center position in the housing hollow hole is maintained by the mechanical strength of the core material other than the bearing portion in the hollow hole.

On the other hand, the cross section of the hollow hole is preferably circular,
The upright portion is formed with an enlarged diameter portion larger than the diameter of the curved portion, and an insulating bushing member is disposed at the enlarged diameter portion to fix the coaxial conductor core in a predetermined position. As the locking means for fixing the insulating bushing member at a predetermined position, for example, a projection is provided on the inner surface of the hollow hole, and a recess is provided on the outer surface of the insulating bushing member, so that the concave and convex are engaged. Furthermore, using Teflon resin for the insulating bushing member and beryllium copper for the core material for the coaxial conductor, mooring means such as warpage are provided to determine the mounting position of the both, thereby mooring the core material and the insulating bushing member. This discloses a coaxial connector structure which realizes positioning and reliable fixing between the coaxial conductor core material, the insulating bushing and the metal housing.

Further, the signal transmission coaxial line is connected from one coupling means to the other coupling means in the right angle direction, and the upright portions of each coupling means and the curved portions communicating these upright portions are connected. Housing formed by integrally molding a hollow hole having a hollow portion and a flat surface opposite to one coupling means with a metal powder, a core material for a coaxial conductor arranged along the center of the hollow hole, and the core material And an insulating bushing member for fixing the metal powder in a predetermined position, wherein the metal housing is provided with a hollow core in a mold at a predetermined position, and then a metal powder of a mixture comprising a metal powder and a binder is provided. The green body is formed by injection, and the green body is placed on a tray with the flat surface of the green body facing down. The metal housing is used for degreasing the binder and sintering the metal powder. It presents a production method. Here, the core is formed of an acrylic resin, and can be removed by dissolution with a solution that dissolves the acrylic resin.If necessary, the core is formed of a thermoplastic resin portion and a ceramic portion,
Disclosed is a method for manufacturing a metal housing, in which only a thermoplastic resin portion, which is a part of a core, is removed by heating or melting, and the following degreasing and sintering steps are performed.

Further, the shape of the hollow hole having an upright portion and a curved portion communicating with each other of the coupling means is provided in a mold having a contour shape of the upper and side coupling means and the lower flat surface. Inserting step of positioning core, injection step of filling metal powder into the mold where core is placed, molding step of removing core by vaporization or melting to form green body, binder from green body The degreasing process and the sintering process of the degreased green body are performed. The degreasing process and the sintering process are performed by placing the green body on a tray and heating the metal body by placing the flat surface formed below the tray on the lower side. A method of manufacturing a housing is provided. Here, the core is preferably formed of an acrylic resin, and is dissolved by a solution of the acrylic resin in a molding process,
The metal powder contains a polyoxymethylene resin and a paraffin wax, and a binder is added to the metal powder in an amount of 5 to 1%.
It is proposed to mix and knead within a range of 5% by weight. Furthermore, the molded green body in the degreasing step is 50
Preventing deformation of the green body after the molding step by suppressing the temperature rise up to 400 ° C. within 100 ° C./hour and setting the pressure between at least 50 to 250 ° C. within 500 torr; Provides a method of manufacturing a metal housing, wherein an inert gas or air is used as a carrier during a degreasing process, and a binder is effectively removed.

According to another aspect, the present invention provides a method for connecting a signal transmission coaxial line from one coupling means to another coupling means in a direction perpendicular to the coupling means, comprising: A metal housing having a hollow hole having a curved portion communicating with these upright portions and a flat surface on the corresponding opposite side of the coupling means, and a core material for a coaxial conductor arranged along the center of the hollow hole And a method of manufacturing a coaxial connector comprising an insulating bushing member for fixing the core material at a predetermined position, wherein the metal housing has the flat surface as a mounting surface, and the core material is inserted through the hollow hole, and A method of manufacturing a coaxial connector, characterized in that an insulating bushing member is press-fitted into an upright portion and a core material is fixedly supported at a predetermined position of a metal housing.

According to yet another aspect, the present invention relates to a shape of a hollow hole communicating with an upright portion and a curved portion to a mold having a contour of an upper coupling screw and a lower flat surface in an orthogonal direction. Inserting process for positioning the core member, injection process for filling the metal powder into the mold, molding process for forming a green body by removing a portion of the core member by vaporization or dissolution, from the molded green body It consists of a degreasing step of removing the binder and a sintering step of sintering the degreased green body. The degreasing and sintering step is performed by placing the green body on a tray with its flat surface down and heating. The member has a main part of a thermoplastic resin material, a central part of a core material for a coaxial conductor and a sub part of a ceramic material at a position corresponding to a screw, and a main part of a core member is removed by heating or melting in a molding process. , Green body Through a degreasing and sintering process while leaving the material and the sub-portion of the ceramic material, one end of the core material is integrally molded into a metal housing insulated and held through the ceramic material. A method of manufacturing a coaxial connector is provided, wherein an insulating bushing member is press-fitted into a hollow hole.

[0016]

Embodiments of the present invention will be described below. In the first embodiment according to the present invention, a coupling means is provided in each of the orthogonal L-shaped directions, a hollow hole communicating between both coupling means is formed, and a flat surface is formed on the opposite side of the coupling means. It is a metal housing. The metal housing is formed by a metal powder injection molding method, and is placed on a processing tray in a degreasing and sintering process after the molding process, with the flat surface being a ground surface, and is heated. Mounting with the flat surface down is to place the molded green body exposed to high temperature and high pressure in the degreasing and sintering process in the most stable state, and the coupling means positioned above This helps to prevent deformation of the molded green body due to its own weight. The coupling means located above has a thread formed in a thin portion, and minimizes the influence of its own weight on the softening deformation of the molded green body generated during the heat treatment, which helps maintain a stable state. You will stand. Thus, the formation of such a flat surface proves to be very advantageous for producing a metal housing by a metal powder injection molding method.

According to another embodiment of the present invention, a hollow hole communicating with an upright portion and a curved portion is formed between two coupling means in orthogonal directions, and one of the coupling means is opposed to the other. The structure of a coaxial connector comprising: an outer conductor of a metal housing having a flat surface formed on the side; and a coaxial conductor of a metal core material fixedly arranged along the center of a hollow hole of the outer conductor with an insulating bushing interposed therebetween. It is a manufacturing method. That is, a metal in which a pair of ports serving as input / output terminals as coupling means are formed on orthogonal surfaces, and a hollow hole communicating between a straight upright portion and a curved portion having a predetermined curvature is formed between the ports. A housing, a coaxial conductor core having a slotted jack at one end and a pin-shaped plug at the other end, and an insulating bushing member for fixing the core at a predetermined position along the center of the hollow hole of the metal housing. The metal housing has a hollow hole made of metal powder, a coupling screw on the outer surface of the housing corresponding to one of the upright portions, and a coupling flange on the outer surface of the housing corresponding to the other upright portion. A coaxial connector is disclosed that includes a flat surface on the outer surface of the housing corresponding to the opposite side of the one port. Here, the metal housing is made of stainless steel, the surface thereof is plated with silver (Ag), the core material for the coaxial conductor is made of a strong conductive material of beryllium copper, and the insulating bushing member is made of Teflon resin material, which is the minimum required. Installed within the limits. The coaxial connector composed of these assembled components has a small reflection coefficient and suppresses the influence of the degree of signal reflection, and exhibits good VSWR characteristics up to a high frequency band as shown by the solid line of the frequency characteristics in FIG. In addition, in the assembly of a coaxial connector, a manufacturing method for improving work efficiency by using a flat surface of a metal housing as a mounting surface on an assembly jig is presented.

[0018]

Embodiment 1 As shown in FIGS. 1 and 2, a metal housing 10 according to a first embodiment of the present invention has a screw 12, which is a first coupling means, in the upper part in an orthogonal L-shaped direction, and a screw 12 in the rear. 2 having a flange 14 which is a coupling means,
On the opposite side of the coupling means, a flat surface 16 on the lower surface and a flat surface 18 on the front surface are formed. As shown in FIG. 3, a hollow hole 20 having a circular cross section communicating with each other is formed between both coupling means. The hollow hole 20 has a curved portion 22 and an upper upright portion 24 communicating with both sides thereof.
And a lateral upright portion 26. Upright part 2
4 and 26 are respectively located at corresponding portions of the coupling means, and the inner diameter thereof is larger than the inner diameter of the curved portion 22;
It is an enlarged diameter portion that becomes an inner surface step. Here, each of the upright portions 24, 26 has a wedge-shaped projection 2 at a substantially intermediate position on its inner surface.
5, 27 are formed. The enlarged diameter portion is a position where the insulating bushing member of the coaxial connector described later is mounted, and the inner surface projection acts as a locking means of this member. In addition, the projection may be a specific portion instead of the entire inner peripheral surface, if necessary, to prevent rotation of the member. Further, it is also possible to use the upright portion for preventing rotation by making the cross-sectional shape of the upright portion rectangular. However, regardless of the cross-sectional shape of the upright portion, the outer shape of the screw 12 of the coupling means is cylindrical, and a screw thread and a screw groove are formed including a thin portion which becomes a jack of the connector. The flange 14 is formed on the outer surface corresponding to the rear upright portion 26, has a thickness enough to secure the mounting strength, and has four mounting screw holes 15 formed therein. Although the outer contour of the flange is shown as substantially square, it may be rectangular or circular depending on the mounting condition, and two screw holes may be provided for miniaturization. The metal housing 10 is mechanically connected to an external connection body by a screw 12 and a flange 14. The flat surfaces 16 and 18 are effectively used for stabilizing the manufacturing and assembling work, and the accuracy and precision of the precision surface are improved. This contributes to the reliability and ease of the surface. Alternatively, other means may be used, such as both screws or flanges for the coupling means.

Next, with reference to FIGS. 4 and 5, a method of manufacturing the above-described metal housing 10 having a complicated shape will be described. According to the manufacturing method of the present invention by injection molding of metal powder from metal powder, a molded green body 30 from metal powder shown in FIG. 4 is produced according to the flow of FIG. That is, after passing through an insert step 33 of disposing the core 32 at a predetermined position of the mold 31 prepared in advance, an injection step 35 of filling the mold with a kneaded substance of the mixture 34 of the metal powder of the metal powder and the binder. Perform Here, the core 32 is molded and prepared with an acrylic resin in accordance with the contour of the hollow hole, and the mixture of the metal powder 34 is made of SUS316L metal powder and a thermoplastic resin of ethylene-vinyl acetate copolymer, polystyrene and polybutyl methacrylate. It was prepared by mixing paraffin wax with a binder and kneading the mixture in a pressure kneader at about 160 ° C. for about 1 hour. Following the injection step is a molding step 36 for dissolving and removing the core with a solution for dissolving the acrylic resin. As a result, a molded green body 30 is obtained. The green body is placed on a tray 37 in the state shown in FIG. 4 and undergoes a process of a degreasing step 38 for removing the binder in the metal powder and a sintering step 39 for sintering the degreased green body 30. As a result, a metal housing by metal powder injection molding is completed. Among such processing processes, the mold 31 is used when the shape of the casting of the housing requires a precise contour and the number of manufactured products is large, and the core 32 is prepared so as to match the contour of the hollow hole of the housing. However, since the molded green body is somewhat reduced by the degreasing and sintering processes, the size must be determined in advance in consideration of the reduction ratio. In practice, repetitive prototype experiments show reduction rates. The core can be selected from thermoplastic resins. In particular, in the present invention, an acrylic resin having a softening temperature of about 90 ° C. is advantageous as a core having properties desired by experiments because it is necessary to reproduce design dimensions with high precision. I found something.
In particular, the acrylic resin selected according to the present invention has advantages in that it is stable in strength, withstands the processing temperature at the time of injection, and that the removal of the core in the molding step is reliable and easy.

The green body 30 made of a metal powder can use a binder such as ordinary polyethylene or polypropylene, which can be a metal powder of nickel, copper, titanium, iron-based material, etc. in addition to the mixture of the embodiment. In particular, the present invention carried out several preliminary experiments in order to optimize the composition ratio of the mixture, the physical conditions of the individual compositions, and the setting of the processing temperature, pressure, time, atmosphere and the like. As a result, a mixture was used in which the total amount of the binder was blended in a range of 5 to 15, preferably 8 parts by weight with respect to 100 parts by weight of a stainless steel metal powder having an average particle diameter of 10 μm. The average particle size of the metal powder is preferably selected in the range of 1 to 30 μm. If the particle size is less than this range, the amount of binder necessary for injection molding increases, and the degreasing in the subsequent steps causes deformation, cracking, swelling, etc. If the particle size exceeds this range, the metal powder and the binder are easily separated in the injection molding process, and the density after the sintering process is reduced, and the strength of the sintered product is reduced. It has also been found that the best sintered product can be obtained by selecting a binder composition containing a polyoxymethylene resin and a paraffin wax and selecting the ratio of the metal powder to the above range.

In the degreasing step, it is important to set conditions such as a heating temperature, a pressure, an atmosphere, and a temperature rise together with the sintering in the next step.
In the housing structure of the present invention, a method of arranging on a tray as shown in FIG. 4 was performed. Such placement is an effective measure to prevent deformation of the green body 30 during the heat treatment, and it has been found that as a treatment for a stable state, the occurrence of cracks and breakage is greatly reduced. That is, the green body 30 has a flat portion 46 formed on the lower surface opposite to the upper coupling screw portion 42.
6 is placed on the flat surface of the tray 37, the green body 30 is stably supported by its own weight, and is laid and heated. As a result, even at a high temperature exceeding 1300 ° C. at the time of degreasing and sintering, the coupling screw portion 42 was not deformed, and the deformation of the entire molded body could be prevented. In addition, the processing conditions of the degreasing step also have a balance with the composition of the binder, and are set to 50 to 400 so as to optimize the temperature rising temperature rate and the processing atmosphere.
At a temperature rising rate of 5 to 100 ° C./hr,
The pressure between ２５０250 ° C. was set at 1 × 10 ^-4 ５００500 torr, and the atmosphere gas was treated as an inert gas or a carrier gas of air in a flow state. This condition is an effective degreasing process suitable for leaching and evaporating the paraffin wax in the binder to the surface to smoothly decompose and remove polyoxymethylene, and to prevent cracks and poor swelling. It should be noted that reducing the pressure speeds up the decomposition, but reducing the pressure beyond the range causes the green body to crack or swell due to rapid vaporization.

[0022]

Embodiment 2 In another embodiment of the present invention, as shown in FIG. 6, a disassembled state of the components is shown, in which an upright portion and a curved portion are provided between two coupling means provided in an orthogonal L-shaped direction. An L-shaped coaxial connector using, as an external conductor, a metal housing in which a hollow hole communicating with a portion is formed and a flat surface is formed on the opposite side of each coupling means. This coaxial connector
The coaxial conductor core 54 is fixedly arranged in the metal housing 10 with the two insulating bushing members 50 and 52 interposed therebetween.
An L-shaped beryllium copper coaxial conductor core material 54 is arranged along the center of (see FIG. 3) and the Teflon resin insulating bushing members 50, 52 are interposed within the minimum necessary length range of both end portions. Assembled. Here, each coupling means is a screw 12 and a flange 14. Insulating bushing members 50 and 52 whose partial cross sections are shown in FIG. 6 are arranged in the upright portions of the hollow holes communicating these portions. The L-shaped coaxial conductor core material 54 is made of tough beryllium copper, and has a slot-shaped jack 56 and a pin-shaped plug 58 formed at both ends thereof, which are pre-processed. The dielectric material minimizes the dielectric loss of the coaxial line, and the precise placement along the center of the cavity suppresses the increase in reflection coefficient over a wide band. Specifically, a significant improvement is achieved in the high frequency portion of the frequency characteristic as compared with the conventional connector. In the frequency characteristic diagram of FIG. 7, the product of the embodiment is shown by a solid line with respect to the dotted line of the conventional product, and the improvement of the high frequency band is clear. That is, the relationship between the frequency GHz and the VSWR that is the relative value of the degree of reflection is shown.
The value of SWR is 1.03 at 0.045 GHz in the embodiment,
Compared to 1.12 at 18 GHz, the conventional product
It was 1.06 at 45 GHz and 1.22 at 18 GHz. From this measurement result, it was found that the coaxial connector of the present invention greatly improved the VSWR especially at a high frequency.

FIG. 6 shows a method of manufacturing the above-described coaxial connector.
Are assembled using an assembly jig 60. The metal housing 10 integrally formed from the metal powder is placed on the assembling jig 60 with the flat surface 16 as a mounting surface,
The coaxial conductor core 54 is passed through the hollow hole of the metal housing with the jack 56 side first. The penetrated jack 56 is inserted into the center hole of the insulating bushing member 50, positioned and press-fitted into the upright portion of the hollow hole of the metal housing 10, and the coaxial conductor is placed at a predetermined position in the metal housing 10. The jack 56 side of the core member 54 is fixed. Next, the flat surface 18 of the metal housing is replaced as a mounting surface on the assembly jig 60, and the plug 58 side of the coaxial conductor core member 54 extending from the flange 14 of the metal housing is insulated in the same manner as described above. And fix it in place by press-fitting. The fixing means is mainly the inner surface projections 25 and 27 of the hollow holes (see FIG. 3).
And an indentation 51, 53 (see FIG. 6) of the insulating bushing member. The other stopper means is an axial stopper due to the step of the inner diameter of the hollow hole, and a rotation preventing function by making the cross-sectional shape rectangular. Various modifications are conceivable. As described above, the assembly of the coaxial connector is performed by the metal housing 10.
The two flat surfaces 16 and 18 can be used effectively for smoothing. In particular, the flat surface allows the metal housing 10 to stand on the assembling jig in a self-standing state, thereby simplifying and facilitating the assembling work and improving the work efficiency. As still another modification, the insulating bushing members 50 and 52 and the coaxial conductor core material 5
4 is provided with mooring means to determine the mutual positional relationship. This can be achieved by forming an uneven portion similar to the locking means or by other mooring methods.

As a modification of the embodiment of the method of manufacturing a coaxial connector of the present invention, a metal housing can be integrally formed as follows. First, an insert for positioning a core member in the form of a hollow hole communicating with an upright portion and a curved portion in a mold having an L-shaped upper coupling screw in an orthogonal direction and a lower flat surface in a contour shape. Process, injection process of filling metal powder into a mold, molding process of removing a part of the core member by vaporization or dissolution to form a green body, degreasing process of removing binder from the molded green body, and degreasing The green body is sintering, and the degreasing and sintering steps are performed by placing the green body on a tray with the flat surface facing down and heat-treating the core member. Part, the center part of the core material for the coaxial conductor and the sub part of the ceramic material at the position corresponding to the screw, the main part of the core member is removed by heating or melting in the molding process, and the core material and the ceramic are added to the green body. Leaving a sub-part of the lumber Through a degreasing and sintering process, one end of the core material is integrally molded with a metal housing insulated via a ceramic material, and then an insulating bushing member is press-fitted into a hollow hole at the other end of the core material. This is a method for manufacturing a coaxial connector characterized by being attached. In this case, one end of the core material for the coaxial conductor is previously formed integrally with the metal housing, so that the assembling work of the component assembly is simplified as compared with the above-described case. That is,
The assembly is completed by attaching one insulating bushing.

[0025]

The metal housing of the present invention, the coaxial connector using the same, and the method of manufacturing the same have the effects described in the respective embodiments. First, regarding the metal housing, a flat surface is formed, so that deformation in the processing step is suppressed.Moreover, by specifying the composition of the molding material and the processing conditions, deformation, cracking, and swelling of the complicated shape can be prevented. Block. In particular, the improvement in dimensional accuracy by metal powder molding facilitates mass production by eliminating the need for correction or molding processing as a post-process of the metal housing. In particular, the formation of the coupling screw can easily secure a perfect circle, and mass-produced and inexpensive products can be provided. In addition, the number of man-hours for machining and welding and the skill required for the conventional multi-parts are greatly reduced and the work process is simplified.

In the coaxial connector of the present invention, the metal housing of the outer conductor can be manufactured with high precision, the original design dimensions can be accurately secured, the assembly relationship between the inner and outer conductors can be arranged as designed, the variation is small, and the reflection coefficient is small. It achieves its intended purpose, such as improving frequency characteristics over a wide band with a small size. In particular, it is possible to provide a coaxial connector in which the number of components is reduced, the assembly work is simplified and simplified, the production efficiency is improved, and the cost is advantageous. In addition, it is possible to easily provide economically practical products by reducing the size of each component accompanying the miniaturization of products, thereby increasing industrial value.

[Brief description of the drawings]

FIG. 1 is a front view showing a metal housing according to an embodiment of the present invention;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a sectional view taken along the line AA in FIG. 1;

FIG. 4 is a perspective view of a molded green body in the manufacturing process of FIG. 1;

FIG. 5 is a process flow chart showing a manufacturing process of the metal housing of FIG. 1;

FIG. 6 is an exploded partial cross-sectional view showing a coaxial connector of another embodiment according to the present invention;

FIG. 7 is a frequency characteristic diagram of the present invention and a conventional coaxial connector, and

FIG. 8 is a sectional view of a main part of a conventional coaxial connector.

[Explanation of symbols]

 10: metal housing, 12: screw (first coupling means), 14: flange (second coupling means), 16, 18: flat surface, 20: hollow hole, 22: curved portion, 24, 26 : Upright portion, 25, 27: protrusion, 30: green body, 31: mold, 32: core, 33: insert process, 34: mixture, 35: injection process, 36: molding process, 37: tray 38: Degreasing process, 39: sintering process, 42: screw portion, 46: flat portion, 50, 52: insulating bushing member, 51, 53: recess, 54: core material for coaxial conductor, 56: jack, 58: plug, 60 : Assembly jig.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B22F 5/00 (72) Inventor Norio Kada 26-1, Ikeda-Kitamachi, Neyagawa-shi, Osaka Taimori Kogyo Co., Ltd. (72) Inventor Seiji Takamori 26-1 Ikeda-Kitamachi, Neyagawa-shi, Osaka Taimori Kogyo Co., Ltd. F-term (reference) 4K018 CA30 DA03 DA11 KA01 5E051 GA09 GB10

Claims (20)

[Claims] 1. A metal coupling means comprising two coupling means provided in an orthogonal L-shaped direction, a hollow hole communicating the coupling means with each other, and a flat surface formed on at least one of the opposite sides of the coupling means. Metal housing integrally formed by powder injection molding. 2. The apparatus according to claim 1, wherein said hollow hole has an upright portion and a curved portion, and said coupling means provided on the upper side in said orthogonal L-shaped direction is a screw. Metal housing. 3. A hollow mold having an upright portion and a curved portion interconnecting the coupling means in a mold having a contour of orthogonal upper and side coupling means and a lower flat surface. Insert step of positioning the core of the shape, injection step of filling the metal powder in the mold in which the core is arranged, molding step of removing the core by vaporization or dissolution to form a green body, from the green body A degreasing step of removing the binder, and a sintering step of sintering the degreased green body. In the degreasing step and the sintering step, the green body is placed on a tray, and a flat surface formed below the tray is lowered. A method of manufacturing a metal housing that is placed in a housing and heat-treated. 4. The method according to claim 3, wherein the core is formed of an acrylic resin, and the core is dissolved by a solution of the acrylic resin in the molding step. 5. The metal powder according to claim 3, wherein a binder containing a polyoxymethylene resin and a paraffin wax is blended and kneaded in a range of 5 to 15% by weight based on the metal powder. Of manufacturing a metal housing. 6. The degreasing step includes the step of removing the green body from 50 to 4.
The method for manufacturing a metal housing according to any one of claims 3 to 5, wherein the temperature rise is suppressed within 100 ° C / hour during 00 ° C. 7. The degreasing step is performed at least at 50 to 250 ° C.
7. The method according to claim 6, wherein the pressure is set within 500 torr and the binder is removed while using an inert gas or air as a carrier. 8. An outer conductor of a metal housing integrally formed with two orthogonal coupling means, a hollow hole communicating between the coupling means and a flat surface in the opposite direction of the coupling means, and the hollow means. A coaxial connector comprising: an inner conductor of a core material for a coaxial conductor disposed along a center of the hole and supported and fixed by an insulating bushing interposed at a position corresponding to the coupling means. 9. The coupling means is a screw and a flange, wherein the hollow hole has an upright portion and a curved portion,
The coaxial connector according to claim 8, wherein the core material is fixed at the upright portion by the insulating bushing. 10. A metal housing having a hollow hole communicating between an orthogonal L-shaped first and second coupling means at an upright portion and a curved portion, a jack portion at one end and a plug portion at the other end. A coaxial connector comprising: a coaxial conductor core having: an insulating bushing member for arranging and fixing the coaxial conductor core along a center of a hollow hole of the metal housing. A coaxial connector, wherein a flat surface formed at least on the opposite side of the coupling means together with the first and second coupling means is integrally formed from a metal powder. 11. The metal housing is made of stainless steel and plated with silver having a thickness of 1 to 5 μm, the coupling means is a screw and a flange, and the metal housing is free standing on a flat surface opposite to the screw. The coaxial connector according to claim 10, wherein: 12. A cross section of the hollow hole, wherein an upright portion is larger than a curved portion, and the insulating bushing member is positioned and fixed to the upright portion.
Or the coaxial connector according to 11. 13. The hollow hole has a circular cross section and an enlarged diameter portion is formed in the upright portion, and the insulating bushing member is disposed in the enlarged diameter portion to fix the coaxial conductor core in a predetermined position. The coaxial connector according to claim 12, wherein: 14. The coaxial connector according to claim 13, wherein said upright portion has locking means for fixing said insulating bushing member in a predetermined position. 15. The insulating bushing member is made of Teflon material, and projections and depressions are formed on the outer surface and the inner surface of the hollow hole so as to engage with each other, so that the movement of the insulating bushing member in the press-fitting direction is restricted. 15. The method according to claim 14, wherein
The coaxial connector according to 1. 16. The core material for a coaxial conductor is made of beryllium copper, and is processed in advance along with a jack portion and a plug portion at ends along a center line of the hollow hole, and is moored to the insulating bushing member. The coaxial connector according to claim 10 or 11, further comprising means. 17. A metal jig is mounted on an assembling jig with the flat surface of the metal housing down, and the core material is inserted into the hollow hole from above and the insulating bushing member is press-fitted. A method for manufacturing a coaxial connector according to claim 8. 18. A metal jig is placed on an assembling jig with the first flat surface of the metal housing down, and the core material is inserted into the hollow hole from above, and then the first insulating bushing material is attached to the core jig. The metal housing is press-fitted from one of the hollow holes, and then the second flat surface of the metal housing is placed downward, and a second insulating bushing member is inserted into the other of the core material. 11. The method for manufacturing a coaxial connector according to claim 8, wherein the other of the hollow holes is press-fitted. 19. In order to connect a signal transmission coaxial line from one coupling means to the other coupling means in a right angle direction, the upright portions at the corresponding positions of the respective coupling means are communicated with the upright portions. A hollow housing having a curved portion and a metal housing having a flat surface formed on the opposite side of the coupling means; a coaxial conductor core material disposed along the center of the hollow hole; A method of manufacturing a coaxial connector comprising: an insulating bushing member fixed in the metal housing, wherein the metal housing has a flat surface as a mounting surface, and the core material is inserted through the hollow hole, and the metal housing is formed in the upright portion. A method of manufacturing a coaxial connector, wherein the insulating bushing member is press-fitted and fixedly supports the core material at a predetermined position of the metal housing. 20. An insert process for positioning a core member in the form of a hollow hole communicating with an upright portion and a curved portion in a mold having a contour of an upper coupling screw and a lower flat surface in an orthogonal direction. An injection step of filling a metal powder into the mold, a molding step of removing a part of the core member by vaporization or dissolution to form a green body, and a degreasing step of removing the binder from the molded green body. And a sintering step of sintering the degreased green body. The degreasing and sintering step is performed by placing the green body on a tray with the flat surface facing down, and heating the core member. A main portion of the resin material, a central portion of the core material for the coaxial conductor and a sub-portion of the ceramic material at a position corresponding to the screw, the main portion of the core member is removed by heating or melting in the molding step, The gree Through the degreasing and sintering steps while leaving the core material and the sub-portion of the ceramic material in the body, the core material is integrally molded with a metal housing one end of which is insulated and held through the ceramic material, Thereafter, an insulating bushing member is press-fitted into the hollow hole at the other end of the core material.