JPH10264163A - Insert die and surface mounting type connector using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert die which can be compactly manufactured without press-fitting a contact by a method wherein a protuberance group to perform a positioning of a slit of a contact member, and a protuberance group to individually press a bending part of the contact member to both side surfaces of an internal die plate, are provided in rows. SOLUTION: A slide die plate 8 has a slide mechanism 81 which moves on a base 7 in a manner to freely approach or separate from both side surfaces of an internal die plate 5. At the locations of both slide die plates 8 corresponding with both side surface lower edges of a cavity 6, a first protuberance group 83 which is apt to enter a slit of a fitting part 43, is provided in a row. On the upper surface of the slide die plate 8 corresponding with a part where a lead part 41 of a contact member 3 is bent, a second protuberance group 84 which is apt to enter a slit of the lead part 41, is provided in a row. A third protuberance group 92 prevents an injected resin from adhering to the fitting surface of the contact. A movable dip plate 9 thoroughly closes the upper surface of the cavity 6, and as a result, can be inserted in the contact while bridges on both sides are being attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a mold for manufacturing an SMT (Surface Mount Technology) type connector.

[0002] As electronic devices have become lighter and thinner in recent years, a method of SMT mounting various components mounted on these electronic devices has been frequently used. S using such SMT
Also in the MT type connector, products are becoming thinner or smaller, and accordingly, there is a demand for a narrow pitch between contacts and a reduction in height of the connector.

[0003]

2. Description of the Related Art FIGS. 10 (a) and 10 (b) are external views of a conventional SMT type connector shown in FIG.
In a conventional male connector having a pitch of about 1 mm, a fitting portion 23 serving as a contact surface of a contact 2 is juxtaposed at a predetermined interval on the upper outer surface of an insulator 1 formed by using a resin having a convex cross section. The female connector is configured by arranging, at predetermined intervals, resilient contacts on the inner wall surface of the insulator having a concave cross section that fits into the male insulator having a convex cross section. ing.

In both male and female types, the lead terminals of the connector are bent into an L shape so that they can be fixed to the pads provided on the substrate side (not shown) by soldering so as to be convenient for surface mounting on the substrate. It is configured. Hereinafter, the male connector will be described. To facilitate understanding of the description of the configuration and operation, the same portions are denoted by the same reference numerals throughout the drawings, and redundant description will be omitted.

FIG. 11 is an explanatory view of a structure and a manufacturing process of a conventional SMT type male connector. FIG. 11 (a) is a sectional view of the male connector. In the figure, reference numeral 1 denotes an insulator formed by using a resin or the like, 2 denotes a contact, 21 denotes a lead portion, 22 denotes a horn-shaped protrusion for positioning and preventing falling off, and 23 denotes a contact 2. 3 shows a fitting portion of the first embodiment. 11 is an insulator 1 for press-fitting the bulge 22 of the contact 2.
The reference numeral 12 denotes a locking hole for holding the tip of the fitting portion 23 of the contact 2.

FIG. 11B is an enlarged external view of a single contact, and FIG. 11C shows a contact member formed by pressing a metal plate. In the figure, reference numeral 3 denotes a contact member formed by pressing a metal plate serving as a conductor material of the contact to form a plurality of contacts in an interdigitated shape. Parts 31a, 31b
And a plurality of pilot holes 32, between which the lead 2
1. The contact 2 formed by connecting the bulge 22 and the fitting portion 23 is formed into an IDT shape. Thereafter, the bulge 22 is bent at a right angle between the bulge 22 and the fitting portion 23.

[0007]

The cross-sectional view of the contact shown in FIG. 11D has a shape corresponding to the GG direction shown in FIG. 11B, and is conventionally used for punching a contact. Is punched out by a press punch 24 in the direction of the arrow, and this causes a return 26 and a droop 25 on the punched surface. Among the connector performances, regarding the connection between the plug and the jack, the contact between the return 25 and the wholly 26 has a sharp frictional surface, so that the frictional resistance at the time of the connection of the connector increases. Therefore, the uneven surfaces of the bulge 22 are arranged so as to face each other.

FIG. 11 (e) is a rear perspective view of the insulator of FIG. 11 (a), showing the arrangement of the square holes 11 and the corresponding locking holes 12. In order to facilitate press-fitting of the square hole 11 on the back side from the tip of the fitting portion 23 of the contact 2 shown in FIG. 11B, the pitch of the plurality of fitting portions 23 is determined by using a jig or the like. Press in while holding together. Since the fitting portion 23 of the contact 2 is curved, the square hole 11 is provided in a substantially square shape close to a convex shape.

[0009] However, a plurality of fitting portions are required by using a jig.
The means for keeping the pitches of 23 is easy to accompany abnormal deformation such as falling or fluttering (parallelogram) between the contacts 2 that should be parallel to each other, and has a drawback that correction cannot be made in many cases.

When the miniaturization of the connector is promoted, FIG.
In (a), when the tip of the fitting portion 23 of the contact 2 is pressed into the square hole 11, the thickness (dimensions L and M) of the resin wall required for the insulator 1 is naturally reduced. There is a problem that the square hole 11 of the body 1 cannot be press-fitted due to a crack or the like, or the protrusions of the adjacent bulges 22 come into contact with each other.

When the tip of the fitting portion 23 of the contact 2 is press-fitted into the square hole 11, there is a method in which the contact 2 is bent without forming without bending, but the contact bending shown in FIG. As shown in the process diagram, when the bottom surface of the insulator 1 is used as a reference for bending, the rigidity of the insulator 1 corresponding to the bending stress decreases when the thickness of the insulator 1 decreases as the product becomes smaller. Cracks occur.

In the case of bending with a tool as a reference, a space for inserting the tool 27 is required as shown in the figure, and there is a disadvantage that the size is increased. Therefore, the conventional SMT type connector has a problem that the press-fitting of the contact can be performed only for a large product and a large thickness.

An object of the present invention is to provide an insert die for an SMT connector which can be manufactured in a small size without press-fitting a contact.

[0014]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following technical means. That is, in the insert die according to claim 1 of the present application, a plurality of contacts provided in a parallel bar through a slit and having a plurality of contacts bent in an L-shape are embedded in an insulator to be molded. A mold, a middle plate serving as a bottom surface of a cavity having an open top surface and both left and right sides, and a base for supporting the middle plate from below, and forming front and rear sides of the cavity; and A pair of slide mold plates having a slide mechanism capable of moving on the base so as to freely contact and separate from both side surfaces of the middle plate, and forming left and right side surfaces of the cavity when abutting on the middle plate;
A movable mold plate closing an upper surface of the cavity, and the two slide mold plates have a position corresponding to a vicinity of a lower edge portion on both left and right side surfaces of the cavity and a vicinity of a paired edge of both slide mold plates, respectively. A first and a second projection group for positioning the slit of the contact member are arranged in a row, and the movable mold plate is configured to individually press the bent portions of the contact member against both side surfaces of the middle plate. It is characterized in that the projection groups are arranged in a row.

In the insert mold according to the second aspect of the present invention, the two slide mold plates have a convex portion having an inclined surface on an upper surface, and are always in contact with both side surfaces of the middle mold plate via elastic members. Being separated, the movable mold plate has a concave portion having an inclined surface on the lower surface, and the slide mold plate, when the mold is closed, the convex portion fits into the concave portion, and the elastic member is moved. It is characterized by being deenergized and clamped.

According to a third aspect of the present invention, there is provided a surface mount type connector in which a plurality of contacts, which are provided through a slit between parallel bars and are bent in an L-shape, are embedded in an insulator. A surface mounting type connector comprising: a side wall surface formed along a longitudinal direction of the insulator, wherein fitting portions of the plurality of contacts having embedding protrusions are formed by molding and embedding, The lead portion of the contact is characterized in that an outer surface near the bent portion is embedded in a mold.

That is, when the mold is opened, one of the crosspieces of the contact member is inserted into a gap formed between the middle plate and the two slide plates, and the first protrusion is freely inserted into each slit near the bent portion. After the positioning of the contact member with the group and the second protrusion group, the movable mold plate is lowered and the molds of both slide mold plates are clamped. In this state, the injection molding can be performed on the contact embedded and arranged with high precision, and the deformation of the contact due to the injection pressure of the resin can be prevented.

Further, the effect of preventing the deformation of the contacts due to the injection pressure of the resin has the effect of enabling the pitch dimension between the contacts to be reduced.

[0019]

Embodiments of the present invention will be specifically described below. FIG. 1 is an external view of an embedding contact member to be inserted into a mold of the present invention, and reference numeral 3 denotes a contact member. The contact member 3 is formed by stamping a metal plate by press working to provide a parallel lead-side bar 31a, a fitting-side bar 31b, and a plurality of pilot holes 32a and 32b. It is shaped into an interdigitated shape.

The contact 4 is formed so as to connect the lead portion 41 and the fitting portion 43 to each other, and then bent at a right angle between the lead portion 41 and the fitting portion 43 to be formed. This contact 4 is a conventional contact 2 shown in FIGS. 11B and 11C.
The difference is that the bulge 22 is not formed.

FIG. 2 is an enlarged view of the back surface of the contact member of FIG. 1. Tapered embedding projections 44 are press-formed on both side surfaces of the fitting portion 43, respectively.
Reference numeral 44 denotes a projection for allowing the resin to wrap around the gap between the tapered portion of the embedding projection 44 and the side wall of the cavity when the resin is injected, and to hold the side surface of the fitting portion 43 with the resin. It has a function that replaces the locking hole 12 in the example of FIG.

A notch 45 is press-formed in advance so that the fitting side bar 31b can be easily broken off when the mold is opened after the injection molding. FIG. 3 is an explanatory view of the arrangement and operation of the insert mold structure according to the present invention. Since the mold is configured to be symmetrical in the left-right direction, each component having a symmetrical configuration is denoted by the same reference numeral. FIG. 3A is a cross-sectional view when the mold is clamped. In the figure, reference numeral 5 denotes a medium-sized plate, and reference numeral 6 denotes a cavity for resin injection. The top surface of the medium-sized plate 5 forms a bottom surface of the cavity 6 for resin injection.

Reference numeral 7 denotes a base on which the middle plate 5 is integrally protruded;
Has a slide mechanism 81 capable of moving on the base 7 so as to be able to freely move toward and away from both side surfaces of the middle plate 5, and a pair of slide dies for forming both side surfaces of the cavity 6 when contacting the middle plate 5. Show the board.

Reference numeral 82 denotes an elastic member which is urged in a direction for pushing the pair of slide mold plates 8 away from the middle mold plate 5, respectively.
A counterbore hole or the like is provided on the wall surface of the slide die plate 8 facing the wall surface of the middle plate 5, and a spring is compression-fitted therein, for example.

Reference numeral 9 denotes an elastic member which closes the upper surface of the cavity 6 and is placed on the upper surface of the middle plate 5 and pressed down.
A movable mold plate having a tapered portion 91 that presses and moves both slide mold plates 8 in the mold closing direction against the bias of 82 is shown. In addition,
The runner part for injecting the resin is injected into the cavity 6 from a direction perpendicular to the paper surface,
FIG. 8 shows the structure later.

FIG. 3B is an enlarged sectional view showing the vicinity of the cavity. When the two slide templates 8 are separated from the middle template 5,
In the gap formed between the middle plate 5 and both slide plates 8, for example, the fitting side bar 31 of the contact member 3 shown in FIG.
b is inserted face-to-face, and the contact member 3 which has been clamped is indicated by a thick line. At the positions of both slide mold plates 8 corresponding to the lower sides of both sides of the cavity 6, first protrusion groups 83 (see FIG. 4 for details) which are easily inserted into the slits of the fitting portion 43 are arranged. .

At a position on the upper surface of the slide die plate 8 corresponding to a portion where the lead portion 41 of the contact member 3 is bent, a second projection group 84 (see FIG. Are arranged in a row.

Reference numeral 92 denotes a third group of protrusions for individually pressing the bent portion of the contact member 3 in the cavity 6 against the opposing surfaces of the two slide mold plates 8 serving as the side walls of the cavity 6. As shown in FIG.

FIG. 3C is a partially enlarged view of the back surface of the movable mold plate, and the third protrusion group 92 individually presses the bent portion of the contact 4 against the side wall of the cavity. It has the function of preventing the injection resin from adhering to the mating surface. Reference numeral 93 denotes an escape groove corresponding to the second projection group 84 arranged in the slide die plate 8 in FIG. 3B. Thereby, the movable plate 9 can close the upper surface of the cavity 6 without any gap.

FIG. 4 shows a perspective view and a partially enlarged view of a main part of a group of protrusions provided on the slide mold plate. The first projection group 83 is a projection group which is freely provided in each slit portion near the tip of each fitting portion 43 of the contact member 3 shown in FIG. Molding. The first projection group 83 has a function of accurately positioning each fitting portion 43 of the contact member 3 in the cavity.

Further, the second projection group 84 is a projection group which is freely provided in each slit portion in the bent portion on the lead portion 41 side of the contact member 3 shown in FIG. To facilitate insertion. The second projection group 84 has a function of accurately positioning the bent side of each fitting portion 43 of the contact member 3 in the cavity, and is provided along the upper edge of the cavity side wall formed by the slide mold plate 8. The square groove 85 has a function of wrapping around and holding the resin so as to cover the outer surface of the bent portion of the lead portion 41 when the resin is injected.

FIG. 5 is an external view of a main part when the contact member is positioned on the slide mold plate. The position of the contact member 3 positioned on the slide template 8 is accurately maintained by inserting the first and second protrusion groups into the respective slit portions of the plurality of contacts formed in a blind shape, Further, at the time of mold clamping, the lead side rail 31a is pressed and fixed by the movable die plate 9 and the fitting side rail 31b by the slide die plate 8 as shown in FIG. 3 (a). The contact can be prevented from being deformed or fallen.

Reference numeral 81 denotes a slide mechanism for moving on the base, and reference numeral 86 denotes a tapered portion 91 of the movable mold plate 9 shown in FIG.
2 shows a tapered portion for sliding in the mold clamping direction under the pressure of the pressure.

FIG. 6 is a sectional view showing a state in which the mold is opened and the connector is taken out after the resin is injected into the cavity 6 in FIG. The pressing by the tapered portion 91 is released, and the two slite mold plates 8 are pushed right and left by the elastic member 82, and
Since a gap is formed between the first and second slide mold plates 8, the contact member 3 is taken out in a state where an insulator formed of a resin remains attached. Needless to say, an eject mechanism or the like (not shown) is used for this removal.

FIG. 7 is an enlarged sectional view of the connector taken out of the mold after molding. Thereafter, the lead portion 41 is cut to a predetermined length, and the fitting portion 43 is easily cut off at the notch 45.

FIG. 8 is an external view of the mold before the resin injection with the movable mold plate removed, showing a runner portion 71 for resin injection.
Shows the shape and the position where they are arranged. The left and right side surfaces in the moving direction of the slide template 8 are also provided with a slide mechanism between the base 7.

FIG. 9 is a view showing the shape of the connector which has been formed. FIG. 9A is an enlarged cross-sectional view, and FIG. 9B is an external view. When this enlarged cross-sectional view is compared with the conventional male connector shown in FIG. FIG.
The dimensions L and M of (a) are reduced in size, so that the conventional strength for withstanding press-fitting becomes unnecessary, and the thickness can be reduced to a thickness sufficient to hold the periphery of the base of the fitting portion with resin. Since the root of the fitting portion is covered with the mortar, there is an effect of preventing a phenomenon in which the solder melted at the time of soldering the lead portion travels along the contact and rises to the surface of the fitting portion.

Further, the protrusion necessary for forming the locking hole 12 for holding the tip of the fitting portion also utilizes the effect that the embedding projection 44 shown in FIG. As a result, embedding and holding can be performed, and it is not necessary to form a curved shape in the fitting portion.

Further, the pitch interval could be greatly reduced. Incidentally, the SMT type male connector completed by using the insert mold of the present invention has a height of 1.5 mm,
Standard products with a width of 4.0 mm, a pitch of 0.5 mm, and 30 to 200 poles can now be manufactured.

In the above description, the base has been described as being on the fixed side. However, the present invention is not limited to this, and the movable mold plate may be configured on the fixed side. It goes without saying that it is also possible in the vertical direction.

[0041]

According to the method of inserting a contact bent into an L-shape into a mold having a slide mechanism, it is possible to insert the contact with the both sides of the contact attached to the contact. It is possible to prevent a product failure due to the contact falling down before the insertion and a damage of the mold due to a pitch shift, and it is possible to secure the surface accuracy of the lead terminal that comes into contact with the substrate surface, which is a problem of SMT.

[Brief description of the drawings]

FIG. 1 is an external view of an embedding contact member to be inserted into a mold of the present invention,

FIG. 2 is an enlarged view of the back surface of the contact member of FIG. 1;

FIG. 3 is an explanatory view of the arrangement and operation of the insert mold structure of the present invention;

FIG. 4 is a perspective view and a partially enlarged view of a main part of a projection group provided on a slide template,

FIG. 5 is an external view of a main part when a contact member is positioned on a slide template,

FIG. 6 is a sectional view showing a state in which a mold is opened and a connector is taken out;

FIG. 7 is an enlarged sectional view of the connector taken out of the mold after molding;

FIG. 8 is an external view of a mold before a resin injection with a movable mold plate removed,

FIG. 9 is a view showing a shape of a connector after completion of molding.

FIG. 10 is an external view of a conventional SMT type connector,

FIG. 11 is an explanatory view of a structure and a manufacturing process of a conventional SMT type male connector.

[Explanation of symbols]

 3: Contact member 4: Contact 5: Medium plate 6: Cavity 7: Base 8: Slide plate 9: Movable plate 31a: Lead side bar 31b: Fitting side bar 81: Slide mechanism 82: Elastic member 83: No. 1st projection group 84: second projection group 91: tapered portion 92: third projection group

Claims (3)

[Claims] 1. An insert mold for embedding and molding an L-shaped contact member in which a plurality of contacts provided between slits between parallel bars through a slit are embedded in an insulator. A middle plate serving as a bottom surface of the cavity having an opening, a base for supporting the middle plate from below, and forming front and rear side surfaces of the cavity, and being freely movable toward and away from both side surfaces of the middle plate. A pair of slide templates that have a slide mechanism that can move on the base, and that form the left and right sides of the cavity when abutting on the middle plate; and a movable template that covers the upper surface of the cavity. The slits of the contact member are respectively positioned at positions corresponding to the vicinity of the lower edges of the left and right side surfaces of the cavity and near the paired edges of the two slide templates. A first and a second projection group are arranged in a row, and the movable mold plate is provided with a third projection group which individually presses a bent portion of the contact member against both side surfaces of a middle plate. An insert mold, characterized in that: 2. The two slide mold plates each have a convex portion having an inclined surface on an upper surface, and are always separated from both side surfaces of a middle mold plate via an elastic member. 2. The slant mold plate having a concave portion having an inclined surface on a lower surface, wherein when the mold is closed, the convex portion fits into the concave portion, deenergizes the elastic member, and is clamped. 3. Insert mold as described. 3. A surface mount type connector in which a plurality of contacts provided between slits provided between parallel crossbars and bent in an L-shape are embedded in an insulator and are formed. On the side wall surface formed along the longitudinal direction of the body, fitting portions of the plurality of contacts having embedding protrusions are formed by mold embedding, and the lead portions of the contacts are formed on the outer surface near the bent portion. Surface mount type connector characterized by being embedded in a mold.