JP7126614B2 - RESIN MOLDED PRODUCT AND RESIN MOLDED PRODUCTION METHOD - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin molding having metal terminals inside.

BACKGROUND ART As a background art related to the present invention, there is known a molded part (resin molded body) described in Japanese Unexamined Patent Application Publication No. 2006-229090 (Patent Document 1). Patent Document 1 describes in paragraph 0029 that the resin composite molded body is configured as follows.

"The primary molded product 1 has a plurality of metal electrical connection terminals 2 arranged in parallel as an insert, and furthermore, the primary molded product 1 has a plurality of electrical connection terminals 2 arranged in parallel. A low-elasticity material (stress absorbing structure) 4 softer than the primary molding resin 3, such as a rubber material or an elastomer material, is formed in the central portion so as to be aligned in the same direction as the electrical connection terminals 2. 1 resin part) 3. The primary molding resin 3 constituting the primary molding product 1 is composed of PBT resin filled with 30 to 40% glass filler. It has a main surface 32 and a second main surface 34 opposite thereto The electrical connection terminal 2 has a contact surface 2b and a bonding surface (metal portion) 2a for electrical connection with the outside. , and these are exposed to the surface (first main surface 32) from the primary molding mold resin 3."
Note that the reference numerals in the above description are the reference numerals described in Patent Document 1 and have nothing to do with the reference numerals used in this specification.

Japanese Patent Application Laid-Open No. 2006-229090

In a resin composite molded body having therein terminals for electrical connection (hereinafter referred to as metal terminals), the metal terminals are deformed by the force of resin flow when resin is injected into a mold. In the conventional molding method, in order to prevent deformation of the metal terminal due to resin flow, a method of sandwiching and fixing the metal terminal between metal molds is widely used.

The molding method using the conventional method of sandwiching metal terminals between metal molds has the following problems. Since the part where the metal terminal is sandwiched and fixed (hereafter referred to as the fixing part) has an exposed shape that exposes the metal terminal to the outside air, secondary processes such as sealing the exposed part and assembling parts to ensure airtightness are required. become necessary. For example, there is a process of sealing the exposed portion using a sealant, and a process of assembling and sealing parts such as a cover that ensure airtightness. Therefore, in the case of the conventional molding method, there is a problem that the steps required for manufacturing are increased.

In addition, the exposed shape formed by the fixing portion causes a decrease in the rigidity of the surrounding resin that fixes the metal terminal and a decrease in the holding force of the resin for the metal terminal. A decrease in the holding force of the metal terminal due to the resin causes a gap (interface gap) between the resin and the metal terminal. When the metal terminal resonates due to ultrasonic vibrations when the metal terminal and the circuit board are bonded by wire bonding or the like, the frictional force required for bonding the resin and the metal terminal decreases. A reduction in the rigidity of the resin surrounding the metal terminal and an interfacial gap between the resin and the metal terminal destabilize the bonding strength between the resin and the metal terminal.

When molding is performed without using a method of sandwiching the metal terminal between dies, it is possible to reduce the sealing process of the exposed portion formed in the fixed portion, and the bonding strength of wire bonding is stabilized. However, the metal terminal in the unfixed state moves as if it is washed away by the force of resin flow, and the resin solidifies in a displaced or deformed state. Displacement or deformation of the metal terminal creates a gap between the metal terminal and the mold applied to the surface of the metal terminal exposed from the resin for purposes such as wire bonding (hereinafter referred to as the exposed surface). When the resin flows into this gap, resin covering occurs on the exposed surface of the metal terminal.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a molded resin article in which the metal terminals are less likely to be displaced or deformed during resin molding, and the exposed surfaces of the metal terminals are less likely to be covered with resin.

In order to achieve the above object, the resin molding of the present invention is
a metal terminal;
a resin member for insert-fixing the metal terminal;
a gate portion formed in the resin member,
The metal terminal has an exposed surface exposed from the resin member,
The resin member has a first principal surface to which the metal terminal is inserted and fixed, a second principal surface which is a back surface of the first principal surface, and a groove-shaped portion formed on the second principal surface and having an inclined surface. , has
at least a portion of the inclined surface is formed within a projection area obtained by projecting the exposed surface onto the second principal surface in a direction perpendicular to the exposed surface;
Further, the inclined surface is inclined so as to approach the metal terminal as it goes downstream along the resin flow direction,
The groove-shaped portions are alternately arranged in two rows in a direction transverse to the resin flow direction.

According to the present invention, the exposed surface of the metal terminal is pressed against the mold due to the effect of resin flow along the inclined surface, thereby suppressing displacement or deformation of the metal terminal. As a result, the exposed surface of the metal terminal is prevented from being covered with resin, and deformation of the entire metal terminal is suppressed.
Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a plan view of the overall external appearance of a resin molded body according to an example of the present invention; FIG. FIG. 1B is a cross-sectional view showing one cross-section of the resin molded body of FIG. 1A in a direction perpendicular to the paper surface of FIG. 1A; FIG. 1B is a cross-sectional view taken along the line II-II of FIG. 1A; 2B is an enlarged sectional view showing one of the plurality of grooves shown in FIG. 2A and the vicinity of the metal terminal corresponding to this groove; FIG. FIG. 4 is a plan view for explaining the effect of grooves in the mold; It is a perspective view which shows the modification (1st modification) of the groove|channel which provided the flat part in the groove|channel. 4B is an enlarged sectional view showing one of the plurality of grooves shown in FIG. 4A and the vicinity of the metal terminal corresponding to this groove; FIG. FIG. 4B is a perspective view showing a modified example (second modified example) in which the arrangement of the plurality of grooves shown in FIG. 4A is changed; FIG. 4B is a perspective view showing a modified example (third modified example) in which the arrangement of the plurality of grooves shown in FIG. 4A is changed;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In each figure, the same code|symbol is attached|subjected to the common structure, and description is abbreviate|omitted. In the following embodiments and modifications thereof, the cross-sectional shapes of the metal terminals 2a, the grooves 5A and 5B, and the mold projections 7a will be described. It is a cross-sectional shape seen from a direction parallel to a mold surface forming a front surface (first main surface) 1aa and a back surface (second main surface) 1ab of a portion 1a, or a front surface 1aa and a back surface 1ab.

FIG. 1A is a plan view of the overall appearance of a resin molded body 1 according to one embodiment of the present invention. FIG. 1B is a cross-sectional view showing one cross-section of the resin molding 1 of FIG. 1A in a direction perpendicular to the paper surface of FIG. 1A.

The resin molded body 1 is formed by resin-molding metal terminals (electrical conductors) 2a and 2b, which are insert parts. For this reason, the resin molded body 1 is sometimes called a resin composite molded body. Although the resin molding 1 of this embodiment is configured as an air flow meter side device, it is not limited to the air flow meter side device. The resin molding 1 receives power from an external device and includes a connector 3 for exchanging electrical signals with the external device. The metal terminal 2a and the metal terminal 2b are formed as one member, and the metal terminal 2b is exposed in the connector 3 and constitutes a connection terminal to be connected to a connector from an external device.

FIG. 2A is a cross-sectional view taken along line II-II of FIG. 1A.

Arrow A1 indicates the direction along the overall flow of resin (hereinafter referred to as resin flow direction). A gate 17 (see FIG. 1) for injecting resin is located upstream of the resin flow and is located on the right side of FIG. 2A (outside of the figure).

The resin molded body 1 has a metal terminal 2a partially embedded in a resin portion (resin member) 1a and a groove (groove-shaped portion) 5A formed in the resin portion 1a. The grooves 5A are provided on the back surface 1ab opposite to the surface 1aa of the resin portion 1a on which the metal terminals 2a are arranged so as to correspond to the plurality of metal terminals 2a. 5 A of groove|channels comprise the concave-shaped part hollowed from the back surface 1ab of the resin part 1a.

In this embodiment, four sets of metal terminals 2a and grooves 5A are provided, but the number of sets may be less than four or more than four.

FIG. 2B is an enlarged sectional view showing one of the plurality of grooves 5A shown in FIG. 2A and the vicinity of the metal terminal 2a corresponding to this groove 5A.

The metal terminal 2a has a rectangular cross section on the paper surface of FIG. 2B, and has four surfaces 2aa, 2ab, 2ac, and 2ad. The surface 2aa constitutes an electrical wiring connection surface to which electrical wiring is connected by wire bonding or the like, and is configured as an exposed surface exposed to the outside of the resin portion 1a. The surface 2ab constitutes the opposite side of the surface 2aa and is embedded in the resin portion 1a. The surfaces 2ac and 2ad constitute surfaces (side surfaces) connected to the surfaces 2aa and 2ab which form two opposite sides of the rectangular shape. The surface 2ac is located on the upstream side in the resin flow direction A1, and the surface 2ad is located on the downstream side in the resin flow direction A1. That is, the surface 2ac is located on the gate 17 side in the direction A1 along the resin flow from the gate 17, and the surface 2ad is located on the opposite side to the gate 17 side in the direction A1 along the resin flow from the gate 17.

Note that the cross-sectional shape of the metal terminal 2a is not limited to a rectangle, and may be a trapezoid or other shape. The cross-sectional shape of the metal terminal 2a is preferably quadrangular, and more preferably rectangular or trapezoidal from the viewpoints of ease of manufacturing the metal terminal 2a and cost.

The groove 5A has an inclined surface 5a and a side surface 5b, and has a triangular cross-sectional shape when viewed from a direction perpendicular to the resin flow direction A1 and parallel to the front surface 1aa and the rear surface 1ab of the resin portion 1a. It is organized as a part. The inclined surface 5a is inclined so as to gradually approach the metal terminal 2a toward the downstream side along the resin flow direction A1. The side surface 5b is parallel to the side surfaces 2ac and 2ad of the metal terminal 2a and is formed as a surface perpendicular to the resin flow direction A1. be.

The inclined surface 5a is a side surface located on the upstream side of the groove 5A in the resin flow direction A1, and the side surface 5b is a side surface located on the downstream side of the groove 5A in the resin flow direction A1. In this embodiment, the groove 5A is provided in a range overlapping with the metal terminal 2a in the resin flow direction A1.

That is, the resin molding 1 of this embodiment includes a metal terminal 2a, a resin portion (resin member) 1a for inserting and fixing the metal terminal 2a, and a gate portion 17 formed in the resin portion 1a. The metal terminal 2a has an exposed surface 2aa exposed from the resin portion 1a. The resin portion 1a includes a first main surface (front surface) 1aa to which the metal terminal 2a is inserted and fixed, a second main surface 1ab which is a rear surface of the first main surface 1aa, and an inclined surface 5a formed on the second main surface 1ab. and groove shape portions 5A and 5B having At least a portion of the inclined surface 5a is formed within a projection area L2a obtained by projecting the exposed surface 2aa onto the second main surface 1ab in a direction perpendicular to the exposed surface 2aa. Further, the inclined surface 5a is inclined so as to approach the metal terminal 2a toward the downstream side of the resin flow along the resin flow direction A1.

A downstream end portion (the deepest portion of the inclined surface 5a) 5c of the inclined surface 5b in the resin flow direction A1 is preferably located downstream of the center 2C of the metal terminal 2a in the resin flow direction A1. Further, it is preferable that the downstream end 5c of the inclined surface 5a in the resin flow direction A1 be positioned within the projection area L2a. Further, the upstream side surface 2ac of the metal terminal 2a in the resin flow direction A1 is located upstream in the resin flow direction A1 from the upstream end portion 5a1 of the inclined surface 5a in the resin flow direction A1. preferable.

In this embodiment, since the side surface 5b is formed as a surface perpendicular to the resin flow direction A1, the end portion (edge) 5b1 of the side surface 5b on the side of the back surface 1ab of the resin portion 1a (the opening side of the groove 5A) also causes resin flow. It is located upstream of the surface 2ad of the metal terminal 2a in the direction A1.

The groove 5A may be provided at a position where the inclined surface 5a overlaps the metal terminal 2a in the resin flow direction A1. That is, at least a portion of the inclined surface 5a in the resin flow direction A1 should be provided inside the range L2a in which the metal terminal 2a is embedded in the resin portion 1a in the resin flow direction A1. The grooves 5A may thus be arranged as indicated by the dashed lines 5A', 5A'' in Figure 2B.

FIG. 3 is a plan view for explaining the effects of the grooves 5A in the molds 6 and 7. FIG. FIG. 3 shows the state of the resin molding 1 during the molding process (resin molding process). In FIG. 3, arrows A2 and A5 indicate local resin flow, and arrows A3 and A4 indicate forces acting on the metal terminal 2a. Note that the groove 5A in FIG. 3 shows a state in which it is displaced from the position in FIGS. 2A and 2B.

During the molding process of the resin molded body 1, the metal terminal 2b (see FIG. 1B) is fixed by a slide piece (not shown) that forms the connector portion 3. As shown in FIG. On the other hand, the metal terminal 2a is not fixed by the slide piece and is in an unfixed state. As shown in FIG. 3, the metal terminal 2a is fixed only at the fitting portion 6a with the upper mold 6, and the resin flow A2 increases the fluid pressure at the upstream portion D of the side surface 2ac of the metal terminal 2a. This fluid pressure acts on the portion of the side surface 2ac exposed from the upper mold 6, and further causes a large fluid frictional force due to the resin flow A2 to the metal terminal 2a. Due to the action of the resin flow A2, a force A3 acts on the metal terminal 2a to move it downward (to separate it from the upper die 6), and the metal terminal 2a may be displaced or deformed.

When the metal terminal 2a is displaced or deformed, a gap is formed between the exposed surface 2aa and the contact surface of the upper mold 6, and the resin flows into this gap, causing the exposed surface 2aa of the metal terminal 2a to be covered with resin.
The exposed surface 2aa needs to be exposed from the resin portion 1a after resin molding for purposes such as wire bonding. In this embodiment, in addition to the exposed surface 2aa of the metal terminal 2a, a part of the side surface 2ac is exposed from the resin portion 1a. In the case where the resin molded body 1 is completely covered with the fixed resin portion 1a, that is, in the case where the metal terminal 2a and the upper mold 6 do not have the fitting portion 6a, the resin covering occurs similarly.

A mechanism for preventing the displacement or deformation of the metal terminal 2a and the resin covering of the exposed surface 2aa of the metal terminal 2a will be described below.

The lower mold 7 of this embodiment has a mold protrusion (protrusion) 7a. The mold protrusion 8 has an inclined surface 7aa on the upstream side in the resin flow direction.

The mold protrusion 7a has an inclined surface 7aa and a side surface 7ab, is perpendicular to the resin flow direction A1, and forms a front surface (first main surface) 1aa and a rear surface (second main surface) 1ab of the resin portion 1a. The cross-sectional shape seen from the direction parallel to the mold surface is configured as a convex portion having a triangular shape. The inclined surface 7aa is inclined so as to gradually approach the upper mold 6 and the metal terminal 2a toward the downstream side along the resin flow direction A1. An angle θ7a formed between the inclined surface 7aa and the side surface 7ab inside the lower mold 7 is an acute angle.

The inclined surface 7aa is a side surface located on the upstream side of the mold projection 7a in the resin flow direction A1, and the side surface 7ab is a side surface located on the downstream side of the mold projection 7a in the resin flow direction A1.
The top portion 7aa2 of the mold projection 7a forms the deepest portion of the groove 5A and the inclined surface 5a. The mold protrusion 7a is preferably arranged such that the inclined surface 7aa and the side surface 7ab correspond to the inclined surface 5a and the side surface 5b of the groove 5A described in FIG. 2B.

The mold projection 7a may be provided at a position where the inclined surface 7aa overlaps the fitting portion 6a of the upper mold 6 and the metal terminal 2a in the resin flow direction A1. That is, in order to manufacture the resin molding 1 by arranging the electric conductor 2a in the molds 6 and 7 and injecting the resin, the molds 6 and 7 are metal molds having an inclined surface 7aa on the upstream side in the resin flow direction A1. A die projection (projection) 7a is provided. The inclined surface 7aa is inclined so as to approach (the back surface 2ab of) the electric conductor 2a toward the downstream side of the resin flow along the resin flow direction A1. The metal terminal (electrical conductor) 2a is arranged inside the molds 6 and 7 so that at least a part of the inclined surface 7aa in the resin flow direction A1 faces the back surface 2ab of the exposed surface 2aa of the electric conductor 2a exposed from the resin 1a. placed in

The metal terminal (electrical conductor) 2a is arranged such that the downstream end portion (the top portion of the mold protrusion 7a) 7aa2 of the inclined surface 7aa in the resin flow direction A1 faces the metal terminal 2a (the back surface 2ab thereof). , may be arranged inside the molds 6,7. Further, in the metal terminal (electrical conductor) 2a, the upstream end portion 7aa1 of the inclined surface 7aa in the resin flow direction A1 is positioned downstream in the resin flow direction A1 from the upstream side surface 2ac of the electric conductor 2a in the resin flow direction. It is preferably arranged inside the molds 6 and 7 so as to be positioned at .

The arrangement of the metal terminal (electrical conductor) 2a with respect to the mold protrusion 7a described above effectively generates a resin flow A5 described below.

The resin material during filling flows toward the metal terminal 2a along the inclined surface 7aa of the mold protrusion 7a, as indicated by resin flow A5. This flow action of the resin material generates a force A4 that presses the exposed surface 2aa of the metal terminal 2a against the upper mold 96. As shown in FIG. The exposed surface 2aa of the metal terminal 2a is pressed against the upper die 6 by making the pressing force a4 larger than the force A3 that moves the metal terminal 2a downward. As a result, the displacement or deformation of the metal terminal 2a is suppressed, and the formation of a gap between the exposed surface 2aa and the upper die 6 is suppressed. As a result, the exposed surface 2aa of the metal terminal 2a is prevented from being covered with resin.

The groove 5A preferably has a shape having an inclined surface 5a on the upstream side in the resin flow direction A1, and the angle θ5a of the inclined surface 5a is formed at an obtuse angle with respect to the resin flow direction A1. If the groove 5A is not provided with the inclined surface 5a, that is, if the inclined surface 5a is a surface perpendicular to the resin flow direction A1 like the side surface 5b, the force A4 that presses the metal terminal 2a against the upper mold 96 cannot be generated. Although it can be done, it increases the fluid pressure in the upstream portion D of the side surface 2ac of the metal terminal 2a.
As a result, the downward force A3 acting on the metal terminal 2a (in the direction of separating it from the upper mold 6) increases. The inclined surface 5a of the groove 5A in this embodiment reduces the downward force A3 acting on the metal terminal 2a, thereby suppressing the displacement or deformation of the metal terminal 2a.

A cross-sectional shape of the groove 5A having the inclined surface 5a is triangular as shown in FIG. 2B. Note that the corners of the triangle may be chamfered. In this embodiment, the term "substantially triangular shape" includes a triangular shape having chamfered corners.

The inclined surface 5a preferably has a linear shape (planar shape) from the viewpoint of ease of manufacturing the lower mold 7. Deformation can be suppressed, and resin covering on the exposed surface 2aa of the metal terminal 2a can be prevented.

At least a portion of the inclined surface 5a of the groove 5A in the resin flow direction A1 is positioned in the inner area L2a of the side surfaces 2ac and 2ad perpendicular to the exposed surface 2aa of the metal terminal 2a. Thereby, the force A4 that presses the metal terminal 2a against the upper mold 96 can be applied to the metal terminal 2a.

As described above, the deepest portion 5c of the inclined surface 5a is desirably located downstream of the center 2C of the metal terminal 2a in the resin flow direction A1. For this reason, in the molding process of the resin molded body 1, the end portion 7aa2 of the inclined surface 7aa on the downstream side in the resin flow direction A1 of the electric conductor 2a is located on the downstream side of the center 2C of the electric conductor 2a in the resin flow direction A1. It is preferably arranged inside the molds 6 and 7 so as to be positioned at . As a result, the force A4 that presses the metal terminal 2a against the upper mold 96 can be applied more effectively to the portion of the metal terminal 2a on the upstream side of the center 2C.

The vertical distance l (see FIG. 2B) from the deepest portion 5c of the groove 5A to the surface 2ab facing the exposed surface 2aa of the metal terminal 2a is about 1.0 mm to 2.0 mm (1.0 mm≦l≦2.0 mm). 0 mm) is desirable. If the distance l is less than 1.0 mm, the resin member between the deepest portion 5c of the groove 5A and the surface 2ab facing the exposed surface 2aa of the metal terminal 2a is thinned, and cracks may occur in the resin member. Further, when the distance l is larger than 2.0 mm, the force A4 for pressing the metal terminal 2a against the upper mold 96 becomes small, suppressing the deformation of the metal terminal 2a by the groove 5A and preventing the exposed surface 2aa of the metal terminal 2a from being covered with resin. may be less effective in preventing

The downstream side surface 5b of the groove 5A in the resin flow direction A1 may be perpendicular to the exposed surface 2aa of the metal terminal 2a or may be inclined with respect to the exposed surface 2aa. Alternatively, the side surface 5b may be a surface having a plurality of corners or a curved surface.

The downstream side surface 5b of the groove 5A in the resin flow direction A1 may be formed on a virtual plane including the side surface 2ad of the metal terminal 2a, may be formed at a downstream position with respect to this virtual plane, or may be formed on this virtual plane. It can be formed at a position on the upstream side with respect to the plane. The position where the side surface 5b on the downstream side of the groove 5A is arranged can be adjusted by the shape of the metal terminal 2a and the resin molding 1. FIG.

[Modification 1]
This modification is obtained by changing the cross-sectional shape of the groove 5A having the inclined surface 5a in the above-described embodiment to a trapezoid. The trapezoidal shape may include chamfered corners.

4A and 4B, resin molding 1 having groove 5B having a trapezoidal cross-sectional shape will be described. FIG. 4A is a perspective view showing a modified example (first modified example) 5B of the groove 5A in which the flat portion 5d is provided in the groove 5A. FIG. 4B is an enlarged sectional view showing one of the plurality of grooves 5B shown in FIG. 4A and the vicinity of the metal terminal 2a corresponding to this groove 5B.

The groove (groove-shaped portion) 5B of this modified example has a flat portion 5d parallel to the exposed surface 2aa of the metal terminal 2a downstream from the deepest portion 5c of the inclined surface 5a of the groove 5A of the above-described embodiment, It has a trapezoidal cross-sectional shape. In this embodiment, the trapezoidal shape including the chamfered corners is referred to as a substantially trapezoidal shape.

This modification differs from the groove 5A of the above-described embodiment in that a flat portion 5d is formed, and the rest of the configuration is the same as that of the above-described embodiment. play. In this modified example, the inclined surface 5a and the deepest portion 5c of the groove 5A in the above-described embodiment are formed by the flat portion 5d of the groove 5B or the connection portion between the flat portion 5d and the inclined surface 5a.

By providing the flat portion 5d, the force of the flowing resin material continuously pressing the metal terminal 2a against the upper mold 6 in the region L5d between the side surfaces 2ac and 2ad perpendicular to the exposed surface 2aa of the metal terminal 2a. Generate A4. Therefore, a higher effect of suppressing deformation of the metal terminal 2a can be obtained.

Since the groove 5B of this modified example has the flat portion 5d, the deepest portion 5c of the groove 5B has a length corresponding to the length L5d of the flat portion 5d in the resin flow direction A1. Therefore, the deepest portion 5c of the inclined surface 5a of the groove 5A can be considered as a connecting portion between the inclined surface 5a and the flat portion 5d in the groove 5B.

Except for the plane portion 5d, the configuration and effects of the inclined surface 5a, the side surface 5b, the metal terminal 2a, and the resin portion 1a are the same as those described in the above embodiment.

In the above-described embodiment and this modified example, the configuration provided with a plurality of metal terminals 2a was described, but the number of metal terminals 2a may be one, and the number of metal terminals 2a may be other than those shown in FIGS. 2A and 4A. can.

In order to form the flat portion 5d, it is preferable to provide a flat portion on the mold protrusion 7a of the lower mold 7 shown in FIG.

[Modification 2]
As the number of grooves 5A and 5B increases, the frictional resistance and pressure resistance of the resin flow increase, so the force A4 acting on the metal terminal 2a arranged on the downstream side of the resin flow tends to decrease. There is a possibility that the effect of suppressing the deformation of In this modified example, a shape that effectively suppresses deformation of the metal terminal 2a arranged on the downstream side of the resin flow will be described.

FIG. 5 is a perspective view showing a modification (second modification) in which the arrangement of the plurality of grooves 5B shown in FIG. 4A is changed. In this modified example, for convenience of explanation, numerals 1 to 5 are added to the reference numerals of the metal terminals 2a and the grooves 5B, but the configuration and effects are the same as those of the metal terminals 2a and the grooves 5B described above.
Although the resin molding 1 of this modified example is configured using the grooves 5B of the first modified example, it may be configured using the grooves 5A.

In this modification, the grooves 5B-1 to 5B-5 are alternately arranged so that the resin material can easily flow around the metal terminals 2a-1 to 2a-5. Specifically, the grooves 5B-1 to 5B-5 are arranged so as to be divided into two rows L1 and L2 in a direction crossing the resin flow direction A1. The grooves 5B-1, 5B-3 and 5B-5 are arranged in one row L1, and the other rows 5B-2 and 5B-4 are arranged. The grooves 5B-1, 5B-3, 5B-5 correspond to the metal terminals 2a-1, 2a-3, 2a-5 in the resin flow direction A1. It is located in a position that overlaps with the The grooves 5B-2 and 5B-4 are provided at positions overlapping the metal terminals 2a-2 and 2a-4 in the resin flow direction A1 so as to correspond to the metal terminals 2a-2 and 2a-4.

That is, the grooves 5B-1, 5B-3, and 5B-5 in one row L1 are metal terminals that are arranged without one out of the plurality of metal terminals 2a-1 to 2a-5 arranged in the resin flow direction A1. The grooves 5B-2 and 5B-4 of the other row L2 are provided to correspond to the terminals 2a-1, 2a-3 and 2a-5, and the plurality of metal terminals 2a-1 to 2a-4 arranged in the resin flow direction A1. It is provided so as to correspond to the remaining metal terminals 2a-2 and 2a-4 which are arranged alternately among the 2a-5. In other words, the plurality of metal terminals 2a-1 to 2a-5 arranged in order along the resin flow direction A1 are alternately distributed to the first row L1 and the second row L2.

[Modification 3]
FIG. 6 is a perspective view showing a modification (third modification) in which the arrangement of the plurality of grooves 5B shown in FIG. 4A is changed. In this modified example, for convenience of explanation, numerals 1 to 5 are added to the reference numerals of the metal terminals 2a, but the configuration and effects are the same as those of the metal terminals 2a described above. Although the resin molding 1 of this modified example is configured using the grooves 5B of the first modified example, it may be configured using the grooves 5A.

In this modified example, the groove 5B is arranged for the metal terminal 2a-1 located on the most upstream side of the resin flow, and the groove 5B is not arranged for the other metal terminals 2a-2 to 2a-5.

The metal terminal 2a-1 located on the most upstream side of the resin flow is strongly subjected to fluid friction due to the resin flow A2, and the force A3 that moves the metal terminal 2a-1 downward is applied to the metal terminal 2a-1 located on the downstream side of the resin flow. 2 to 2a-5 is stronger than the force A3 that moves 2 to 2a-5 downward, and the metal terminal 2a-1 tends to be greatly deformed.

For the reason described above, by providing the groove 5B or 5A for the metal terminal 2a-1 located on the most upstream side of the resin flow, the effect of suppressing the displacement and deformation of the metal terminal 2a can be obtained. The metal terminal 2a provided with the groove 5B or 5A is not limited to the metal terminal 2a located on the most upstream side of the resin flow, and the metal terminal 2a on which the groove 5B or 5A is arranged according to the structure of the metal terminal 2a. can be adjusted, and grooves 5B or 5A may be provided for a plurality of metal terminals 2a that are continuous from the most upstream side.

In this modification, the number of grooves 5B or 5A formed is smaller than the number of metal terminals 2a, so that the number of thin portions formed in the grooves is reduced, and an improvement in the strength of the resin portion 1a can be expected.

In the embodiment and modification described above, the exposed surface 2aa of the metal terminal 2a is pressed against the mold due to the effect of resin flow along the inclined surfaces 5a and 7aa, thereby suppressing the displacement of the metal terminal 2a.
As a result, covering of the exposed surface 2aa with resin and deformation of the entire metal terminal are prevented. In addition, it is possible to eliminate the process of sealing the exposed portion caused by the method of clamping and fixing the metal terminal 2a and the process of assembling parts for ensuring airtightness. In addition, since no exposed portion is formed in the method of clamping and fixing the metal terminal 2a, the fixing strength of the metal terminal 2a by the resin is improved, and wire bonding is stabilized. Therefore, the bonding strength of wire bonding is improved.

It should be noted that the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are detailed descriptions for easy understanding of the present invention, and are not necessarily limited to those having all the configurations. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

DESCRIPTION OF SYMBOLS 1... Resin molding, 1a... Resin part (resin member), 1aa... Front surface (first main surface) of resin member 1a, 1ab... Back surface (second main surface) of resin member 1a, 2a... Metal terminal (electric conductor ), 2aa... the surface (exposed surface) of the metal terminal 2a, 2ab... the back surface of the metal terminal 2a, 2ac... the upstream side surface of the metal terminal 2a, 2C... the center of the electrical conductor 2a, 5A... the triangular grooved portion, 5a... Inclined surfaces of groove-shaped parts 5A and 5B, 5B... Trapezoidal groove-shaped part, 5c... Downstream end (deepest part) of inclined surface 5a, 6... Upper die, 7... Lower die, 7a Projection 7aa Inclined surface of projection 7a 7aa1 Upstream end of inclined surface 7aa 7aa2 Downstream end of inclined surface 7aa 9 Wire bonding 10 Circuit board for flow rate measurement , 17 -- gate section, A1 -- resin flow direction, L1, L2 -- row in which groove-shaped portions are arranged, L2a -- projection area obtained by projecting exposed surface 2aa onto second main surface 1ab in a direction perpendicular to exposed surface 2aa.

Claims (6)

a metal terminal;
a resin member for insert-fixing the metal terminal;
a gate portion formed in the resin member,
The metal terminal has an exposed surface exposed from the resin member,
The resin member has a first principal surface to which the metal terminal is inserted and fixed, a second principal surface which is a back surface of the first principal surface, and a groove-shaped portion formed on the second principal surface and having an inclined surface. , has
at least a portion of the inclined surface is formed in a projection area obtained by projecting the exposed surface onto the second principal surface in a direction perpendicular to the exposed surface;
Further, the inclined surface is inclined so as to approach the metal terminal as it goes toward the downstream side of the resin flow along the resin flow direction ,
The resin molded body , wherein the groove-shaped portions are alternately arranged in two rows in a direction transverse to the resin flow direction . 2. The molded resin article according to claim 1 , wherein a downstream end portion of said inclined surface in the direction of resin flow is located downstream of a center of said metal terminal in the direction of resin flow. 2. The molded resin article according to claim 1 , wherein a downstream end portion of said inclined surface in the direction of resin flow is within said projected area. 2. The molded resin article according to claim 1 , wherein an upstream side surface of the metal terminal in the resin flow direction is positioned upstream in the resin flow direction from an upstream end portion of the inclined surface in the resin flow direction. . 2. The resin molding according to claim 1 , wherein the cross-sectional shape of said groove-shaped portion is substantially triangular. 2. The resin molding according to claim 1 , wherein the cross-sectional shape of said groove-shaped portion is substantially trapezoidal.

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