JP2012025081A - Resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molding, wherein displacement of an end of a lead is prevented.SOLUTION: The resin molding includes: the lead consisting of a conductive material; and a cover that is made of a resin material and partially covers the lead. In the lead, the one end and the other end are connected through a connecting section; a side surface and lower surface of the one end, and a whole surface of the connecting section are covered with the cover; an upper surface of the one end and a whole surface of the other end are exposed from the cover. The connecting section is formed in a shape where a lateral direction of the connecting section is longer than the one end thereof, wherein the connecting section intersects with the lead in a longitudinal direction and thickness direction. A first hole is formed in the connecting section, wherein the length along the lateral direction of the hole is longer than one end thereof, and the hole penetrates the connecting section in a thickness direction. The first hole is filled with the cover.

Description

  The present invention relates to a resin molded product in which a part of a lead made of a conductive material is covered with a covering portion made of a resin material.

  Conventionally, as shown in Patent Document 1, for example, a resin injection molded product in which at least a part of a terminal is embedded has been proposed. In this terminal, a portion embedded in the resin injection molded product is formed with a fixing portion for allowing the resin at the time of injection molding to enter, and this fixing portion provides a bonding strength between the terminal and the resin injection molding product. Has been improved. Thereby, when the terminal is thermally expanded or contracted due to a change in temperature, the end of the terminal is hardly displaced.

JP 2005-205720 A

  In patent document 1, the circular hole is employ | adopted as a specific structure of an above-described fixing | fixed part (refer FIG. 9 of patent document 1). The resin at the time of injection molding enters the circular hole, and the end of the terminal is difficult to displace due to the anchor effect of the resin that has entered the hole.

  By the way, the volume and rigidity of the resin that has entered the circular hole depend on the shape of the hole. As shown in FIG. 11 of Patent Document 1, the terminal is straight, and the length in the lateral direction intersecting the longitudinal direction and the thickness direction of the terminal is constant. As a result, the diameter of the hole is shorter than the length in the lateral direction of the terminal, and the amount of resin entering the hole is limited. As a result, the resin that has entered the circular hole is bent due to thermal expansion or contraction of the terminal, and it is difficult to suppress the displacement of the end of the terminal.

  In view of the above problems, an object of the present invention is to provide a resin molded product in which the displacement of the end portion of the terminal (lead) is suppressed.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a resin molded product comprising a lead made of a conductive material and a covering portion made of a resin material and covering a part of the lead, The lead is formed by connecting one end portion and the other end portion by a connecting portion, the side surface and the lower surface of one end portion, and the entire surface of the connecting portion are covered with a covering portion, and the upper surface of one end portion. And the entire surface of the other end is exposed from the covering portion, and the connecting portion has a shape that is longer than the one end in the lateral direction intersecting the longitudinal direction and the thickness direction of the lead, The connecting portion is formed with a first hole penetrating in the thickness direction having a longer length along the lateral direction than one end portion, and the first hole is filled with the covering portion. And

  Thus, according to the present invention, the connecting portion has a shape that is longer in the lateral direction than one end portion. And the 1st hole whose length along a horizontal direction is longer than this one edge part in this connection part. According to this, the amount of the resin material (formation material of the covering portion) filled in the first hole is larger than the amount of the resin material filled in the hole having a shorter length in the lateral direction than the one end portion. Will also increase. Thereby, the quantity of the resin material (coating part) with which a 1st hole is filled is ensured, and the rigidity is ensured. As a result, the resin that has entered the first hole is prevented from being bent by the thermal expansion and contraction of the lead, and the displacement of one end is suppressed.

  Further, in the present invention, the side surface and the lower surface of one end portion are covered with the covering portion, but as described above, since the displacement of one end portion is suppressed, the displacement of one end portion, It is suppressed that a crack is generated in a portion covering the end face of one end portion of the covering portion.

  According to a second aspect of the present invention, it is preferable that the boundary between the one end and the connecting portion and the opposing region between the connecting portion and the other end be crossed by the first hole.

  According to this, the transmission of the extension of the other end due to thermal expansion to one end is blocked by the first hole. Thereby, it is suppressed that one edge part is displaced by expansion | extension of the other edge part, and it is suppressed that the site | part which coat | covers the end surface of one edge part in a coating | coated part produces a crack.

  According to a third aspect of the present invention, it is preferable that the shape of the end surface intersecting the longitudinal direction on the side surface of one end portion is a curved shape. According to this, unlike the configuration in which the end surface of one end portion is straight (angular shape), the stress is less likely to be concentrated on the portion of the covering portion that covers the end surface of the one end portion. As a result, the occurrence of cracks in the portion covering the end face of one end of the covering portion is suppressed.

  According to a fourth aspect of the present invention, a configuration in which the length along the longitudinal direction in the first hole is shorter than the length along the lateral direction is preferable. According to this, the length of the longitudinal direction in a connection part can be shortened compared with the structure where the 1st hole is circular. Furthermore, the length in the longitudinal direction of the portion covering the connecting portion in the covering portion can be shortened. By these, the increase in the physique of a resin molded product is suppressed.

  Note that the number of the first holes is not limited to one, and a plurality of the first holes may be provided as described in claim 5.

  According to a sixth aspect of the present invention, it is preferable that a second hole penetrating in the thickness direction is formed in one end portion, and the second hole is filled with a covering portion. According to this, since extension of the connecting portion due to thermal expansion is suppressed from being transmitted to the end surface of one end portion, displacement of the end surface of one end portion is more effectively suppressed. Thereby, it is suppressed more effectively that a crack arises in the part which coat | covers the end surface of one edge part in a coating | coated part.

  As described in claim 7, a configuration in which the length along the longitudinal direction of the second hole is shorter than the length along the lateral direction is preferable. According to this, the length of the longitudinal direction in one edge part can be shortened compared with the structure where the 2nd hole is circular. Furthermore, the length in the longitudinal direction of the portion covering one end portion of the covering portion can be shortened. By these, the increase in the physique of a resin molded product is suppressed.

  The second hole is not limited to a single hole, and may be a plurality of holes as described in claim 8.

  As a specific configuration of the covering portion, as described in claim 9, the covering portion includes a bottom portion and a bottomed portion formed along the edge of the bottom portion and including a side wall portion surrounding the inner surface of the bottom portion. It is possible to adopt a configuration in which a cylindrical shape is formed, and a side surface and a lower surface of one end portion are covered with a bottom portion, and an entire surface of a connecting portion is covered with a side wall portion.

  As described in claim 10, it is preferable that the upper surface of one end portion and the inner surface of the bottom portion are flush with each other. According to this, compared to a configuration in which the upper surface of one end and the inner surface of the bottom are not flush with each other, it becomes easier to connect a wire or the like as an electrical connection member to the upper surface of one end.

It is a perspective view which shows schematic structure of the resin molded product which concerns on 1st Embodiment. It is a top view which shows the lead | read | reed of FIG. It is a top view which shows the modification of a lead | read | reed. It is a top view which shows the modification of a lead | read | reed. It is a top view which shows the modification of a lead | read | reed. It is a top view which shows the modification of a lead | read | reed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing a schematic configuration of a resin molded product according to the first embodiment. FIG. 2 is a plan view showing the lead of FIG. In the following, the extending direction of the lead 10 intersects the longitudinal direction and the longitudinal direction, the direction along the thickness of the lead 10 intersects the thickness direction, the longitudinal direction and the thickness direction, and conforms to the lateral width of the lead 10. The direction is indicated as the horizontal direction.

  As shown in FIG. 1, the resin molded product 100 includes a lead 10 made of a conductive material and a covering portion 30 made of a resin material as main parts. The lead 10 has a shape extending in the longitudinal direction, and the covering portion 30 has a bottomed cylindrical shape in which one surface facing the thickness direction is opened. One end portion 11 of the lead 10 is located inside the covering portion 30, the other end portion 12 of the lead 10 is located outside the covering portion 30, and the connecting portion 13 of the lead 10 is connected to the covering portion. 30. Thereby, the lead 10 is fixed to the covering part 30, and the inside and the outside of the covering part 30 can be electrically connected via the lead 10.

  As shown in FIG. 2, the lead 10 is formed by connecting an end portion 11 and an end portion 12 by a connecting portion 13. In the present embodiment, the three leads 10 are fixed to the covering portion 30, and the side and bottom surfaces of the end portions 11 of each of the three leads 10 and the entire surface of the connecting portion 13 are covered with the covering portion 30. The upper surface 11 a of the end portion 11 and the entire surface of the end portion 12 are exposed from the covering portion 30. Thereby, the upper surface 11a of the end portion 11 and the entire surface of the end portion 12 are provided for electrical connection. Since the lead 10 is a characteristic point of the resin molded product 100 according to the present embodiment, it will be described in detail later. The end portion 11 is a portion located inside the covering portion 30 in the lead 10, and the end portion 12 is a portion located outside the covering portion 30 in the lead 10.

  The covering portion 30 includes a bottom portion 31 and a side wall portion 32 that is formed along the edge of the bottom portion 31 and surrounds the inner surface 31 a of the bottom portion 31. The bottom portion 31 covers the side surface and the lower surface of the end portion 11, and the side wall portion 32 covers the entire surface of the connecting portion 13. Thereby, the lead 10 and the covering portion 30 are integrated, and the lead 10 is fixed to the covering portion 30. As shown in FIG. 1, the upper surface 11 a of the end portion 11 is flush with the inner surface 31 a of the bottom portion 31, and the connecting portion 13 is covered with a portion along the lateral direction in the side wall portion 32.

  The bottom 31 is formed with a first recess 33 for mounting the sensor chip and a second recess 34 for mounting a processing circuit for processing the output signal of the sensor chip. The depth of each of the recesses 33 and 34 is about the thickness of each of the sensor chip and the processing circuit, and the sensor chip is mounted on the first recess 33 and the processing circuit is mounted on the second recess 34. Thus, the upper surface on which the electrode pads in each of the sensor chip and the processing circuit are formed and the inner surface of the bottom portion 31 are close to each other.

  Note that after the sensor chip and the processing circuit are mounted in the recesses 33 and 34, the sensor chip and the processing circuit are electrically connected via a wire, and the processing circuit and the lead 10 are electrically connected via a wire. Connected to. After this electrical connection, a protective resin for protecting the electrical connection portions of the sensor chip and the processing circuit is applied to the region surrounded by the side wall portion 32.

  Next, the shape of the lead 10 that is a characteristic point of the resin molded product 100 according to the present embodiment will be described in detail. As shown in FIG. 2, the connecting portion 13 has a shape in which the length along the lateral direction is longer than the length along the longitudinal direction, and is longer in the lateral direction than the end portion 11. In the present embodiment, each of the connecting portion 13 and the end portion 11 has a rectangular shape, and the shape of the end surface that intersects the longitudinal direction on the side surface of the end portion 11 has a curved shape.

  A first hole 14 penetrating in the thickness direction is formed in the connecting portion 13, and a second hole 15 penetrating in the thickness direction is formed in the end portion 11. Each of the holes 14 and 15 has a shape in which the length along the lateral direction is longer than the length along the longitudinal direction, and the first hole 14 has a length along the lateral direction rather than the end portion 11. Is getting longer. In the present embodiment, each of the holes 14 and 15 has a rectangular shape.

  Each of the holes 14 and 15 is filled with a resin material constituting the covering portion 30, and a portion filled in the first hole 14 in the covering portion 30 (side wall portion 32) is connected to the connecting portion 13 in the side wall portion 32. The part located on the lower surface of the end part 11 in the bottom part 31 is connected to the part located on the lower surface and the part located on the upper surface and filled with the second hole 15 in the covering part 30 (bottom part 31). It is connected with.

  In addition, as shown in FIG. 2, the overall shape of the connecting portion 13 including the first hole 14 forms an annular shape constituted by two portions along the longitudinal direction and two portions along the lateral direction. The end 11 is connected to one of the two portions along the horizontal direction, and the end 12 is connected to the other. In addition, the first hole 14 crosses the boundary region FA (region surrounded by the broken line) between the boundary between the end portion 11 and the coupling portion 13 and the boundary between the coupling portion 13 and the end portion 12 in the coupling portion 13. The opposing area FA is constituted only by the portions along the two lateral directions described above. The boundary between the end portion 11 and the connecting portion 13 is a broken line on the end portion 11 side along the horizontal direction in the four broken lines constituting the facing area FA, and the boundary between the connecting portion 13 and the end portion 12 is facing. It is the broken line by the side of the edge part 12 along the horizontal direction in the four broken lines which comprise area | region FA.

  Next, the effect of the resin molded product 100 according to this embodiment will be described. As described above, the connecting portion 13 has a shape that is longer in the lateral direction than the end portion 11, and the first hole 14 having a longer length in the lateral direction than the end portion 11 in the connecting portion 13. Is formed. According to this, the amount of the resin material filled in the first hole 14 (the forming material of the covering portion 30) is the amount of the resin material filled in the hole having a shorter length along the lateral direction than the end portion 11. More than. Thereby, the quantity of the resin material (coating part 30) with which the 1st hole 14 is filled is ensured, and the rigidity is ensured. As a result, the resin that has entered the first hole 14 is prevented from being bent by the thermal expansion and contraction of the lead 10, and the displacement of the end portion 11 is suppressed.

  Further, in the present embodiment, the side surface and the lower surface of the end portion 11 are covered with the covering portion 30, but as described above, the displacement of the end portion 11 is suppressed. 30 is prevented from cracking at the portion covering the end face of the end portion 11 (bottom portion 31).

  The facing area FA is traversed by the first hole 14. According to this, the transmission of the extension of the end portion 12 due to thermal expansion (elongation indicated by the white arrow shown in FIG. 2) to the end portion 11 is blocked by the first hole 14. Thereby, the displacement of the end portion 11 due to the extension of the end portion 12 is suppressed, and a crack in the bottom portion 31 is suppressed.

  The entire shape of the connecting portion 13 including the first hole 14 is annular. According to this, even if the stress along the longitudinal direction is applied to the end portion 12, the connecting portion 13 bends, so that the stress is suppressed from being applied to the end portion 11. Thereby, the displacement of the end portion 11 due to the stress is suppressed, and the occurrence of a crack in the bottom portion 31 is suppressed.

  The end surface of the end portion 11 is curved. According to this, unlike the configuration in which the end surface of the end portion 11 is straight (angular shape), it is difficult for stress to be concentrated on the bottom portion 31, and the occurrence of cracks in the bottom portion 31 is suppressed.

  The first hole 14 has a shape in which the length along the lateral direction is longer than the length along the longitudinal direction. According to this, the length of the longitudinal direction in the connection part 13 can be shortened compared with the structure where the 1st hole 14 is circular. Furthermore, the length in the longitudinal direction of the side wall portion 32 covering the connecting portion 13 can be shortened. By these, the increase in the physique of the resin molded product 100 is suppressed.

  A second hole 15 penetrating in the thickness direction is formed in the end portion 11, and the second hole 15 is filled with a resin material constituting the covering portion 30. According to this, since the expansion of the connecting portion 13 due to thermal expansion is suppressed from being transmitted to the end surface of the end portion 11, the end surface of the end portion 11 is more effectively suppressed from being displaced. Thereby, it is suppressed more effectively that a crack occurs in the bottom surface 31.

  The second hole 15 has a shape in which the length along the lateral direction is longer than the length along the longitudinal direction. According to this, the length of the longitudinal direction in the edge part 11 can be shortened compared with the structure where the 2nd hole 15 is circular. Furthermore, the length in the longitudinal direction of the bottom 31 covering a part of the end 11 can be shortened. By these, the increase in the physique of the resin molded product 100 is suppressed.

  The upper surface 11 a of the end portion 11 is flush with the inner surface 31 a of the bottom portion 31. According to this, it becomes easy to connect a wire to the upper surface 11a as compared with the configuration in which the upper surface 11a and the inner surface 31a are not flush with each other. Furthermore, in the present embodiment, the recesses 33 and 34 are formed in the bottom 31, the sensor chip is mounted on the first recess 33, and the processing circuit is mounted on the second recess 34, and the sensor chip and the processing circuit are mounted. The electric pad formed on the upper surface and the inner surface of the bottom 31 are close to each other. This facilitates wire connection between the sensor chip and the processing circuit and wire connection between the processing circuit and the end portion 11 as compared with a configuration in which the recesses 33 and 34 are not formed in the bottom 31.

  The connecting portion 13 has a shape in which the length along the horizontal direction is longer than the length along the longitudinal direction, and is covered by a portion along the horizontal direction in the side wall portion 32. According to this, even if the connecting part 13 becomes longer in the lateral direction, the shape of the side wall part 32 covering the connecting part 13 is along the longer direction, so that the size of the side wall part 32 increases. Is suppressed. Thereby, the increase in the physique of the resin molded product 100 is suppressed.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the present embodiment, an example in which the first hole 14 is rectangular has been described. However, the shape of the first hole 14 is not limited to the above example, and for example, an ellipse can be adopted as shown in FIG.

  In the present embodiment, as shown in FIG. 2, an example in which one first hole 14 is formed in one connecting portion 13 is shown. However, the number of the first holes 14 is not limited to the above example. For example, as shown in FIG. 4, a configuration in which two first holes 14 are formed in one connecting portion 13 may be adopted. it can. In FIG. 4, the 1st hole 14 is formed along with the longitudinal direction.

  In the present embodiment, an example in which the second hole 15 is rectangular has been described. However, the shape of the second hole 15 is not limited to the above example, and for example, as shown in FIG. Further, as shown in FIG. 5, a rectangular shape having a long length along the longitudinal direction can be adopted as the shape of the second hole 15. However, in any of the above-described configurations, the length in the longitudinal direction at the end portion 11 is longer than the configuration shown in the present embodiment, and the physique of the resin molded product 100 is increased. Therefore, the configuration shown in this embodiment is preferable as the shape of the second hole 15.

  In the present embodiment, as shown in FIG. 2, an example in which one second hole 15 is formed in one connecting portion 13 is shown. However, the number of the second holes 15 is not limited to the above example. For example, as illustrated in FIG. 6, a configuration in which two second holes 15 are formed in one connecting portion 13 may be adopted. it can. In FIG. 6, the 2nd hole 15 is formed along with the longitudinal direction. 3 to 6 described above are plan views showing modifications of the leads.

  In the present embodiment, a configuration example in which the covering unit 30 is mounted with a sensor chip and a processing circuit is shown. However, the covering portion 30 can also employ a configuration that does not perform the function of mounting the above-described sensor chip or processing circuit. In this case, the resin molded product 100 functions only as a connector.

DESCRIPTION OF SYMBOLS 10 ... Lead 11, 12 ... End part 13 ... Connection part 14 ... 1st hole 15 ... 2nd hole 30 ... Covering part 31 ... Bottom part 32 ... Side wall part 100 ... resin molded product

Claims (10)

A lead made of a conductive material;
A resin molded product comprising a resin material, and a covering portion covering a part of the lead,
The lead consists of one end and the other end connected by a connecting portion,
The side surface and the lower surface of the one end portion and the entire surface of the connecting portion are covered with the covering portion, and the upper surface of the one end portion and the entire surface of the other end portion are exposed from the covering portion. And
The connecting portion has a shape that is longer in the lateral direction intersecting the longitudinal direction and the thickness direction of the lead than the one end portion,
A first hole penetrating in the thickness direction and having a longer length along the lateral direction than the one end portion is formed in the connecting portion, and the first hole is filled with the covering portion. A resin molded product characterized by   The boundary region between the one end portion and the connecting portion and the opposing region between the boundary portion between the connecting portion and the other end portion are crossed by the first hole. Resin molded products.   The resin molded product according to claim 1 or 2, wherein a shape of an end surface intersecting the longitudinal direction on a side surface of the one end portion is a curved shape.   The resin molded product according to any one of claims 1 to 3, wherein a length along the longitudinal direction in the first hole is shorter than a length along the lateral direction.   The resin molded product according to any one of claims 1 to 4, wherein a plurality of the first holes are formed in the connecting portion.   6. The second hole penetrating in the thickness direction is formed in the one end portion, and the second hole is filled with the covering portion. The resin molded product described in 1.   The resin molded product according to claim 6, wherein a length along the longitudinal direction in the second hole is shorter than a length along the lateral direction.   The resin molded product according to claim 6 or 7, wherein a plurality of the second holes are formed at the one end portion. The covering portion has a bottomed cylindrical shape including a bottom portion and a side wall portion that is formed along an edge of the bottom portion and surrounds the inner surface of the bottom portion,
9. The resin according to claim 1, wherein a side surface and a lower surface of the one end portion are covered with the bottom portion, and an entire surface of the connecting portion is covered with the side wall portion. Molding.   The resin molded product according to claim 9, wherein an upper surface of the one end portion and an inner surface of the bottom portion are flush with each other.

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