JP2020009701A - Proximity sensor - Google Patents

Abstract

To provide a proximity sensor and a manufacturing method thereof which can secure strength and improve durability and can freely set an extension direction of an external cord.SOLUTION: A proximity sensor 10 has a detection unit 11 in which a detection element 21 is disposed on one side L, and an external cord 22 extending from the other side R. The proximity sensor includes: a substrate 23 having the detection element 21 fixed to one side L and the external cord 22 connected to the other side R; a case 30 that houses the detection element 21 and one side L of the substrate 23 by projecting the other side R of the substrate 23; a filling resin portion 41 that is filled in the case 30 and in which the detection element 21 is buried; a molded resin portion 42 molded integrally with the case 30 by embedding the end of the external cord 22 and the other side R of the substrate 23, and a fixing screw 50 attached to the molded resin portion 42.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a proximity sensor in which a detection element is embedded on one side and an external code of the detection element extends from the other side.

  2. Description of the Related Art Conventionally, a proximity sensor in which a detection element is buried in a resin and arranged on one side and an external code of the detection element extends from the other side is often used. For example, in Patent Literature 1 below, a proximity sensor body is configured by burying a detection element mounted on a substrate in a resin sealing portion, and extending from the resin sealing portion in a state in which an external code is connected to the substrate. Is provided. The proximity sensor is configured to be inserted into a groove provided with an inner portion wider than the opening, and to press the detection portion against the detection target portion with a fixing screw so that the sealing resin is closely attached to the detection portion. Thereby, the detection element buried in the resin sealing portion can be arranged at a predetermined position with respect to the detection target portion and can be stably maintained, so that accurate detection can be performed.

International Publication Number WO2011 / 039892

However, in such a conventional proximity sensor, when an external force is applied from an external cord in a state where the detection sensor is mounted on the detection target portion by the fixing screw, the detection portion in which the detecting element is embedded floats around the position of the fixing screw as a fulcrum. Or the position may shift. In this case, for example, the durability may be reduced, for example, a small deformation may occur and the fixing force may be reduced, or the adhesion may be reduced.
Therefore, it is conceivable that the detection element and the substrate are accommodated in a hard case and sealed with a resin, but since the extension direction of the external code is defined by the case, the degree of freedom in design or manufacturing is reduced, and Is not preferable because the production cost also increases.

  Therefore, an object of the present invention is to provide a proximity sensor and a method for manufacturing the proximity sensor, which can secure strength and improve durability and can freely set the extension direction of an external code of a detection element.

  In order to achieve the above object, a proximity sensor according to the present invention is a proximity sensor having a detection unit having a detection element disposed on one side and an external code of the detection element extending from the other side. Is fixed and the other side is connected to an external code, a case for housing one side of the detection element and the substrate and protruding the other side of the board, and a filling resin part filled in the case and having the detection element embedded therein. A molded resin part embedded with the end of the external cord and the other side of the substrate and integrally formed with the case; and a fixing screw attached to the molded resin part.

In the proximity sensor of the present invention, preferably, the fixing screw is mounted at a position of the other end between the detection element and the end of the external cord.
In the proximity sensor of the present invention, it is preferable that the molding resin portion is formed of a resin harder than the filling resin portion. It is preferable that the molding resin portion is formed of the same resin as the case or a resin having a higher heat deformation temperature than the case.

In the proximity sensor of the present invention, the end of the external cord and the detection element are connected by wiring of the substrate, the fixing screw is rotatably supported by the molded resin part, and the opposite side of the detection part from the detection surface of the detection part. The detecting unit may be pressed against the detected unit by applying pressure.
In the proximity sensor of the present invention, a plurality of external cords may be connected to different positions on one surface of the substrate.

  In the proximity sensor of the present invention, preferably, the case has an outer wall portion opened to the detection surface side and a substrate support portion that partitions the inside of the outer wall portion from the other side, and is formed integrally with the outer wall portion. And the movement of the filled resin portion to the other side is prevented by the substrate support portion. In this case, it is preferable that the outer wall portion of the case and the substrate supporting portion are arranged in a direction intersecting each other, and that the substrate is arranged in a direction intersecting the outer wall portion and the substrate supporting portion.

  In the proximity sensor according to the aspect of the invention, the case may have a protrusion protruding from the substrate support, and the protrusion may have a support surface for pressing the fixing screw. The protrusion may have a protrusion in a direction intersecting the longitudinal direction.

  In the proximity sensor of the present invention, it is preferable that the case has a case main body and a thin plate-like temporary fixing claw projecting from a side surface of the case main body.

  A method of manufacturing a proximity sensor according to the present invention for achieving the above object is a method of manufacturing a proximity sensor in which a detection element is buried on one side and an external code is extended from the other side. The element is fixed, the other side of the substrate is protruded from the case, the detection element and one side of the substrate are housed in the case, the filling resin is filled in the case, and the detection element and one side of the substrate are embedded and molded. This is a method in which a resin is integrally molded with the other side of the case to embed the end of the external cord and the other side of the substrate, and to attach a fixing screw so that it cannot be detached.

According to the present invention, since the detection element is fixed to one side of the substrate and accommodated in the case, and is embedded in the filling resin part in the case, the detection element can be arranged at a predetermined position, and the soft filling resin part can be provided. Can be held at a sufficient strength even if it is easy to adhere to the detected part by using the method.
Even if the detection element is housed in the case, the other side of the board protrudes from the case, so that an external cord can be connected to the other side of the board without being restricted by the case, and the extension direction of the external cord can be freely set. Can be set.

  On the other hand, even if the other side of the board protrudes from the case and the external cord is connected, the other side of the board and the end of the external cord are buried in the molding resin part, so that the other side of the board and the end of the external cord are connected. Can be held with sufficient strength. Further, since the molded resin portion is integrally molded with the case, one end and the other end of the proximity sensor can be firmly integrated, and the strength of the entire proximity sensor can be secured.

Since the proximity sensor having the overall strength secured as described above is mounted on the detected portion by the fixing screw mounted on the molded resin portion, it can be firmly mounted on the detected portion, and an external force is applied from the external cord in the mounted state. Even if it is performed, it is possible to maintain the mounted state stably without any deformation or decrease in the fixing force, and to improve the durability.
Therefore, according to the present invention, it is possible to provide a proximity sensor and a method of manufacturing the proximity sensor that can secure strength and improve durability and can freely set the extension direction of an external cord.

It is a perspective view of a proximity sensor concerning a 1st embodiment of the present invention, (a) is a perspective view of a side where a fixing screw is attached, and (b) is a perspective view of a detection surface side. FIG. 2 is a front view of the proximity sensor according to the first embodiment. It is a perspective view of the substrate of the proximity sensor concerning a 1st embodiment. FIG. 3 is a perspective view of a case of the proximity sensor according to the first embodiment. FIG. 2 is a cross-sectional perspective view of a case of the proximity sensor according to the first embodiment cut in a longitudinal direction. FIG. 5 is a sectional view taken along line AA of FIG. 4. FIG. 5 is a sectional view taken along line BB of FIG. 4. FIG. 3 is a partially enlarged view of a case of the proximity sensor according to the first embodiment. FIG. 3 is a front view of a fixing screw of the proximity sensor according to the first embodiment. FIG. 3 is a plan view of a fixing screw of the proximity sensor according to the first embodiment. It is a longitudinal section of the proximity sensor concerning a 1st embodiment. It is a figure showing the manufacturing process of the proximity sensor concerning a 1st embodiment, and is a perspective view showing the process of storing a substrate in a case. It is a figure showing the manufacturing process of the proximity sensor concerning a 1st embodiment, and is a perspective view showing the state where a substrate was stored in a case. It is a figure showing the manufacturing process of the proximity sensor concerning a 1st embodiment, and is a perspective view showing the state where the filling resin was filled into the case. It is a figure which shows the manufacturing process of the proximity sensor which concerns on 1st Embodiment, (a) is a perspective view which shows the state before arrange | positioning a fixed screw in a predetermined position of a case, (b) is a fixed screw in a predetermined position of a case. It is a perspective view showing the state after having arranged. FIG. 2 is a partial cross-sectional perspective view showing a state where the proximity sensor according to the first embodiment is mounted on a detection target. It is a partial plan view explaining operation of a fixed screw at the time of attaching a proximity sensor concerning a 1st embodiment to a detected part. FIG. 6 is a partial cross-sectional view illustrating an operation of a fixing screw when the proximity sensor according to the first embodiment is mounted on a detection target. It is a perspective view of the modification of the proximity sensor which concerns on 1st Embodiment, (a) is a perspective view of the side to which the fixing screw was attached, (b) is a perspective view of the detection surface side. It is a longitudinal section showing the modification of the proximity sensor concerning a 1st embodiment. It is a figure which shows the fixing screw of the proximity sensor which concerns on 2nd Embodiment of this invention, (a) is a front view, (b) is a side view, (c) is a top view, (d) is a perspective seen from the upper diagonal. FIG. It is a partial enlarged plan view explaining an operation of a fixing screw at the time of attaching a proximity sensor according to a second embodiment to a detection part, and (a) is a state before inserting a proximity sensor into a wide groove and fixing it. (B) shows a state after fixing to a wide groove portion. It is sectional drawing of the state which attached the proximity sensor which concerns on 2nd Embodiment to a to-be-detected part, and was fixed with the fixing screw.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the front end side in the axial direction set in the longitudinal direction of the proximity sensor 10 is defined as one side R, and the rear end side is defined as the other side L.
[First Embodiment]
As shown in FIGS. 1A and 1B, the proximity sensor 10 of the first embodiment includes a detection unit 11 formed in a rod shape and having a detection element 21 disposed on one side L in the longitudinal direction. The external cord 22 of the detection element 21 extends in the longitudinal direction from the other side R.
The proximity sensor 10 includes a substrate 23 having a detection element fixed on one side, a case 30 for accommodating one side of the substrate 23, a filled resin portion 41 filled in the case 30, and the other side R of the substrate 23. There is provided a molded resin part 42 which is embedded and integrally molded on the other side R of the case 30 and a fixing screw 50 for mounting on the detected part.

  As shown in FIG. 3, the substrate 23 has a fixing portion 24 to which the detecting element 21 is fixed on one side L, and a connecting portion 25 to which the external cord 22 is connected by soldering on the other side R. The fixed part 24 and the connection part 25 are connected via an appropriate circuit by board wiring, various electronic components, and the like. The substrate 23 is provided with recesses 26 recessed in the width direction from both side edges at different positions in the longitudinal direction. The detecting element 21 is fixed to the concave portion 26 on the one side L to form a fixing portion 24. The concave portion 26 on the other side R corresponds to a portion where a fixing screw 50 described later is arranged, and is provided between the fixing portion 24 and the connection portion 25.

As the detection element 21 fixed to the fixing portion 24, a reed switch, a hall element, or the like may be used, and the detection element 21 is mounted so as to be connected to a substrate circuit.
A plurality of connection portions 25 are provided on one surface of the other side R of the substrate 23 so as to be located at mutually different positions. The outer cord 22 has a plurality of wires, each of which is connected to a different connection part 25. In this embodiment, since the outer cord 22 extends in the longitudinal direction, the plurality of connecting portions 25 are arranged apart from each other in a direction intersecting the longitudinal direction.

  As shown in FIGS. 2 and 4 to 7, the case 30 is a hollow member having an opening on the detection surface 11a side of the detection unit 11, and is formed of a hard resin. The case 30 integrally includes an outer wall portion 31 having a substantially U-shaped cross section and extending in the longitudinal direction, and a substrate support portion 32 for positioning the substrate 23 disposed inside the outer wall portion 31. . The outer wall portion 31 is formed in a size that can accommodate the detection element 21 and one side L of the substrate 23. One side L in the longitudinal direction of the outer wall portion 31 is provided with an end wall 33 and is closed. In the vicinity of the end wall 33, a one-side locking portion 34a for supporting one side L of the substrate 23 is provided.

  The substrate support portion 32 is provided on the other side R in the longitudinal direction and partitions the inside of the outer wall portion 31. The substrate support portion 32 is provided with the other-side locking portion 34b that is opened in a slit shape so as to penetrate and position and support the substrate 23. The end wall 33 and the substrate support portion 32 are provided so as to protrude more toward the opening side than a pair of opposed walls 31a provided to face each other on the outer wall portion 31.

  In the case 30, a protruding portion 35 protrudes from the substrate support portion 32 to the other side R in the longitudinal direction, and is bent in a substantially L-shape in a direction intersecting with the longitudinal direction in a front view to form the outer wall portion 31 and the substrate support portion 32. It is provided integrally. The protruding portion 35 has a protruding portion opposing wall 35a that is continuous with the pair of opposing walls 31a, and a narrow opposing portion that protrudes from the protruding portion opposing walls 35a to the other side R and is provided to have a narrower width than between the protruding portion opposing walls 35a. It has a wall 36a and a protruding portion connecting wall 35b protruding from the middle of the substrate supporting portion 32 and connecting between the protruding portion opposing wall 35a and the top of the narrow opposing wall 36a. The protruding portion connecting wall 35b is provided so as to protrude from the substrate supporting portion 32 to the other side L. The protruding portion connecting wall 35b supports the pressing surface 51 of the fixing screw 50, a through hole 35d penetrating the rotating shaft 52, and a substantially L-shaped. And a protruding portion 36b which is bent in a vertical direction.

  In the case 30, a case main body 30A is constituted by an end wall 33, a substrate supporting portion 32, an outer wall portion 31, and a protruding portion 35. As shown in FIG. And a thin plate-like temporary fixing claw 37 projecting from the side surface, and a groove 38 provided in the case main body 30A adjacent to the temporary fixing claw 37.

  As shown in FIG. 11 and the like, the filling resin portion 41 is formed by filling the inside of the case 30 with a soft resin. One side R of the substrate 23 and the detection element 21 are embedded in the filling resin portion 41. As the soft resin, for example, a thermoplastic resin can be used, and in order to reduce the stress applied to the internal components, it is preferable that the resin is at least softer than the hard resin of the molding resin portion 42, and the tensile modulus is 10 MPa. It may be a thermoplastic resin of about 100 MPa. As the soft resin, it is preferable to use a resin having high compatibility with the case 30.

  The molding resin part 42 is molded of a hard resin harder than the soft resin of the filling resin part 41, and may be, for example, a thermoplastic resin having a tensile modulus of about 1000 MPa to 20,000 MPa. As shown in FIG. 11 and the like, the other side R of the substrate 23 and the end of the external cord 22 are buried and integrally joined to the other side R of the case 30. In this embodiment, of the protruding portions 35 of the case 30, the narrow opposing walls 36 a and the protruding portions 36 b are embedded in the hard resin, and the hard resin is filled between the protruding portion opposing walls 35 b. Hard resin adheres. The molding resin portion 42 is not particularly limited, but is preferably formed, for example, to have a length of 1/3 to 1/2 with respect to the entire length of the proximity sensor 10, for example, 5 mm or more and 15 mm or less. It may be length.

  As the hard resin of the molding resin portion 42, for example, a hard thermoplastic resin can be used, and it is preferable that the resin is at least harder than the filling resin. The molding resin portion 42 can be formed of the same or different resin as the resin constituting the outer wall portion 31 of the case 30 and the molding resin portion 42. In the present embodiment, the molding resin portion is formed of the same hard resin. When formed of a resin different from that of the case 30, a resin having compatibility with the resin of the case 30 and having a higher heat deformation temperature than the resin of the case 30 may be used. By molding the molding resin portion 42 using a resin having a higher heat deformation temperature than the case 30, the surface of the case 30 is melted, and the adhesion between the case 30 and the molding resin portion 42 can be improved.

  As shown in FIGS. 9 and 10, the fixing screw 50 has a head 53 on one end side, is provided so as to protrude from the head 53 in the axial direction, and has a circular cross section having a tapered shape expanding in diameter toward the end side. A rotating shaft 52. A hole or the like where a tool is locked is provided in the head 53 in the axial direction, and a circumferential inclined portion 54 that protrudes at a plurality of positions around the axis and increases the distance from the rotation shaft 52 in the circumferential direction is provided around the hole. Is provided. The head 53 is provided with a hexagonal hole and is formed rotatably by a wrench.

  The fixing screw 50 is mounted at a position between the detection element 21 and the end of the external cord 22 in the molded resin portion 42 of the proximity sensor 10, and in this state, as shown in FIG. The pressurizing surface 51, which is a surface of the head 53 on the side of the rotation shaft 52, is disposed in contact with the provided support surface 35 c. The rotating shaft 52 is inserted into the through hole 35d of the support surface 35c and is buried in the molding resin part 42. The rotating shaft 52 is rotatably embedded in the molded resin portion 42 so as to be immovable in the axial direction. By rotating the head 53, the position of the surface of each circumferentially inclined portion 54 at a predetermined position in the mounted state can be increased or decreased.

Next, a method of manufacturing such a proximity sensor 10 will be described.
As shown in FIG. 12, the detection element 21 is fixed to a fixing portion 24 formed of a concave portion 26 on one side L of the substrate 23. The end of the external cord 22 is connected to the connection portion 25 on the other side R of the substrate 23. As a result, the detection element 21 and the external cord 22 are connected via an appropriate circuit including a substrate circuit.

  One side L of the substrate 23 and the detection element 21 are housed inside the case 30, and the end of the one side L of the substrate 23 is locked by the one side locking portion 34 a, and the other side R of the substrate 23 is The support portion 32 is locked to the other side locking portion 34b. As a result, the substrate 23 is arranged substantially parallel to the opposing wall 31a of the outer wall portion 31 and is connected to the case 30 in a state where the substrate 23 stands in the width direction. That is, the board 23 is supported by the one side locking portion 34 a and the other side locking portion 34 b of the case 30, and the one side L is accommodated in the case 30, so that the outer wall portion 31 and the end wall 33 of the case 30. In addition, the substrate support portion 32 and the substrate 23 are arranged so as to be combined with each other in the cross direction.

  As shown in FIG. 13, in this state, one side L of the substrate 23 and the detection element 21 are housed inside the case 30, and the other side R of the substrate 23 projects outside the case 30, and the connection portion 25 and The end of the external cord 22 connected to the connection part 25 is arranged outside the case 30.

  As shown in FIG. 14, a filling resin made of a soft thermoplastic resin or the like is filled in a fluid state into an outer wall portion 31 partitioned from the outside by a substrate supporting portion 32 of the case 30 and solidified, thereby obtaining a case. A filling resin portion 41 is formed between the substrate 23 and the detection element 21 and the like in 30. Thus, one side of the detection element 21 and the substrate 23 is embedded in the filling resin portion 41. The filling resin portion 41 is arranged so as to protrude from an opening at an end of the outer wall portion 31, and has an outer surface formed in an outwardly curved shape. The curved surface of the filling resin portion 41 forms the detection surface 11a.

  As shown in FIGS. 15A and 15B, the fixing screw 50 is disposed on the support surface 35 c of the projecting portion 35 of the case 30, and then, the other side R of the case 30 is formed of a hard thermoplastic resin or the like. The molding resin portion 42 is formed integrally with the case 30 by the resin for use. The molding resin portion 42 has the other side of the substrate 23 protruding from the case 30 and the end of the external cord 22 embedded therein. The molding resin portion 42 is also filled in the protruding portion 35 of the case 30, and is integrally fixed to the substrate support portion 32 and the protruding portion 35. The narrow opposing wall 36a of the protruding portion 35 is embedded in the molding resin portion 42, and the width of the molding resin portion 42 is made equal to the width of the outer wall portion 31 of the case 30, so that the rod-shaped proximity sensor 10 has a substantially constant width. It is formed in appearance.

  The rotating shaft 52 of the fixing screw 50 is rotatably and irremovably embedded in the molding resin portion 42, so that the fixing screw 50 is mounted on the molding resin portion 42 so as to be arranged at a predetermined position. The concave portion 26 of the substrate 23 is disposed inside the protruding portion 35 on which the fixing screw 50 is mounted. The rotating shaft 52 of the fixing screw 50 and the concave portion 26 of the substrate 23 are vertically separated from each other in a front view, and are viewed in a plan view. Are located at overlapping positions.

  As shown in FIG. 16, the proximity sensor 10 manufactured in this manner is used by being mounted on an appropriate detected portion 70, such as in the vicinity of an operating portion of a pneumatic device. The groove 71 provided in the detected part 70 has an inner width wider than the opening 72, and the proximity sensor 10 is inserted into the inside through the opening 72, and is inserted into the groove 71 by the fixing screw 50. Fixed. 17 and 18, by rotating the fixing screw 50, the circumferentially inclined portion 54 of the fixing screw 50 is brought into contact with the inner side surface 74 near the opening 72, and the contact portion Is displaced to generate a pressing force on the bottom side of the groove 71 by the pressing surface 51. As a result, the detection surface 11a of the detection unit 11 can be pressed on the bottom of the groove 71, and the proximity sensor 10 is mounted on the detection target 70 in this state.

  According to the proximity sensor 10 and the manufacturing method thereof of the present embodiment as described above, the detection element 21 is fixed to the one side L of the substrate 23 and accommodated in the case 30, and embedded in the filling resin portion 41 in the case 30. Therefore, the detection element 21 can be arranged at a predetermined position, and can be held in the case 30 with sufficient strength even if the detection element 21 is easily adhered to the detection target portion 70 by using the soft filling resin portion 41. .

  Even when the detection element 21 is accommodated in the case 30, the external cord 22 can be connected to the other side R of the substrate 23 without being restricted by the case 30, since the other side R of the substrate 23 projects from the case 30. The degree of freedom in setting the extension direction of the external cord 22 can be provided.

  For example, as shown in FIGS. 19A and 19B and FIG. 20, by changing the direction of the external cord 22 embedded in the molding resin part 42 and molding, the extending direction of the external cord 22 from the proximity sensor 10 is changed. The direction can be set freely from a direction along the longitudinal direction of the substrate 23 to a direction orthogonal thereto. In this case, it is preferable to dispose a pair of connecting portions 25 of the substrate 23 according to the extending direction of the external cord 22, and the external cord 22 is extended in a direction intersecting the longitudinal direction as shown in FIG. In such a case, it is preferable that the plurality of connecting portions 25 be disposed apart from each other in the longitudinal direction. If the molding resin portion 42 is molded after the external cord 22 is connected, the external cord 22 can be extended in a direction intersecting the detection surface 11a.

  Even if the other side R of the substrate 23 protrudes from the case 30 and the external cord 22 is connected, the other side R of the substrate 23 and the end of the external cord 22 are buried in the molded resin portion 42, so that the The other end R and the end of the external cord 22 can be held with sufficient strength. Since the molded resin portion 42 is formed integrally with the case 30, the one end side L and the other end side R of the proximity sensor 10 can be firmly integrated, and the strength of the entire proximity sensor 10 can be secured.

  Since the proximity sensor 10 having the overall strength secured as described above is mounted on the detection target portion 70 by the fixing screw 50 mounted on the molding resin portion 42, the proximity sensor 10 can be securely mounted on the detection target portion 70 and can be externally mounted in the mounted state. Even if an external force such as pulling up and down and left and right is applied from the cord 22, deformation and fixing force are not reduced, and it is possible to stably maintain the mounted state and improve durability. is there. Therefore, the strength can be ensured, the durability can be improved, and the extension direction of the external cord 22 can be freely set.

  According to the proximity sensor 10 of the present embodiment, the fixing screw 50 is rotatably mounted on the molding resin portion 42, and the fixing screw 50 is pressed from the side opposite to the detection surface 11a to press the detection portion 11 to the detected portion 11 In the mounted state, the fixing screw 50 is arranged close to the wiring between the end of the external cord 22 and the detecting element 21 and presses the wiring. However, when the external cord 22 and the detection element 21 are connected by the wiring of the substrate 23, the arrangement of the wiring can be stably maintained during molding or use, so that even if the mounting portion of the fixing screw 50 is reduced, Poor wiring burial or deterioration is unlikely to occur. Therefore, a smaller proximity sensor 10 can be easily manufactured. Since the lower portion of the fixing screw 50 is the molded resin portion 42 formed of a hard resin, a sufficient resistance to the pressing force generated when the proximity sensor 10 is pressed by the fixing screw 50 can be secured.

  According to the proximity sensor 10 of the present embodiment, since the plurality of external cords 22 are connected to different positions on one surface of the substrate 23, compared to the case where the external cords 22 are connected to both surfaces of the substrate 23. Thus, the molding resin portion 42 in which the end of the external cord 22 and the other end of the substrate 23 are embedded can be thinly molded. Also, compared to connecting a plurality of external cords 22 at substantially the same position on both sides of the substrate 23, the influence of heat is less likely to occur between the connection portions. For example, when one external cord 22 is soldered, the other external cord 22 is connected. The solder does not peel off.

According to the proximity sensor 10 of the present embodiment, since the case 30 has the outer wall portion 31 opened on the detection surface 11a side, the filled resin portion 41 can be exposed to the detection surface 11a and can be brought into close contact with the detected portion 11. , Detection accuracy can be easily ensured. Even if the case 30 is open on the detection surface 11a side, the rigidity of the case 30 can be ensured because the substrate support portion 32 is formed integrally with the outer wall portion 31 inside the other side R of the outer wall portion 31.
Since the inside of the outer wall portion 31 is partitioned by the substrate support portion 32 for positioning and supporting the substrate 23 at a predetermined position, the case 30 is fixed to the substrate 32 by filling the filling resin portion 41 into the case 30. The detecting element 21 can be buried and arranged at a predetermined position. Therefore, the filling resin portion 41 can be reliably prevented from moving to the other side R, and desired properties of the one side L and the other side R can be respectively realized.

  According to the proximity sensor 10 of the present embodiment, since the molded resin portion 42 is fixed to the substrate support portion 32, the case 30 on one side L and the molded resin portion 42 on the other side R are more firmly joined. Therefore, sufficient strength of the entire proximity sensor 10 can be secured. Therefore, the strength of the proximity sensor 10 can be reduced while securing strength.

  According to the proximity sensor 10 of the present embodiment, since the outer wall portion 31 of the case 30, the substrate support portion 32, and the substrate 23 are arranged in a direction crossing each other, the rigidity of the proximity sensor 10 can be obtained by combining these three-dimensionally. Can be improved. Since the substrate 23 can be precisely arranged at a predetermined position, the detection element 21 can be easily arranged at a predetermined position.

  According to the proximity sensor 10 of the present embodiment, the case 30 has the protruding portion 35 protruding from the substrate supporting portion 32, and the protruding portion 35 has the supporting surface 35 c of the pressing surface 51 of the fixing screw 50. The support surface 35c can be formed flat on the case 30 in advance. Accordingly, the support surface 35c against which the pressing surface 51 of the fixing screw 50 comes into contact with and pressurizes can be easily formed flat, and it is possible to prevent the fixing screw 50 from becoming difficult to rotate or becoming hard to press due to molding failure or the like.

  According to the proximity sensor 10 of the present embodiment, the protrusion 35 has the protrusion 36b in the direction intersecting the longitudinal direction. By embedding the protrusion 36b in the molding resin part 42, the molding resin part 42 and the case 30 can be reliably prevented from coming off, and the joining strength between them can be improved. In addition, the bar-shaped proximity sensor 10 has a reinforcing structure against a load in the bending direction, so that the strength against the bending load can be improved.

  According to the proximity sensor 10 of the present embodiment, the case 30 includes the case main body 30A, the thin plate-shaped temporary fixing pawls 37 protruding from both side surfaces in the width direction of the case main body 30A, and the temporary fixing pawls 37. And a groove 38 provided in a portion adjacent to the main body 30, so that the amount of protrusion of the temporary fixing claw 37 from the connection portion with the case body 30 </ b> A can be increased by the groove 38. Therefore, the temporary fixing claw 37 can be easily elastically deformed, and can be easily temporarily fixed in the groove 71 of the detected portion 11.

[Second embodiment]
21 to 23 show the second embodiment. The proximity sensor 10 of the second embodiment has the same configuration as that of the first embodiment except that a fixing screw is different. The fixing screw 80 of the second embodiment has a head 83 formed in a shape different from the head 53 of the fixing screw 50 of the first embodiment shown in FIGS. This is the same as the fixing screw 50 of the embodiment.

  As shown in FIGS. 21A to 21D, the head 83 of the fixing screw 80 according to the second embodiment is formed integrally with the rotary shaft 52 having a tapered shape whose diameter increases toward the distal end, and has a cross section. The head body 83a has a fixed shape along the central axis of the rotating shaft 52, and a pair of locking pieces 83b protruding from the side peripheral surface of the head body 83a in a direction orthogonal to the central axis. . A hexagonal hole for locking a tool such as a wrench is provided at the center of the head 83.

  A pair of deformed curved surfaces 85 are provided on the side peripheral surface of the head main body 83a so as to be axially symmetric with respect to the central axis. Each deformed curved surface 85 has a curved surface shape whose radius gradually increases to one side along the circumferential direction with respect to the central axis. That is, each deformed curved surface 85 has a proximity position 85a closest to the central axis, a separation position 85b most apart from the central axis, and a gradually increasing and decreasing area 85c in which the radius smoothly and continuously increases and decreases therebetween. ing. The head main body 83a is formed in a column shape along the central axis by the pair of deformed curved surfaces 85. Since the head main body 83a is formed to be axially symmetric, the distance between the pair of deformed curved surfaces 85 passing through the central axis is the minimum between the pair of adjacent positions 85a, increases between the gradually increasing and decreasing areas 85c, and increases in the distance 85b. Is among the largest.

  The distance between the pair of proximity positions 85a is formed to be smaller than the width of the opening 72 of the groove 71 of the detection target 70 where the proximity sensor 10 is mounted. The distance between the pair of separated positions 85b is formed to be equal to or larger than the width of the opening 72 of the groove 71, and is formed to be larger than the width of the case 30 in the present embodiment.

  A pair of locking pieces 83b are formed at the ends of the head main body 83a on the side of the rotation shaft 52, each of which protrudes radially outward from the head main body 83a. The pair of locking pieces 83a are provided symmetrically with respect to the central axis, and are respectively provided continuously from the near position 85a to the separated position 85b through the gradually increasing and decreasing area 85c. Each locking piece 83b is formed integrally with the head main body 83a without partition, and the entire end face of the head main body 83a and the pair of locking pieces 83b on the rotation shaft 52 side is the pressing surface 51. . Each locking piece 83b has a substantially arc-shaped outer peripheral shape, the thickness in the direction along the central axis is formed substantially constant in the circumferential direction, and the outer peripheral surface opposite to the pressing surface 51 has a radial direction. A radially inclined surface is formed such that the outer side is closer to the pressing surface 51 side.

As shown in FIG. 16 of the first embodiment, the proximity sensor 10 is housed in the groove 71 of the detected part 70 and mounted using the fixing screw 80 having such a head 83 as follows. I do.
First, as shown in FIG. 22A, the head 83 of the fixing screw 80 of the proximity sensor 10 is rotated to adjust the directions of the pair of deformed surfaces 85 in the head main body 83a, and the pair of close positions 85a is adjusted. It is arranged corresponding to the width direction of the proximity sensor 10. In this state, the entire proximity sensor 10 is housed in the groove 71, and the head main body 83 a is arranged in the opening 72 of the groove 71.

  Next, by rotating the fixing screw 80 while pressing the proximity sensor 10 toward the depth of the groove 71, the directions of the pair of deformed curved surfaces 85 of the head 83 are changed, and as shown in FIG. In the width direction of the proximity sensor 10, a pair of separated positions 85b are arranged so as to correspond to each other via a pair of gradually increasing and decreasing areas 85c.

  By arranging a pair of separated positions 85b between the openings 72 of the groove 71 of the detected portion 70 in correspondence with each other, the distance passing through the central axis between the pair of deformed curved surfaces 85 of the head 83 at the position corresponding to the opening 72 can be reduced. , Approx. As shown in FIG. 23, the head main body 83a of the fixing screw 80 inside the opening 72 is pressed against the inner side surfaces on both sides of the opening 72, so that the head main body 83a of the fixing screw 80 is fixed to the opening 72. .

  On the head 83 of the fixing screw 80, a pair of locking pieces 85b are provided on the pressing surface 51 side of the head main body 83a, corresponding to the respective deformed curved surfaces 85, so as to protrude radially outward from the deformed curved surface 85, respectively. ing. When the head 83 of the fixing screw 80 is rotated to make the gradually increasing and decreasing area 85c and the separated position 85b face the opening 72, a pair of locking pieces 83b are opened in the groove 71 as shown in FIG. Inserted at a position adjacent to 72. As a result, the side surfaces of the pair of locking pieces 83 b opposite to the pressing surface 81 abut on the inner side surface 74 adjacent to the opening 72 of the groove 71.

  As a result, the fixing screw main body 83a is pressed against and fixed between the openings 72 of the groove 71, and the locking portion 83b is locked on the inner side surface 74 of the groove 71 adjacent to the opening 72. The proximity sensor 10 in a state in which the detection surface 11a is brought into close contact with the sensor by pressing the sensor toward the back can be firmly fixed. Accordingly, the proximity sensor 10 can be stably mounted in the groove 71, and even if the fixing state between the head 83 of the fixing screw 80 and the opening 72 is loosened, the pair of locking pieces 83b Is locked to the inner surface 74 of the groove 71, so that the proximity sensor 10 can be prevented from dropping out of the groove 71.

  Even with the proximity sensor 10 of the second embodiment, it is possible to obtain the same operation and effects as those of the first embodiment. In particular, in the proximity sensor 10 according to the second embodiment, the head 83 of the fixed screw 80 is, like the head 53 of the fixed screw 50 of the first embodiment, circumferentially inclined such that the distance from the rotation shaft 52 increases in the circumferential direction. Since the portion 54 is not present, the fixing screw 80 can be easily manufactured. Therefore, according to the second embodiment, the proximity sensor 10 can be manufactured more easily than in the first embodiment.

The first and second embodiments can be appropriately modified within the scope of the present invention.
For example, in the above description, the external resin 22 is connected to the substrate 23 in advance, and is housed in the case 30 and then the filled resin portion 41 is molded. 22 can also be connected.
In each of the above embodiments, the connection portion 25 on the other side R of the substrate 23 is disposed so as to protrude outside all the walls of the case 30. Even if it is arranged at a position covering the part, the present invention can be similarly applied by pulling out the external cord 22 in a direction where no wall exists. In each of the above embodiments, the thermoplastic resin is used as the soft resin of the filling resin portion 41 and the hard resin of the molding resin portion 42. However, if the hardness relationship between the two can be obtained, the thermoplastic resin may be used. Good.

In each of the above embodiments, the example in which the filling resin portion 41 bulges from the opening at the end of the outer wall portion 31 and the outer surface is formed in an outward curved shape is described, but the present invention is not particularly limited. For example, the outer surface of the filling resin portion 41 may be formed in a planar shape, or may be formed in a concave shape.
In each of the above embodiments, a hexagonal hole is provided in the head 53 of the fixing screw 50, 80 so as to be rotatable with a hexagon wrench, but the head 53, 83 for making the fixing screw 50, 80 rotatable. The shape of the fitting portion with the provided tool is not limited at all. For example, a shape that can be rotated by a tool such as a vertical slit (slit, minus), a cross slit (plus), a star shape (hex lobe), etc. for a driver may be provided, and the fixing screws 50 and 80 can be rotated. If so, the tools and the heads 53 and 83 are not particularly limited.

L One side R The other side 10 Proximity sensor 11 Detecting section 11a Detecting surface 21 Detecting element 22 External code 23 Board 24 Fixing section 25 Connecting section 26 Recess 30 Case 30A Case body 31 Outer wall 31a Opposing wall 32 Substrate supporting section 33 End wall 34a One-side locking portion 34b Other-side locking portion 35 Projecting portion 35a Projecting portion opposing wall 35b Projecting portion connecting wall 35c Support surface 35d Through hole 36a Narrow width opposing wall 36b Projecting portion 37 Temporary fixing claw 38 Groove portion 41 Filling resin portion 42 Molded resin part 50 Fixed screw 51 Pressing surface 52 Rotating shaft 53 Head 54 Circumferentially inclined portion 70 Detected portion 71 Groove 72 Opening 74 Inner side surface 80 Fixed screw 81 Pressing surface 83 Head 83a Head main body 83b Locking piece 85 Deformed surface 85a Close position 85b Separate position 85c Gradual increase / decrease area

Claims (13)

In a proximity sensor having a detection unit in which a detection element is arranged on one side and an external code of the detection element extending from the other side,
A substrate on which the detection element is fixed on one side and the external code is connected on the other side;
A case that accommodates one side of the detection element and the substrate and protrudes the other side of the substrate,
A filling resin portion filled in the case and burying the detection element,
A molded resin portion embedded with the end portion of the external code and the other side of the substrate and integrally molded with the case,
A fixing screw attached to the molding resin portion,
A proximity sensor.   The proximity sensor according to claim 1, wherein the fixing screw is mounted at a position of the other end between the detection element and an end of the external cord.   The proximity sensor according to claim 1, wherein the molded resin portion is formed of a resin harder than the filled resin portion.   4. The proximity sensor according to claim 1, wherein the molded resin portion is formed of the same resin as the case or a resin having a higher heat deformation temperature than the case. 5. An end of the external code and the detection element are connected by wiring of the substrate,
5. The fixing screw according to claim 1, wherein the fixing screw is rotatably supported by the molding resin unit, and presses the detection unit against the detection target by pressing a surface opposite to a detection surface of the detection unit. Proximity sensor as described.   The proximity sensor according to claim 1, wherein the plurality of external cords are connected to different positions on one surface of the substrate. In the case, an outer wall portion opened to the detection surface side and a substrate support portion for positioning the substrate inside the outer wall portion are integrally formed,
The proximity sensor according to claim 1, wherein the filling resin portion is filled in the outer wall portion, and the movement of the filling resin portion to the other side is prevented by the substrate supporting portion.   The proximity sensor according to claim 7, wherein the molded resin portion is fixed to the substrate supporting portion.   9. The case according to claim 8, wherein the outer wall portion and the substrate support portion of the case are arranged in a direction intersecting with each other, and the substrate is arranged in a direction intersecting the outer wall portion and the substrate support portion. Proximity sensor.   The proximity sensor according to any one of claims 7 to 9, wherein the case has a protruding portion protruding from the substrate supporting portion, and the protruding portion has a supporting surface for a pressing surface of the fixing screw.   The proximity sensor according to claim 10, wherein the protrusion has a protrusion in a direction intersecting a longitudinal direction.   The proximity sensor according to any one of claims 1 to 11, wherein the case includes a case main body and a thin plate-like temporary fixing claw protruding from a side surface of the case main body. In a method of manufacturing a proximity sensor in which a detection element is embedded on one side and an external code of the detection element is extended from the other side,
Fixing the detection element on one side of the substrate,
One side of the detection element and the substrate is housed in a case, and the other side of the substrate is projected from the case,
Filling the case with a filling resin to bury one side of the detection element and the substrate,
A method of manufacturing a proximity sensor, comprising molding a molding resin integrally with the other side of the case, embedding an end of the external cord and the other side of the substrate, and mounting a fixing screw irremovably.

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