JP2012174654A - Attachment structure of coaxial connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a coaxial connector which can easily and securely increase strength of attachment to a housing.SOLUTION: A plurality of claw pieces 12 are projected in a peripheral dispersion arrangement from a peripheral edge of an attachment hole 11 of a housing 1 made of a metal plate, and bent obliquely to be tapered into the housing 1 respectively. An F type connector (coaxial connector) 2 has its base end 23 inserted into the attachment hole 11 from outside the housing 1 and then pressed in the tapered opening 13 having an inner wall surface formed of the respective claw pieces 12. Consequently, the base end 23 is held by the plurality of claw pieces 12 radially from outside, so the F type connector 2 is temporarily fixed to a side plate 10. The base end 23 of the F type connector 2 is caulked with a punch etc., to form a thickness deviation part 23a covered on the respective claw pieces 12 at an outer peripheral part of the base end 23, thereby integrating the base end 23 with the respective claw pieces 12.

Description

  The present invention relates to an attachment structure for a coaxial connector such as an F-type connector attached to a casing made of a metal plate.

  A coaxial connector represented by an F-type connector is attached to a housing of an electronic circuit unit (for example, a tuner unit) including a tuner capable of receiving a television broadcast signal or the like. This casing is formed into a box shape by bending a metal plate, and a coaxial connector is electrically connected to a circuit board housed inside the casing. The circuit board is provided with a high-frequency circuit including part or all of the tuner circuit, and the casing also functions to electromagnetically shield the high-frequency circuit. A mounting hole for a coaxial connector is formed in a side plate or the like of the housing, and a base end portion of an outer shell conductor (shell) of the coaxial connector passes through the mounting hole and is fixed by caulking to the housing. In addition, the front end portion of the outer shell conductor of the coaxial connector (a threaded portion in the case of an F-type connector) protrudes outward from the housing, and the cable connector (male connector) can be attached to and detached from this front end portion. .

  Between the front end portion and the base end portion of the outer shell conductor of the coaxial connector, a flange portion extending radially outward is projected, and a core wire connection conductor is incorporated on the inner side in the radial direction of the outer shell conductor. This core wire connection conductor is electrically connected to the high-frequency circuit in the housing. Then, by attaching the cable connector connected to the coaxial cable to the coaxial connector attached to the housing, the central conductor (core wire) and the outer conductor of the coaxial cable are connected to the connecting conductor for the core wire of the coaxial connector. The outer shell conductors are electrically connected to each other.

  As described above, since the cable connector is attached to and detached from the coaxial connector attached to the housing of the electronic circuit unit, it is necessary to ensure a required attachment strength when attaching the coaxial connector to the housing. Therefore, after inserting the base end portion of the coaxial connector (the base end portion of the outer shell conductor) into the mounting hole of the housing, the base end portion is pressurized with a punch or the like and crimped to the peripheral portion of the mounting hole of the housing. This mounting structure has been widely adopted.

  A conventional example of such a mounting structure will be described with reference to FIG. 6. As shown in FIG. 6, the F-type connector 6 is caulked and fixed to the peripheral portion of the mounting hole 51 formed in the side plate 50 of the housing 5. ing. The outer shell conductor of the F-type connector 6 is a screw portion 61 to which a cable connector (not shown) can be attached and detached from the front end to the front of the flange portion 62, and the base end portion 63 of the outer shell conductor has an attachment hole 51. It penetrates and projects inward of the housing 5. Then, the outer peripheral portion of the base end portion 63 is pressurized with a punch or the like to cause uneven thickness (buckling deformation), and the side plate 50 (peripheral portion of the mounting hole 51) is clamped by the uneven thickness portion 63a and the flange portion 62. Thus, the outer conductor of the F-type connector 6 is caulked and fixed to the housing 5. In FIG. 6, the core wire portion 64 led out from the core wire connection conductor (not shown) of the F-type connector 6 is electrically connected to a high frequency circuit (not shown) provided on the circuit board 7.

  However, in the above mounting structure, when a strong force is applied to the coaxial connector (F-type connector 6) when the cable connector is removed, for example, when a strong force is applied in the rotational direction, the coaxial connector is There was a risk of losing. For this reason, the mounting strength of the coaxial connector is usually increased by using soldering together, but it has been difficult to ensure sufficient reliability only by reinforcement by soldering.

  In view of this, a mounting structure has been proposed in which a plurality of notches are formed around the mounting hole of the housing so that the coaxial connector is not easily detached from the housing even when a strong force in the rotational direction is applied. (For example, refer to Patent Document 1). According to such a conventional mounting structure, the uneven thickness portion of the proximal end portion of the coaxial connector can be fitted into the notch provided around the mounting hole of the housing, so that the mounting strength is increased and the coaxial connector is mounted on the housing. It becomes difficult to come off.

JP-A-9-106863

  As described above, the conventional mounting structure disclosed in Patent Document 1 is mounted by fitting the uneven thickness portion of the base end portion (base end portion of the outer shell conductor) of the coaxial connector into the cut portion of the housing. Although the strength is increased, the base end portion of the outer shell conductor is caulked after being inserted into the mounting hole of the housing, so the mounting hole is formed to have a slightly larger diameter than the base end portion of the outer shell conductor. There is a need. In other words, a clearance is required between the housing mounting hole and the outer shell conductor in the radial direction, and the base end of the outer shell conductor is crimped while maintaining a uniform clearance over the entire circumference. Therefore, in such a conventional mounting structure, the uneven thickness portion of the base end portion of the outer shell conductor may not be sufficiently fitted into the cut portion of the casing at a location where the clearance is large. In that case, the coaxial connector has a wide circumferential range where the mounting strength is weak, so even if it can resist the rotational force, it has a strong pulling force when the cable connector is removed. When acting, the coaxial connector is easily detached from the housing.

  The present invention has been made in view of such a state of the art, and an object of the present invention is to provide a coaxial connector mounting structure capable of easily and reliably increasing the mounting strength of the housing.

  In order to achieve the above object, the present invention inserts the outer shell conductor of the coaxial connector into a mounting hole provided in a casing made of a metal plate, and pressurizes the base end portion of the outer shell conductor. In the coaxial connector mounting structure that is caulked and fixed to the casing by the plurality of claw pieces projectingly arranged in a circumferential direction around the mounting hole of the casing, and the claw pieces are attached to the casing. The base end portion of the outer shell conductor, which is bent obliquely so as to be tapered toward the inside, and press-fitted into the respective claw pieces, is crimped to the outer peripheral portion of the base end portion. An uneven thickness portion covering each nail piece was formed.

  In this way, a plurality of claw pieces protruding so as to be tapered toward the inside of the housing are provided at the periphery of the mounting hole of the housing made of a metal plate, and the base end portion of the coaxial connector is provided on each of the claw pieces. Since the base end of the outer shell conductor can be press-fitted, the base end of the coaxial connector held by these claw pieces can be temporarily fixed when the coaxial connector is inserted into the mounting hole of the housing. The subsequent caulking work can be performed efficiently. Also, in this caulking operation, the thickness of the outer peripheral portion of the base end of the coaxial connector is unevenly processed so as to cover each of the pawl pieces, so that each pawl piece is pressurized so as to be embedded in the outer peripheral portion of the base end portion. Is done. Therefore, each claw piece can be integrated with the base end portion of the coaxial connector, and the vicinity of the mounting hole of the housing including each claw piece is connected to the flange portion of the outer shell conductor and the uneven thickness portion of the base end portion. And can be pinched strongly.

  In the above mounting structure, when the mounting hole of the housing is substantially circular, and a plurality of claw pieces projecting at substantially equal intervals on the periphery of the mounting hole, the claw pieces arranged in a balanced manner are coaxial. Since the base end portion of the connector can be held (temporarily fixed) from the outside in the radial direction, the positional accuracy of the coaxial connector with respect to the mounting hole can be easily increased. Moreover, if the mounting hole is substantially circular, the shape of the base end portion of the coaxial connector may be a columnar shape, so that the processing cost can be reduced. In other words, when the mounting hole of the housing is non-circular, such as an oval shape, the coaxial connector must be secondarily processed according to the shape of the mounting hole, thus increasing the processing cost. Resulting in.

  In the coaxial connector mounting structure according to the present invention, a plurality of claw pieces protruding from the periphery of the mounting hole of the casing made of a metal plate are bent obliquely so as to be tapered toward the inside of the casing. Since the base end of the coaxial connector can be press-fitted into each claw piece, the base end of the coaxial connector held by each claw piece can be temporarily fixed when the coaxial connector is inserted into the mounting hole of the housing. The subsequent caulking work can be performed efficiently. Also, in this caulking operation, the thickness of the outer peripheral portion of the base end of the coaxial connector is unevenly processed so as to cover each of the pawl pieces, so that each pawl piece is pressurized so as to be embedded in the outer peripheral portion of the base end portion. Is done. As a result, the coaxial connector can be firmly attached to the vicinity of the mounting hole of the housing, and the required mounting strength that is difficult to come off from the housing is easy regardless of the axial, rotational, or radial force. And it will be surely obtained.

It is a fragmentary sectional view of the tuner unit which shows the attachment structure of the coaxial connector which concerns on the example of embodiment of this invention. It is a principal part enlarged view of FIG. It is a front view which shows the attachment hole for coaxial connectors established in the housing | casing of this tuner unit. It is explanatory drawing which shows the state just before inserting a coaxial connector in this attachment hole. It is explanatory drawing which shows the state which inserted and coaxially fixed the coaxial connector in this attachment hole. It is explanatory drawing which shows the attachment structure of the coaxial connector which concerns on a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of a tuner unit according to this embodiment. The tuner unit 100 is an electronic circuit unit including a tuner capable of receiving a television broadcast signal or the like, and an F-type connector 2 that is a coaxial connector is caulked and fixed to a side plate 10 of the housing 1. The housing 1 is formed into a box shape by bending a metal plate. A circuit board 3 electrically connected to the F-type connector 2 is accommodated in the housing 1, and a high-frequency circuit (not shown) including a part or all of the tuner circuit is contained in the circuit board 3. It is arranged. Note that the high-frequency circuit of the circuit board 3 is electromagnetically shielded because it is covered by the housing 1.

  A mounting hole 11 for the F-type connector 2 is formed in the side plate 10 of the housing 1, and a plurality of claw pieces 12 project from the periphery of the mounting hole 11 in a circumferentially distributed manner. As shown in FIG. 3, the attachment holes 11 are substantially circular, and the plurality of claw pieces 12 are dispersed in the circumferential direction at substantially equal intervals. Further, as shown in FIG. 4, each of the claw pieces 12 is obliquely bent so as to be tapered toward the inside of the housing 1, and each claw piece 12 is placed at the back of the mounting hole 11. A tapered opening 13 serving as an inner wall surface is defined. As will be described later, when the F-type connector 2 is attached to the side plate 10 of the housing 1, the base end portion 23 of the F-type connector 2 inserted through the attachment hole 11 is pressed to cause uneven thickness (buckling deformation). Thus, the base end portion 23 is caulked to each claw piece 12.

  In the F-type connector 2, a distal end portion 21 of an outer shell conductor (shell) 20 is a screw portion, and a cable connector (male connector) (not shown) can be attached to and detached from the distal end portion 21. The base end portion 23 of the outer shell conductor 20 is inserted into the mounting hole 11 of the housing 1, and the outer peripheral portion of the base end portion 23 is caulked to each claw piece 12 in the housing 1, whereby the F-type connector 2 is connected to the side plate. 10, the tip 21 protrudes outward from the housing 1. A flange portion 22 is provided between the distal end portion 21 and the base end portion 23 of the outer shell conductor 20 so as to project radially outward. When the F-type connector 2 is attached to the side plate 10, the flange portion 22 is attached to the attachment hole 11. It is press-contacted to the peripheral part. Further, a core wire connection conductor (not shown) is incorporated in the radially inner side of the outer shell conductor 20, and the core wire portion 24 led out from the core wire connection conductor is electrically connected to the high-frequency circuit in the housing 1. Connected. Then, by attaching the cable connector connected to a coaxial cable (not shown) to the F-type connector 2 attached to the housing 1, the central conductor (core wire) and the external conductor of the coaxial cable are connected to the F-type connector. The two core wire portions 24 and the outer shell conductor 20 are electrically connected to each other.

  As shown in FIG. 4, the diameter of the mounting hole 11 is R1, the minimum diameter of the tapered opening 13 with each claw piece 12 as the inner wall surface is R2, and the outer diameter of the base end 23 of the F-type connector 2 When R3 is R3, these magnitude relationships are set such that R1> R3> R2.

  Next, a procedure for attaching the F-type connector 2 to the side plate 10 of the housing 1 will be described. First, as shown in FIGS. 4 and 5, the base end portion 23 of the F-type connector 2 is inserted into the mounting hole 11 of the side plate 10 from the outside of the housing 1, and protrudes from the periphery of the mounting hole 11. The base end 23 is press-fitted into the opening 13 while the plurality of claw pieces 12 are expanded. Thereby, since the base end part 23 is hold | maintained at the some nail | claw piece 12 from a radial direction outer side, the F-type connector 2 will be in the state (state of FIG. 5) temporarily fixed to the side plate 10. FIG. Thereafter, the base end portion 23 of the F-type connector 2 is caulked with a punch or the like (not shown), so that the uneven thickness portions 23a covering the claws 12 are covered with the base end portion 23 as shown in FIGS. It is formed on the outer peripheral part. At that time, since each claw piece 12 is pressurized so as to be embedded in the outer peripheral portion of the base end portion 23, each claw piece 12 can be integrated with the base end portion 23. Further, the side plate 10 is in a state in which the peripheral edge portion of the attachment hole 11 and each claw piece 12 are strongly pressed by the flange portion 22 of the F-type connector 2 and the uneven thickness portion 23 a of the base end portion 23. Therefore, the F-type connector 2 can be firmly attached to the vicinity of the attachment hole 11 of the side plate 10, and the F-type connector 2 attached in this way can be applied with any force in the axial direction, rotational direction, or radial direction. Hard to come off from the housing 1.

  As described above, in the present embodiment example, the plurality of claw pieces 12 bent obliquely so as to be tapered toward the inside of the housing 1 are formed on the periphery of the mounting hole 11 of the housing 1. Each of the claw pieces protrudes from the circumferential end of the base end portion 23 by caulking the base end portion 23 of the F-type connector 2 press-fitted into the claw pieces 12. The uneven thickness part 23a which covers 12 is formed. Therefore, at the stage where the base end portion 23 of the F-type connector 2 is inserted into the mounting hole 11 of the housing 1, the base end portions 23 held by these claw pieces 12 can be temporarily fixed, and the subsequent caulking work Can be performed efficiently. In this caulking operation, the outer peripheral portion of the base end portion 23 of the F-type connector 2 is subjected to uneven thickness processing so as to cover each claw piece 12, and each claw piece 12 is embedded in the outer peripheral portion of the base end portion 23. Accordingly, the base end portion 23 and each claw piece 12 are integrated, and the vicinity of the mounting hole 11 of the housing 1 including each claw piece 12 is connected to the flange portion 22 of the outer shell conductor 20 and the base portion. Strong clamping can be performed by the uneven thickness portion 23 a of the end portion 23. Therefore, the F-type connector 2 can be firmly attached to the vicinity of the attachment hole 11 of the housing 1, and it is not necessary to be detached from the housing 1 regardless of any force in the axial direction, the rotational direction, or the radial direction. The mounting strength can be easily and reliably obtained.

  Further, in the present embodiment, a plurality of claw pieces 12 project from the peripheral edge of the substantially circular mounting hole 11 at a substantially equal interval in a balanced manner, and the base end portion of the F-type connector 2 is provided by these claw pieces 12. Since 23 can be held (temporarily fixed) from the outside in the radial direction, the positional accuracy of the F-type connector 2 with respect to the mounting hole 11 is easily improved. Moreover, since the mounting hole 11 is substantially circular, the shape of the base end 23 of the F-type connector 2 may be cylindrical, and secondary processing of the base end 23 required when the mounting hole 11 is non-circular can be omitted. Accordingly, the processing cost of the F-type connector 2 can be reduced.

  However, in order to enhance the anti-rotation effect of the F-type connector 2 with respect to the housing 1, the attachment hole 11 and the base end portion 23 may be formed in a non-circular shape such as an oval shape. If a plurality of claw pieces 12 are provided in a projecting manner, and each claw piece 12 is bent obliquely so as to be tapered toward the inside of the housing 1, the mounting strength of the F-type connector 2 is greatly increased. be able to.

  Further, in the above embodiment example, the case where the F-type connector 2 is attached to the housing 1 has been described. However, even if it is a coaxial connector of the type in which the tip portion 21 of the outer conductor 20 is not provided with a thread groove, It goes without saying that the same effects as those of the above embodiment can be obtained by applying the present invention.

1 Housing 2 F-type connector (coaxial connector)
3 Circuit board 10 Side plate 11 Mounting hole 12 Claw piece 13 Opening part 20 Outer shell conductor 21 Tip part (screw part)
22 collar part 23 base end part 23a uneven thickness part 24 core wire part

Claims (2)

Installation of a coaxial connector that is caulked and fixed to the casing by inserting the outer shell conductor of the coaxial connector into a mounting hole formed in the casing made of a metal plate and pressurizing the base end of the outer shell conductor Structure,
A plurality of claw pieces are provided in a circumferentially distributed arrangement on the periphery of the mounting hole of the housing, and the claw pieces are bent obliquely so as to be tapered toward the inside of the housing. By crimping the base end portion of the outer shell conductor press-fitted into each claw piece, an uneven thickness portion that covers each claw piece is formed on the outer peripheral portion of the base end portion. A coaxial connector mounting structure characterized by that.   2. The coaxial connector mounting structure according to claim 1, wherein the mounting hole is substantially circular, and a plurality of the claw pieces project from the peripheral edge of the mounting hole at substantially equal intervals.

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