JP2008176966A - Contact device - Google Patents

Abstract

In a contact device using a zigzag thin leaf spring, a lateral displacement during spring compression and an inclination of an end portion on a contact portion side are reduced to ensure stable conduction.
A base part, a zigzag thin leaf spring 14 in which one end is fixed to the base part and a plurality of flat plate parts 2 made of conductors and bent parts 3 and 4 are alternately connected, and a zigzag thin plate spring 14 are urged by the zigzag thin plate spring 14 In a contact device comprising a contact portion of a conductor pressed against a mating conductor and conducting contact conduction with the mating conductor via the abutting portion, the bent portion 3 on the base portion side and the abutting portion side of the zigzag thin plate spring 14 The bending portion 3 on the base portion side of the zigzag thin plate spring 14 and the bending portion 23 on the abutting portion side of the zigzag thin plate spring 14 are referred to as a zigzag spring nominal outline 6, 7 to the center line 5 side.
[Selection] Figure 3

Description

  The present invention relates to a contact device having a configuration in which a zigzag thin leaf spring is pressed against a mating conductor. More specifically, the present invention relates to a contact device that conducts with an in-vehicle device.

  A part of the in-vehicle equipment is pre-assembled on the vehicle body side, the other part is incorporated in the in-vehicle parts, and the parts are assembled to the car body to assemble the in-vehicle equipment. There is something to be done. An example is an antenna device for a rear window of a vehicle. An example of such a glass antenna for a vehicle is shown in FIGS.

  The antenna element 52 of the vehicle window antenna 50 is attached to the vehicle compartment side of the rear window glass 54 of the vehicle 1 by printing or the like. One end of each antenna element 52 extends to the overlap portion H of the vehicle roof panel (vehicle body) 56 and the rear window glass 54. A support base 58 that supports a processing circuit such as an amplifier for processing a signal received by the antenna element 52 is fixed to the roof panel 56 with, for example, a bolt. Note that a cover or the like (not shown) is attached to the overlapped portion H so that it cannot be seen from the outside.

  The vehicle window antenna 50 having such a configuration is assembled as follows. First, a support base 58 that supports an amplifier or the like is attached to the roof panel 56, then the rear window glass 54 is placed at a predetermined position, and the antenna element 52 is configured by printing on the rear window glass 54. The end contact 52a (mating conductor) and the signal processing circuit attached to the support base 58 are electrically connected, and the rear window glass 54 is fixed at a predetermined position, thereby completing the antenna device. However, since the end contact 52a of the antenna element 52 and the support base 58 are installed in a very narrow space, it is difficult to wire individually and the number of contacts is large, so each contact is a connector. It will take time and labor to assemble them. Therefore, a contact device 100 using a thin plate spring as shown in FIG. 13A is used in order to conduct such a portion (see, for example, Patent Document 1).

  A contact device 100 shown in FIG. 13A includes a base portion 12, a zigzag thin plate spring 14 of a conductor, a contact portion 60, and a movement 18. The contact device 100 is fixed to a support base base 58 attached to the roof panel 56, and the terminal portion 20 is electrically connected to a signal processing circuit of the support base base 58. Then, as described above, when the rear window glass 54 is placed at a predetermined position, the end contact 52a of the antenna element 52 that becomes the counterpart conductor comes into contact with the contact portion 60 of the contact device 100, and the rear window glass 54 Is fixed at a predetermined position, the zigzag thin leaf spring 14 of the contact device 100 is compressed, and conduction between the end contact 52a of the antenna element 52 serving as the counterpart conductor and the contact portion 60 of the contact device 100 is ensured. The According to such a contact device 100, the end contacts 52a of many glass antennas can be brought into conduction with the signal processing circuit of the support base 58 at the same time as the rear window glass 54 is assembled. It becomes possible and the assembly process can be simplified.

  In addition to the zigzag thin plate spring 14 shown in FIG. 13 (a), in a contact device that ensures conduction by contact with a spring, when a large stroke is not required, the S-shaped thin plate spring shown in FIG. A U-shaped thin plate spring shown in FIG. 16 is used (see, for example, Patent Document 2).

JP 2005-332643 A JP 2003-45521 A

  However, the zigzag thin leaf spring used in such a contact device undergoes a lateral displacement in a direction perpendicular to the compression deformation when subjected to compression, which may make the contact conduction unstable. Hereinafter, this point will be described. As shown in FIG. 13 (b), the zigzag thin leaf spring 14 used in such a contact device 100 has a shape in which the bent portions 3, 4a, 4b and the flat plate portion 2 are alternately connected, and the base portion side. The end portion 10 is fixed to the base portion 12, and the contact portion side end portion 11 is in contact with the contact portion 60. The bent portion 4 has the same shape, and the length of the intermediate flat plate portion 2 is also the same. In a state where no load is applied, the outer sides of the bent portions 3 and 4 of the spring are shaped so as to be in contact with the nominal outlines 6a and 7a which are parallel to the center line 5 of the spring and are in a symmetrical position.

The dimensions of each part of the zigzag thin leaf spring 14 and the state of deformation are shown in FIG. In FIG. 14, the number of times the spring is bent is 4 for the sake of explanation, the no-load state is indicated by a solid line, and the deformation state due to the compressive load is indicated by a broken line. The spring constant k ₁₁ of the thin plate spring constituted by the first bent portion 3 on the lowermost base side and the flat plate portion 2a connected to the first bent portion 3 is as follows, assuming that the Young's modulus of the thin plate spring is E ₁ and the secondary moment of inertia is I ₁ . It is expressed as
k ₁₁ = (E ₁ × I ₁ ) / Λ ₁₁ −−−−−− (Equation 1)
Here, Λ ₁₁ is a second moment used in the spring calculation, and the shape factor of the spring bent portion is determined by the length of the flat plate portion L ₁ , the bending radius R ₁ of the spring bent portion, the bending angle θ _1, etc. Where Cm ₁₁ is expressed as follows.
^{_{Λ 11 = L 1 3 × Cm}} 11/3 ------ ( Equation 2)
Further, the spring constant k ₁₂ of the thin leaf spring intermediate portion constituted by the second bent portion 4 and the flat plate portion 2b connected thereto in the same manner as described above, the Young's modulus of the thin plate spring E _2, the moment of inertia I ₂ Is expressed as follows.
k ₁₂ = (E ₂ × I ₂ ) / Λ ₁₂ −−−−−− (Formula 3)
Here, Λ ₁₂ is a second moment used for the spring calculation, and the shape factor of the spring bent portion determined by the length of the flat plate portion L ₂ , the bending radius R ₂ of the spring bent portion, the bending angle θ _2, etc. Where Cm ₁₂ is expressed as follows.
^{_{Λ 12 = L 2 3 × Cm}} 12/3 ------ ( Equation 4)
Usually, the material of the thin leaf spring is the same, the strip width, since it is also the plate thickness constant is _{E 1 = E 2, I 1} = I 2, in the shape shown in FIG. _{13 (b), L 1 =} L because it is _2, spring constant of the bending portion 3, 4 is determined by the shape factor Cm ₁₁ and Cm ₁₂ of the spring bend. In the case of the zigzag thin leaf spring used in the conventional contact device shown in FIG.
Since Cm ₁₁ > Cm ₁₂ , Λ ₁₁ > Λ ₁₂ and
k ₁₁ <k ₁₂
It becomes. This means that the thin plate spring composed of the first bent portion 3 and the flat plate portion 2a connected thereto is softer and more flexible than the intermediate thin plate spring formed of the second bent portion 4a and the flat plate portion 2b connected thereto. Accordingly, the rotational angular displacement Δθ ₁ around the first bent portion 3 when a load is applied is larger than the rotational angular displacement Δθ ₂ around the second bent portion 4a. Further, the lateral displacement (rightward in FIG. 14) of the second bent portion 4a due to the deformation of the first bent portion 3 and the flat plate portion 2a connected to the first bent portion 3 is the same as that of the second bent portion 4a and the flat plate portion 2b connected thereto. It becomes larger than the lateral displacement of the third bent portion 4b due to the deformation. As a result, the zigzag thin leaf spring 14 is deformed such that when it receives a compressive load, it tilts to the right by an angle δ _{1 and} laterally displaces by ε ₂ as a whole as shown by the broken line in FIG.

Further, the spring constant k ₁₃ of the flat springs formed by the abutment portion end 11 is a flat plate portion and the uppermost part of the bent portion 23 of the abutment side connected thereto, E ₃ the Young's modulus of the thin plate spring, Assuming that the moment of inertia of the cross section is I ₃ , it is expressed as follows.
k ₁₃ = (E ₃ × I ₃ ) / Λ ₁₃ −−−−−− (Formula 5)
Here, Λ ₁₃ is a second moment used in the spring calculation, and the shape factor of the spring bent portion determined by the length L ₅ of the flat plate portion, the bending radius R ₃ of the spring bent portion, the bending angle θ _{3 and the} like. Cm ₁₃ is expressed as follows.
^{_{Λ 13 = L 5 3 × Cm}} 13/3 ------ ( Equation 6)

Since Cm ₁₃ > Cm ₁₂ as in the base portion side and the second bent portion described above, Λ ₁₃ > Λ ₁₂ ,
k ₁₃ <k ₁₂
It becomes. This is because the thin plate spring composed of the bent portion 23 on the contact portion side and the contact portion side end portion 11 of the flat plate connected to the bent portion 23 is connected to the second bent portion 4a and the flat plate portion 2b connected thereto. It is softer and easier to bend than the thin leaf spring in the middle. Therefore, when a load is applied, the tip on the left side of the contact portion side end 11 in FIG. 14 is displaced more than the bent portion 23 side on the right side of the contact portion side end portion 11 in FIG. The contact-side end 11 is inclined by the rotational angular displacement Δθ ₃ . Then, the contact part 60 attached to the contact part side end part 11 is inclined, and the contact part 60 comes into contact with the end contact 52a which is the counterpart conductor.

  Due to the deformation characteristics of the zigzag thin leaf spring described above, the rear window glass 54 is placed at a predetermined position in the assembly process of the vehicle window antenna 50 described above, and the end contact 52a of the antenna element 52 is connected to the contact device 100. When the contact device 100 is pressed and the zigzag thin plate spring 14 of the contact device 100 is compressed and fixed at a predetermined position, the zigzag thin plate spring 14 of the contact device 100 is laterally displaced and tilted. As a result, the contact portion 60 of the contact device also shifts and tilts, and the conduction with the end contact 52a of the antenna element 52 becomes unstable. Further, when the amount of movement in the lateral direction is increased, the contact portion 60 of the contact device is disengaged from the end contact 52a of the antenna element 52 due to the lateral displacement, and the area of the end contact 52a or the contact portion 60 is reduced. There is a problem that it is necessary to increase the area, and the apparatus becomes large. Further, since the end contact 52a of the antenna element 52 and the contact portion 60 of the contact device are in contact with each other and cause lateral displacement, rubbing occurs between the end contact 52a and the contact portion 60, causing a conduction failure. There was a problem of becoming. In particular, since the end contact 52a is formed by printing on the rear window glass 54 and the thickness thereof is very thin, there is a problem that the contact portion is easily damaged by rubbing and leads to poor conduction.

  Further, during traveling, the relative distance between the end contact 52a of the antenna element 52 and the contact portion 60 changes due to the vibration of the vehicle, and the compression force applied to the zigzag thin plate spring 14 changes due to the change in the relative distance. To do. As described above, the zigzag thin leaf spring 14 is compressed and deformed in the axial direction when a compressive force is applied, and is also deformed in the lateral direction and deformed in the abutting portion side end 11. Therefore, when the compressive force is changed, the amount of deformation in the axial direction is changed, and the amount of movement in the lateral direction and the inclination of the contact portion side end portion 11 are also changed. For this reason, a lateral rubbing vibration is generated between the contact portion 60 and the end contact 52a due to the vibration of the vehicle, and the rate of change in the contact resistance value between the contact portion 60 and the end contact 52a is increased. As a result, there was a problem of causing radio noise. In addition, due to a change in compressive force due to the vibration of the vehicle, a tilt vibration of the abutting portion side end portion 11 occurs simultaneously with a lateral vibration of the abutting portion 60, thereby changing the electrical connection area with the end contact 52a. Also, there was a problem that the resistance change rate increased and radio noise was generated. Furthermore, there is a problem that the contact portion 60 causes the end contact 52a to be damaged when the vibration in the lateral direction and the inclination is increased.

  The U-shaped thin plate spring shown in FIG. 16 is also similar in that the contact portion of the contact device using the thin plate spring causes a lateral movement by compression. In FIG. 16, the contact 122a is moved by W in the horizontal direction. FIG. 15 shows an S-shaped U-shaped thin plate spring to solve the problem of the lateral movement of the contact. The whole spring is tilted to the left and horizontally moved by W1. This offsets the lateral movement W2 in the right direction and minimizes the lateral displacement of the contact 112a. However, this S-shaped thin leaf spring tilts the entire spring to cancel lateral displacement, and is applied to a zigzag thin leaf spring that requires a large number of necessary strokes and bends and in which the inclination and lateral displacement of the spring itself are problematic. That's not true. Therefore, in the zigzag thin plate spring, the problems of unstable contact conduction caused by the lateral displacement and inclination of the spring, enlargement of the contact area, and poor conduction due to rubbing have not been solved.

  It is an object of the present invention to provide a contact device that can reduce a lateral displacement and a tilt of a contact portion side end portion when a spring is compressed in a zigzag thin plate spring and can ensure stable conduction.

  The contact device according to the present invention includes a base portion, a zigzag thin plate spring having one end fixed to the base portion, and a plurality of flat plate portions made of conductors and bent portions alternately connected to each other and biased by the zigzag thin plate spring. A contact device of a conductor pressed against the side conductor and conducting contact conduction with the counterpart conductor via the contact portion, wherein the spring constant of the bent portion on the base portion side of the zigzag thin plate spring And the spring constant of the bent part on the contact part side is made larger than the spring constant of the other bent parts.

  The contact device of the present invention includes a base part, a zigzag thin plate spring whose one end is fixed to the base part, and a plurality of flat plate parts made of conductors and bent parts are alternately connected to each other, and is biased by the zigzag thin plate spring. A contact device for conducting contact with the mating conductor via the contact portion, the outer shape of the zigzag thin leaf spring on the base portion side and the contact portion side. The outer shape is offset inward from the nominal contour line of the zigzag spring.

  In the contact device of the present invention, the flat plate portion length between the bent portions on the base portion side of the zigzag thin leaf spring and the flat plate portion length between the bent portions on the contact portion side are shorter than other flat plate portion lengths. The width of the bent portion and the flat plate portion of the zigzag thin plate spring and the width of the bent portion and the flat plate portion of the contact portion side are larger than the width of the other bent portions and the flat plate portion. The zigzag thin plate spring has a bent portion on the base portion side and the plate thickness of the flat plate portion, and the bent portion on the abutment portion side and the plate thickness of the flat plate portion have other bent portions. It is also preferable that the thickness is larger than the plate thickness of the flat plate portion, and the bending portion bending radius on the base portion side and the bending portion bending radius on the abutting portion side of the zigzag thin leaf spring are the same as those of other bending portions. It is also suitable as being smaller than the bending radius, and the zigzag thin leaf spring abuts The flat plate portion of the side is inclined toward the mating conductor, it is also preferable.

  The contact device according to the present invention includes a base portion, a zigzag thin plate spring having one end fixed to the base portion, and a plurality of flat plate portions made of conductors and bent portions alternately connected to each other and biased by the zigzag thin plate spring. A contact device of a conductor pressed against the side conductor and conducting contact conduction with the counterpart conductor via the contact portion, wherein the spring constant of the bent portion on the base portion side of the zigzag thin plate spring Is larger than the spring constant of the other bent portion, and the flat plate portion on the contact portion side of the zigzag thin plate spring is inclined toward the mating conductor.

  The contact device according to the present invention includes a base portion, a zigzag thin plate spring having one end fixed to the base portion, and a plurality of flat plate portions made of conductors and bent portions alternately connected to each other and biased by the zigzag thin plate spring. A contact device for conducting contact with the mating conductor via the contact portion, wherein the outer shape of the zigzag thin plate spring on the base portion side is the zigzag spring. The flat plate portion on the contact portion side of the zigzag thin leaf spring is inclined toward the mating conductor.

  In the contact device according to the present invention, the length of the flat plate portion between the bent portions on the base portion side of the zigzag thin plate spring is preferably shorter than the length of the other flat plate portion, and the base portion of the zigzag thin plate spring It is also preferable that the plate width of the bent portion on the side and the flat plate portion is larger than the plate width of the other bent portion and the flat plate portion, and the bent portion and the flat plate portion on the base portion side of the zigzag thin plate spring It is also preferable that the plate thickness of the bent portion and the flat plate portion is larger than the thickness of the bent portion, and the bent portion bending radius on the base portion side of the zigzag thin leaf spring is the bent portion of the other bent portion. It is also preferable that it is smaller than the radius.

  The present invention has an effect that in a zigzag thin leaf spring, the lateral displacement during spring compression and the inclination of the end portion on the contact portion side can be reduced to ensure stable conduction.

  Hereinafter, preferred embodiments of the zigzag thin leaf spring according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a first embodiment of a contact device according to the present invention, and FIG. 2 is a sectional view thereof. The contact device 9 shown in FIGS. 1 and 2 includes a base portion 12, a zigzag thin plate spring 14, a contact portion 28, a movement 18, and a terminal portion 20. The contact device 9 is fixed to a support base base 58 attached to the roof panel 56 by a tap screw screwed into the bolt hole 12 a of the base portion 12, and the terminal portion 20 is signal processing attached to the support base base 58. There is continuity with the circuit. Then, the contact portion 28 comes into contact with the end contact 52 a of the antenna element 52, and the signal processing circuit attached to the support base 58 and the antenna element 52 are conducted. In addition, it is suitable for the base | substrate part 12 to be comprised with an insulating member (for example, nylon resin).

  The movement 18 is guided by a guide portion provided in the base portion 12 and can be moved toward and away from the antenna element 52 within a predetermined section. As shown in FIG. 2, the base portion 12 is provided with a guide hole 34 as a guide portion. The guide hole 34 has an opening on the antenna element 52 side, and is provided as a bottomed hole extending in a direction substantially perpendicular to the installation surface of the support base base 58. Further, the cross section has a substantially elongated hole shape. There is a predetermined gap between the outer wall of the movement 18 and the inner wall of the guide hole 34, and the movement 18 is guided by the guide hole 34 and can move freely in the vertical direction. An engaging claw 36 for preventing the movement 18 from dropping off is provided at the opening end of the guide hole 34. An engagement claw 38 is also provided on the base side of the movement 18. The uppermost position (top dead center) of the movement 18 is determined by the engagement of the engagement claws 36 and 38 (position shown in FIG. 2).

  Furthermore, the movement 18 is configured as a cylindrical member having an upper bottom wall and a side wall. The contact portion 28 is fitted into a through hole 40 as a window provided in the upper bottom wall with a gap, and the contact portion 28 is exposed to the antenna element 52 side. With such a configuration, the contact portion 28 can freely move in the vertical direction with respect to the movement 18.

  The zigzag thin plate spring 14 is fixed to the base portion 12 by the positioning hole 10 a of the base portion side end portion 10 being fitted into the base portion 12. The abutting portion side end portion 11 is provided with a convex portion 11a, and the convex portion 11a is fitted into a concave portion 28a provided on the lower surface of the abutting portion 28, whereby the zigzag thin plate spring 14 and the abutting portion 28 are zigzag thin plate. The spring 14 is configured to move in conjunction with the compression direction and the vertical direction (horizontal direction). The contact portion 28 is urged toward the antenna element 52 by the zigzag thin plate spring 14 (that is, upward) and is pressed against the end contact 52 a of the antenna element 52. The contact portion 28 has a substantially planar contact surface that contacts the end contact 52 a of the antenna element 52. Since the zigzag thin plate spring 14 urges the contact portion 28 and conducts electricity, the zigzag thin plate spring 14 is constituted by a metal thin plate that is an elastic body and also a conductor. Further, the abutting portion 28 is constituted by a conductive rubber or the like which is an elastic body and a conductor so as to maintain contact while ensuring conduction between the zigzag thin plate spring 14 and the end contact 52a of the antenna element 52 which is the counterpart conductor. It is preferable to do.

  The zigzag thin leaf spring 14 is configured to be shorter than the free length in the state of FIG. 2, that is, in a state where the movement 18 is in the uppermost position. When the contact portion 28 is in contact with the end contact 52a of the antenna element 52, the contact portion 28 is pushed downward and generates a biasing force in the direction in which the zigzag thin leaf spring 14 extends. The distance between the lower surface of the part 12 and the end contact 52a of the antenna element 52 and the dimensions of each part of the contact device 9 are determined.

  Next, the configuration of the zigzag thin leaf spring 14 used in the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a front view of the zigzag thin leaf spring, and FIG. 4 is a perspective view.

As shown in FIG. 3, the zigzag thin leaf spring 14 has a shape in which the bent portions 3, 4 and the flat plate portion 2 are alternately connected. As described above, the base portion side end portion 10 is fixed to the base portion 12, and the contact portion side end portion 11 is in contact with the contact portion 28. The bent portion 4 has the same shape, and the length of the intermediate flat plate portion 2 is also the same. In the state where no load is applied, the outer sides of the spring bent portions 4 on both sides are respectively on one straight line. The straight lines connecting the outsides of the spring bent parts 4 are called zigzag spring nominal outlines 6 and 7. The outer side of the bent portion 3 on the lowermost base portion side is offset toward the center line 5 from the nominal outline 6, and the outer side of the bent portion 23 on the uppermost contact portion side is the nominal outline 7. Is offset toward the center line 5. Further, the length L ₃ of the flat plate portion 2 a connected to the bent portion 3 on the base portion side is shorter than the length L ₂ of the flat plate portion ₂ b connected to the second bent portion 4 a, and the flat plate portion connected to the uppermost bent portion 23. The length L _{5 of the} contact portion side end portion 11 is also shorter than the length L ₂ of the flat plate portion 2b connected to the bent portion 4a. A terminal portion 20 connected to a signal processing circuit attached to the support base 58 is bent at the base portion side end portion 10 of the zigzag thin leaf spring.

FIG. 5 shows a state of deformation when a compressive load is applied to the zigzag thin leaf spring 14 having such a shape. In the zigzag thin plate spring 14 according to the first embodiment, the spring constants of bending around the bent portion 3 on the base portion side and the thin plate spring on the second bent portion 4a and the bent portion 23 on the contact portion side, k ₁ , k ₂ and k ₃ are the Young's moduli of the thin leaf springs E ₁ , E ₂ , E ₃ , the secondary moments of the I ₁ , I ₂ , and I ₃ plate portions are the lengths of the L ₃ , L ₂ , and L ₅ springs, respectively. The shape factor of the part is expressed as follows with Cm ₁₁ , Cm ₁₂ , and Cm ₁₃ .
k ₁ = (E ₁ × I ₁ ) / Λ ₁ −−−−−− (Equation 7)
^{_{Λ 1 = L 3 3 × Cm}} 11/3 ------ ( Equation 8)
k ₂ = (E ₂ × I ₂ ) / Λ ₂ −−−−−− (Equation 9)
^{_{Λ 2 = L 2 3 × Cm}} 12/3 ------ ( Formula 10)
k ₃ = (E ₃ × I ₃ ) / Λ ₃ −−−−−− (Equation 11)
^{_{Λ 3 = L 5 3 × Cm}} 13/3 ------ ( Formula 12)
Since the material of the zigzag thin leaf spring 14 is the same, and the plate width and plate thickness are also constant, E ₁ = E ₂ = E ₃ and I ₁ = I ₂ = I ₃ . The spring constants k ₁ , k ₂ , k ₃ of the bent portions ₃ , 4 a, 23 are the shape factors Cm ₁₁ , Cm ₁₂ , Cm ₁₃ of the spring bent portions and the lengths L ₃ , L ₂ , L ₅ thus be determined. In this embodiment, Cm ₁₁ > Cm ₁₂ , but the length L ₃ of the flat plate portion 2a connected to the first bent portion 3 is shorter than the flat plate portion length L ₂ connected to the second bent portion 4a. Therefore, due to the effect, Λ ₁ > Λ ₂ and k ₁ > k ₂ , and the spring constant k ₁ around the first bent portion 3 on the base portion side is the spring constant k around the second bent portion 4a. _It is larger than ₂ .

Further, in this embodiment, the bent portion 23 on the uppermost contact portion side is also offset to the center line 5 side, and the length of the contact portion side end portion 11 connected to the bent portion 23 on the uppermost contact portion side. Since L ₅ is shorter than the length L _{2 of the} flat plate connected to the second bent portion 4a, the effect results in Λ ₃ > Λ ₂ , k ₃ > k ₂ , and the uppermost bent portion 23 The spring constant k ₃ around is larger than the spring constant k ₂ around the second bent portion 4ab.

As a result of calculating in detail by computer structural analysis, the bending spring constant k ₁ around the bent portion 3 on the base portion side, the bending k ₂ around the second bent portion 4a, and the deformation of the zigzag thin leaf spring 14 are calculated. _{When 1} is larger than k ₂ and satisfies a certain relationship, as shown in FIG. 5, the horizontal displacement ε _{3 in} the right direction of the second bent portion 4a and the left of the third bent portion 4b It was found that the horizontal displacement ε _{4 in the} direction becomes substantially equal, the zigzag thin leaf spring 14 does not cause displacement in the direction perpendicular to the compression direction (horizontal direction), and ε ₅ becomes almost zero and is compressed substantially vertically. When the number of times of bending is six as in the first embodiment of the present invention, the lateral displacement of the zigzag thin leaf spring 14 is substantially achieved when k ₁ and k ₂ are in the relationship of the following equation (13). Can be eliminated. Further, when k ₁ = 2.3 × k ₂ , the lateral displacement can be almost eliminated.
2.2 × k ₂ <k ₁ <2.4 × k ₂ ------ (Formula 13)
In the zigzag thin leaf spring as shown in the first embodiment, since the material is uniform and a plate having a uniform thickness and width is bent, the Young's moduli E ₁ and E ₂ are the same, Since the cross-sectional secondary moments I ₁ and I _{2 of the} thin plate are also the same, the length of the flat plate portion 2 a connected to the first bent portion 3 by offsetting the first bent portion 3 from the outline 6 to the center line side 5. the is L _3, arranged to increase the k ₁ by less than the length L ₂ of the flat plate portion 2b leading to the second bent portion 4a, k ₁ and k ₂ is in the range mentioned above of the formula 13 is doing.

On the other hand, the spring constant k ₃ around the uppermost bent portion 23 is configured to be larger than the spring constant k ₂ around the second bent portion 4a. In FIG. 5, the tip on the left side of the abutting portion side end 11 has a rotational angular displacement Δθ ₃ so as to be substantially the same displacement as the bent portion 23 side on the right side of the abutting portion side end 11 in FIG. The rotation-displacement causes the contact portion side end portion 11 to be compressed along the center line 5 while maintaining the original direction.

Thus, in this embodiment, the zigzag thin leaf spring 14 is set by making the spring constant k ₁ around the bent portion 3 on the base portion side larger than the spring constant k ₂ around the second and third bent portions. The lateral displacement of the uppermost bent portion 23 is reduced, and the spring constant k ₃ around the uppermost bent portion 23 is made larger than the spring constant k ₂ around the second and third bent portions. The inclination of the end portion 11 can be reduced.

  The contact device 9 of this embodiment can simultaneously reduce the lateral displacement of the spring and the inclination of the uppermost contact portion side end portion 11 even when the zigzag thin leaf spring 14 is compressed by the contact portion 28. Thus, the lateral displacement and inclination of the zigzag thin leaf spring 14 during compression can be reduced, and stable conduction can be ensured. Accordingly, in the assembly process of the vehicle window antenna 50, the contact portion 28 of the contact device 9 can also reduce the conduction failure due to the lateral displacement and the conduction failure due to the occurrence of the damage of the end contact 52a due to the rubbing. There is an effect that secure conduction can be secured.

  In addition, it is possible to reduce the generation of radio noise due to rubbing vibration between the contact portion 28 and the end contact 52a which is the counterpart conductor or inclination of the uppermost contact portion side end 11 due to the vibration of the vehicle. It can be in a conductive state. Furthermore, there is an effect that a compact device configuration can be achieved without increasing the area of the end contact 52a or the contact portion 28 which is the counterpart conductor.

A second embodiment will be described with reference to FIG. In the second embodiment, the same parts as those in the first embodiment are denoted by the same symbols, and the description thereof is omitted. FIG. 6 is a perspective view of the zigzag thin leaf spring 14 used in the contact device according to the second embodiment of the present invention. In the second embodiment, the width of the bent portion 3 on the base portion side and the flat plate portion 2a connected thereto is made wider than the second to fifth bent portions 4a to 4d and the flat plate portions 2b to 2d connected thereto. The width of the bent portion 23 on the upper contact portion side and the contact portion side end portion 11 which is a flat plate portion connected to the upper bent portion and the flat plate portion 2e is also the second to fifth bent portions 4a to 4d and the flat plate portion 2b connected thereto. It is wider than ~ 2d. As a result, as described in the compressive deformation of the first embodiment, the bending spring constant k ₁ around the bending portion 3 on the base portion side and the bending k around the second to fifth bending portions 4a to 4d. together so that within the scope of formula 13 to between ₂ and greater than around the spring constant k ₃ at the top of the bent portion 23 from the second fifth bent portion 4a~4d around the spring constant k ₂ It is comprised as follows.

  Similar to the first embodiment, the second embodiment configured as described above has the effect of reducing the lateral displacement during spring compression and the inclination of the abutting portion side end portion 11 and ensuring stable conduction.

In the third embodiment, the thickness of the bent portion 3 on the base portion side and the flat plate portion 2a connected thereto, the bent portion 23 on the contact portion side, and the contact portion side end portion 11 which is a flat plate portion connected thereto, By making the thickness of the flat plate portion 2e thicker than those of the second to fifth bent portions 4a to 4d and the flat plate portions 2b to 2d, the sectional secondary moment I ₁ of the bent portion 3 on the base portion side is increased, and k ₁ And k ₂ are within the range of the above equation 13, and the spring constant k around the uppermost bent portion 23 is increased by increasing the cross-sectional secondary moment I ₃ around the bent portion 23 on the abutting portion side. ₃ is configured to be larger than the spring constant k ₂ around the second to fifth bent portions 4a to 4d.

In the fourth embodiment, since the shape factors Cm ₁₁ , Cm ₁₂ , and Cm ₁₃ of the spring bent portion become smaller as the bending radius becomes smaller, the bending radius R ₁ of the bent portion 3 on the base portion side is set to from 2 to less than the bending radius R ₂ of the fifth bent portion 4 a to 4 d, with k ₁ and k ₂ are set in a range of the above equation 13, the bending of the contact portion of the side bent portion 23 The radius R ₃ is also made smaller than the bending radius R ₂ of the second to fifth bent portions 4a to 4d, and the spring constant k ₃ around the uppermost bent portion 23 is changed to the second to fifth bent portions 4a to 4a. It is configured to be larger than the spring constant k ₂ around 4d.

  Such 3rd, 4th embodiment has an effect that the horizontal direction displacement at the time of spring compression and the inclination of contact part side end 11 can be reduced, and stable conduction can be secured like the 1st embodiment. .

A fifth embodiment will be described with reference to FIG. In the fifth embodiment, parts similar to those in the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted. In the fifth embodiment, the notches 15 are provided in the bent portions 4a to 4d other than the bent portion 3 on the base portion side and the bent portion 23 on the contact portion side to reduce the rigidity of the bent portions 4a to 4d. constituting part spring constant k ₁ of the bent portion 23 around the bent portion 3 around and abutting side of the side, k ₃ as relatively larger than the other bent portion 4a~4d around the spring constant k ₂ and ing. The notch 15 may be formed by forming a through hole in the spring plate before bending and bending the zigzag thin plate spring 14. As a result, similar to the first embodiment, the lateral displacement during spring compression and the inclination of the abutting portion side end portion 11 are reduced, and stable conduction can be ensured.

A sixth embodiment will be described with reference to FIGS. In the sixth embodiment, the same reference numerals are given to the same parts as those of the previously described embodiments, and the description thereof is omitted. As shown in FIGS. 8 and 9, in the sixth embodiment, the base portion side is offset by offsetting the bent portion 3 on the base portion side from the nominal outline 6 of the zigzag thin leaf spring 14 toward the center line 5 side. The structure in which the spring constant k ₁ around the bent portion 3 is made larger than the spring constant k ₂ around the other bent portions 4a to 4d to reduce the lateral displacement of the zigzag thin leaf spring 14 is the first embodiment. The bent portion 23 on the contact portion side at the uppermost portion is not offset toward the center line 5 side, and the contact portion side end portion 11 is placed on the side of the end contact 52a that is the counterpart conductor. The structure is inclined toward the front. The inclination angle is Δθ ₉ from the direction perpendicular to the center line 5. The inclination angle Δθ ₉ is an angle equivalent to the rotational angular displacement caused by the compressive force when the zigzag thin leaf spring 14 is assembled.

A deformation when the zigzag thin leaf spring 14 of the present embodiment is compressed will be described with reference to FIG. As described in the first embodiment, the spring constant k ₁ around the bent portion 3 on the base portion side is made larger than the spring constant k ₂ around the other bent portions 4a and 4b, so that the zigzag thin plate spring 14 is The lateral displacement is reduced. Since the bent portion 23 on the uppermost contact portion side is not offset to the center line 5 side, the spring constant k ₃ around the bent portion 23 is smaller than the spring constant k ₂ around the second bent portion 4a. It has become. The thin plate spring composed of the bent portion 23 on the contact portion side and the contact portion side end portion 11 connected thereto is softer and more flexible than the thin plate spring formed of the second bent portion 4a and the flat plate portion 2b connected thereto. It will be. Therefore, when a compressive load is applied to the zigzag thin leaf spring 14, the tip on the left side of the contact portion side end portion 11 in FIG. 10 is the bent portion on the right side of the contact portion side end portion 11 in FIG. The contact portion side end portion 11 is not compressed along the center line 5 while maintaining the original direction, and is compressed and tilted. Therefore, in the present embodiment, the contact portion side end portion 11 is inclined in advance toward the end contact point 52a, which is the counterpart conductor, by a rotational angular displacement Δθ _{9 of} the contact portion side end portion 11 to obtain a predetermined compression. When a load is applied, the contact portion side end portion 11 is configured to be parallel to the surface of the end contact 52a which is a counterpart conductor.

  With this configuration, when the zigzag thin leaf spring 14 is attached with a predetermined compressive force, the contact portion side end portion 11 and the end contact point 52a against which the contact portion 28 is pressed are substantially parallel to each other. Can be. Accordingly, the front end side on the left side of the contact portion side end portion 11 in FIG. 10 and the bent portion 23 side on the right side of the contact portion side end portion 11 in FIG. Can be pressed against the end contact 52a. Even when the compression load fluctuates due to the vibration of the vehicle, the abutting portion side end portion 11 can keep the abutting portion 28 pressed substantially evenly, and the abutting portion 28 is maintained at the end contact 52a. Can be reduced.

  In the present embodiment, the bent portion 3 on the base portion side is configured to be offset to the center line 5 side so as to reduce the lateral displacement due to the compressive force of the zigzag thin leaf spring 14 as in the first embodiment. Yes. For this reason, when the compression load is not applied as described above, the contact portion side end portion 11 is inclined toward the mating conductor so that the lateral displacement during the spring compression and the contact portion side There is an effect that the inclination of the end 11 can be reduced and stable conduction can be secured.

  Further, the spring constant around the bent portion 3 is changed by changing the plate thickness and the plate width as in the second to fifth embodiments, instead of offsetting the bent portion 3 on the base portion side toward the center line 5 side. It is also preferable to increase the spring constant of the bent portion 3 by providing a notch in the other bent portion.

  Further, as in the first to fifth embodiments, the spring constant around the bent portion 23 on the contact portion side is increased, and the contact portion side end portion 11 is inclined toward the counterpart conductor side. It is also suitable to configure.

  In the first to sixth embodiments, the case where the present invention is applied to the connection between the vehicle window antenna 50 and the vehicle has been described. However, in the present invention, the contact portion 28 is pressed against the mating conductor to make contact conduction. If it is a part, it can apply not only to the window antenna for vehicles.

It is a perspective view of the contact device incorporating the zigzag thin leaf spring of the first embodiment of the present invention. It is sectional drawing of the contact apparatus incorporating the zigzag thin leaf spring of the 1st Embodiment of this invention. It is a front view of the zigzag thin leaf spring of the 1st embodiment of the present invention. It is a perspective view of the zigzag thin leaf | plate spring of the 1st Embodiment of this invention. It is modification explanatory drawing of the zigzag thin leaf | plate spring of the 1st Embodiment of this invention. It is a perspective view of the zigzag thin leaf | plate spring of the 2nd Embodiment of this invention. It is a perspective view of the zigzag thin leaf | plate spring of the 5th Embodiment of this invention. It is a front view of the zigzag thin leaf spring of the 6th embodiment of the present invention. It is a perspective view of the zigzag thin leaf | plate spring of the 6th Embodiment of this invention. It is modification explanatory drawing of the zigzag thin leaf | plate spring of the 6th Embodiment of this invention. It is a perspective view which shows the vehicle incorporating a window antenna. It is a perspective view of a window antenna. It is sectional drawing of a contact device of a prior art, and a front view of the zigzag thin leaf spring used for this. It is a deformation | transformation explanatory drawing of the zigzag thin leaf spring of a prior art. This is a conventional S-shaped thin leaf spring. It is a U-shaped thin leaf spring of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2, 2a-2e Flat plate part 3, 4, 4a-4d, 23 Bending part, 5 Center line, 6, 6a, 7, 7a Nominal outline, 9,100 Contact device, 10 Base part side edge part 10a Alignment hole, 11 Abutting part side end, 11a Convex part, 12 Base part, 12a Bolt hole, 14 Zigzag thin leaf spring, 15 Notch part, 18 Movement, 20 Terminal part, 28 Abutting part, 28a Concave part , 34 guide holes, 36, 38 engaging claws, 40 through holes, 50 vehicle window antenna, 52 antenna element, 52a end contact (mating conductor), 54 rear window glass, 56 roof panel, 58 support base base, 60 abutting portion, 112a contact portion, E _{1 to} E ₃ Young's modulus, H superposed portion, I _{1 to} I ₃ cross-section second moment, k _{1 to} k ₃ , k _{11 to} k ₁₃ bending spring constant, δ ₁ displacement Angle, Cm ₁₁ ˜Cm ₁₃ Shape factor of spring bent portion, R _{1 to} R ₃ spring bent portion bending radius, Δθ _{1 to} Δθ ₃ , Δθ ₉ rotation angle displacement, ε _{1 to} ε ₅ horizontal displacement, θ _{1 to} θ ₃ angle.

Claims (13)

A base part;
A zigzag thin leaf spring having one end fixed to the base portion and a plurality of flat plate portions made of conductors and bent portions alternately connected,
A contact portion of a conductor that is urged by the zigzag thin leaf spring and pressed against the mating conductor;
A contact device that performs contact conduction with the counterpart conductor via the contact portion,
Making the spring constant of the bent portion on the base portion side of the zigzag thin plate spring and the spring constant of the bent portion on the contact portion side larger than the spring constant of the other bent portion;
A contact device characterized by. A base part;
A zigzag thin leaf spring having one end fixed to the base portion and a plurality of flat plate portions made of conductors and bent portions alternately connected,
A contact portion of a conductor that is urged by the zigzag thin leaf spring and pressed against the mating conductor;
A contact device that performs contact conduction with the counterpart conductor via the contact portion,
The outer shape of the zigzag thin leaf spring on the base portion side and the outer shape on the contact portion side are offset inward from the nominal outer shape line of the zigzag spring,
A contact device characterized by. The contact device according to claim 1 or 2,
The flat plate portion length between the bent portions on the base portion side of the zigzag thin plate spring and the flat plate portion length between the bent portions on the contact portion side are shorter than other flat plate portion lengths,
A contact device characterized by. The contact device according to claim 1 or 2,
The bending width of the zigzag thin leaf spring on the base portion side and the plate width of the flat plate portion and the width of the bending portion on the contact portion side and the flat plate portion are larger than the widths of the other bending portions and the flat plate portion. ,
A contact device characterized by. The contact device according to claim 1 or 2,
The thickness of the bent portion and the flat plate portion on the base portion side of the zigzag thin plate spring and the thickness of the bent portion and the flat plate portion on the contact portion side are thicker than the plate thickness of the other bent portions and the flat plate portion. thing,
A contact device characterized by. The contact device according to claim 1 or 2,
The bending part bending radius on the base part side and the bending part bending radius on the contact part side of the zigzag thin leaf spring are smaller than the bending radii of other bending parts,
A contact device characterized by. The contact device according to any one of claims 1 to 6,
The flat plate portion on the contact portion side of the zigzag thin plate spring is inclined toward the mating conductor;
A contact device characterized by. A base part;
A zigzag thin leaf spring having one end fixed to the base portion and a plurality of flat plate portions made of conductors and bent portions alternately connected,
A contact portion of a conductor that is urged by the zigzag thin leaf spring and pressed against the mating conductor;
A contact device that performs contact conduction with the counterpart conductor via the contact portion,
The spring constant of the bent part on the base part side of the zigzag thin leaf spring is larger than the spring constant of the other bent parts,
The flat plate portion on the contact portion side of the zigzag thin plate spring is inclined toward the mating conductor;
A contact device characterized by. A base part;
A zigzag thin leaf spring having one end fixed to the base portion and a plurality of flat plate portions made of conductors and bent portions alternately connected,
A contact portion of a conductor that is urged by the zigzag thin leaf spring and pressed against the mating conductor;
A contact device that performs contact conduction with the counterpart conductor via the contact portion,
The outer shape of the base portion side of the zigzag thin leaf spring is offset inward from the nominal contour line of the zigzag spring,
The flat plate portion on the contact portion side of the zigzag thin plate spring is inclined toward the mating conductor;
A contact device characterized by. The contact device according to claim 8 or 9, wherein
The flat plate portion length between the bent portions on the base portion side of the zigzag thin plate spring is shorter than the other flat plate portion lengths,
A contact device characterized by. The contact device according to claim 8 or 9, wherein
The plate width of the bent portion and the flat plate portion on the base portion side of the zigzag thin plate spring is larger than the plate width of the other bent portion and the flat plate portion,
A contact device characterized by. The contact device according to claim 8 or 9, wherein
The thickness of the bent portion and the flat plate portion on the base portion side of the zigzag thin plate spring is thicker than the thickness of the other bent portion and the flat plate portion,
A contact device characterized by. The contact device according to claim 8 or 9, wherein
The bending part bending radius on the base part side of the zigzag thin leaf spring is smaller than the bending radius of the other bending part,
A contact device characterized by.

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