JP6202372B2 - Contact member and contact structure - Google Patents

Description

  The present invention relates to a contact member and a contact structure.

  2. Description of the Related Art Conventionally, a contact structure is known in which a coil spring-like contact is brought into pressure contact with a conductor portion formed on a printed wiring board to electrically connect the two (see, for example, Patent Document 1). In the contact structure disclosed in FIGS. 4 and 10 of Patent Document 1, a coil spring-like contact is interposed between a pair of opposed printed wiring boards, and a conductor portion on each printed wiring board is a coil spring. Are electrically connected via a contact.

JP 2002-170617 A

  By the way, the coil spring-like contact as described above is in a state where it can be elastically deformed in the direction in which the shaft bends in addition to elastic deformation and expansion and contraction in the axial direction. When such a coil spring contact is used in a device that transmits strong vibrations, if the coil spring contact may bend as the printed wiring board is shaken, the print is accompanied by the bending deformation. There may be a shift in the contact position on the wiring board.

  For this reason, for example, when the conductor portion serving as the contact position on the printed wiring board is small, problems such as momentary disconnection (instantaneous contact failure) are likely to occur due to the displacement of the coil spring contact. was there. Also, if the coil spring-like contactor vibrates and the conductor part on the printed wiring board continues to be rubbed, the conductor part formed of a very thin copper foil may be worn or peeled off. It was a factor causing poor contact.

  The present invention has been made to solve the above-described problems, and one of its purposes is a contact structure that employs a pressure-contact type contactor such as a coil spring-like contactor. It is in providing the technique for suppressing the position shift | offset | difference with respect to and the damage of a to-be-contacted contact location.

Hereinafter, the configuration employed in the present invention will be described.
The contact member of the present invention has a joint portion soldered to a conductor portion of the printed wiring board on one side of both sides in a front-back relationship, and is compressed in the axial direction and elastically deformed on the other side. The contact portion has a contact portion where the tip of the contact is pressed, and the joint portion is soldered to the conductor portion, and the tip of the contact is pressed against the contact portion to electrically connect the conductor portion and the contact. The contact portion is press-contacted to the contact portion by fitting either one of the contact portion side and the contact portion on the other end. A misregistration suppressing portion that suppresses the tip of the contactor in a state of being displaced from a predetermined contact position is formed.

  According to such a contact member, the contact member can be mounted on the printed wiring board by soldering the joint to the conductor portion of the printed wiring board. Further, if the tip of the contact is pressed against the contact portion in such a mounted state, the contact portion and the conductor on the printed wiring board can be electrically connected via the contact member.

  And since the position shift suppression part is formed in the contact part, the front-end | tip part of either one is fitted in the other side among a contact part side and a contactor side. For this reason, the positional deviation suppressing portion suppresses the tip of the contact that is in pressure contact with the contact portion from being displaced from the predetermined contact position. Further, when vibration is transmitted to the contactor or the printed wiring board, even if the tip of the contactor is slightly displaced from a predetermined contact position, the contactor tries to return to the direction in which the compressive stress is most relaxed. Therefore, even if the conductor portion on the printed wiring board is small, if the contact member is mounted there, the contact between the contact member and the contact can be maintained satisfactorily.

  Further, such a contact member can easily have a structure with high mechanical strength as compared with a conductor portion on a printed wiring board formed in a thin film shape. Therefore, even if the contact member vibrates and the contact member continues to be rubbed, it does not wear or peel off like the conductor part on the printed wiring board. If the oxide film on the surface of the member is scraped, the electrical resistance between the contact and the contact member decreases. Therefore, the electrical contact between the contact member and the contact can be favorably maintained.

  By the way, in the contact member of the present invention, the specific shape of the misregistration suppressing portion is any shape as long as it is an optimum shape for suppressing misregistration in accordance with the tip shape of the contact. However, if a more specific example is given, for example, the misregistration suppressing portion protrudes toward the contact, and the tip portion thereof fits inside the opening portion at the tip of the contact. It is preferable that the contact part side convex part to be stuck or the contact part side concave part to be recessed in a direction away from the contact side and into which the tip part of the contact part is fitted.

  If such a contact part side convex part or a contact part side concave part is provided as a positional deviation suppression part, the convex part at the tip of either one of the contact part side and the contact side is a concave part on the other side. So that the desired displacement suppressing action can be exhibited.

  In the contact member of the present invention, the contact portion side convex portion or the contact portion side concave portion has a tapered surface corresponding to a side surface of a cone or a truncated cone, and in the tapered surface, the contactor It is preferable to contact the coil spring-like tip portion of

  If a structure having such a tapered surface is employed, when a force that strongly presses the tip of the contact toward the tapered surface is applied, the coil spring-like tip portion is in contact with the tapered surface while the diameter is expanded or reduced. Can be maintained. Further, if such a force is not applied, the expanded coil spring-shaped tip portion can be kept in contact with the tapered surface while the diameter-reduced coil spring-shaped tip portion is contracted, or the reduced coil spring-shaped tip portion is expanded. The contact with the tapered surface can be maintained while the diameter is increased. Therefore, when the tip of the contact is formed in a coil spring shape, the contact between the contact and the contact member can be maintained extremely well by adopting this configuration.

Moreover, the contact member of this invention WHEREIN: It is preferable that the junction part side recessed part dented in the direction away from the said printed wiring board side is formed in the said junction part.
If such a joint-side concave portion is provided, when the joint is solder-joined to the conductor portion on the printed wiring board, the melted solder forms a fillet also in the joint-side concave portion. Accordingly, the bonding strength of the contact member to the printed wiring board can be improved as compared with the case where the solder fillet is formed only on the outer peripheral side of the bonding portion.

  Alternatively, the melted solder forms a fillet in the concave portion on the joint side, so that the bonding strength of the contact member to the printed wiring board can be sufficiently secured, so the amount of solder disposed on the outer peripheral side of the joint portion can be reduced. It can also be reduced. In this case, it is possible to suppress the molten solder from flowing out to the outer peripheral side of the joint, so that it is possible to reduce the arrangement interval with other parts arranged in the vicinity of the contact member. The mounting density of electronic components can be increased.

  In addition, even when there is a lot of solder paste sandwiched between the joint and the printed wiring board, excess solder can be released toward the joint-side recess, so that the contact member can be lifted by the excess solder. Can be suppressed.

  Further, in the contact member of the present invention, the joining portion is formed in a truncated cone shape having a smaller diameter as it approaches the printed wiring board side, and at the center of the circular end surface facing the printed wiring board side, It is preferable that the conical portion-side concave portion having a truncated cone shape having a smaller diameter as the distance from the wiring board side increases.

  According to such a contact member, the conical surface on the outer peripheral side of the joint portion and the conical surface on the inner peripheral side of the joint portion-side recess both have an inclination that forms an acute angle with the surface of the printed wiring board. Therefore, it becomes easy to form a solder fillet in the gap at the acute angle portion, and the bonding strength of the contact member to the printed wiring board can be improved.

  Furthermore, the contact structure of this invention is comprised with the contact member of this invention, and the above contacts. That is, the contact structure of the present invention includes a contact member that is solder-bonded to the conductor portion of the printed wiring board, a contact member that is compressed in the axial direction and elastically deformed, and whose tip is pressed against the contact member. The contact member has a joint part soldered to the conductor part on one side of both sides in a front-back relationship, and a contact part on which the tip of the contact is pressed on the other side, The tip of the contactor that is in a state of being in pressure contact with the contact part by fitting either one of the contact part side or the contactor side into the contact part. Is formed with a misregistration suppressing portion that suppresses deviation from a predetermined contact position.

  According to such a contact structure, since the structure corresponding to the contact member of the present invention is provided, the contact member is mounted on the printed wiring board and contacts the conductor portion on the printed wiring board via the contact member. The child can be electrically connected, and the contact between the contact member and the contact can be satisfactorily maintained by the misregistration suppressing portion. In addition, also in the contact member with which the contact structure of this invention is provided, of course, when a contact member of this invention is provided, a preferable structure is employable.

The contact member of 1st embodiment is shown, (a) is the top view, (b) is the front view, (c) is the bottom view, (d) is AA sectional view, (e) is the Perspective view. The contact structure comprised using the contact member of 1st embodiment is shown, (a) is the front view, (b) is a longitudinal cross-sectional view which expands and shows the B section. The contact member of 2nd embodiment is shown, (a) is the top view, (b) is the front view, (c) is the bottom view, (d) is CC sectional view, (e) is the Perspective view. The contact structure comprised using the contact member of 2nd embodiment is shown, (a) is the front view, (b) is a longitudinal cross-sectional view which expands and shows D section.

Next, embodiments of the present invention will be described with more specific examples.
[First embodiment]
A contact member 1 shown in FIGS. 1A to 1E is obtained by applying Ni plating and Au plating to a brass press-formed product. FIG. 1B is a front view of the contact member 1, but the rear view, the left side view, and the right side view are the same as the front view.

  The contact member 1 has a joint 2 on the lower surface and a contact 3 on the upper surface of the upper and lower surfaces. The joint portion 2 is formed in a truncated cone shape having a smaller diameter on the outer peripheral side, and a conical portion-side concave portion 11 having a truncated cone shape having a smaller diameter on the upper side is formed in the center of the lower end surface having a circular shape when viewed from below. ing. The contact part 3 has a frustoconical contact part side convex part 12 having a smaller diameter toward the upper side.

  As shown in FIGS. 2A and 2B, the contact member 1 as described above is formed on the printed wiring board 21 by soldering the joining portion 2 to the conductor portion 22 included in the printed wiring board 21. To be implemented. When the contact member 1 is sucked by the suction nozzle of the automatic mounting machine, the contact portion-side convex portion 12 is fitted into the inner periphery of the suction nozzle of the automatic mounting machine. The centers can be matched with high accuracy.

  Further, when soldering the joint portion 2 to the conductor portion 22 on the printed wiring board 21, the melted solder forms a fillet 23 on the outer peripheral side of the joint portion 2 and the inner peripheral side of the joint-side recess 11. Therefore, the bonding strength of the contact member 1 to the printed wiring board 21 can be improved as compared with the case where the solder fillet is formed only on the outer peripheral side of the bonding portion 2.

  In addition, since the fillet 23 is formed on the inner peripheral side of the joint-side concave portion 11, the bonding strength of the contact member 1 to the printed wiring board 21 can be sufficiently secured, so that the solder disposed on the outer peripheral side of the joint 2 You can deliberately reduce the amount. In this case, since the melted solder can be prevented from flowing out to the outer peripheral side of the joint portion 2, it is possible to reduce the arrangement interval with other components arranged in the vicinity of the contact member 1, and on the printed wiring board 21. The mounting density of electronic components can be increased.

  Furthermore, even if a large amount of solder paste is sandwiched between the joint portion 2 and the printed wiring board 21, the excess solder can be released to the joint-side concave portion 11 side, so that the contact member 1 is caused by the surplus solder. Can be prevented from floating.

  Further, in the present embodiment, the conical surface on the outer peripheral side of the joint portion 2 and the conical surface on the inner peripheral side of the joint portion-side recess 11 both have an inclination that forms an acute angle with the surface of the printed wiring board 21. Yes. Therefore, the fillet 23 is easily formed in the gap in the acute angle portion, and this also has the effect of improving the bonding strength of the contact member 1 to the printed wiring board 21.

  When the contact member 1 is mounted on the printed wiring board 21 as described above, the printed wiring board is interposed via the contact member 1 by further pressing the tip of the coil spring-like contact 25 to the contact portion 3. The conductor portion 22 on the terminal 21 and the contact 25 can be electrically connected.

  The tip of the contact 25 has a generally annular shape, and the inner diameter thereof is larger than the diameter of the minimum diameter portion of the contact portion side convex portion 12 and the diameter of the maximum diameter portion of the contact portion side convex portion 12. The diameter is also small. Therefore, the upper end of the contact part side convex part 12 fits in the inner peripheral side of the contactor 25, and the front-end | tip of the contactor 25 press-contacts to the taper surface 13 which the truncated cone-shaped contact part side convex part 12 has.

  Therefore, when vibration is transmitted to the printed wiring board 21 and the contact 25 compared to the case where the tip of the contact 25 is in contact with a flat surface (for example, the surface of the conductor portion 22 of the printed wiring board 21). The position of the tip of the contact 25 is prevented from being displaced from front to back and from side to side.

  Further, even if the tip of the contactor 25 is slightly displaced from the predetermined contact position, at that time, a part of the tip of the contactor 25 is displaced toward the upper end direction of the tapered surface 13. The contact 25 tries to return to the direction in which the compressive stress is most relaxed, and the portion shifted toward the upper end direction returns to the lower end direction of the tapered surface 13. That is, the contact 25 in a compressed state is always in a state of being extended, and the force acts as a force for displacing the contact 25 to a position coaxial with the contact portion-side convex portion 12.

  Further, when a force that strongly presses the tip of the contactor 25 toward the tapered surface 13 acts, even if the diameter of the tip portion of the coil spring increases, the contact with the tapered surface 13 can be maintained. Further, if such force does not act, the expanded coil spring-like tip portion can maintain contact with the tapered surface 13 while reducing the diameter.

  That is, in the contact member 1, the contact portion-side convex portion 12 functions as a position deviation suppressing portion that suppresses the tip of the contactor 25 from being shifted from a predetermined contact position. Compared with the case where it contacts directly, the contact of the contact member 1 and the contact 25 can be maintained favorably.

  Further, such a contact member 1 can easily have a structure with high mechanical strength as compared with the conductor portion 22 on the printed wiring board 21 formed in a thin film shape. Therefore, even if the contact member 25 vibrates and the contact member 1 continues to be rubbed, it does not wear or peel off like the conductor portion 22 on the printed wiring board 21. Rather, if the oxide film on the surface of the contact member 1 is scraped by rubbing against the contact 25, the electrical resistance between the contact 25 and the contact member 1 decreases. Therefore, the electrical contact between the contact member 1 and the contact 25 can be favorably maintained.

[Second Embodiment]
The contact member 31 shown in FIGS. 3A to 3E is obtained by applying Ni plating and Au plating to a brass press-formed product. FIG. 3B is a front view of the contact member 31, but the rear view, the left side view, and the right side view are the same as the front view.

  This contact member 31 is different from the contact member 1 exemplified as the first embodiment of the present invention in that a contact portion side recess 32 is provided instead of the contact portion side protrusion 12. The other points are the same as those of the contact member 1. The contact portion side recess 32 is formed in a truncated cone shape having a smaller diameter toward the lower side, and an inner peripheral surface thereof is a tapered surface 33.

  The contact member 31 as described above can be soldered to the conductor portion 22 of the printed wiring board 21 in exactly the same manner as the contact member 1, and the operation and effect thereof are the same as those of the contact member 1. Further, when the tip of the coil spring-like contact 25 is brought into pressure contact with the contact portion 3, the tip comes into contact with the tapered surface 33, thereby contacting the conductor portion 22 on the printed wiring board 21 via the contact member 31. The child 25 can be electrically connected.

  The outer diameter of the tip of the contact 25 is larger than the diameter of the minimum diameter portion of the contact portion side recess 32 and smaller than the maximum diameter of the contact portion side recess 32. Therefore, the tip of the contact 25 is fitted into the inner peripheral side of the contact portion-side recess 32, and the tip of the contact 25 is in pressure contact with the tapered surface 33.

  Even in such a combination of the contact portion side recess 32 and the contact 25, when the tip of the contact 25 is in contact with a flat surface (for example, the surface of the conductor portion 22 of the printed wiring board 21). In comparison, when the vibration is transmitted to the printed wiring board 21 or the contact 25, the front end of the contact 25 is prevented from being displaced from front to back and from side to side.

  Further, even if the tip of the contactor 25 is slightly deviated from the predetermined contact position, at that time, a part of the tip of the contactor 25 is displaced toward the upper end direction of the tapered surface 33. The contact 25 tries to return to the direction in which the compressive stress is most relaxed, and the portion shifted toward the upper end direction returns to the lower end direction of the tapered surface 33.

  Further, when a force that strongly presses the tip of the contactor 25 toward the taper surface 33 is applied, even if the coil spring-like tip portion is reduced in diameter, the contact with the taper surface 33 can be maintained. Further, if such a force is not applied, the coil spring-like tip portion having a reduced diameter can maintain the contact with the tapered surface 33 while expanding the diameter.

  That is, in the contact member 31, the contact portion-side concave portion 32 functions as a positional deviation suppressing portion that suppresses the tip of the contactor 25 from being shifted from a predetermined contact position. Compared with the case where it contacts, contact member 1 and contact 25 can be maintained satisfactorily.

  Further, such a contact member 31 can easily have a structure having high mechanical strength as compared with the conductor portion 22 on the printed wiring board 21 formed in a thin film shape. For this reason, even if the contact member 25 vibrates and the contact member 31 continues to be rubbed, it does not wear or peel off like the conductor portion 22 on the printed wiring board 21, and If the oxide film on the surface of the contact member 31 is scraped by rubbing, the electrical resistance between the contact 25 and the contact member 31 is lowered. Therefore, also from this point, the electrical contact between the contact member 31 and the contact 25 can be favorably maintained.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.

  For example, in each of the above-described embodiments, the contact 25 having a coil spring-shaped tip is illustrated, but the specific structure of the contact is not limited to the coil spring-shaped. For example, even if a cylindrical member attached to the tip of a coil spring-shaped shaft portion is used as a contact, a contact structure similar to that of the contact 25 described above can be configured.

  Moreover, in each said embodiment, what formed the junction part side recessed part 11 in the junction part 2 was illustrated, However, It is arbitrary whether the junction part side recessed part 11 is provided.

  DESCRIPTION OF SYMBOLS 1 ... Contact member, 2 ... Joint part, 3 ... Contact part, 11 ... Joint part side recessed part, 12 ... Contact part side convex part, 13 ... Tapered surface, 21 ... Printed wiring board, 22 ... Conductor part, 23 ... Fillet, 25 ... contact, 31 ... contact member, 32 ... contact portion side recess, 33 ... tapered surface.

Claims (3)

Of the two sides of the front / back relationship, one side has a joint that is soldered to the conductor part of the printed wiring board, and the other end is pressed against the tip of a contact that is compressed in the axial direction and elastically deformed The contact portion is configured to be electrically connectable to the contact portion by soldering the joint portion to the conductor portion and press-contacting the tip of the contact to the contact portion. And
The tip of the contactor that is in a state of being in pressure contact with the contact part by fitting either one of the contact part side or the contactor side into the contact part. Is formed a position deviation suppression portion that suppresses deviation from a predetermined contact position ,
The joint is formed with a joint-side recess that is recessed in a direction away from the printed wiring board side,
The joint portion is formed in a truncated cone shape having a smaller diameter as it approaches the printed wiring board side, and the diameter decreases toward the center of the circular end surface directed toward the printed wiring board side as the distance from the printed wiring board side increases. The contact member in which the said conical part side recessed part of truncated cone shape is formed . The misalignment suppressing portion protrudes toward the contact, and a tip portion of the contact displacement convex portion fits inside an opening at the tip of the contact, or a direction away from the contact side. 2. The contact member according to claim 1, wherein the contact member is any one of a contact portion-side recessed portion that is recessed, and into which a tip portion of the contact is fitted. A contact member to be soldered to a conductor portion of the printed wiring board;
A contact that is compressed in the axial direction and elastically deformed, and whose tip is in pressure contact with the contact member;
The contact member has a joint part soldered to the conductor part on one side of both sides in a front-back relationship, and a contact part on which the tip of the contact is pressed on the other side,
The tip of the contactor that is in a state of being in pressure contact with the contact part by fitting either one of the contact part side or the contactor side into the contact part. Is formed a position deviation suppression portion that suppresses deviation from a predetermined contact position ,
The joint is formed with a joint-side recess that is recessed in a direction away from the printed wiring board side,
The joint portion is formed in a truncated cone shape having a smaller diameter as it approaches the printed wiring board side, and the diameter decreases toward the center of the circular end surface directed toward the printed wiring board side as the distance from the printed wiring board side increases. A contact structure in which a conical truncated conical recess is formed .

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