CN107086388A - Press-fit contacts for printed boards and connectors using the contacts - Google Patents

Abstract

The present invention relates to the connector of printed board press fit contacts and the use contact.Connector includes printed board and contact, the matrix of contact has press-fitting connection end, being press-fitted connection end can radially elastic deformation, being press-fitted on connection end also has and the contact site for the conductive layer conductive contact being conductively connected on the wall of hole side, contact site is provided with the axially extending straight burr along press-fitting connection end, so that the lines that straight burr portion can be not only relied on when being conductively connected hole of press-fitting connection end insertion printed board carries out micro-deformation improve the elasticity of press-fitting connection end, make press-fitting connection end that there is more preferable confining force in hole is conductively connected, improve the stability of conductive contact, in addition, the straight burr of press-fitting connection end can be also pierced into the conductive layer being conductively connected in hole, contacted in order to be press-fitted connection end with the more preferable of conductive layer, this mode makes both contacts even closer, electric conductivity is more preferable, further increase the stability of conduction.

Description

Press-fit contacts for printed boards and connectors using the contacts

technical field

The invention relates to a press-fit contact for a printed board and a connector using the contact.

Background technique

Most of the existing solderless contacts for printed boards use a press-fit termination method to realize the insertion of the conductive connection holes on the printed board and the contacts. After plugging, the conductive layer in the conductive connection hole on the printed board (copper metal layer) realizes the transmission of electric current after being in contact with the contact.

Existing contacts generally adopt C-type, H-type, and M-type press-fit cross-sections. In addition, there are contacts with fish-eye structures, of which C-type press-fit cross-sections are U-shaped openings. There are the following problems when the conductive connection hole of the board is plugged: large plugging force, small holding force, and poor conductive contact performance after pressing. material, while the traditional T2 material with poor elasticity cannot be used, which makes the material cost of the contact piece relatively high.

H-type, M-type and fish-eye contacts have few conductive contact points and are not suitable for high-power and high-current applications. The Chinese patent with application publication number CN102055096A discloses a pin terminal (contact piece) for press-fit connection, which includes a mating part (ie, a male contact part) for mating with a female contact piece and a For the press-fit connection end connected to the conductive connection hole of the printed board, the press-fit cross-section of the press-fit connection end is an H-shaped structure with a thin wall in the middle and inferior arc bows on both sides. This structure passes two inferior arcs. The contact between the part and the conductive connection hole of the printed board realizes the conduction, the conductive contact area is small, and the elastic force of the middle thin-walled structure on the contact part of the two inferior arcs is also small, so that the elastic pressure between the contact part and the conductive connection hole is small , and when there is a processing error in the contact surface of the contact portion and the conductive connection hole, the contact area between the two will become smaller due to the incomplete bonding of the two, resulting in poor contact performance.

Contents of the invention

The purpose of the present invention is to provide a press-fit contact piece for printed boards that can be in closer contact with the conductive connection hole of the printed board and has better conductivity; the purpose of the present invention is also to provide a contact using the present invention. component connectors.

In order to achieve the above object, the technical solution of the press-fit contact for printed boards in the present invention is: the press-fit contact for printed boards includes a base body, and the base body has a press-fit contact for conductive connection holes of the printed board. The press-fit connection end of the connection, the press-fit connection end is provided with a relief slot that can make the press-fit connection end elastically deform inward along its radial direction, and the press-fit connection end also has a hole for connecting with the conductive The conductive layer on the side wall is in contact with the conductive layer, and the contact portion is provided with straight lines extending in the axial direction of the press-fit connection end.

The cross-section of the press-fit connection end is C-shaped.

The opening width of the C-shaped structure of the press-fit connection end is smaller than the diameter of the circular hole inside the C-shaped structure.

The outer end of the press-fit connection end is provided with a chamfer, and the surface of the chamfer is a smooth surface.

The material of the substrate is copper.

The technical scheme of the connector of the present invention is: the connector includes a printed board and a contact piece, the contact piece includes a base body, and the base body has a press-fit connection end that is press-fit connected with the conductive connection hole of the printed board, and the press-fit The connection end is provided with a relief slot that can make the press-fit connection end elastically deform inward along its radial direction, and the press-fit connection end also has a contact portion for conducting conductive contact with the conductive layer on the side wall of the conductive connection hole , the contact portion is provided with straight lines extending along the axial direction of the press-fit connection end.

The cross-section of the press-fit connection end is C-shaped.

The opening width of the C-shaped structure of the press-fit connection end is smaller than the diameter of the circular hole inside the C-shaped structure.

The outer end of the press-fit connection end is provided with a chamfer, and the surface of the chamfer is a smooth surface.

The material of the substrate is copper.

The beneficial effect of the connector of the present invention is: adopting the connector of the present invention, the connector includes a contact piece, and the outer peripheral surface of the press-fit connection end of the contact piece is provided with straight lines, so that the press-fit connection end is inserted into the conductive connection hole of the printed board At the same time, it can not only rely on the micro-deformation of the grain of the ruled part to improve the elasticity of the press-fit connection end, so that the press-fit connection end has better holding force in the conductive connection hole, and improve the stability of the conductive contact. In addition, the press-fit connection end Straight lines can also penetrate into the conductive layer (copper metal layer) in the conductive connection hole, so as to facilitate better contact between the press-fit connection end and the conductive layer. This way makes the contact between the two closer and the conductivity better. Further improve the stability of conduction.

Furthermore, the cross-section of the press-fit connection end is C-shaped, and the cylindrical outer peripheral surface of the press-fit connection end can be press-fitted with the conductive connection hole through elastic deformation. Compared with the traditional H-type, M-type and fish-eye structures, it has contact It has the characteristics of large area and large current, which is suitable for high-power conductive connection.

Furthermore, compared with the U-shaped opening groove of the traditional C-shaped press-fit cross-section, it has a smaller opening while ensuring the same elasticity, and the conductive contact area increases accordingly, that is, compared with the traditional C-shaped press-fit cross-section It is said that it has better elastic retention, so that the T2 material with poor elasticity can also be used, so as to save the cost increase caused by the use of expensive materials with good elasticity.

Further, a chamfer is provided on the outer end of the press-fit connection end so that the press-fit connection end has a guiding effect when inserted into the conductive connection hole of the printed board, and the purpose of not setting straight lines on the chamfer is to facilitate insertion at the chamfer It is more convenient when conducting the connection hole.

Description of drawings

Fig. 1 is a schematic structural view of a contact piece in an embodiment of a connector of the present invention;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the sectional view of B-B place among Fig. 2;

Fig. 4 is a schematic diagram of the structure when the contact is matched with the printed board;

In the figure: 1-printed board, 2-contact piece, 21-male contact part, 22-press-fit connection end, 221-relief slot, 2211-relief round hole, 2212-open groove, 222-straight grain Knurl, 223-chamfer, 23-step, a-open groove width.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The specific embodiment of the connector of the present invention, as shown in Figures 1 to 4, includes a printed board, a contact piece 2 and related housing parts (not shown in the figure), and the printed board and related housing parts are existing There is technology, so I won’t introduce too much. The contact piece includes a base body, the base body is a columnar body, and one end has a male contact part 21, which is plugged and matched with a female contact piece or a socket to achieve electrical conduction between the two. The outer end of the male contact part 21 has a chamfered or rounded structure The other end of the substrate has a press-fit connection end 22, the press-fit connection end 22 is used to press-fit the conductive connection hole on the printed board 1, and the press-fit connection end 22 is connected to the conductive connection hole. The tight fit of the conductive layer (copper metal layer) enables electrical conduction and connection.

The press-fit connection end 22 is an elastic conductive column with a C-shaped cross section. The slot hole of the press-fit connection end 22 is composed of a relief round hole and an open groove 2212. The relief round hole 2211 is the outer end surface of the self-press-fit connection end 22 A circular hole drilled into the press-fit connection end 22 along the axis of the press-fit connection end 22, the hole depth can extend to the other end surface of the press-fit connection end 22, that is, the step on the press-fit connection end 22 and the substrate At the contact position at 23, the setting of the step 23 can stop axially when it is mated with the printed board 1, preventing the base from being inserted too deeply. The setting of the relief hole 2211 can make the wall thickness of the press-fit connection end 22 equal. The press-fit connection end 22 is also provided with an open groove 2212 that extends from one end surface of the press-fit connection end 22 to the other end surface and penetrates the side wall between the inner and outer peripheral surfaces of the press-fit connection end 22 in the radial direction, that is, The opening groove 2212 is an opening formed on the wall after penetrating the wall of the press-fit connection end 22 along the radial direction of the press-fit connection end 22. When inserted into the conductive connection hole of the printed board 1, the relief slot 221 for the press-fit connection end 22 to elastically deform radially inward, because the relief slot 221 is through at the outer end of the press-fit connection end 22 The structure makes the deformation of the press-fit connection end 22 large when it is just inserted into the conductive connection hole of the printed board 1, which facilitates the insertion of the press-fit connection end 22; because the inner end of the press-fit connection end 22 and the step 23 of the base body are Integral structure, the slot hole 221 ends at the step 23, and the deformation at the opening slot 2212 is relatively small relative to the deformation of the outer end of the press-fit connection end 22, and the press-fit connection end 22 is inserted to a certain depth During this time, the deformation of the press-fit connection end 22 is small, so that the holding force provided by the elastic deformation is relatively large, so that the press-fit connection end 22 can better contact with the conductive connection hole of the printed board 1 and improve the conductivity stability. The width a of the opening groove is smaller than the diameter of the relief hole, so that the press-fit connection end and the conductive connection hole have a larger conductive contact area on the basis of ensuring the same deformation.

The outer end of the press-fit connection end 22 is provided with a chamfer 223 so as to provide a guiding function when the press-fit connection end 22 is inserted into the conductive connection hole on the printed board 1 , and to facilitate the insertion of the two.

The outer peripheral surface of the press-fit connection end 22 is provided with straight-grain knurling 222, and the lines of the straight-grain knurl 222 can provide a small amount of deformation, so that the press-fit connection end 22 has a better performance when mating with the conductive layer of the conductive connection hole. Elasticity, so that the insertion force of the press-fit connection end 22 is smaller than the holding force of the press-fit connection end 22 to the conductive connection hole, which is convenient for insertion and at the same time ensures the reliability of the conductive connection. The straight grain knurling 222 can also penetrate into the conductive connection hole In the conductive layer, the tight fit is realized, the contact area is increased, and the conductivity is enhanced. In addition, the structure of the mutual cooperation between the straight grain knurling 222 and the relief slot 221 can also have better performance for printed boards 1 of different thicknesses. Strong holding force and sufficient conductive area, strong applicability. The straight grain knurling 222 is set away from the chamfer 223 of the press-fit connection end 22 so as to be inserted into the conductive connection hole through the chamfer 223 more smoothly.

When the press-fit contact piece for printed boards of the present invention is used: in the process of processing, the integrally formed substrate is processed, and the material can be T2 (copper) or other materials with poor elasticity but high conductivity and low cost. , first drill a relief round hole on the outer end of the press-fit connection end 22, then knurling the outer peripheral surface of the press-fit connection end 22, and then mill an open groove 2212 on the press-fit connection end 22 and process a chamfer 223; when plugged in, the press-fit connection end 22 of the contact piece 2 can be directly inserted into the conductive connection hole on the printed board 1, and the press-fit connection end 22 can be Good deformation, not only convenient and labor-saving when inserting, but also has good elastic retention. Straight grain knurling 222 penetrates into the conductive layer of the conductive connection hole, so that the conductive contact area is large enough, the fit is very tight, and it has good electrical conductivity. , can be applied to high-power conductive connections with large currents.

In other embodiments, the contact piece can also be a female contact piece, that is, the end away from the press-fit connection end is a cathode contact part, which can be used for plugging and mating with the male contact piece; the cross-section of the press-fit connection end can also be replaced by H-shaped Or M-shaped cross-section, correspondingly arrange straight grain knurling on the contact surface between the press-fit connection end and the conductive connection hole; if the conductive connection hole on the printed board is a square or other polygonal shape, the press-fit The cross-sectional peripheral shape of the connecting end needs to be compatible with it; the shape of the relief slot is not limited to the shape of the above embodiment, and can also be replaced by a U-shaped structure in cross section. At this time, the diameter and opening of the relief hole The slot widths are equal, of course, when using a material with good elasticity to make the substrate, the width of the opening slot can also be greater than the diameter of the give way hole; the substrate can be made of other materials with good electrical conductivity and good elasticity, such as copper alloy , tin bronze, etc.

Embodiments of the press-fit contact for printed boards of the present invention are the same as the embodiments of the contact in each embodiment of the connector of the present invention, and will not be repeated here.

Claims (10)

1. a kind of printed board press fit contacts, including matrix, it is characterized in that, described matrix, which has, to be used to lead with printed board The press-fitting connection end of hole press-fit connection is electrically connected, the press-fitting connection end, which is provided with, can make radial direction of the press-fitting connection end along itself The resigning slotted eye elastically deformed inward, press-fitting on connection end also there is the conductive layer conduction being used for being conductively connected on the wall of hole side to connect Tactile contact site, the contact site is provided with the axially extending straight burr along press-fitting connection end.

2. printed board press fit contacts according to claim 1, it is characterized in that, the cross section of the press-fitting connection end For C-shaped.

3. printed board press fit contacts according to claim 2, it is characterized in that, the C-shaped knot of the press-fitting connection end The A/F of structure is less than the diameter of the circular hole inside C-shaped configuration.

4. the printed board press fit contacts according to claim 1-3 any one, it is characterized in that, the press-fitting connection The outer end at end is provided with chamfering, and the surface of chamfering is smooth surface.

5. the printed board press fit contacts according to claim 1-3 any one, it is characterized in that, the material of described matrix Matter is red copper.

6. connector, including printed board and contact, contact include matrix, it is characterized in that, described matrix has and printed board The press-fitting connection end for being conductively connected the connection of hole press-fit, the press-fitting connection end be provided with can make press-fitting connection end along itself Radially-inwardly the resigning slotted eye of elastic deformation, is press-fitted on connection end and is also connect with the conductive layer conduction with being conductively connected on the wall of hole side Tactile contact site, the contact site is provided with the axially extending straight burr along press-fitting connection end.

7. connector according to claim 6, it is characterized in that, the cross section of the press-fitting connection end is C-shaped.

8. connector according to claim 7, it is characterized in that, the A/F of the C-shaped configuration of the press-fitting connection end is small The diameter of circular hole inside C-shaped configuration.

9. the connector according to claim 6-8 any one, it is characterized in that, the outer end of the press-fitting connection end is provided with Chamfering, the surface of chamfering is smooth surface.

10. the connector according to claim 6-8 any one, it is characterized in that, the material of described matrix is red copper.