CN210430161U - Surface mounting deflection-reducing spring sheet with height-stopping base and protrusive cantilever - Google Patents

Abstract

The utility model discloses a surface mounting subtracts inclined to one side shell fragment with end high base and preceding outstanding cantilever, include: an adsorption base section; two height stopping side wall sections which are bent downwards from opposite side surfaces of the adsorption base section and extend to a preset height, and two installation sections which are bent from the bottom edges of the height stopping side wall sections respectively and extend oppositely and are used for being welded to the circuit board; an extend by the absorption base section and buckle and with the installation segment spaced elasticity arm section, this elasticity arm section includes a preceding lug that extends by the preceding process of absorption base section, by preceding lug towards the installation segment bend extension's recurve camber portion, and by recurve camber towards keeping away from the installation segment extension, through adsorbing the predetermined interval between base section and the installation segment to the cantilever part that surpasss the terminal height lateral wall section: and the end edge of the cantilever part far away from the downward bending part is reversely bent to form a bending supporting section extending towards the mounting section.

Description

Surface mounting deflection-reducing spring sheet with height-stopping base and protrusive cantilever

Technical Field

The utility model relates to a surface mounting shell fragment especially relates to a surface mounting subtracts inclined to one side shell fragment with end high base and preceding outstanding cantilever.

Background

The spring plate used in the electronic industry is made of metal materials such as phosphor bronze, stainless steel, etc. through the steps of stamping, bending, heating and shaping, and then is fixed on a circuit board by Surface-mount technology (SMT) welding, and the metal material of the spring plate itself is used for conductive contact between circuit components, signal transmission, or providing compression and buffering by mechanical elasticity through the elastic restoring force of bending. As electronic devices are becoming smaller, the area of the pads on the circuit board is also being reduced.

As shown in fig. 1, when the conventional elastic sheet 9 is pressed, the elastic arm 90 and the absorption portion 92 are often forced to be compressed downward, and otherwise, as shown by the dotted line, the elastic arm 90 and the absorption portion 92 are inclined backward along the arc direction toward the left side of the drawing, so that a certain stroke space for the elastic arm 90 and the absorption portion 92 to be inclined backward is additionally reserved on the circuit board besides the original length L for soldering, and therefore, the front-back length actually occupied on the circuit board is extended from the originally marked L to L', and the elastic contact portion of the elastic sheet structure is also deflected due to the rotation of the elastic arm when being pressed downward, so that the position of an object above the drawing contacting the elastic sheet is changed, and the deflection is generally more serious in the case that the stroke of the elastic arm is longer.

In addition, the spring plate is designed to protect the elastic arm from being damaged by excessive pressure, and as shown in fig. 2, the left and right sides of the welding section 96 are bent upwards to form two side walls 94 that are substantially parallel to each other, and if the elastic arm 90 is pressed down excessively, a part of the pressure is shared by the upright side walls 94, so that the overall structural strength is increased. However, the side walls 94 extending upward from the solder segments 96 still have the problem of being damaged by tilting when pressed, and when tilted, can interfere with other components on the left and right sides of the circuit board. Therefore, in the former case, the elastic arm 90 is additionally provided with the left and right elastic legs 98 which are bent laterally, extended downwardly and then bent, in addition to the original vertical bending, so that the structure that the elastic arm 90 is pressed downward by force is not easily damaged. Although this structure reduces the probability of damage to the spring arms 90, the standard size of 0402, which is the length of the welding area of 0.04 inch and the width of 0.02 inch, is changed to a metric system, which is a range of 1mm long and 0.5mm wide, respectively, in consideration of the common spring plate specification. When bending is performed at a plurality of complex angles within such a small size, the design of the die is very difficult, and thus, not only is the output efficiency of the product affected, but also the yield of the product is reduced, and the cost is greatly increased. On the other hand, the elastic sheet is also deflected by changing the position of the upper contact point when the elastic arm is pressed and bent downward due to the backward tilt of the elastic arm, so that the corresponding antenna or other electronic components cannot be miniaturized smoothly.

Therefore, how to smoothly reduce the area occupied by the elastic sheet on the circuit board; an ideal adsorption base section can be provided in the adsorption process, the probability of falling due to poor adsorption is reduced, and the output efficiency is improved so as to be beneficial to automatic surface installation; but also can keep good predetermined structure to provide good conductive contact, signal transmission, or provide the effect that receives the pressure buffering and support the protection with mechanical elasticity, especially when the elastic arm receives down force elastic deformation, the contact point position offset can be reduced, will be the utility model discloses the solution that will want is key.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned not enough of prior art, according to the utility model discloses an embodiment hopes to provide an adsorb basic section stable in structure's surface mounting who has only high base and protrudingly cantilever subtracts inclined to one side shell fragment, aims at realizing following mesh: (1) by means of the ingenious design of the position of the tying belt, the occupied installation area of the circuit board is smoothly reduced, and the requirement of miniaturization is met; (2) the falling probability during adsorption is reduced, and the output efficiency of surface mounting is improved; (3) the height stopping base protects the structure safety of the elastic arm section when bearing excessive pressure, ensures the product performance and is not easy to deform; (3) by means of the structure of the protrusive cantilever, the displacement of the elastic arm when the elastic arm bends under stress is compensated, and the offset is reduced to ensure the accurate position of the contact point of the product.

According to an embodiment, the utility model provides a pair of surface mounting subtracts inclined to one side shell fragment with end high base and proud cantilever supplies to weld to a slice circuit board, and this surface mounting cantilever shell fragment includes: an adsorption base section; two height-stopping side wall sections bent downward from opposite sides of the adsorption base section to a predetermined height, wherein each height-stopping side wall section has a top edge connected with the adsorption base section and a bottom edge opposite to the top edge; two installation sections which are respectively bent from the two bottom edges, oppositely extend with a preset interval kept between the two installation sections and the adsorption base section and are used for being welded to the circuit board; an elastic arm section extending and bending from the adsorption base section and provided with a space from the installation section, wherein the elastic arm section comprises a front projection extending from the adsorption base section, a downward bending part extending from the front projection towards the installation section, and a cantilever part extending from the downward bending part towards the installation section and passing through the preset space between the adsorption base section and the installation section to exceed the height-stopping side wall section: and the end edge of the cantilever part far away from the downward bending part is reversely bent to form a bending support section extending towards the mounting section, wherein the distance between the bending support section and the mounting section is less than the distance of the cantilever part protruding out of the height-stopping side wall section.

By means of the surface mounting deflection-reducing elastic sheet with the height-stopping base and the protrusive cantilever, the deflection of the elastic arm when the elastic arm bends downwards under stress is effectively compensated by the stressed reverse rotation of the protrusive cantilever, so that the deflection of a contact point is effectively reduced; the adsorption base section, the height-stopping side wall section and the installation section are encircled to form a height-stopping base to support and protect the elastic arm section, so that the compression part of the elastic arm section is not easily deformed due to compression when the compression part is pressed and displaced to be lower than the adsorption base section; the ingenious lacing design of the cantilever section enables the miniaturization of the elastic sheet to be possible; particularly, the adsorption base section is directly used as a part of the stop high base and is stably supported by the stop high side wall section, so that the problem of large tolerance or compression and retraction does not exist when the suction nozzle is sucked and moved, the adsorption falling rate is reduced, and the problem is solved at one stroke.

Drawings

Fig. 1 is a perspective view of a conventional surface mount spring.

Fig. 2 is a perspective view of another conventional surface mount spring.

Fig. 3 is a perspective view of the surface mount deflection-reducing elastic sheet of the present invention with a height-stopping base and a protrusive cantilever according to a first preferred embodiment.

Fig. 4 is a right side view of the embodiment of fig. 3.

Fig. 5 is a front view of the embodiment of fig. 3.

Fig. 6 is a left side cross-sectional view of the embodiment of fig. 3 (illustrating the position of the resilient arm segment when the resilient tab is not under force).

Fig. 7 is a left side cross-sectional view of the embodiment in fig. 3 (illustrating the position of the elastic arm section when the elastic sheet is deformed by being pressed by a force).

Fig. 8 is a perspective view of the embodiment of fig. 3 surface mounted to a circuit board.

Fig. 9 is a schematic top view of the metal sheet of the embodiment of fig. 3 before it is bent and the strap is not broken (illustrating the design position of the spring strap of the present invention, so that the spring can be miniaturized).

Fig. 10 is a front view of a second preferred embodiment of a surface mount deflection-reducing clip of the present invention having a height-stop base and a forward-protruding cantilever.

Fig. 11 is a perspective view of a third preferred embodiment of the surface mount deflection-reducing spring with a height-stop base and a cantilever projecting forward.

Wherein: 1. 1' is an adsorption base section; 2. 2 ', 2' to the high side wall section; 22 is the top edge; 24. 24' is a bottom edge; 3. 3 'and 3' are installation sections; 32 is a butt flange; 34' is an auxiliary foot part; 4. 4' is an elastic arm section; 42 is a front projection; 44. 44', 44 "are downturned portions; 46 is a cantilever part; 48 is a reinforcing rib;

5 is a bending support section; 6' is a surrounding selective welding section; 7 is a circuit board; 8 is a metal sheet; 80 is a lace; 82 is a tie point; 9 is a spring plate; 90 is an elastic arm; 92 is an adsorption part; 94 is a side wall; 96 is a welding section; and 98 is a spring foot.

Detailed Description

The invention will be further elucidated with reference to the drawings and the embodiments. These examples are to be understood as merely illustrative of the present invention and not as limiting the scope of the invention. After reading the description of the present invention, those skilled in the art can make various changes and modifications to the present invention, and these equivalent changes and modifications also fall within the scope of the present invention defined by the claims.

First preferred embodiment

As shown in fig. 3-6, a surface mount deflection-reducing elastic sheet with a height-stopping base and a protrusive cantilever according to a first preferred embodiment of the present invention includes: an adsorption base section 1 as a link center position of the metal sheet; two height-stopping side wall sections 2 bent downward from opposite sides of the adsorption base section 1 to a predetermined height, wherein for the sake of convenience of illustration, the height-stopping side wall sections 2 are defined as a top edge 22 at the upper part of the drawing and a bottom edge 24 at the lower part thereof; the bottom edges 24 of the two height-stopping side wall sections are bent and extended oppositely to form two mounting sections 3, in the embodiment, the two mounting sections 3 are complementary with each other at a slight interval and together form a welding surface for welding to the position of a welding pad on the circuit board, and for convenience of description, the two sides of the interval are called butt-joint edges 32; the other side of the adsorption base section 1 extends to form an elastic arm section 4, the elastic arm section 4 is divided into a front protruding part 42 approximately coplanar with the adsorption base section, a downward bending part 44 bent and extended from the front protruding part 42 to the installation section, and a cantilever part 46 bent upwards from the downward bending part 44; and a bending support section 5 bent reversely by the cantilever portion 46 and extending toward the mounting section 3.

Since the suction base section 1 and the two mounting sections 3 are substantially parallel and a predetermined gap height corresponding to the height-stop side wall section 2 is maintained therein, suction of the surface mount suction nozzle can be provided, and the cantilever portion 46 of the elastic arm section 4 can be bent upward from the lowermost edge of the downward bent portion 44, raised in the height direction through this gap to exceed the plane of the suction base section 1, and bent downward again to extend out of the bent support section 5.

In the present invention, the tail of the cantilever 46 far from the downward bending part 44 is exposed above the adsorption base section 1 in an unstressed state, so that when an electronic component (not shown) above is relatively close to and pressed downward, the tail will firstly abut against the part where the cantilever 46 is connected with the bending support section 5, and force the elastic arm section 4 and the bending support section 5 to rotate and bend along the counterclockwise direction of the drawing, in order to enhance the structural strength of the abutting contact connection part, in the present embodiment, the part is formed with a section of upward convex reinforcing rib far from the installation section 3, so that the part is called a reinforcing rib 48; of course, those skilled in the art will readily appreciate that the reinforcing rib 48 is not necessarily limited to a protrusion, and may have only one or even only a single protrusion, all of which do not hinder the practice of the present invention.

As shown in fig. 7 and 8, since the adsorption base section 1 is connected to the top edges 22 of the raised side wall sections 2 at both sides, and the bottom edge of the raised side wall section 2 is connected to the mounting section 3, and the mounting section 3 is welded to the circuit board 7, when the circuit module above the adsorption base section 1 is pressed down, the adsorption base section 1 cannot move or rotate, the true axis capable of undergoing rotational deformation is the connecting edge of the front protrusion 42 and the adsorption base section 1, so that the left side of the front protrusion 42 is slightly bent upwards, and the downward bent portion 44 is deflected and twisted towards the left side of the drawing, so as to reduce the rightward deflection of the reinforcing rib 48 caused by the downward bending of the cantilever portion 46, so that the elastic arm disclosed by the present invention can greatly reduce the deflection of the pressed contact portion to be almost negligible in the process of compressive deformation.

And because the shortest distance between the bending support section 5 and the mounting section 3 is less than the distance of the cantilever portion 46 protruding out of the height-stopping sidewall section 2, after the reinforcing rib 48 is pressed down to a predetermined height, the bending support section 5 will contact the mounting section 3 first and provide enhanced restoring force due to elastic deformation, so as to avoid permanent deformation caused by the elastic arm section 4 absorbing downward force alone; subsequently, as the degree of depression continues to increase, the resilient rib 48 will be compressed to a level flush with the height of the top edges 22 of the suction base section 1 and the height-stop side wall section 2, at which point the height-stop base formed by the suction base section 1, the height-stop side wall section 2 and the mounting section 3 will act as a support to protect the retracted resilient arm section 4 from damage. Due to the smart design of the front protrusion 42, the cantilever 46 must not only be slightly elongated in the lateral direction, but also the elongation of this part will bring about a double increase in the length of the entire resilient arm section 4, allowing the total amount of deformation caused by the depression to be borne by the longer sheet metal, the number of times the product can be repeatedly compressed and thus increased, and in the case of a total height of the spring plate of, for example, only 1.6 millimeters (mm), the compressed reinforcing rib 48 can achieve a downward feed of 0.7mm, while the lateral offset of the contact point can be ignored. And because the elastic arm section 4 can not deviate or even fall down due to pressing, surrounding components can not be affected completely, the occupied installation area is effectively saved, other spaces on the circuit board can be completely used by other components in an elastic manner, and the aim of meeting the miniaturization is fulfilled.

In the present embodiment, the most superior to the prior art structure design is to use the downward bending portion 44 as the material tying point, as shown in fig. 9, the metal elastic sheet manufactured by the current automated stamping method starts with a metal sheet 8, the excess portion is stamped and removed first, all the portions required for manufacturing the bent elastic sheet are left, and a tying band 80 for connecting all the materials is left, after the whole elastic sheet is gradually bent from a flat sheet to form a single elastic sheet at the rightmost side, the tying band 80 is cut off from the material tying point 82, and the formed elastic sheet is collected for the subsequent processes such as electroplating or heat treatment. However, the required width of the tie 80 is at least 0.5mm and is generally symmetrical, i.e. if the tie points are designed in parallel, the side faces are left with a tie width of more than 1mm, which is a significant limitation to the current miniaturization requirements of spring plates in the industry. Taking the 0402 specification common in the industry as an example, the standard size of 0402 is that the length of a welding area is 0.04 inch, the width of the welding area is 0.02 inch, and the welding area is changed into a metric system which is respectively a range of 1mm long in a zone and 0.5mm wide, and two tying points which are parallel to each other cannot be accommodated in the long and wide distance; even if the standard is relaxed, the standard is changed into the 0603 standard which is common in the industry, but the length and width distances are 1.5mm and 0.75mm, and the existence of the material dots which exist side by side cannot be allowed. Therefore, in this embodiment, two flat side edges 440 of the downward bending portion are used as tying points, even though the elastic sheet with 0402 specification has 0.9mm in the height direction, a space of 0.5mm can be reserved to accommodate the downward bending portion 44 to extend in the height direction, and the tying points are stretched on two opposite side edges, each side only needs 0.5mm, the size of the whole elastic sheet can be fully miniaturized, according to the prior art, the manufactured elastic sheet can reach the length of 1mm, the width of 0.5mm and the height of 1.6mm at the minimum, the feeding amount of 0.7mm can be achieved, and almost no lateral deviation exists when the elastic sheet is pressed, so that the elastic sheet greatly exceeds various conventional products.

In this embodiment, the side walls of the downward bending part are in an outward-expanding plane shape, so that the downward bending part 44 has a width larger than that of the adsorption base section 1 when viewed from the front, thereby completely shielding the front opening in the process of electroplating or automatically accommodating the material belt and reducing the probability of mutual interference; and the elastic arm section 4 has a width substantially equal to that of the suction base section 1, thereby providing greater compression resistance. However, as those skilled in the art can readily understand, the structure is only a single embodiment of the present invention, and is not necessarily limited thereto, please refer to fig. 10, wherein the same parts as those of the previous embodiment are not repeated in the second preferred embodiment of the present invention.

Second preferred embodiment

In the embodiment, the bottom edges of the two height-stopping side wall sections 2 ' are not bent and extended with mounting sections complementary to each other, but the mounting section 3 ' on one side is wider, and the other side only takes the bottom edge 24 ' of the height-stopping side wall section 2 ' as the mounting section 3 ' for being welded to a welding pad on a circuit board; further, the kick portion 44 'in the present embodiment also does not have a width larger than the suction base section 1', and only the widths corresponding to the suction base section 1 'and the elastic arm section 4' need to be maintained.

Due to the design of the front protruding part, the cantilever part correspondingly extends, the length of the elastic arm section is increased together, the plastic deformation range is effectively improved, and the height stopping base surrounded by the adsorption base section, the height stopping side wall section and the installation section together assists in supporting and guaranteeing, so that the product is ensured not to deform easily; in addition, the adsorption base section is supported by the side wall sections with the two side height stopping sides, so that the adsorption base section is not easy to deform, and can selectively provide machine tool adsorption together with the front protruding part even after being miniaturized, the adsorption base section is ensured not to fall off easily in the adsorption process of surface mounting, and the output efficiency of the surface mounting is improved; in addition, the special structure of the protrusive cantilever effectively compensates the front and back displacement when the elastic arm bends under stress, reduces the offset, ensures that the contact point position is still accurate and does not have the backward falling problem even if the elastic sheet is elastically fed and contracted under pressure in the using process of the product, and substantially reduces the occupied area of the elastic sheet; particularly, by means of the ingenious design of the position of the tying belt, the installation area of the occupied circuit board is smoothly reduced, the trend of the miniaturization demand trend of the electronic assembly is met, and the purpose is completely achieved.

Third preferred embodiment

Furthermore, owing to the protective structure that embraces of only high base makes the utility model discloses an even the shell fragment still can keep strong structure under the miniaturized condition, for providing the elasticity that the user selected more, also can change the welding position and regard as the pressurized shell fragment of side direction. As shown in fig. 11, except the same portions as the first preferred embodiment, two high-end side wall sections 2 "are away from the end edge of the downward bent portion 44", and are bent oppositely to extend two surrounding weld selecting sections 6 "substantially parallel to the downward bent portion 44"; therefore, the user can declare when ordering, so that the flat downward bending part 44 'is used as a plane for the suction nozzle to suck when the product is filled with the material belt, and the product is welded to the preset welding pad position of the printed circuit board around the selective welding section 6'. Especially for increasing the utility model discloses the holistic support intensity of shell fragment can also select at least one in installation section 3 ", buckles and extends one and encircle the supplementary foot 34 of selecting soldering section 6" coplanar with the side direction, lets the utility model discloses the shell fragment stands more firmly at the welding user mode of this kind of side direction compression.

Claims (8)

1. A surface mount deflection reducing spring with a raised base and a projecting cantilever for soldering to a circuit board, the surface mount deflection reducing spring comprising:

an adsorption base section;

two height-stopping side wall sections bent downward from opposite sides of the adsorption base section to a predetermined height, wherein each height-stopping side wall section has a top edge connected with the adsorption base section and a bottom edge opposite to the top edge;

two installation sections which are respectively bent from the two bottom edges and oppositely extend with a preset interval kept between the two installation sections and the adsorption base section;

an elastic arm section extending and bending from the adsorption base section and provided with a space from the installation section, wherein the elastic arm section comprises a front projection extending from the adsorption base section, a downward bending part extending from the front projection towards the installation section, and a cantilever part extending from the downward bending part towards the installation section and passing through the preset space between the adsorption base section and the installation section to exceed the height-stopping side wall section: and

and the end edge of the cantilever part far away from the downward bending part is reversely bent to form a bending support section extending towards the mounting section, wherein the distance between the bending support section and the mounting section is less than the distance of the cantilever part protruding out of the height-stopping side wall section.

2. A surface mount deflection reducing clip as set forth in claim 1, wherein said mounting sections are formed with two complementary mating edges on sides thereof remote from said bottom edges.

3. The surface mount deflection reducing clip as set forth in claim 1, wherein said turndown portion has a width greater than said suction base section.

4. A surface mount deflection reducing clip as set forth in claim 1, 2 or 3, wherein said downturned portion has two flat side edges.

5. The surface mount deflection-reducing dome as set forth in claim 1, wherein said cantilever portion has a width corresponding to said suction base section.

6. A surface mount deflection reducing dome as set forth in claim 1 wherein a reinforcing rib is formed at the junction of said cantilever portion and said buckling support section and faces away from said mounting section.

7. The surface mount deflection reducing clip as set forth in claim 1, further comprising two laterally surrounding weld selecting sections extending from said two high-stop side wall sections away from said end edge of said turndown portion and bent toward each other.

8. The surface mount deflection reducing clip as set forth in claim 7, wherein at least one of said mounting sections has an auxiliary leg extending therefrom in a generally coplanar relationship with said laterally surrounding weld selection section.

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