KR20050020767A - Self-leaded surface mount component holder - Google Patents

Abstract

A self-lead surface mountable device package 10 is provided for holding a wide variety of electrical devices with a wide variety of conductor wire sizes in a manner that achieves standardized conductor contact positioning. An approximately box-shaped structure is provided for device type diversity, which has a set of progressively stepped or tapered winding bosses 22 for positioning and securing a plurality of wire sized device conductors 26. Ensure proper matching with the conduction trajectories of surface-mount printed circuit boards and substrates.

Description

Self-Leaded Surface Mount Device Holder {SELF-LEADED SURFACE MOUNT COMPONENT HOLDER}

The present invention relates to an electrical circuit element holder suitable for surface mount technology. More specifically, the present invention relates to a self-leaded surface mount device holder that provides accurate wire wiring and secure fixing thereof while handling device connection wires of various sizes.

Because surface mounting of electrical devices on printed circuit boards (PCBs) and substrates is universal and efficient, there is an increasing demand for switching from non-surface mount components to surface mount devices. .

Examples of prior art surface mount element holders include U.S. Patent Nos. 4,754,370 to DeTizio et al., Entitled "Electrical Components with Added Connecting Conducting Paths"; Gutierrez, U.S. Pat.No. 5,212,345, entitled "Self-leaded Surface Mounted Coplanar Header," and U.S. Patent No. 5,212,345, entitled "Self-lead with Coil Lead Form." US Pat. No. 5,309,130 to Lint, Self Leaded Surface Mount Coil Lead Form, and Dangler, entitled "Low Profile Inductor / Transformer Component." US Pat. No. 5,760,669.

While surface mount options are widely used in the prior art, they provide pick and place compatibility, versatility for device conductors of different sizes, and accurate placement of multiple device conductors (in their leaded structure) in a single package. Such options are rarely known or used at present.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is explained with reference to the drawings, and FIG. 1 is an enlarged perspective view of a self-lead surface mount element holder according to the principles of the present invention.

Fig. 2 is a front view of the surface mount element holder of Fig. 1.

Fig. 3 is a detailed view of the portion B of Fig. 1, which is an enlarged detailed plan view of a part of the winding boss 22 of the surface mount element holder of Fig. 1, and Fig. 3 shows the fixing of the winding boss to the element connection wires of different sizes. It shows its characteristics.

4A, 4B, 4C and 4D are detailed end views of the winding boss 22 of the surface mount element holder of FIG. 1, indicated by circular line A in FIG. It shows the positioning of the element connection wire which gradually increases in size (cross section diameter).

FIG. 5 is an enlarged isometric view of an electrical element (annular coil or transformer) provided in the element holder of FIG. 1, which element is wrapped around four winding bosses of the type shown in FIGS. 2, 3 and 4A-4D. A wound coil connection element is provided.

It is a general object of the present invention to maintain a wide variety of electrical elements with various conductor wire sizes in a manner to achieve standardized conductor contact positioning, allowing self-lead surface mounts to overcome the drawbacks and limitations of the prior art. It is to provide a device package.

Another object of the present invention is to provide a self-lead surface mountable device holder formed into a box-shaped structure by plastic material for holding and connecting a wide variety of electrical devices.

It is a further object of the present invention to provide a set of winding bosses for surface mountable element holders, each boss having a groove converging in two dimensions or in two planes, wherein By narrowing the portion of the wall that is disposed and facing, the element connection wire having a diameter within the wire diameter range that is to be fixed is received and fixed.

Another object of the present invention is to secure the wire in a manner that overcomes the limitations and disadvantages of the prior art, as well as to ensure proper registration with the conducting traces of the surface mount printed circuit board and substrate, It is to provide a set of progressively stepped or tapered steps to each winding boss of the holder for positioning and securing a plurality of wire conductors.

In accordance with the principles and aspects of the present invention, a self-lead surface mount element holder includes a unitary housing formed of a plastic material for containing a particular electrical element. The unitary housing has a substantially flat upper wall portion and at least two sidewall portions that are suspended downward from both edge regions of the upper wall portion to form a device cavity for receiving an electrical element therein. A plurality of winding bosses extend outward from each side wall portion. Each winding boss has a bottom face that lies in a bottom plane that is substantially parallel to the plane of the top wall portion, an outer wall segment having an outer winding post that projects upwardly from the bottom segment having a bottom face, and an inner wall segment. . The inner surface of the outer wall segment and the inner wall segment form an inner groove that lies in a plane converging in a direction substantially perpendicular to the floor plane, the inner groove receiving the device connecting wire of the electrical element after being wound across the floor segment. Size to fix it. The winding post is provided to receive at least a portion of one wrap of the device connection wire after winding across the bottom surface and passing through the inner groove.

The present invention also provides a self-lead surface mount element holder comprising an integral housing formed of plastic material to receive a specific electrical element, such as a toroidal coil. The housing has a substantially flat upper wall portion and two sidewall portions that are suspended downward from both edge regions of the upper wall portion to form a device cavity for receiving the annular coil therein. A plurality of winding bosses extend outwardly from each side wall portion, these winding bosses having a bottom surface lying in a bottom plane substantially parallel to the plane of the top wall portion. Each winding boss further has an outer wall segment and an inner wall segment having an outer winding post portion projecting upwardly from the bottom surface. The inner surface of the outer wall segment and the inner wall segment converges along a plane substantially perpendicular to the floor plane to form an inner groove. Most preferably, the groove is formed by a plurality of steps formed in the inner surface of the inner wall segment approximately parallel to the floor plane, and adjacent inner walls converging with respect to the inner wall of the winding post portion, the size of each step being Is adapted to accommodate an element connection wire of a predetermined diameter that gradually decreases. Preferably, the holder also defines a wire guide ramp extending outwardly adjacent one side of each winding boss to guide the device connection wire to a predetermined winding position relative to the bottom surface of the particular winding boss.

In one aspect of the invention, the sidewall portion extends outwardly of the upper wall portion, and the holder is a plurality of joining outer edge regions of the sidewall portion to form two upper wall access / vent holes on both sides of the upper wall portion. And an end wall portion of the.

The present invention also provides a surface mount electrical assembly having a self leaded surface mount element holder and an electrical element such as an annular coil. The holder has an integral housing formed of a plastic material, the housing having a substantially flat upper wall portion and two sidewall portions suspended downward from both edge regions of the upper wall portion and extending outward of the upper wall portion; Two end wall portions joining the outer edge regions of the side wall portions to form two top wall access / vent holes on both sides of the top wall portion, and a device cavity for receiving the electrical elements therein. The holder includes a plurality of winding bosses that extend outwardly on both outer sides of the unitary housing and have a bottom surface that lies in a bottom plane that is substantially parallel to the plane of the top wall portion. Each winding boss has an outer wall segment having an outer winding post portion projecting upwardly from the floor surface, and an inner wall segment, the outer wall segment and the inner wall segment converging in a direction substantially perpendicular to the floor plane, An inner groove is formed, the inner groove being most preferably stepped to receive and secure the device connection wire of the diameter of one of the plurality of predetermined diameters. The device in the device cavity of the holder comprises a plurality of device connection wires of the diameter of one of the predetermined diameters. Each device connection wire is first wound across the bottom face of the winding boss, then wound through the groove and secured by a converging inner surface of the outer wall segment and the inner wall segment, after which the winding post portion is at least partially Is wound round. In this aspect of the invention, the holder is preferably a wire guide slope extending outwardly adjacent one side of each winding boss to guide each element connecting wire to a predetermined winding position relative to the bottom face of the winding boss. It is provided.

The above and other objects, advantages, aspects and features of the present invention will be more readily understood upon consideration of the detailed description of the preferred embodiments described in connection with the following figures.

The element holder 10 according to the principles of the present invention includes an upper wall portion 12, curved sidewalls 14, 16, end walls 18, 20, and so that elements 24 may be disposed therein. It is formed integrally as a generally box-shaped shape with an open bottom plane. Holders 10, often referred to as "headers" in the electrical device industry, are typically formed from moldings of suitable dielectric plastic materials selected to meet specific device applications in terms of electrical and mechanical properties. The holder 10 thus formed forms an internal device cavity (indicated by reference numeral 25) that is dimensioned and structured to receive a specific electrical element, such as an annular coil or transformer 24, through the bottom. Once the device is in place within the holder 10, the device can be secured in the interior space 25 using suitable potting materials, compounds or other suitable means or media. As shown in Fig. 1, end walls 18 and 20 are located outside of the adjacent edge of the upper wall portion 12 so that a hole 27 is provided to close the electrical element 24 in the holder 10. Promoting proper cooling, the conductor wire end 26 of the electrical element 24 can pass through the hole 27 and be wound around a suitably positioned outer winding boss 22. In addition, the curved sidewalls 14, 16 extend downward slightly beyond the end walls 18, 20, so that the two long sides extend along the length of the end walls 18, 20 and are located in the open plane of the floor. The rails 19 and 21 are formed. In the example shown in FIG. 1, the side walls 14, 16 are curved to accommodate annular elements such as coils or transformers wound around the annular core. Other shapes and geometries may be adapted to the sidewalls of the holder 10 depending upon the particular application.

The winding boss 22 is formed to receive and fix the end wires of the terminals of the electrical element 24 regardless of the specific wire size or diameter. The winding bosses 22 are formed and positioned to align with the positions of the printed circuit connection pads formed on the circuit board or the substrate according to predetermined dimensions and positions. The holder 10 can provide two or more winding bosses. In the preferred structure shown in FIG. 1, four winding bosses 22 are formed at the corners of the curved sidewalls 14 and 16. In the preferred structure of Fig. 5, six winding bosses are shown, with two further winding bosses 22 being formed in the end walls 18, 20. Depending on the surface mount-connection requirements of the particular electrical element, the holder may be provided with six or more winding bosses.

Each winding boss 22 forms an inner groove 23 that gradually narrows. In the most preferred form, the groove 23 has walls converging two-dimensionally, ie in the horizontal and vertical directions (see Figures 2 and 3). In a preferred form, the groove 23 is formed by the inner surface 32 of the winding post portion 34 and the stepped wall portion 30 therein. The bottom face 36 of the winding boss 22 is aligned with the bottom plane of the holder 10. In the structure of the bottom surface 36, a gap 38 through which a vapor phase solder deposition gas can pass may be formed to facilitate soldering of the conductors of the terminal ends to the pads of the printed circuit board or the substrate.

A series of stepped portions are formed in the stepped wall portion 30. In the detailed view of Fig. 3, four staircases 40, 42, 44, 46 are shown. More or fewer steps may be provided. Alternatively, the step may be replaced by a continuous wall of V-shape that extends to the vertex. Most preferably, the lateral segments of the inner wall portion perpendicularly adjacent to each of the steps 40, 42, 44, 46 are gradually reduced in width, so that the groove 23 has a hole on one side of the other side. Wider than the hole. As the width of the grooves 23 is gradually reduced in this manner, an auto-clinching function is provided, as shown in FIGS. 4A to 4D and 5, in which the wires are first bottom surface 36. ), After winding around both sides of the boss, and then through the inner hole 23, and finally wound on both sides of the winding post portion 34, fixing the conductor wire 26 of the terminal end of the appropriate size It is sized and adapted to maintain it. (FIG. 5 shows that a relatively large diameter wire 26 is partially wound around the winding post portion 34.)

The end conductor wire 26 is wound around the winding boss 22 in the direction of decreasing the width of the groove 23, so that the winding boss 22 fixes the wire end and reliably holds it in place. The insulating plastic material forming the holder is selected to have sufficient rigidity to efficiently secure the wire inside the groove 23. Examples of preferred plastic materials for the holder 10 include epoxy, phenol, glass filled nylon, or other materials having suitable mechanical properties to hold the wire ends 26 as well as to withstand the temperatures generated during the surface mount soldering process. Plastic material is included. It is presently preferred to use Ryton ^™ R4 glass fiber reinforced polyphenylene sulfides supplied by Chevron Phillips Chemical Company LP.

A chamfered edge 48 may be formed in the winding post portion 34 at the outer corner which impinges when the wire exits the groove. Adjacent to the bottom face 36 of the winding boss 22, a guide slope or surface 50 is formed in the wall of the holder 10 to connect the wire 26 to the holder 10 and the corresponding winding boss 22. It can act as a conductor guide, which is arranged in a proper outward alignment. In this way, the portion of the wire 26 passing across the bottom surface 36 will be aligned with the conduction trajectory of the printed circuit board, and the final assembly will be attached to the substrate. The portion of the wire 26 passing across the bottom surface 36 is first properly prepared or tin plated to be soldered to the conduction trajectory as is commonly practiced in surface mount applications.

As shown in FIG. 5, the wire end 26 of the annular coil 24 exits a hole between the upper wall portion 12 and the end wall 20, so that the sidewalls 16 adjacent to the winding boss 22 are closed. Extends downward along a portion. Wire end 26 is directed away from sidewall 16 by wire guide surface 50. Thereafter, a sharp turn is provided to the wire so that the wire is directed across the bottom face 36 of the winding boss 22 and then rises back and winds up into the groove 23. In the example shown in FIG. 5, the wire end 26 has a cross-sectional diameter that requires the use of the widest and highest portion of the groove 23, formed by the first step 40. Wire end 26 is pulled through narrow groove 23 and wound 1/4 turn around winding post 34.

4A, 4B, 4C and 4D show how the holder 10 accommodates wire ends of a wide variety of diameters. In Fig. 4A, the conductor wire end 26A has a small diameter and is formed by the lowest step 46 and fits into the deepest recess of the groove having the narrowest width w1. The side wall 52 adjacent the step 46 has, for example, a height dimension d1 set to correspond to the four diameters of the wire end 26A, in this example four turns around the winding post 34. (The top turn is cut off in FIGS. 4A, 4B, 4C, and 4D to add clarity in describing these examples). In FIG. 4B, a larger diameter wire end 26B is fitted into the groove 23 and placed in the second step 44. In this example, the width of the groove in the step 44 is w2 and the height of the wall segment adjacent the step 44 is d2. Three turns of the wire end 26B are formed around the winding post 34. In FIG. 4C, a larger diameter wire end 26C is disposed in the groove 23 and seated against the step 42. The width of the grooves 23 in the step 42 is w3, and the height of the wall segment adjacent the step 42 is d3. In this example, two turns are formed around the winding post 34. Finally, in FIG. 4D, the conductor 26 has a sufficiently large diameter to use the widest step 40 and one turn is formed around the winding post 34. The width of the grooves 23 in the step 40 is w4 and the height of the wall segment adjacent the step 40 is d4.

Due to the stepped width of the groove 23, accurate positioning is ensured for the various conductor sizes available for a particular device assembly. The depth of each channel through the grooves 23 is determined by the physical requirements of the assembly and the number of conductors required to withstand the vibrations and shocks generated in the intended application or use environment. As shown in Figures 4A-4D, smaller conductors use two or more windings around the winding post 34, while larger conductors use only one winding to achieve the desired mechanical strength and Mounting strength can be achieved. Alternatively, any pair of wires that typically meet the tab in the center of the inductor may be wound around the winding boss 22 to be secured to the winding boss, with the groove 23 being at least two wires for that particular application. It is adapted to accommodate the diameter.

The conductor wire ends are typically wound around the holder 10 in one of two ways. Each conductor end is wound around a single winding boss as shown in FIG. 5, or each conductor is wound around two adjacent winding bosses to accommodate two terminal elements, such as a single annular coil conductor.

As described with reference to the preferred embodiment of the present invention, it will now be understood that the object of the present invention is completely achieved, many modifications in structure can be proposed by those skilled in the art without departing from the spirit and scope of the present invention. It will be appreciated that there may be several different embodiments and applications of the present invention. Accordingly, the disclosure and description herein are exemplary only and are not intended to be limiting in any sense.

Claims (12)

Self-leaded surface mount device holder At least two sidewalls formed of a plastic material to accommodate a particular electrical element, and having a substantially flat upper wall portion and suspended below from both edge regions of the upper wall portion to form a device cavity for receiving the electrical element therein; An integral housing having a portion, and A plurality of winding bosses extending outwardly from each sidewall portion and having a bottom surface lying in a bottom plane substantially parallel to the plane of the top wall portion, Each winding boss further has an outer wall segment having an outer winding post projecting upwardly from the bottomed floor segment, and an inner wall segment, wherein the inner surfaces of the outer wall segment and the inner wall segment are substantially in the floor plane. The inner groove is sized to receive and secure the element connection wires of the electrical element after being wound across the bottom surface, the inner groove being formed in a plane converging in a vertical direction. A self leaded surface mount element holder for receiving at least a portion of one wrap of a connecting wire after being wound across. Self-lead surface mount element holder At least two sidewalls formed of a plastic material to accommodate a particular electrical element, and having a substantially flat upper wall portion and suspended below from both edge regions of the upper wall portion to form a device cavity for receiving the electrical element therein; An integral housing having a portion, and A plurality of winding bosses extending outwardly from each sidewall portion and having a bottom surface lying in a bottom plane substantially parallel to the plane of the top wall portion, Each winding boss further has an outer wall segment having an outer winding post portion projecting upwardly from the bottom surface, and an inner wall segment, wherein the inner surfaces of the outer wall segment and the inner wall segment converge in two directions to form an inner groove. And the inner groove receives and secures a device connection wire of a diameter of one of a plurality of predetermined different diameters. 3. The self-lead surface mount device holder as claimed in claim 2, wherein the inner wall segment defines a plurality of steps approximately parallel to the floor plane and adjacent walls converging to the inner surface of the outer wall segment. 3. The self-contained system according to claim 2, further comprising a wire guide ramp extending outwardly adjacent one side of each winding boss for guiding the device connection wire to a predetermined winding position relative to the bottom face of the winding boss. Leaded surface mount element holder. The self-leaving surface mount element holder as claimed in claim 2, wherein the winding post portion comprises a chamfered outer edge. 3. The plurality of end walls of claim 2 wherein the side wall portions extend outwardly of the top wall portion and join the outer edge regions of the side wall portion to form two top wall access / vent holes on either side of the top wall portion. Self-lead surface mount element holder further comprising a portion. 3. The device of claim 2, further comprising an electrical device in a device cavity having a plurality of device connection wires of one of the predetermined diameters, each device connection wire being first wound across the bottom surface of the winding boss. And a self-lead surface mount element holder aligned through the groove and fixed by a converging inner surface of the outer wall segment and the inner wall segment and then at least partially aligned around the winding post portion. 8. The self-lead surface mount device holder as claimed in claim 7, wherein the electrical device comprises a toroidal inductor having at least one coil providing the plurality of device connection wires. A surface mount electrical assembly comprising a self-lead surface mount element holder having an integral housing and an electrical element therein, The holder is formed of a plastic material to receive a particular electrical element, and has a substantially flat upper wall portion, and two sidewall portions suspended downward from both edge regions of the upper wall portion and extending out of the upper wall portion; Two end wall portions joining the outer edge regions of the side wall portions to form two top wall access / vent holes on both sides of the top wall portion, and a device cavity for receiving electrical elements therein; The holder includes a plurality of winding bosses that extend outwardly on both outer sides of the unitary housing and have a bottom surface that lies in a bottom plane that is substantially parallel to the plane of the top wall portion, each winding boss being An outer wall segment having an outer winding post portion projecting upwardly from the bottom surface, and an inner wall segment, the inner surface of the outer wall segment and the inner wall segment converge in two directions to form an inner groove; Sized to receive and secure a device connection wire of a diameter of one of a plurality of predetermined different diameters that can be accommodated therein, The electrical device in the cavity includes a plurality of device connection wires of a diameter of one of a predetermined diameter, each device connection wire being first wound across the bottom surface of the winding boss and then aligned through the groove, the outer wall A surface mount electrical assembly secured by a converging inner surface of the segment and the inner wall segment, and then at least partially aligned around the winding post portion. 10. The surface mount electrical assembly of claim 9 wherein the inner surface of the inner wall segment defines a plurality of steps approximately parallel to the floor plane and adjacent walls converging to the inner surface of the outer wall segment. 10. The surface mount electrical assembly of claim 9 wherein the electrical component comprises an annular inductor having at least one coil having the plurality of component connection wires. 10. The surface mount electrical assembly of claim 9 further comprising a wire guide slope extending outwardly adjacent one side of each winding boss to guide the device connection wire to a predetermined winding position relative to the bottom surface of the winding boss. .