MAGNETIC SENSOR COMPONENT AND ASSEMBLY
20210048489 ยท 2021-02-18
Inventors
Cpc classification
H05K2201/10598
ELECTRICITY
H05K2201/10659
ELECTRICITY
Y02P70/50
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
H05K2201/1081
ELECTRICITY
H05K2203/167
ELECTRICITY
International classification
G01R33/00
PHYSICS
H05K3/30
ELECTRICITY
Abstract
A sensor comprises a housing; and a lead frame comprising at least three elongated leads having an exterior portion extending from the housing; and a magnetic sensor circuit disposed in the housing, and connected to the lead frame. The housing comprises two recesses arranged on two opposite sides of the housing for allowing the sensor to be mounted to a support. The lead frame may further comprise a plurality of tabs disposed between the elongated leads, for use as test pins. A component assembly comprising said sensor mounted on a support between deformable protrusions. A method of making said component assembly, comprising the step of positioning said component on the support between said protrusions, and deforming said protrusions such that they are at least partially disposed within the recesses.
Claims
1. A sensor comprising: a housing; a magnetic sensor circuit provided within the housing; and a lead frame that includes a body portion and a plurality of elongated leads, at least a portion of the body portion of the lead frame supporting the magnetic sensor circuit; wherein each of the elongated leads includes an interior portion and an exterior portion, the interior portion being located inside the housing and the exterior portion extending from the housing; wherein the elongated leads include a first lead and a second lead; wherein the first lead is integrally formed with the body portion of the lead frame; wherein the interior portion of the second lead includes a first portion, a second portion, and an intermediate portion situated electrically between the first portion of the second lead and the second portion of the second lead; wherein the sensor further comprises at least a first bond wire electrically connecting the second portion of the second lead and the magnetic sensor; wherein the sensor further comprises at least a first passive, discrete component situated inside the housing, the first passive, discrete component having a first terminal electrically connected to the intermediate portion of the second lead and a second terminal electrically connected to the first lead; and wherein the first portion of the second lead extends from the intermediate portion of the second lead to the exterior portion of the second lead.
2. The sensor according to claim 1, wherein the housing includes a plurality of recesses including at least a first recess on a first side of the housing and a second recess on a second side of the housing, the first side of the housing being opposite from the second side of the housing, and wherein the recesses are configured to allow the sensor to be mounted by heat-stacking.
3. The sensor according to claim 1, wherein the sensor further comprises a second passive, discrete component situated inside the housing, the second passive, discrete component having a first terminal electrically connected to the intermediate portion of the second lead and a second terminal electrically connected to the first lead.
4. The sensor according to claim 1, wherein the first passive, discrete component is a surface mount component.
5. The sensor according to claim 1, wherein the first passive, discrete component is a capacitor, a resistor, or a diode.
6. The sensor according to claim 1, wherein the first passive, discrete component is surface-mounted to the lead frame.
7. The sensor according to claim 1, wherein the second terminal of the first passive, discrete component is surface-mounted to part of the body portion of the lead frame.
8. The sensor according to claim 1, wherein the second terminal of the first passive, discrete component is surface-mounted to a portion of the first lead.
9. The sensor according to claim 1, wherein the lead frame defines in part an elongated cut-out, the elongated cut-out extending between a part of the body portion of the lead frame that supports the magnetic sensor and an elongated interconnection portion that is part of the first lead.
10. The sensor according to claim 9, wherein the interconnection portion of the first lead has a width of about 0.3 mm over a major portion of a length of the elongated cut-out.
11. The sensor according to claim 9, wherein the body portion of the lead frame has a length in a direction parallel to the elongated cutout, and the body portion of the lead frame has a width in a direction perpendicular to the elongated cut-out, the length of the body portion being larger than the width of the body portion.
12. The sensor according to claim 1, wherein the interior portion of the first lead includes a first portion and a second portion, the first portion extending from the exterior portion of the first lead, the first portion extending in a first direction, and the second portion of the first lead extending from the first portion in a second direction, the second direction being transverse to the first direction.
13. The sensor according to claim 12, wherein the first direction is perpendicular to the second direction.
14. The sensor of claim 1, wherein the lead frame further includes an island and the elongated leads further include a third lead, wherein the interior portion of the third lead includes a first portion proximal to the external portion of the third lead, and a second portion that is integral with the first portion, the second portion of the third lead being distal from the external portion of the third lead; wherein the second portion of the third lead is electrically connected to the first lead by at least a second passive, discrete component; wherein the island is electrically connected to the second portion of the third lead by at least a third passive, discrete component; and wherein the sensor further comprises a second bond wire electrically connecting the island and the magnetic sensor, wherein the second bond wire and the second passive, discrete component and the third passive, discrete component are situated in the housing.
15. The sensor according to claim 1, wherein a narrowest width of the exterior portion of the first lead is in a range of 0.5 mm to 0.7 mm.
16. A component assembly comprising: a support having a receiving zone and at least two deformable protrusions including a first protrusion and a second protrusion adjacent to the receiving zone; and the sensor according to claim 2, wherein the sensor is disposed on or over the support within the receiving zone between the first protrusion and the second protrusion such that the first recess is adjacent to the first protrusion and the second recess is adjacent to the second protrusion; and wherein the first protrusion is at least partially disposed within the first recess and the second protrusion is at least partially disposed within the second recess.
17. A method of producing a component assembly, the method comprising the steps of: a) providing a sensor according to claim 2; b) providing a support having a receiving zone and at least two deformable protrusions including a first protrusion and a second protrusion adjacent to the receiving zone; and c) disposing the sensor on or over the support within the receiving zone between the protrusions such that the first recess is adjacent to the first protrusion and the second recess is adjacent to the second protrusion; and d) deforming the protrusions such that the first protrusion is at least partially disposed within the first recess and the second protrusion is at least partially disposed within the second recess and the sensor is aligned and clamped to the support.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0094] The foregoing and other objects, aspects, features, and advantages of the present disclosure will become more apparent and better understood by referring to the following description taken in conjunction with the accompanying drawings, in which:
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[0116] The features and advantages of the present disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the drawings, in which like reference characters identify corresponding elements throughout. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements. The figures are not necessarily drawn to scale.
DETAILED DESCRIPTION OF THE INVENTION
[0117] Electronics manufacturing processes typically pick-and-place electronic components, such as integrated circuits, onto a substrate such as a printed-circuit board or into a test fixture. However, such placement processes have a limited positional accuracy and the actual position of the integrated circuit on the printed circuit board or in the test fixture can vary somewhat. Embodiments of the present invention can provide improved positioning of electronic devices in low-cost structures that are easy to make and adapt to a wide variety of circumstances and that provide simple electrical connections to the electronic device.
[0118] The cost of electronic components is largely determined by its package, and the choice of package is often dictated by the number of external connections. There is often a tradeoff to be made between a large package with a large number of pins, with good testability but a higher cost of the component and requiring more space, versus a smaller package with a smaller number of pins, with reduced testability, but a lower cost, and requiring less space.
[0119] Referring to
[0120] More in particular, the component 10 shown in
[0121] The alignment holes 16 are disposed in the exterior portion 15 of the leads 14A and are configured to receive a positioning pin 24 (examples of which are shown in
[0122] Circuit 18 can be an electronic circuit, for example an integrated circuit, disposed in the housing 12 and electrically connected with wire bonds to an interior portion of the leads 14 located inside the housing 12. Circuit 18 can be an analog circuit, a digital circuit, or a mixed signal circuit and can include both integrated and discrete components, for example including a discrete passive component 19 such as a resistor or a capacitor or a diode (shown in
[0123] Housing 12 can serve as a body of the component 10 that may have a cavity in which a semiconductor substrate and any discrete components are disposed and electrically connected. The semiconductor substrate may comprise an integrated circuit die formed in, on, or as a part of the semiconductor substrate. The elongated leads 14A may be electrically connected to the integrated circuit die and/or to the passive component(s) 19 via wire bonds 17. Housing 12 can be, for example, a ceramic or plastic package, as is known in the integrated circuit industry.
[0124] Leads 14 are typically also referred to as fingers or pins or connection pins and can serve as electrical connections to the circuit 18. Leads 14 can be electrically conductive and can comprise metal or a metal alloy, for example comprising copper, aluminum, tin, silver, gold or other metals and can be formed into a variety of shapes for example by stamping or die cutting or other metal-forming methods known in the art. Similarly, alignment holes 16 in leads 14 can be formed by stamping, die cutting, molding or other known methods. Leads 14 can be coated or layered. Leads 14 can have different lengths, shapes, and may be connected to different elements of the component 10, for example to different contact pads of circuit 18.
[0125] In some embodiments of the present invention, at least two of the leads 14 (e.g. a first and a second lead) are electrically connected leads 14A, electrically connected to the circuit 18, and an alignment hole 16 is disposed in each of the at least two leads 14A. In the exemplary embodiment of
[0126] In some embodiments (see for example
[0127] In some embodiments, a lead 14 can comprise multiple alignment holes 16. For example,
[0128] In other embodiments, a component 10 can have any combination of connected or disconnected leads 14A, 14B each with no alignment holes 16, one alignment hole 16, or two or more alignment holes 16.
[0129] The embodiment of
[0130] In various embodiments of the present invention and referring to
[0131] According to some embodiments of the present invention, an exterior portion 15 of a lead 14 has an average width 40 and the width 44 of the central portion 15b of the lead 14 at the location of the alignment hole 16 is greater than the average width 40.
[0132] In some embodiments, the width 46 of the proximal portion 15a of the lead 14 adjacent to the housing 12 is less than the average width 40. By decreasing the first width 46 of the proximal portion, space can be provided for additional connections (i.e. the tabs 14C), and by increasing the width of the central portion 15b of the lead 14 at the location of the alignment hole 16, a robust mechanical structure can be provided.
[0133] The housing of the component 10 shown in
[0134] As shown in
[0135] In the embodiment shown in
[0136] Referring to
[0137] A positioning pin 24 can be disposed within only one alignment hole 16 of the component, or a positioning pin 24 can be disposed within each of at least two alignment holes 16 of the component, or a positioning pin 24 can be disposed within each alignment hole 16 of the component.
[0138] As shown in
[0139] Referring to
[0140] A support 20 can be planar (as shown in
[0141] In various embodiments, the support 20 can comprise a resin or epoxy substrate, a multi-layer structure, for example planar structures, a cast, molded, or machined part or structure, for example comprising a polymer, metal, metal alloy, or ceramic. Likewise, the positioning pins 24 can be cast, molded, or machined, or formed by etching a part or structure. The positioning pins 24 may be electrically conductive or electrically insulating, and may comprise a polymer, metal, metal alloy, or ceramic. The positioning pins 24 may be rigid, flexible, compliant, or ductile. A positioning pin 24 may be electrically connected to each of, any one of, or none of the leads 14 and the wires 60.
[0142] According to embodiments of the present invention, the positioning pins 24 disposed in the alignment holes 16, for example by locating components 10 on the receiving zone 30 on or over the surface 22 of the support 20 with the positioning pins 24 disposed in the alignment holes 16 by pick-and-place equipment, serve to precisely locate the component 10 with respect to the support 20 in a simple and inexpensive way that can be applied to a broad variety of component assembly structures. By requiring at least two positioning pins 24 in respective alignment holes 16, the component 10 is spatially fixed in position with respect to the support 20 so that component 10 cannot rotate or move with respect to the support 20. By providing alignment holes 16 in the leads 14, additional alignment or mounting structures are rendered unnecessary, for example special housing 18 and support 20 structures, so that the components 10 can be smaller and take up less area of the support 20. Or stated in other words, for the particular package shown in
[0143] Referring to
[0144] In some embodiments of the present invention, after the component 10 is disposed with positioning pins 24 in alignment holes 16, the positioning pin 24 can be deformed so that a portion of the positioning pin 24 is disposed over a portion of the electrically conductive exterior portion 15 of the lead 14 that is not the alignment hole 16 in the lead 14, e.g. adjacent the alignment hole. For example, as shown in
[0145] In the example of
[0146] Positioning pins 24 may be mechanically deformed, e.g. plastically or permanently deformed (in contrast to elastically deformed), for example by striking the positioning pin 24 with a hammer on the side of the positioning pin 24 to bend it or on the top of the positioning pin 24 to flatten it. By deforming a positioning pin 24 within an alignment hole 16 of a lead 14, a component 10 is held in place and is not readily removed from the positioning pin 24 and support 20.
[0147] In other or additional embodiments of the present invention, the wire 60, positioning pin 24 and lead 14 may be soldered together with solder 50 to form an electrical connection electrically connecting the circuit 18 to the wires 60 and the positioning pin 24 through the lead 14, if the lead 14 is a connected, electrically conductive lead 14A and the positioning pin 24 is electrically conductive, so that the positioning pin 24 is electrically connected to the lead 14 in whose alignment hole 16 the positioning pin 24 is disposed.
[0148] Referring to the flow-chart of
[0149] A support 20 with one or more protruding positioning pins 24 is provided in step 110, for example by molding or laminating layers of resin or casting, molding, or machining materials such as ceramics, metals, or metal alloys into a desired shape, the shape providing a surface 22 with positioning pins 24 protruding from a surface 22 of the support 20 within a pre-determined receiving zone 30 for locating a component 10. In some embodiments, positioning pins 24 are partly inserted in through-holes of a PCB, and optionally soldered at the bottom side.
[0150] In step 120, a component 10 is disposed on a support 20 such that the alignment holes 16 of the component 10 are aligned with the positioning pins 24 of the support, and the positioning pins 24 are inserted into the alignment holes 16 (or vice versa), for example using pick-and-place equipment from a tape-and-reel package.
[0151] Once the component 10 is properly disposed in the receiving zone 30 of the support 20, in optional step 130 the positioning pins 24 can be optionally deformed to firmly, rigidly, permanently or irreversibly hold the component 10 in position with respect to the support 20. Multiple positioning pins 24 may be bent in different directions or deformed to widen the position pins 24, thus preventing each lead 14 from escaping the corresponding positioning pin 24. The deformation may locate at least a portion of the positioning pin 24 over a metal portion of the lead 14, adjacent the alignment hole 16. The deformation can provide mechanical robustness to the component assembly 99 and prevent the differential movement of the component 10 and the support 20, for example as a result of vibration.
[0152] In optional step 140, the positioning pins 24 may optionally be soldered to the leads 14, for example to provide electrical connections between the lead 14 and the wire 60, and optionally the positioning pin 24. The solder 50 can also provide additional mechanical strength to the physical connection between the component 10 and the support 20.
[0153] In operation, power may be provided to a wire 60 and hence to a lead 14 and circuit 18. Signals from the circuit 18 are sent through another lead 14 and wire 60 to a controller (not shown in the figures).
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[0155] The component 10 shown in
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[0157] The component of
[0158] The component 10 may comprise a plurality of tabs or test pins 14C located substantially halfway between proximal portions of the elongated leads 14A. These tabs or test pins 14C may have very small dimensions, for example have an external length of about 0.7 mm and an external width of about 0.3 mm, while allowing distal portions of the elongated leads to be spaced apart by about 2.5 mm from centerline to centerline. If the test pins are present (as shown in
[0159] The recesses 13 of the housing 12 may overlap at least a portion 14D of the lead frame and/or of the elongated leads in an overlapping area 11. An inner portion of the elongated leads 14A may be broadened or widened to create such an overlap (see
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[0165] The protrusions 32 are preferably deformed against an inclined wall of the component 10, and in such a manner that at least a portion of the protrusions enters the space defined by the recesses 13, for clamping the component 10. A component assembly (not shown) where the component is clamped in this manner, is also envisioned.
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[0171] As is understood by those skilled in the art, the terms over, under, above, below, beneath, and on are relative terms and can be interchanged in reference to different orientations of the layers, elements, and substrates included in the present invention. For example, a first layer, element, or structure on a second layer, element, or structure in some embodiments means a first layer, element, or structure directly on and in contact with a second layer, element, or structure. In other embodiments, a first layer, element, or element on a second layer, element, or structure can include another layer there between. Additionally, on can mean on or in or in contact with or directly on.
[0172] Having described certain embodiments, it will now become apparent to one of skill in the art that other embodiments incorporating the concepts of the disclosure may be used. Therefore, the invention should not be limited to the described embodiments, but rather should be limited only by the spirit and scope of the following claims.
[0173] Throughout the description, where apparatus and systems are described as having, including, or comprising specific elements, or where processes and methods are described as having, including, or comprising specific steps, it is contemplated that, additionally, there are apparatus, and systems of the disclosed technology that consist essentially of, or consist of, the recited elements, and that there are processes and methods according to the disclosed technology that consist essentially of, or consist of, the recited processing steps.
[0174] It should be understood that the order of steps or order for performing certain action is immaterial so long as the disclosed technology remains operable. Moreover, two or more steps or actions in some circumstances can be conducted simultaneously. The invention has been described in detail with particular reference to certain embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.