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MXPA96003551A - Assembly of armor and protective methodsposed to be used in a decommunicac device - Google Patents

Assembly of armor and protective methodsposed to be used in a decommunicac device

Info

Publication number
MXPA96003551A
MXPA96003551A MXPA/A/1996/003551A MX9603551A MXPA96003551A MX PA96003551 A MXPA96003551 A MX PA96003551A MX 9603551 A MX9603551 A MX 9603551A MX PA96003551 A MXPA96003551 A MX PA96003551A
Authority
MX
Mexico
Prior art keywords
consecutive
shield
connections
garrisons
row
Prior art date
Application number
MXPA/A/1996/003551A
Other languages
Spanish (es)
Other versions
MX9603551A (en
Inventor
W Matuszewski Scott
W Lee Jin
f hannon John
J Kimbell Martin
Original Assignee
Motorola
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/517,496 external-priority patent/US5633786A/en
Application filed by Motorola filed Critical Motorola
Publication of MX9603551A publication Critical patent/MX9603551A/en
Publication of MXPA96003551A publication Critical patent/MXPA96003551A/en

Links

Abstract

The present invention relates to a shield assembly for protecting an electronic circuit placed on a substrate, the shield assembly characterized by: a plurality of consecutive lugs placed on the substrate around the electronic circuit, and a first shield having a first plurality of consecutive connections for clamping to the plurality of consecutive garrisons, at least some of the first plurality of consecutive connections to the non-consecutive ones of the plurality of consecutive garritions being held.

Description

ASSEMBLY OF ARMORING AND APPROPRIATE PROTECTION METHOD FOR USE IN A COMMUNICATION DEVICE Background of the Invention 1. Field of the Invention The present invention relates generally to an electrical assembly and more particularly to an assembly to protect from interference to an electronic circuit placed on a substrate. 2. Description of the Related Art Modern electronic equipment includes electrical circuits mounted on a substrate that is sensitive to electromagnetic interference (EMI) and radio frequency interference (RFI) (interference collectively). Interference can originate from internal sources within electronic equipment or from sources of interference. Interference can cause the degradation or total loss of important signals returning to inefficient or inoperable electronic equipment. To minimize interference, the electrically conductive material is interposed between the portions of the electrical circuit. For manufacturing purposes, this material is worked in multiple wrappings or shields that make up the electrical circuits. These shields are fastened, typically through soldering, to grounded gaskets placed both on the substrate and around the electrical circuits that generate the interference as well as around the electrical circuits that are susceptible to interference. Many times, the shields are held in contiguity. Techniques for adjacently securing such shields include the ratio of double garrisons (a separate garrison for each shield) and the proportion of a single garrison that is shared for both shields. However, double liners consume an unacceptable amount of physical space. For example, assuming that each lining is 1.00 mm in width and that each lining is separated by a 0.26 mm space to ensure reliable clamping, double linings require a substrate area of at least 2.26 mm. Unfortunately, it has been found that a single shared garrison is too unstable. During fastening of the shields to a shared lining, such as the aforementioned 1.00 mm lining, the weld exhibits a capillary pull and migrates from the lining onto one or both of the shields. This leaves an insufficient amount of welding in the lining-shielding interconnection, thereby avoiding reliable fastening. When such a fitting is shared, the shields also tend to twist and even to move out of the lining during fastening. As portable electronic equipment becomes increasingly smaller and the components of electrical circuits are placed closer together, the physical space available for protection is greatly reduced. Therefore, what is needed is a shield assembly and protection method that consumes as little space as possible and provides safe, reliable, and easy-to-manufacture interconnections. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a radio communication system that includes a portable electronic device employing a protective assembly; Figure 2 illustrates an enlarged perspective view of the protection assembly of Figure 1; Figure 3 illustrates a consolidated perspective view of the protection assembly of Figure 1; and Figure 4 illustrates an enlarged fragmentary plan view of the protective assembly of Figure 3. Detailed Description of Preferred Modes A protective assembly for protecting an electronic circuit placed on a substrate includes fittings and shielding. The fittings are placed on the substrate around the electronic circuit. The shield includes connections for fastening to the fittings. The shield is attached to the fittings in such a way that some of the lead wires, which are staggered, are attached to the garrisons in a non-consecutive manner. An additional shielding that alternatively includes tiered connections can be attached adjacent to the previously clamped shield. This is accomplished by holding the alternately staggered connections of the additional shield to those fittings that are between the linings secured to the previously attached shield. Figure 1 illustrates a radio communication system that includes a portable electronic device, specifically, a portable radiotelephone 100 that employs a protection assembly 102. The portable radiotelephone 100 includes a housing 104, an antenna 106 carried in the housing 104, a substrate 107 positioned within the housing 104, and a transceiver circuit 108 positioned on the substrate 107 beyond the shield assembly 102. A speaker (not shown), a microphone (not shown), a keyboard (not shown), and a display (not shown) are placed on a front side of the housing 104 that is hidden from view in Figure 1. The portable radiotelephone 100 is energized by a detachable battery 110 attached to the housing 104. The portable radiotelephone 100 operates in a communications system by radiotelephone when communicating with a fixed-site transceiver 112 through radio frequency (RF) signals 114. The transceiver of the site or fixed 112 transmits the RF signals 114 to a radio-coverage area populated by the portable radiotelephone 100. The antenna 106 transduces the RF signals 114 to electrical RF reception signals and couples the electrical RF reception signals to the transceiver circuit 108. The transceiver circuit 108 transforms the electrical RF reception signals into data reception signals which are then emitted to the user as an audible voice through the speaker and as operational information through the display. The voice and data entered by the user through the keyboard and the microphone, respectively, are coupled to the transceiver circuit 108 as data transmission signals. The transceiver circuit 108 converts the data transmission signals to electrical RF transmission signals that are transduced by the antenna 106 and transmitted to the fixed site transceiver 112 as the RF signals 114. The protection assembly 102, which only partially shown in Figure 1, it includes a plurality of shields 116 and a plurality of lugs 118 placed on the substrate 107. The plurality of shields 116 are electrically connected to the plurality of lugs 118 to substantially enclose the transceiver circuit 108. The protection assembly 102 prevents interference, such as electromagnetic interference (EMI) and radio frequency interference (RFI), from being irradiated further or penetrating through the plurality of shields 116 and interfering with the operation of the transceiver circuit 108 at for example, to degrade the aforementioned electrical RF reception and transmission signals as well as also the signals of reception and transmission of data. Although illustrated in a portable radiotelephone, the shield assembly 102 also finds application in virtually any electronic device, including computers, cordless telephones, two-way radios, pagers, personal digital assistants, and the like. Figure 2 illustrates an exploded perspective view of the shield assembly 102 wherein the plurality of shields 116 are shown spaced from, and projected above, the plurality of lugs 118. In a preferred embodiment, the shield assembly 102 includes shields 200-205. Each of the shields 200-205 includes a flat upper surface and substantially orthogonal side portions that extend downward therefrom and terminate at a lower edge periphery. A plurality of connections extend downwardly from the lower edge periphery in planar relation to the side portions. The plurality of connections is located at predetermined locations around the lower edge periphery beyond the side portions. The 200-205 shields are preferably manufactured, using a known technique of progressive stamping or a known technique of displaceable tool, from a thin sheet of 0.05 mm to 0.30 mm of a nickel-silver alloy, a steel rolled with tin, or other suitable material. The side portions are then folded to a position based on the maximum height of the portion of the transceiver circuit 108 that is to be protected. Depending on the type of the components comprising this portion of the transceiver circuit 108, the height of the side portions could be less than 3.0 mm. The plurality of fittings 118 is installed around the transceiver circuit 108 in rows. The length of the rows corresponds to the dimensions of the shields 200-205 and, specifically, to the lengths of their side portions. The plurality of rows extend both transversely and longitudinally over the substrate 107 and, in a preferred embodiment, divide the transceiver circuit 108 into circuit portions 206-211. The circuit portions 206-211 include a portion of the transceiver circuit 108, which could be, for example, an oscillator circuit, a microstrip transmission line, or a power amplifier circuit. Such a division increases the manufacturing capacity, ease of repair, and separates the interference produced by the circuitry of the sensitive circuitry. The plurality of gaskets 118, which preferably comprise copper gaskets, are manufactured using known joining and laminating techniques during the construction of the substrate 107, which preferably comprises printed board material, such as polyimide or industrial glass fiber retardant. Ignition based on epoxy (G10-FR4). The plurality of gaskets 118 is electrically coupled to a ground plane (not shown). In the preferred embodiment, the plurality of gaskets 118 are 1.0 mm in amplitude in order to ensure an effective metallurgical connection between the plurality of shield connections 200-205 and the plurality of gaskets 118. However, it will be recognized that this amplitude of 1.00 mm could vary according to, for example, variations in the thickness of the plurality of connections. Each of the plurality of gaskets 118 is preferably separated from one another by a welded mask barrier or uninsulated substrate material of at least 0.26 mm. The length of each of the plurality of gaskets 118 is slightly greater than the length of the corresponding plurality of connections of the shields 200-205. The shield assembly 102 is preferably assembled through an automated assembly process. Initially, the substrate 107 is subjected to a shielding process that deposits a predetermined amount of solder paste on the plurality of gaskets 118. To ensure a firm hold, the amount of solder (and the size of the plurality of gaskets 118) must be sufficient to allow it to be welded "in line" or to adhere on both sides of each of the plurality of connections of the shields 200-205 during the reflow. In the preferred embodiment, the solder paste is a tin-lead-silver alloy. Next, shields 200-205 are decreased to enclose circuit divisions 206-211, respectively, as telegraphed along lines 212. The plurality of shield connections 200-205 are clutched with the plurality of fittings 118, preferably by means of an automated partial positioning machine. Unlike large single-piece shields covering an entire substrate, the 200-205 shields are dimensioned in a manageable manner to allow automated positioning by the same large-part placement machine that could, for example, auto-locate an amplifier. power or a microprocessor. After positioning the shield 200 to enclose the circuit division 206, a complete set of connections 214 of the shield 200 engage all of the plurality of corresponding fittings 118 of the row 216. The shield 200 also includes a first set of stepped connections 218 that are visible through a separate portion of the upper surface of the shield 200. The first set of tiered connections 218 is separated and engaged only approximately every two, or non-consecutive, corresponding to the plurality of fittings 118 of row 220. Such a non-consecutive clutch allows shields 200-205 to share a common row when are placed adjacently. For example, after placing the shield 201 to enclose the division of the circuit 207, the shield 201 is positioned adjacent to the shield 200 and includes a second set of stepped connections 222 that separate to engage the remainder of the plurality of flanges without clutch 118 of row 220. Shield 201 includes a third set of stepped connections 224 that are visible through a portion spaced from the upper surface of shield 201. The third set of stepped connections 224 is separated to engage only approximately every two of the plurality of garrisons 118 of row 226. After placing shield 202 to enclose circuit division 208, shield 202 is positioned adjacent to shielding 201 and includes a fourth set of stepped connections 228 which is they separate to clutch the rest of the fittings of the plurality without clutch 118 of row 226. Similarly ar, shields 200 and 203 share row 230, shields 202 and 203 share row 232, shields 202 and 204 share row 234, and shields 203 and 205 share row 236. After such a clutch, the assembly of shield 102 is heated by reflux to a temperature that is sufficient to melt the solder paste to a liquid state. The liquid weld in line on both sides of the only connection that occupies each of the plurality of gaskets 118 and forms an effective metallurgical interconnection between them. In the preferred embodiment, the shield assembly 102 is heated by reflux for approximately 660 s. During this period of time, the temperature of the shield assembly 102 increases to approximately 218 ° C. The protective assembly 102 is shown completely assembled in Figure 3. The assemblies 200-205, which enclose the circuit divisions 206-211, are grounded and conductive, thereby preventing the EMI and the RFI from radiating beyond them or penetrate through them to interfere with the portions of the transceiver circuit 108 beyond them. The plurality of connections of the shields 200-205 and the plurality of linings are held in a one-to-one correspondence. Each of the plurality of connections is isolated in its own garrison. The shields 200-205 include a plurality of holes to allow visual inspection of the portions of the transceiver circuit 108 below them. Such holes are small enough (one-eighth of wavelength or less at the highest frequency for which protection is necessary) to prevent the passage of the EFI or RFI interference. The size of the holes of the shields 200-205 may vary based on the sensitivity of the portion of the transceiver circuit 108 below them. For more sensitive circuitry, the diameter of the holes becomes smaller. The distal spacings between the plurality of connections and the openings between the lower edge periphery of the shields 200-205 and one of those passed over the plurality of lugs 118 are similarly constricted. The non-consecutive clutch of a row of liners shared by the plurality of connections of two or more adjacent shields is clearly shown in Figure 4, to which it shows an enlarged illustration of the fragment 300 of the protective assembly 102 of Figure 3. For clarity, the shields 200-204 are illustrated in dotted line and the terrestrial pattern created by the plurality of connections is illustrated in a thick line. The shields are placed so that their adjacent side portions are outside a center or middle line of the shared row. For example, the shield 200 is placed just to the left of the middle line of the row 220 and the shield 201, which is adjacent to it, is placed just to the right of the middle line of the row 220. The plurality of stepped connections of each of the shields alternatively clutches the trimmings of the shared row in a stepped terrestrial pattern. For example, the first and second connections 401, 402 of the first set of stepped connections 218 of the shield 200 engage the linings, second and fourth, 421, 423 of the row 220 just to the left of the middle line thereof. The connections, first, second and third, 410, 411, 412 of the second set of tiered connections 222 of the shield 201 engage the linings, first, third and fifth, 420, 422 and 424 of the row 220 just to the right of the line average of them. Although illustrated as substantially rectangular with the linear side portions, it will be recognized that the shields 200-205 could be formed in other geometric configurations, such as circular or semicircular shapes including curvilinear side portions. Although the rows of the plurality of garnishes 118 are illustrated as straight lines, it will be recognized that the term "row" as used herein refers to "a single garnish or multiple garnishes placed one after another" and thus , garrisons that are outside a straight line and garrisons installed in curvilinear patterns would be included. The armor assembly and method of protection set forth herein require a single row of linings to effect clamping of adjacent shields. Adjacent shields are outside the middle line of the single row and include stepped connections that alternate attachment to the single row fittings. The present shield assembly performs a reduction of more than 50% in the amount of substrate space that was previously required for protective assemblies that require double rows of fittings to hold the shields adjacently. The 1-to-1 correspondence between the shield connections and the fittings of the current shield assembly avoids the reliability and field kink problems prevalent in previous assemblies that hold adjacent shields to the same lining.

Claims (10)

  1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and therefore the property described in the following claims is claimed as property. A shield assembly (102) for protecting an electronic circuit (108) positioned on a substrate (107), the shield assembly characterized by: a plurality of consecutive lugs (118) placed on the substrate around the electronic circuit; and a first shield (200) having a first plurality of consecutive connections (218) for clamping to the plurality of consecutive garrisons, at least some of the first plurality of consecutive connections (401, 402) being held to the non-consecutive ones of the plurality of consecutive garrisons (421, 423). A shield assembly according to claim 1, characterized by a second shield (201) having a second plurality of consecutive connections (222) for clamping to the plurality of consecutive garrisons, at least some of the second plurality of connections being held consecutive (410, 411, 412) to the garrisons (420, 422, 424) among the non-consecutive ones of the plurality of consecutive garrisons. A shield assembly according to claim 2, characterized in that the non-consecutive ones of the plurality of consecutive garrisons and the garrisons between the non-consecutive ones of the plurality of consecutive garrisons form a single row (220). A shield assembly according to claim 2, characterized in that at least some of the first plurality of consecutive connections and at least some of the second plurality of consecutive connections are staggered around a center of the non-consecutive ones of the plurality of consecutive garrisons. and the garrisons between the non-consecutive ones of the plurality of consecutive garrisons. A shield assembly according to claim 1, characterized in that at least some of the first plurality of consecutive connections are outside a center of the first set of non-consecutive ones of the plurality of consecutive garrisons. A shield assembly according to claim 1, characterized in that the first plurality of consecutive connections of the first shield are substantially orthogonal to the plurality of consecutive flanges. 7. A shield assembly (201) for protecting an electronic circuit (108) positioned on a substrate (107), the shield assembly characterized by: a plurality of consecutive linings (118) -l placed on the substrate around the electronic circuit, at least some of the plurality of consecutive garnishes forming a row (220); a first shield (200) having at least a first edge, the at least one first edge includes at least one first connection (401, 402) that extends downwardly therefrom and is secured to a first set of gaskets. the row (421, 423); and a second shield (201) having at least a second edge, the at least one second edge includes at least one second connection (410, 411, 412) extending down therefrom and is attached to a second set of row fittings (420, 422, 424) so that the at least one first edge of the first shield and the at least one second edge of the second shield are adjacent to each other. 8. A shield assembly according to claim 7, characterized in that the row consists of linings of the first set of alternate linings with linings of the second set of liners. 9. A shield assembly according to claim 7, characterized in that the at least one first connection and the at least one second connection are staggered around a center of the row. 10. A communication device (100) having a housing (104), the communication device is characterized by: a substrate (107) positioned within the housing; a transceiver circuit (108) placed on the substrate; a plurality of consecutive garrisons (118) placed on the substrate around the transceiver circuit, at least some of the plurality of consecutive garrisons forming a row (220); a first shield (200) having at least a first edge, the at least one first edge includes at least one first connection (401, 402) that extends downwardly therefrom and is secured to a first set of gaskets. the row (421, 423) outside a center thereof, the at least one first connection is substantially orthogonal to the first set of row fittings; and a second shield (201) having at least a second edge, the at least one second edge includes at least one second connection (410, 411, 412) extending down therefrom and is attached to a second set of row fittings (420, 422, 424) outside a center thereof, the at least one second connection is substantially orthogonal to the second set of linings of the row and substantially parallel to the at least one first connection, the second set of trimmings differs from the first set of trimmings, the at least one first edge of the first shield and the at least one second edge of the second shield being adjacent to each other. ASSEMBLY OF ARMOR AND APPROPRIATE PROTECTION METHOD FOR USE IN A COMMUNICATION DEVICE Summary of the Invention A protective assembly (102) for protecting an electronic circuit (108) placed on a substrate (107) that includes fittings (118) and a shielding (200). The gaskets (118) are placed on the substrate (107) around the electronic circuit (108). The shield (200) includes connections (214, 218) for attachment to the linings (118). The shield (200) is attached to the gaskets (118) in such a way that some of the connections (218), which are staggered, are fastened to the gaskets (118) in a non-consecutive manner. An additional shield (201) including alternately staggered connections (222) may be attached adjacent to the previously secured shield (200). This is accomplished by holding the alternately staggered connections (222) of the additional shield (201) to those linings that are between the linings secured to the previously attached shield (200).
MXPA/A/1996/003551A 1995-08-21 1996-08-21 Assembly of armor and protective methodsposed to be used in a decommunicac device MXPA96003551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08517496 1995-08-21
US08/517,496 US5633786A (en) 1995-08-21 1995-08-21 Shield assembly and method of shielding suitable for use in a communication device

Publications (2)

Publication Number Publication Date
MX9603551A MX9603551A (en) 1997-07-31
MXPA96003551A true MXPA96003551A (en) 1997-12-01

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