BRIEF DESCRIPTION OF THE DRAWINGS
These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which:
FIG. 1 is a perspective view of a terminal assembly in accordance with an embodiment of the present invention attached to a loudspeaker;
FIG. 2 is an exploded perspective view of the terminal assembly including the main housing, a circuit board, a back cover, a top cover, a jumper, and a pair of fuses in accordance with an aspect of the present invention;
FIG. 3 is a frontal perspective view of a main housing of the terminal assembly;
FIG. 4 is a rear plan view of a circuit utilized in the terminal assembly of the present invention, illustrating the various circuit regions;
FIG. 5 is a frontal view of the terminal assembly with a jumper attached thereto in a first orientation to connect the loads in a series relationship;
FIG. 6 is a rear view of the circuit showing circuit regions shorted by the jumper to connect a pair of loads in series;
FIG. 7 is a schematic diagram of the circuit with the loads connected in series;
FIG. 8 is a frontal view of the terminal assembly with a jumper attached thereto in a second orientation to connect the loads in a parallel relationship;
FIG. 9 is a rear view of the circuit showing circuit regions shorted by the jumper to connect the pair of loads in parallel;
FIG. 10 is a schematic diagram of the circuit with the loads connected in parallel;
FIG. 11 is a frontal view of the terminal assembly with the jumper removed from the circuit;
FIG. 12 is a frontal view of the circuit with the jumper removed from the circuit; and
FIG. 13 is a schematic diagram of the circuit with the loads connected to independent signal sources.
Common reference numerals are used throughout the drawings and the detailed description to indicate the same elements.
DETAILED DESCRIPTION
The detailed description set forth below in connection with the appended drawings is intended as a description of the presently preferred embodiment of the invention, and is not intended to represent the only form in which the present invention may be constructed or utilized. It is understood that the use of relational terms such as first and second, top and bottom, and the like are used solely to distinguish one from another entity without necessarily requiring or implying any such actual relationship or order between such entities.
With reference to FIG. 1, in accordance with an aspect of the present invention, there is provided a terminal assembly 10 that is attachable to a loudspeaker 12. The loudspeaker 12 is preferably of the moving-coil type, where a diaphragm 14 is suspended from a basket 16 that is defined by an open top rim 18 and a base portion 20. The diaphragm 14 is attached to an annular flexible surround 22, which is also attached to the top rim 18.
For enhancing the decorative appearance of the face of the loudspeaker 12, there is provided a grille 24. Optionally, the grille 24 may include a mesh-like element that covers the entire face of the loudspeaker 12. However, as understood in the art, the grille 24 need not include such an element, and any decorative piece attached to the top rim 18 may be so referenced. The grille 24 may include various ornamental designs that are molded, engraved, painted, or otherwise impressed thereupon. In addition to its decorative functions, the grille 24 may cover various fasteners 26 used to attach the loudspeaker 12 to a speaker enclosure or other like structure.
As is well known in the art, in a moving coil loudspeaker, the diaphragm 14 is coupled to a cylindrical bobbin that has one or more voice coils wound thereon. Electrical current representative of an audio signal is passed through the voice coil winding and interacts with the magnetic fields produced by a permanent magnet, causing the bobbin and the diaphragm to vibrate in accordance with the signal. The voice coil winding includes a positive lead end and a negative lead end, both of which must be connected to the audio signal source. Preferably, the loudspeaker 12 for use in conjunction with a preferred embodiment of the terminal assembly 10 has dual voice coils, that is, there are two separate windings on the bobbin, with a first set of positive and negative lead ends of the first voice coil, and a second set of positive and negative lead ends of the second voice coil. As will be described in further detail below, the first and second voice coils may be connected to each other in a series relationship, as well as in a parallel relationship with respect to a single source, such as a mono amplifier. It is also contemplated that the first and second voice coils may be driven by independent signal sources, as in the case of a stereo amplifier with left and right signals.
Generally, the terminal assembly 10 serves as an interface between the leads of the voice coil and the leads from the audio signal source, and is preferably attached to the base portion 20 of the basket 16. While FIG. 1 illustrates the terminal assembly 10 being attached to the loudspeaker 12, one of ordinary skill in the art will appreciate that it may be attached to any other suitable location such as speaker enclosures, stereo receivers, and the like. Further, while the terminal assembly 10 is described in relation to the loudspeaker 12 and connections to the voice coils and other components thereof, it will be understood that they are presented by way of example only and not of limitation. The terminal assembly 10 may interconnect any other suitable electrical load and source in the same manner as will be further detailed below.
With reference now to FIG. 2, there is shown the terminal assembly 10 in accordance with one aspect of the present invention, including a circuit board 28 configured to be enclosed within a main housing 30. The completed terminal assembly 10 further includes a back cover 32 and a top cover 34. In further detail as shown in FIG. 3, the main housing 30 is defined by a front face 36, a left wall 38, a right wall 40, and a bottom wall 42.
According to one embodiment of the present invention, the front face 36 defines a first source positive input port 44a and a first source negative input port 44b that are collectively referred to as first source input ports 44. In this embodiment, the bottom wall 42 further defines a second source positive input port 46a and a second source negative input port 46b that are collectively referred to as second source input ports 46. It is understood that the first and second source input ports 44, 46 extend into the interior of the main housing 30 and have the same diameter. While shown as having a cylindrical configuration, it will be appreciated that any other suitable shape may be readily substituted without departing from the scope of the present invention. Additionally, the front face 36 defines a first source positive terminal access port 48a and a first source negative terminal access port 48b, collectively referred to as first source terminal access ports 48. The front face 36 also defines a second source positive terminal access port 50a and a second source negative terminal access port 50b, collectively referred to as second source terminal access ports 50. As described above in relation to the first source and second source inputs 44, 46, the first source and second source terminal access ports 48, 50 have generally cylindrical configurations, with each one having the same diameter.
With further reference to FIG. 2, the circuit board 28 has attached thereto a positive first source terminal 52a and a negative first source terminal 52b, collectively referred to as first source terminals 52, as well as a positive second source terminal 54a and negative second source terminal 54b, collectively referred to as second source terminals 54. In one preferred embodiment, each of the first source and second source terminals 52, 54 are generally defined by a cube configuration, with first cylindrical bores 56 extending therethrough, and second cylindrical bores 58 extending perpendicularly to the respective one of the first cylindrical bores 56. The first cylindrical bores 56 of each of the first and second source terminals 52, 54 are coaxial with the first source and second source input ports 44, 46, while the second cylindrical bores 58 of each of the first source and second source terminals 52, 54 are coaxial with the first source and second source terminal access ports 48, 50. The second cylindrical bores 58 may include helical grooves therein, with clamping bolts 60 threaded therethrough. The wires from the audio signal source are understood to be inserted through the first source and second source input ports 46, 48, and through the first source and second source terminals 52, 54. Such leads may be secured to the first and second source terminals 52, 54 by tightening the clamping bolts 60 with a compatible tool inserted through the first source and second source terminal access ports 48, 50.
An exemplary embodiment of the terminal assembly 10 in which main body 30 defines the first source and second source input ports 44, 46, and the first source and second source terminal access ports 48, 50 to be compatible with the first source and second source terminals 52, 54 has been described. It will be recognized by one of ordinary skill in the art, however, that any other suitable source terminals may be utilized without departing from the scope of the present invention. It will also be recognized that the main body 30 may have alternative configurations to accommodate such source terminals. In other words, the configuration of the main body 30, particularly as it relates to the first source and second source input ports 44, 46 and the first source and second source terminal access ports 48, 50 is dependent on the configuration of the first source and second source terminals 52, 54, and vice versa. Changes to one may necessitate an accommodating change to the other. By way of example only, the first source and second source terminals 52, 54 may include biasing members incorporated therein for frictionally retaining the wires from the signal source. In such a configuration, there would be no need for the first source and second source terminal access ports 48, 50. Along these lines, it is understood that such wires may have bare ends that are engaged to the first source and second source terminals 52, 54, or may have various terminations attached thereto such as banana plugs and the like.
Referring to FIGS. 2 and 3, the main body 30 defines a first source fuse slot 62 and a second source fuse slot 64 to provide access to a first set of fuse contacts 66 and a second set of fuse contacts 68. In a preferred embodiment, the first source fuse slot 62 is located alongside the second source fuse slot 64, and in combination, extends substantially across the main body 30. The first set of fuse contacts 66 includes a source end fuse contact 66a and a load end fuse contact 66b, and the second set of fuse contacts 68 includes a source end fuse contact 68a and a load end fuse contact 68b. The particular naming conventions of the respective ones of the first and second set of fuse contacts 66, 68 will be further considered below. By way of example only and not of limitation, the respective ones of the first and second set of fuse contacts 66, 68 are all extruded U-shaped members with opposed gripping elements biased towards the center thereof. The first and second sets of fuse contacts 66, 68 are configured to mate with first and second fuses 70 and 72, respectively, and are attached to the circuit board 28. The first and second fuses 70, 72 have identical configurations, and as such, each includes a pair of spaced electrodes 74 and 76 adapted to a body 78. The body 78 includes a rectangular flange portion 80 defining a top surface 82. The spacing distance between the electrodes 74 and 76 is approximately the same as the spacing distance between the source end fuse contact 66a and the load end fuse contact 66b, and between the source end fuse contact 66a and the load end fuse contact 68b. It will be recognized that the first and second fuses 70, 72 may have various physical dimensions, and may of any automotive type with a configuration that conforms to industry standards such as the Mini (10.92×16×3.81 mm), ATO® (19.05×18.54×5.08 mm) or Maxi (29.21×34.29×8.89 mm). Within the body 78 is a shorting wire (not shown) electrically connecting the electrodes 74 and 76. The shorting wire is configured to break the electrical connection between the electrodes 74 and 76 upon over-current. It is understood that the over-current rating, or the amperage at which the short will be broken, may be varied. Specifics relating to how the first and second fuses 70, 72 protect the loudspeaker 12 will become more apparent below. As will be understood, the electrodes 74 and 76 is constructed of electrically conductive material such as metal, while the body 78 is constructed of plastic or other like non-conductive material. As indicated above, the first fuse 70 is attached to the terminal assembly 10 through the first source fuse contact slot 62, and the second fuse 72 is attached to the terminal assembly 10 through the second fuse contact slot 64. In a first preferred embodiment as shown in FIG. 1, it is contemplated that upon engagement to the first and second set of fuse contacts 66, 68, the top surface 82 and the flange portion 80 of the first and second fuses 70, 72 extends beyond the front face 36 such that it may be readily removed. In another preferred embodiment, it is contemplated that upon engagement to the first and second sets of fuse contacts 66, 68, the top surface 82 of the first fuse 70 is flush with front face 36 of the main housing 30 to reduce the profile of the terminal assembly 10. In both of the aforementioned embodiments, the main housing 30 also defines a pair of opposed partial frusto-spherical recesses 84 for both the first source fuse slot 62 and the second source fuse slot 64. It is understood that the recesses 84 makes the flange portion 80 of both of the first and second fuses 70, 72 accessible for a user's fingers to grip. Thus, the first fuse 70 or the second fuse 72 may be easily replaced as necessary. Alternative configurations of the recesses 84 besides the aforementioned partial frusto-spherical shape are also deemed to be within the scope of the present invention. One of ordinary skill in the art will readily appreciate such alternatives and incorporate the same into the main housing 30.
The main housing 30 also defines a jumper access slot 86 that extends substantially across the front face 36 and into the interior of the main housing 30. Further, the jumper access slot 86 provides access to a set of jumper contacts 90 attached to the circuit board 28. As illustrated in FIG. 2, the set of jumper contacts 90 includes a first jumper contact 91, a second jumper contact 92, a third jumper contact 93, a fourth jumper contact 94, and a fifth jumper contact 95, each being configured to receive a jumper 96. As utilized herein, the reference numerals 91-95 are understood to refer to the specific one of the jumper contacts, while the reference numeral 90 is understood to refer broadly to all of the jumper contacts. It is contemplated that the jumper contacts 90 have the equivalent structure of the extruded U-shaped member as described in relation to the first and second set of fuse contacts 66, 68 above.
The jumper 96 includes a non-conductive body 98, with a first conductive prong 100 and a second conductive prong 102 fixed thereto in a spaced relationship. More particularly, the first conductive prong 100 and the second conductive prong 102 are spaced asymmetrically about a center 104 of the non-conductive body 98. The non-conductive body 98 is defined by a proximal end 106 and a distal end 108, and preferably, the outer edge of the first conductive prong 100 is in the vicinity of the proximal end 106 while the outer edge of the second conductive prong 102 is more centrally disposed. In further detail, the first and second conductive prongs 100, 102 have widths to span and electrically connect at least a pair of adjacent ones of the jumper contacts 90. Further details pertaining to the function of the jumper 96 and as it relates to the jumper contacts 90 will be described in further detail below.
The circuit board 28 also includes a first set of load terminals 110 and a second set of load terminals 112. The first set of load terminals 110 includes a first positive load terminal 110a and a first negative load terminal 110b, and the second set of load terminals 112 includes a second positive load terminal 112a and a second negative load terminal 112b. As illustrated in FIG. 2, the first and second set of load terminals 110, 112 all have a cube-shaped configuration with a wire passage hole 114. As indicated above, it is contemplated that the terminal assembly 10 is permanently attached to the loudspeaker 12, and so the connections from the first and second set of load terminals 110, 112 to the lead ends of the first and second voice coils, respectively, are likewise permanent. For example, the lead ends of the first and second voice coils may be soldered onto the first and second set of load terminals 110, 112.
The main housing 30 defines an upper wall 31 that includes a set of lead access holes 116. Preferably, each of the lead access holes is coaxial with the wire passage holes 114 on the first and second set of load terminals 110, 112, such that the leads of the first and second voice coils are passed therethrough. Such leads may remain hidden with the cover 34, and passed through the rear of the terminal assembly 10. For attaching the top cover 34 to the main housing 30, the upper wall 31 defines top cover mating notches 117 configured to receive mating tabs 35. As will be appreciated, the mating tabs 35 may be inserted into the mating notches 117 with the top cover 34 at a near a perpendicular angle to the upper wall 31, and locked into place by rotating it about the same. The top cover 34 further includes locking wedges 37 that are engageable to the main housing 30. It is understood that the mating tabs 35 and the locking wedges 37 are of a unitary construction with the top cover 34.
As indicated above, the circuit board 28 is held within the interior of the main housing 30. The back cover 32 includes a pair of opposed semi-cylindrical support members 118 extending perpendicularly to the back cover 32, and the interior portions 120 of the support members 118 are configured to receive fasteners 122 that secure the back cover 32 to the main housing 30. The back cover 32 is mounted between lip portions 33 of the main housing 30, that is, the exterior face 126 of the back cover 32 is generally co-planar with the exterior surface 128 of the lip portion 33. Additionally, the circuit board 28 includes semi-circular notches 130 that receive the fasteners 122, and end surfaces 132 of the support members 118 abut against the circuit board 28 to secure the same to the main housing 30. It will be appreciated that this keeps all of the respective terminals, contacts, and the like in proper alignment with the slots and ports of the main housing 30 as described above.
With reference to FIG. 4, the reverse side of the circuit board 28, that is, the side without the contacts and the terminals will be detailed. The circuit board 28 includes conductive plating laminated on an underlying, non-conductive substrate. One of ordinary skill in the art will appreciate that the conductive plating is a sheet of copper or other like material, and the substrate may comprise phenolic resin, fiberglass reinforced with epoxy resin, ceramics, and so forth. Prior to attachment of the contacts and the terminals, the bare circuit board 28 is etched to divide the same into unconnected circuit regions as will be further detailed below. More particularly, the conductive plating on the regions of the circuit board 28 for etchings 134 is removed so that the non-conductive substrate is exposed and there are no mechanical/electrical connections across the same. The techniques involved in producing the etchings 134 are well known in the art, and any such alternative techniques may be readily substituted without departing from the scope of the present invention.
The circuit board 28 is comprised of a first circuit region 141, a second circuit region 138, a third circuit region 143, a fourth circuit region 144, a fifth circuit region 145, a sixth circuit region 146, and a seventh circuit region 147 each being separated by the etchings 124. As indicated above, each of the first through seventh circuit regions 141-147 are conductive, and is an electrical junction with respect to the components attached thereto. However, the first through seventh circuit regions 141-147 are electrically isolated with respect to each other absent connections made by the first and second fuses 70, 72 and the jumper 96. In further detail as related to the arrangement of the jumper contacts 90, the first through fifth jumper contacts 91-96 are laterally spaced along the circuit board 28 with at least one of the jumper contacts 91-96 being in electrical communication with one of the first and second set of load terminals 110, 112. The first circuit region 141 includes the first positive source terminal 52a and the first source end fuse contact 66a. The second circuit region 142 includes just the first jumper contact 91. The third circuit region 143 includes the first positive load terminal 110a, the second jumper contact 92, and the first load end fuse contact 66b. The fourth circuit region 144 includes the first negative source terminal 52b, the fourth jumper contact 94, and the first negative load terminal 110b. The fifth circuit region 145 includes the second positive source terminal 54a, the third jumper contact 93, and the second positive load terminal 112a. The sixth circuit region 146 includes the second negative load terminal 112b, the fifth jumper contact 95, and the second load end jumper contact 68b. The seventh circuit region 146 includes the second negative source terminal 54b and the second source end fuse contact 68a.
With the understanding imparted by the detailed explanation of the layout of the circuit board 28, the connections made by the jumper 96 to link the aforementioned circuit regions and how such connections enable parallel or series couplings of the first and second voice coils will now be considered.
With reference to FIGS. 5, 6, and 7, the first negative load terminal 110b is electrically coupled to the second positive load terminal 112a to connect a first load 150 and a second load 152 in a series relationship with respect to an audio signal source 154, over a first group of electrically connectable pairings of adjacent jumper contacts 90. More particularly, the positive lead of the signal source 154a is connected to the first positive source terminal 52a, and the negative lead of the signal source 154b is connected to the second negative source terminal 54b. The first load 150 includes a positive lead end 150a electrically connected to the first positive load terminal 110a, and a negative lead end 150b electrically connected to the first negative load terminal 110b. Additionally, the second load 152 includes a positive lead end 152a electrically connected to the second positive load terminal 112a, and a negative lead end 152b electrically connected to the second negative load terminal 112b. According to a preferred embodiment, the first load 150 and the second load 152 are voice coils in the loudspeaker 12.
In accordance with the description of one preferred embodiment of the present invention as set forth above, under normal operating conditions the first fuse 70 shorts the first source end fuse contact 66a to the first load end fuse contact 66b, and the second fuse 72 shorts the second source end fuse contact 68a to the second load end fuse contact 68b. Therefore, the first circuit region 141 is electrically connected to the third circuit region 143, and the seventh circuit region 147 is electrically connected to the sixth circuit region 147.
In order to connect the first and second loads 150, 152 in series, the jumper 96 is attached to the terminal assembly 10 in a first orientation as shown in FIG. 5. The jumper 96 includes an indicator 97, and the main housing 30 includes a “series” label 156 and a “parallel” label 158. The first orientation is such that the indicator 97 appears generally aligned with the “series” label 156. As indicated above, the first and second conductive prongs 100, 102 are asymmetrically attached to the center 104 of the jumper 96. In the first orientation, the first conductive prong 100 shorts the first jumper contact 91 to the second jumper contact 92, thereby electrically connecting the second circuit region 142 to the third circuit region 143. As will be appreciated, however, the third circuit region is not connected to any other components so the first conductive prong is not utilized except as a placeholder. The second conductive prong 102 shorts the third jumper contact 93 to the fourth jumper contact 94, thereby electrically connecting the fourth circuit region 144 to the fifth circuit region 145. The first group of adjacent pairs of jumper contacts mentioned above is understood to be generally comprised of the pair of the first and second jumper contacts 91, 92 and the pair of the third and fourth jumper contacts 93, 94.
With reference to FIGS. 8, 9, and 10, the first positive load terminal 110a is electrically coupled to the second positive load terminal 112a, and the first negative load terminal 110b is electrically coupled to the second negative load terminal 112b. Therefore, with the appropriate connections from the respective one of the first and second load terminals 110, 112 being made, the first load 150 is connected in parallel with the second load 152 with respect to the audio signal source 154. The foregoing connections are made over a second group of electrically connectable pairings of adjacent jumper contacts 90. In this regard, the jumper 96 is attached to the terminal assembly 10 in a second orientation. In the second orientation, the indicator 97 appears generally aligned with the “parallel” label 158. The first conductive prong 100 shorts the fourth jumper contact 94 to the fifth jumper contact 95, and the second conductive prong 102 shorts the second jumper contact 92 to the third jumper contact 93. Accordingly, the third circuit region 143 is connected to the fifth circuit region 145, and the fourth circuit region 144 is connected to the sixth circuit region 146. The second group of electrically connectible pairings is understood to include the pair of the second and third jumper contacts 92, 93, and the pair of the fourth and fifth jumper contacts 94, 95. It is understood that the connection of the first and second loads 150, 152, the audio signal source 154, and the first and second fuses 70, 72 are identical in all respects to the aforementioned description accompanying FIGS. 5, 6, and 7.
To prevent the jumper 96 from inadvertently sliding from one of the, it is contemplated that the width of the jumper access slot 86 is substantially equivalent to the non-conductive body 98, and that at least a portion of the non-conductive body 98 is inserted through the jumper access slot 86. Accordingly, lateral movement of the jumper 96 is prevented since the proximal end 106 and the distal end 108 abut the jumper access slot 86. The portion of the non-conductive body 98 protruding from the jumper access slot 86 provides a gripping area for the user to remove the jumper 96.
Turning to FIGS. 11, 12, and 13, the terminal 10 is shown without the jumper 96 attached to the jumper contacts 90, and each of the first, second, third, fourth, and fifth jumper contacts 91-95 are exposed through the jumper access slot 86. In one preferred embodiment, the jumper access slot 86 may be covered to prevent debris from entering the interior of the main housing 30. In this particular arrangement, there are two audio signal sources 160, 162 with each having a positive lead and a negative lead. The first audio signal source 160 has a positive lead 160a electrically connected to the first positive source terminal 52a, and a negative lead 160b electrically connected to the first negative source terminal 52b. Further, the second audio signal source 162 has a positive lead 162a electrically connected to the second positive source terminal 52a, and a negative lead 162b electrically connected to the second negative source terminal 52b. In this configuration, the first audio signal source 160 and the second audio signal source 162 synchronously transmit the same audio signal, but its amplification is produced by separate amplifier units. Without interconnections between the jumper contacts 90, the signal from the first source 160 travels directly to the first load 150, and the signal from the second source 162 travels directly to the second load 152. In this configuration, the first and second audio signal sources 160, 162 are left and right sources in a stereo amplifier.
As will be appreciated from the detailed description of one preferred embodiment, the terminal assembly 10 in accordance with such embodiment improves the capability of switching between a parallel connection and a series connection between the plurality of loads 150, 152. Specifically, the jumper 96 may be attached to a first grouping of adjacent pairs of jumper contacts for a series connection, and the jumper 96 may be attached to a second grouping of adjacent pairs of jumper contacts for a parallel connection. Where it is desirable to connect to two separate audio signal sources 160, 162, to each of the loads 150, 152, the jumper 96 may be removed.
The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.
Patent Application
20080090470
