Abstract:
Disclosed is a stereo audio jack assembly that reduces or eliminates signal loss with an audio plug. The jack assembly employs a support housing having a passageway sized to receive the audio plug with an insulated first connector having first and second terminal strips, each formed integral to a first disk base and positioned to engage the grooved tip of an audio plug when engaged. A second isolated connector includes a terminal strip positioned to engage one side of an audio plug sleeve when engaged. And a third isolated connector includes a terminal strip positioned to engage another side of an audio plug sleeve when engaged to allow for a stereo connection by having distinct contacts.

Description:
RELATED APPLICATION 
     The instant Application is related to U.S. patent application Ser. No. 14/867,739, filed Sep. 28, 2015, entitled MULTI-CONTACT AUDIO JACK CONNECTOR ASSEMBLY, the contents of which are incorporated herein by reference. 
     FIELD OF THE INVENTION 
     This invention relates to the field of connectors used for audio signals; and in particular, to an improved stereo audio jack connector assembly having multiple contacts. 
     BACKGROUND OF THE INVENTION 
     Audio jacks, also referred to as phone connectors, phone jacks, or jack plugs, are typically used in connector assemblies for carrying audio signals. Dating back to the late 1800&#39;s, the audio jack is one of the oldest electrical standards still in existence. The audio jack is the preferred connector for use in the music industry based upon a 6.35 mm (4 inch) plug diameter, which provides a robust assembly that can be reused indefinitely. 
     The size of the audio jack makes it easy to grasp without tools, and it cannot be bent if stepped upon or otherwise used in a manner expected of insertion and removal. For this reason, the audio jack is the preferred connector for use with electric guitars, microphones, speakers, amplifiers, line levelers and like equipment found in the music industry, primarily audio signal transmission. The audio jack is cylindrical in shape having two, three or four contacts. 
     Unique to the audio jack is the amount of surface area that is provided by a cylindrical plug. However, the connector to which the plug engages is typically a single prong having a single point of contact. The single point of contact can become problematic, as it needs to press against the plug in order to create a connection. The greater force the contact imparts upon the plug, the better the electrical connection; however the higher stress placed upon the connector, can cause the ground connector to be off center and lose contact. If the electrical contact is de minimus, the ability to transfer an electrical signal is reduced. The conventional electrical contacts employed to engage the plug provide very little contact surface, which results in poor audio quality. 
     Numerous attempts have been made to improve upon the audio jack. U.S. Pat. No. 7,874,855 describes an audio jack connector having an insulating housing and a passageway. A contacting terminal is disposed on a side of the passageway having a holding portion and two contacting pieces slanted toward the same side separately from two opposite ends of the holding portion. A first fixing terminal, arranged on a side of the passageway, adjacent to the contacting terminal, has a first fixing slice. The first fixing slice has a side extended obliquely to form a first contacting piece connecting with one contacting piece. A second fixing terminal placed on an opposite side of the passageway has a second fixing slice, a second contacting piece obliquely connected with the second fixing slice for connecting with the other contacting piece. The contacting pieces are forced to slide on and depart from the first contacting piece and the second contacting piece when the contacting terminal is elastically pushed by the inserted plug. 
     U.S. Publication No. 2007/0232150 describes an audio jack connector including a housing and a set of contacts. The housing has a body, a mating portion extending from one end of the body, and an insertion hole defined in the mating portion and extending inwardly through the body along an axis direction. The set of contacts include signal contacts, a set of switching contacts disposed in the housing, and an exposed contact disposed at the outside of the housing. The switching contacts have a fixed contact and a movable contact. The mating portion of the housing has a cavity defined at an outer surface thereof for receiving a contacting portion of the exposed contact. The contacting portion has a propping block protruding outwardly beyond the outer surface of the mating portion. 
     U.S. Publication No. 2009/0298347 describes an audio jack connector that is suitable for selectively engaging with either a first multi-pole plug or a second multi-pole plug having more poles than the first multi-pole plug. Each of the multi-pole plugs has a plurality of poles insulated by insulating rings arranged thereinbetween. The audio jack connector includes an insulating housing having a chamber extending inward from a front thereof, and terminal groups. The terminal groups are disposed in the corresponding grooves and project into the chamber. When either of the first and the second multi-pole plugs is respectively inserted into the chamber, the terminal groups are against the multi-pole plug, wherein at least one of the terminal groups is against one of the insulating rings of the first multi-pole plug. 
     U.S. Pat. No. 6,220,899 discloses a connecting sleeve spring resiliently mounted in a connecting sleeve of an electrical connecting jack. The connecting sleeve spring has a arcuate sinusoid-like side profile, with its two ends curving in a direction opposite the curve of a center contact portion. The center portion has an inwardly angled tongue. When a plug having a collar is inserted into the electrical connecting jack, the collar comes in contact with the tongue and pushes the central contact portion inward, thus forcing the two ends of the connecting sleeve spring to move outward. The two ends press against the inner periphery of the collar. 
     U.S. Pat. No. 6,270,380 discloses a multipolar electrical connector that, as a counter connector 90, uses a single-head plug having a pole shaft in which center poles are disposed in plural positions in the axial direction, respectively (hereinafter, referred to merely as “multipolar connector”). In the invention, plural predetermined contact pieces are incorporated into the body, so that plural poles are ensured by the predetermined contact pieces. A required number of first additional contact pieces and second additional contact pieces are placed on the outer and inner peripheral sides of the boss portion, so that two or more poles are ensured by the additional contact pieces. According to the invention, therefore, the number of poles is increased by that of poles which are formed by the additional contact pieces. 
     U.S. Pat. No. 6,923,687 discloses an audio jack connector comprising a rectangular-shaped insulating housing, and a plurality of different contacts. The insulative housing has a base and a mating portion. A channel extends through the base and the mating portion. A front end of the channel defines a gap, and a number of receiving slits defined on the base at two sides of the channel, the base defining a depression communicating with the channel at a top wall thereof. A first and a second contact are received in the slits. A third contact mates with the top wall and comprises a mounting portion extending beyond the bottom wall of the insulative housing. A fourth contact is installed in a front end of the insulative housing and has an engaging portion extending through the gap and inserted into the front end of the channel for electrically connecting the mating plug connector. 
     U.S. Pat. No. 7,654,872 discloses an audio jack connector which includes a housing and a terminal group. The housing has an insertion hole extending inward from the front of the housing. The bottom of the base defines at least one signal terminal recess and an auxiliary terminal recess, a first aperture is defined in the bottom of the auxiliary terminal recess and communicates with the signal terminal recess. The terminal group has at least one signal terminal and an auxiliary terminal received in the signal terminal recess and the auxiliary terminal recess respectively. The signal terminal has a contact portion projecting into the insertion hole and an elastic portion extending from the end of the contact portion. 
     U.S. Pat. No. 7,785,119 discloses an audio jack connector having an insulating housing defining a rectangular base. The base has a passageway passing therethrough for receiving an inserted audio plug connector. A channel is formed at a top surface of the base for communicating with the passageway. A set of switch terminals mounted to the insulating housing comprise an elastic terminal and a fixing terminal. The elastic terminal has a first top plate and a switch arm extended outward from the first top plate, with a free end thereof projecting into the passageway through the channel. The fixing terminal has a second top plate disposed above the channel. The second top plate has a pair of cantilever switch slices extending toward each other and perpendicular to an extending direction of the switch arm, with free ends thereof suspended over the free end of the switch arm and spaced from each other. 
     U.S. Pat. No. 7,794,285 discloses an audio jack connector for receiving an audio plug connector which includes an insulating housing and a contact terminal. The insulating housing defines an insertion hole from a front end to a rear end thereof for receiving the audio plug connector and a recess communicating with the insertion hole. The contact terminal has a connecting portion received in the recess. Two opposite ends of the connecting portion are extended toward a same side to form a base portion and a first elastic arm. A first contact portion is protruded towards the base portion from a free end of the first elastic arm. A second elastic arm is bent towards the connecting portion from one end of the base portion. A second contact portion is protruded towards the first elastic arm from a free end of the second elastic arm. The first and second contact portions protrude into the insertion hole. 
     U.S. Pat. No. 8,801,476 discloses an electrical contact of an audio jack connector including a main portion, a soldering portion bending from a lateral edge of the main portion, an elastic portion extending curvedly from a distal end of the main portion to be located above the main portion. The elastic portion has a flexible beam, a first arm extending upwardly from the flexible beam and a second arm curvedly bending from the first arm. The first arm is consistent with a direction along which an audio plug connector is inserted. The second arm is adverse to a direction along which the audio plug connector is withdrawn. 
     U.S. Pat. No. 8,888,537 discloses an improved electronic audio receptacle connector which employs contacts that have multiple points of contact with a mating audio plug. The contacts each have multiple segments, each segment having a plurality of transverse fingers that interface with a conductive portion of the audio plug. The multiple points of contact improve the reliability of the receptacle connector. The housing of the receptacle connector may be made of two portions mated along an interface. The two portions may have features along the interface to impede moisture ingression and to interlock them together. U.S. Pat. No. D607,834 discloses an ornamental design for a contact of an audio plug connector. 
     SUMMARY OF THE INVENTION 
     Disclosed is a stereo audio jack assembly for receiving a conventional audio plug comprising a support housing having a passageway sized to receive the audio plug. The support housing has an insulated first connector having first and second terminal strips, each having a proximal end formed integral to a first disk base and extending obliquely and symmetrically to a distal end. The distal end of the terminal strips are positioned to engage the grooved tip of an inserted audio plug. A second isolated connector with first and second terminal strips, each having a proximal end extending obliquely and symmetrically from an outer edge of second disk base to a distal end, are positioned to engage the sleeve of the audio plug. The second connector is positionable on the mounting collar and electrically isolated from the first connector, wherein the second connector is fastened to the support housing securing said first connector therebetween. 
     An objective of the instant invention is to provide a stereo audio jack assembly that reduces or eliminates signal loss between the jack receptacle and a conventional audio plug. 
     Another objective of the invention is to provide a stereo audio jack assembly that employs connectors formed integral with a common base to provide a uniform clamp pressure on the sleeve and grooved tip of an audio plug. 
     Yet still another objective of the invention is to provide a stereo audio jack assembly that employs a metal bias with four terminals spaced 90 degrees apart to provide a consistent pressure gradient upon an engaged audio plug. 
     Still another objective of the invention is to provide a stereo audio jack assembly having scalloped terminals for engaging a larger surface area of an audio plug to assure a resistance free connection. 
     Yet still another objective of the invention is to provide a stereo audio jack assembly having terminals that are maintained in position by a notched insulator ring. 
     Still another objective of the invention is to provide a stereo audio jack assembly that is compact in size and easy to assemble. 
     Yet still another objective of the invention is to provide a stereo audio jack assembly design that can be scaled from ¼ inch, ⅛ inch, and micro sizes. 
     Other objectives and further advantages and benefits associated with this invention will be apparent to those skilled in the art from the description, examples and claims which follow. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the stereo audio jack assembly; 
         FIG. 2  is a front view thereof; 
         FIG. 3  is a side view thereof; 
         FIG. 4  is an exploded view thereof; 
         FIG. 5  is a perspective view of the first connector; 
         FIG. 6  is a perspective view of the second connector; 
         FIG. 7  is a perspective view of the third connector; and 
         FIG. 8  is a side view of the stereo audio jack assembly with a plug inserted. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Detailed embodiments of the instant invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific functional and structural details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representation basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. 
     Now referring to the drawings, set forth is a stereo audio jack assembly  10  for receiving a conventional audio plug. The preferred audio plug is a conventional 6.35 mm (¼ inch) plug that has been an industry standard for over a century. The audio plug includes a groove formed along a tip, which operates as a detent and is commonly used for securing the audio plug into a receiving jack assembly. 
     The instant invention is directed to an improved stereo audio jack assembly  10 , which consists of a support housing  20  having an entry collar  22  which is circular in shape and may include threads  24  for securement to a façade, not shown, commonly found on audio equipment. The threads  24  are used to engage a securement nut  25  placed on the access side of a support frame, not shown. A washer  27  can be used between the support housing  20  and the securement nut  25 . A support surface  26  having an upper surface  28  adjoins the entry collar  22 . The upper surface  28  may include a friction induced surface that aids in mounting of the assembly to prevent spinning of the support housing while being threaded. The support surface  26  has a diameter that is larger than the diameter of the entry collar  22  for an adjoining mounting collar  30 . In this manner, the support housing  20  having the upper surface  28  is used for engaging the remainder of the jack assembly, and the lower surface  32  is used for engaging the access side of the support frame. The support housing  20  has a passageway  34  extending through the mounting collar  30 , the support surface  26 , and the entry collar  22  to allow passage of the tip of an audio plug. 
     A first insulating ring  50  is positionable over the mounting collar  30 , having a central aperture  52  sized for placement over the mounting collar and an outer edge  54  of a diameter so as to engage surface  28 . The insulating rings used herein are preferably constructed from a non-conductive material such as plastic, fiber, rubber, cord, paper or the like. 
     The first insulating ring  50  supports the first connector  60  having a disk base  62  with a centrally disposed aperture  64 , formed integral with a first terminal strip  66  and a second terminal strip  68 . Each of the terminal strips  66 ,  68  extend obliquely and symmetrically from an outer edge of the first disk base  62 . The first terminal strip  66  has a proximal end  72  extending from first disk base  62  to a distal end  74 ; the second terminal strip  68  has a proximal end  76  extending to a distal end  78 , forming a mirror image of the first terminal strip  66 . The first and second terminal strips  66 ,  68  have a length from the distal end to the proximal end sized to engage the groove on an audio plug. As illustrated, the first and second terminal strips are biased inward to provide a uniform clamping against the groove of an audio plug. The distal ends  74  and  78  include scallop formations depicted as numerals  80  and  82  which are constructed and arranged to grasp a portion of the groove, creating a semi-circular attachment to the groove to provide multiple contact points with the surface of the groove. The first connector  60  includes a coupling tab  84 , of which an audio wire may be secured thereto. The tab  84  provides a resistant-free connection to the first and second terminal strips  66  and  68 , and positive engagement to an audio plug. 
     A second insulating ring  90  is made of a non-conductive material similar to the first insulating ring  50 . The second insulating ring has a centrally disposed aperture  92  and an outer edge  94  having terminal strip sections  96 ,  98  for receipt of the proximal ends  72  and  76  of terminal strips  66 ,  68 . The terminal strips  66 ,  68  maintain the second insulating ring  90  in a fixed position. The second insulating ring  90  encapsulating the base  62  to isolate the first connector  60 . 
     A second connector  100  is formed from a base  102  having a centrally disposed aperture  104 , which frictionally engages the upper portion of the mounting collar  20 . The second connector  100  can be snapped onto the support housing  20 . A terminal strip  106  has a proximal end  108  and a distal end  110  so as to engage a portion of the sleeve of the audio plug. Similar to the first connector, a scallop shape  112  conforms to the portion of the audio plug, providing multiple contact points that are arranged to impact a greater portion of the audio plug to eliminate resistance. The second connector  100  includes a second coupling tab  114  for securement to an electrical wire for carrying of an audio signal. 
     A third insulating ring  120  is made of a non-conductive material similar to the first and second insulating rings. The third insulating ring has a centrally disposed aperture  122  and an outer edge  124  having terminal strip sections  126  and  128  for receipt of the proximal ends of terminal strips  66  and  68 . Section  130  positions terminal strip  106  of the second connector, and section  132  positions terminal strip  142  of the third connector. The sections maintain the second and third connectors in a fixed position. 
     The third connector  140  is formed from a base  144  having a centrally disposed aperture  146  that frictionally engages the upper portion  26  of the mounting collar  30 . The third connector  140  can be snapped onto the support housing  20  or secured thereto with a coupling such as a snap ring. Tab  145  may also be used to engage a section of an insulating ring to prevent rotation of the connector. A terminal strip  142  has a proximal end  148  and a distal end  150  so as to engage a portion of the sleeve of the audio plug. Similar to the first and second connectors, a scallop shape  152  conforms to the portion of the audio plug, providing multiple contact points that are arranged to impact a greater portion of the audio plug to eliminate resistance. The third connector  140  includes a third coupling tab  154  for securement to an electrical wire for carrying of an audio signal. 
     For ease of clarification, a ¼ inch plug and audio jack assembly has been described as the primary embodiment. However, it is obvious to one skilled in the art, and to be understood, that the audio jack assembly illustrated can be scaled to received ⅛ inch plug or micro plug sizes using the same terminal configuration. The claims of this invention are not limited to the size of plug and are applicable to ¼ inch, ⅛ inch, or micro plugs. 
     A conventional stereo plug  91  has a shank  93  which operates as a ground, a first stereo input section  95  and a second stereo input section  97 . Isolation rings  99  and  101  provide spacing between the input sections and the ground. The addition of a grounding contact eliminates the unreliable pressure ground of a conventional jack plug that when pressure is provide by pushing the shank against the wall of the fack body. 
     All patents and publications mentioned in this specification are indicative of the levels of those skilled in the art to which the invention pertains. It is to be understood that while a certain form of the invention is illustrated, it is not to be limited to the specific form or arrangement herein described and shown. It will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention, and the invention is not to be considered limited to what is shown and described in the specification and any drawings/figures included herein. 
     One skilled in the art will readily appreciate that the present invention is well adapted to carry out the objectives and obtain the ends and advantages mentioned, as well as those inherent therein. The embodiments, methods, procedures and techniques described herein are presently representative of the preferred embodiments, are intended to be exemplary, and are not intended as limitations on the scope. Changes therein and other uses will occur to those skilled in the art, which are encompassed within the spirit of the invention and are defined by the scope of the appended claims. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention, which are obvious to those skilled in the art, are intended to be within the scope of the following claims. The term “coupled” is defined as connected, although not necessarily directly, and not necessarily mechanically.