Patent Document

CROSS REFERENCE TO RELATED APPLICATION  
       [0001]     This application is a continuation of U.S. application Ser. No. 09/747,608, filed Dec. 22, 2000, to be issued. 
     
    
       [0002]     This invention generally relates to electrical component connectors and contacts. More particularly, the present invention relates to an inventive three point contact design that may be used to connect varied electrical components to circuit boards such that the components may be assembled or installed on the circuit board and removed from the board without the need for time consuming soldering and desoldering of the component leads. The inventive contacts use flexible integral spring elements and appropriate contact element shaping to ensure a solid electrical connection between the printed circuit board and the electrical component leads. With the use of the inventive spring contacts, components may be easily installed on a board and tested, and, if necessary, may later be removed or replaced without the need for time consuming soldering and desoldering of the component. The inventive contacts are designed to ensure sound electrical connection with component leads of different cross sections, shapes and sizes.  
       BACKGROUND DESCRIPTION  
       [0003]     As the size of electrical components used in electronic circuitry continues to decrease in size, the density of circuitry placed on printed circuit boards increases. With these two trends, a decrease in overall size and an increase in circuitry density, the value of space or real estate on circuit boards has similarly significantly increased. In addition to the importance and value of space on the board, equally important is need to ensure sound electrical connections between the component leads, which are decreasing in size and structure, and the circuit board.  
         [0004]     Another trend in the design and manufacture of circuit boards that kept pace with the complexity and number of circuits and components included on boards, is the need to test, and potentially replace, the fabricated circuits and installed components as they are fabricated or installed on the board and tested. The need to disassemble or replace components on circuit boards has become an important issue. For example, it is inefficient and costly to install a component on a board, to only find out, after the board assembly is complete, that the component is not functionally performing. The time and effort to disassemble, remove and replace the component is expensive and fraught with the potential for creating or causing additional problems in the circuit.  
         [0005]     One aspect of this problem is exemplified with electrical components that are installed on a board by soldering of the component leads to the board contacts. The time and effort to install a component, solder the leads to the contacts, test the component and, if the component is not functionally operable, desolder the leads and replace the component is very inefficient and expensive. As noted, in each of the desoldering, disassembly, reassembly and resoldering steps, there is the potential for creating additional problems in the board fabrication.  
         [0006]     The current designs for installing electrical components to a board are similar to integrated circuit sockets, where the electrical component leads are bent  90  degrees so that the lead may be inserted into the socket and soldered in place. Again, the soldering of the leads to ensure a sound electrical connection does not allow for quick or easy disassembly and removal of the component.  
         [0007]     Accordingly, there remains a need for a device or contact that allows an electrical component to be easily installed onto a circuit board without the need for solder connections, that ensures sound electrical connections and paths between the component leads and the circuit board, that allows the component to be tested through the board electrical connections, and also allows the component to, if necessary, be easily removed from the board and replaced with the need for desoldering the component leads.  
         [0008]     Such a device and contact would greatly increase the efficient assembly and fabrication of circuit boards necessary for mass production of electrical component packages used in various electronic devices.  
       SUMMARY OF THE INVENTION  
       [0009]     In view of the shortcomings of the prior art, it is an object of the present invention to provide an electrical contact that allows an electrical component to be easily and quickly installed on a circuit board and has sound electrical connections between the component and the board without the need for soldering of the component leads to the board contacts. It is a further object of the present invention that the electrical contact allows an electrical component to be easily and quickly removed from a circuit board without the need for desoldering of the component leads or without damaging the board contacts.  
         [0010]     To achieve this and other objects, and in view of its purposes, the present invention provides an electrical spring contact for use with varied electrical components, the spring contact comprising a body section, where the body section is attachable at one end to a circuit board; two arms attached to opposite sides of the body section, the two arms defining a separation between the arms; the two arms each having an elbow section extending each arm towards the opposite arm; and a center section attached to the body section between the two arms whereby an electrical component lead can be held by and between, and be in electrical contact with the center section and the two arms.  
         [0011]     It is a further object of the present invention to provide an electrical spring contact for use with varied electrical components, the spring contact comprising a body section having a first and second end and two opposing sides, the body section being attachable at the first end to a circuit board; two arms attached to the opposing sides of the body section and extending away from the second end of the body section, the two arms defining a separation between the arms, the arms each having an elbow section such that the separation between the two arms is reduced downstream of the elbow sections; and a center section attached to the body section between the two arms whereby an electrical component lead can be held by and between, and be in electrical contact with the center section and the two arms.  
         [0012]     It is a further object of the present invention to provide an electrical spring contact for use with varied electrical components, where the electrical spring contact can hold an electrical component lead having a diameter approximately in the range of 0.010 inches to 0.025 inches.  
         [0013]     Another aspect of the present invention is an electrical component assembly, having at least one electrical component, the electrical component having at least one electrical lead, and the connector assembly comprising a housing into which the electrical component fits and is held; and at least one electrical spring contact held within the housing, said electrical spring contact comprising, a body section, the body section being attachable at one end to a circuit board; two arms attached to opposite sides of the body section, the two arms defining a separation therebetween, the arms each having an elbow section extending each arm towards the opposite arm; and a center section attached to the body section between the two arms whereby the at least one electrical component lead can be held by and between, and be in electrical contact with the center section and the two arms.  
         [0014]     It is a further object of the present invention to provide an electrical contact assembly, having at least one electrical component, the electrical component having at least one electrical lead, the contact assembly comprising a first housing into which the electrical component fits and is held; a second housing; at least one electrical spring contact seated within the second housing, the electrical spring contact comprising, a body section, the body section being attachable at one end to a circuit board; two arms attached to opposite sides of the body section, the two arms defining a separation therebetween, the arms each having an elbow section extending each arm towards the opposite arm; and a center section attached to the body section between the two arms whereby the at least one electrical component lead can be held by and between, and be in electrical contact with the center section and the two arms.  
         [0015]     These and other aspects of the present invention are set forth below with reference to the drawings and the detailed description of certain preferred embodiments. It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are not intended to be or should be considered restrictive of the invention. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]     The invention is best understood from the following detailed description when read in connection with the accompanying drawings. It is emphasized that, according to common practice, the various features of the drawing are not to scale. On the contrary, the dimensions of the various features are arbitrarily expanded or reduced for clarity. Included in the drawings are the following Figures:  
         [0017]      FIG. 1  is a perspective view of an exemplary embodiment of the present inventive three point spring contact;  
         [0018]      FIG. 2 ( a ) is a top view of an exemplary embodiment of the present inventive three point spring contact;  
         [0019]      FIG. 2 ( b ) is a side cutaway view of section A-A from  FIG. 2 ( a ) for an exemplary embodiment of the present inventive three point spring contact;  
         [0020]      FIG. 2 ( c ) is a side view of an exemplary embodiment of the present inventive three point spring contact;  
         [0021]      FIG. 2 ( d ) is a partial top view of an exemplary embodiment of the present inventive three point spring contact with a component lead held in place in the spring contact;  
         [0022]      FIG. 3 ( a ) is a perspective view of an exemplary embodiment of a plurality of the present inventive three point spring contacts seated within an exemplary embodiment of an electrical contact assembly housing;  
         [0023]      FIG. 3 ( b ) is a perspective view of an exemplary embodiment of a cover for the  FIG. 3 ( a ) electrical contact assembly housing;  
         [0024]      FIG. 4  is a perspective view of the  FIG. 3 ( a ) electrical contact assembly housing and  FIG. 3 ( b ) cover completely mated;  
         [0025]      FIG. 5 ( a ) is a side view of an exemplary embodiment of a plurality of the present inventive three point spring contacts seated within an exemplary embodiment of an electrical contact assembly housing;  
         [0026]      FIG. 5 ( b ) is a side view of an exemplary embodiment of the  FIG. 5 ( a ) electrical contact assembly housing and a completely mated cover;  
         [0027]      FIG. 5 ( c ) is a top view of an exemplary embodiment of the  FIG. 5 ( a ) electrical contact assembly housing and a completely mated cover;  
         [0028]      FIG. 6  is a partial side cutaway view of section C-C from  FIG. 5 ( c ) for an exemplary embodiment of the  FIG. 5 ( a ) electrical contact assembly housing and completely mated cover;  
         [0029]      FIG. 7  is an end cutaway view of section B-B from  FIG. 5 ( a ) for an exemplary embodiment of the  FIG. 5 ( a ) electrical contact assembly housing;  
         [0030]      FIG. 8 ( a ) is a perspective, exploded view of exemplary embodiments of the present inventive electrical contact assembly housing, with a plurality of three point spring contacts, and covers, with an example laser pump;  
         [0031]      FIG. 8 ( b ) is a perspective view of an assembled exemplary embodiments of the present inventive electrical contact assembly housing, with a plurality of three point spring contacts, and covers, with an example laser pump;  
         [0032]      FIG. 9  is a perspective view of another exemplary embodiment of a plurality of the present inventive three point spring contacts seated within another exemplary embodiment of an electrical contact assembly housing;  
         [0033]      FIG. 10  is a partial perspective view of an exemplary embodiment of an electrical contact assembly housing with ridges formed in the assembly housing;  
         [0034]      FIG. 11  is a perspective view of an assembled exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts and in which an example laser diode is seated;  
         [0035]      FIG. 12  is a top view of an assembled exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts and in which an example laser diode is seated;  
         [0036]      FIG. 13 ( a ) is a side cutaway view of section A-A from  FIG. 12  for an exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts and in which an example laser diode is seated;  
         [0037]      FIG. 13 ( b ) is a side cutaway view of an exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts, in which an example laser diode is seated and showing a cover section over the spring contacts and laser diode leads;  
         [0038]      FIG. 14  is a perspective view of an exemplary embodiment of the cover section shown in  FIG. 13 ( b ) covering the spring contacts and laser diode leads;  
         [0039]      FIG. 15  is a perspective view of an exemplary embodiment of a retaining cover to hold an electrical component within a component housing;  
         [0040]      FIG. 16  is a perspective view of an exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts, in which an example laser diode is seated and showing the retaining cover of  FIG. 15  in place over the laser diode;  
         [0041]      FIG. 17 ( a ) is a top perspective view of another exemplary embodiment of a retaining cover to hold an electrical component within a component housing;  
         [0042]      FIG. 17 ( b ) is a bottom perspective view of an exemplary embodiment of the retaining cover shown in  FIG. 17 ( a ) to hold an electrical component within a component housing;  
         [0043]      FIG. 18  is a perspective view of an exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts, in which an example laser diode is seated and showing the retaining cover of FIGS.  17 ( a ) and  17 ( b ) in place over the laser diode; and  
         [0044]      FIG. 19  is a perspective view of an exemplary embodiment of the present inventive electrical contact assembly housing with a plurality of the present inventive three point spring contacts, in which an example laser diode is seated and showing a retaining cover with retaining clips in place over the laser diode.  
     
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS  
       [0045]     The present invention is directed to an electrical contact used to ensure sound electrical connections between an electrical component and a circuit board to which the electrical component is to be assembled. The present invention also is directed to an electrical contact assembly that is to be mounted to a circuit board, where the noted contact is used to make the electrical connection between the electrical component and the circuit board. Example electrical components that the electrical contact may be used with, and which are disclosed in detail herein, include, without limitation, laser pump and laser diodes packages.  
         [0046]     The inventive electrical contact has three primary structural elements. The contact elements include a body section, two flexible arms and a center section. The shape and structure of the contact elements is designed such that each contact holds and forms a strong electrical connection with one lead of an electrical component to be assembled on the circuit board. As designed, the arms and center section of the electrical contact provide three separate current paths between the component lead and the circuit board.  
         [0047]     A preferred embodiment of the inventive electrical contact  10 , as shown in the  FIG. 1  perspective view, and the FIGS.  2 ( a ) through  2 ( c ) top and side views, has a body section  12 , two arms  14  integrally formed along each side of the body section  12 , and a center section  16  integrally formed at one end of the body section  12 . The center section  15  is formed at one end of the body section  12  and extends into the area between the two arms  14 . The arms  14  are formed to extend along a portion of each side of the body section  12  and to extend beyond the end of the body section  12 . The end of the body section  12  that is opposite from the arms  14  is typically connected to a circuit board (not shown).  
         [0048]     The arms  14  each have an elbow section  18  such that downstream of the elbow sections  18 , the arms  14  extend towards each other as shown in  FIG. 2 ( a ). For the embodiment shown in FIGS.  2 ( a ) through  2 ( c ), the elbow sections  18  are located on the arms  14  approximately adjacent to the end of the center section  16  such that, in combination, the volume defined by the elbows  18  and the end of center section  16  form a lead cavity  25  into which the electrical component lead  31  is to be placed.  FIG. 2 ( d ) shows a partial top view of a preferred embodiment of the electrical contact  10 , with an electrical component lead  31  in place in the lead cavity  25 .  
         [0049]     The structural shape of the center section  16 , as shown in  FIGS. 1 and 2 ( a ), is such that it extends between the arms  14 . As shown in more detail in  FIG. 2 (b), the center section  16 , in a preferred embodiment, may curve away from the plane of the body section  12  to form a cantilever section between the arms  14 .  
         [0050]     As shown in  FIG. 2 ( d ), a component lead  31  is held in the lead cavity  25  within the electrical contact  10  by three points of contact. The center section  16 , and the two arms  14  each have a point of contact with the component lead  31 . Each of the three points of contact also establishes a separate current path between the component lead  31  and the contact  10 . Accordingly, in the shown preferred embodiment of the inventive electrical contact three separate and distinct current paths exist between the electrical component and the printed circuit board to which the component is to be attached. Moreover, as shown in  FIG. 2 ( d ), the three separate current paths are distributed across the cross-section of the component lead  31 . For example, for the  FIG. 2 ( d ) preferred embodiment, the three points of contact are approximately equi-distant about the circumference of the component lead  31 . The distribution of current paths across the component lead cross-section provides an additional level of robustness in the electrical connection between the contact  10  and the component lead  31 .  
         [0051]     An additional feature of the present inventive electrical contact is the lead cavity  25  (formed by the arms  14  and the center section  16  and having an approximate triangular shape (see  FIG. 2 ( a )), accommodates component leads of varied cross sections. While the  FIG. 2 ( d ) embodiment shows a circular cross section for the component lead  31 , a square, rectangular, oval or other lead cross section would easily fit in the lead cavity  25  between the arms  14  and the center section  16 . No matter what component lead cross section is provided, the inventive electrical contact has three points of contact with the component lead.  
         [0052]     An objective of all electrical contacts is to establish and maintain a sound electrical connection between the contact and the lead to which it is attached. The force exerted by the contact on the lead is one aspect of the electrical connection. It has been discovered for the preferred embodiment shown in  FIGS. 1 through 2 ( d ) that a normal force of approximately  50  grams applied by each of the arms  14  and the center section  16  to the component lead  31  is generally sufficient to establish a sound electrical connection. The normal force is the force imparted to the component lead perpendicular to the surface of the component lead. Although  50  grams of normal force is sufficient for good electrical connections, in other equally effective preferred embodiments, the normal force applied by the three sections of the contact  10  to the component lead  31  may be approximately in the range of 60 to 120 grams.  
         [0053]     The selection of the forces applied to the component lead  31  by the contact  10 , or more particularly, applied by the arms  14  and center section  16 , may be made through design and selection of the flexibility or elastic characteristics for the center section  16  and the arms  14 . In a preferred embodiment of the inventive three point contact, the elbow sections  18  may be fabricated to have a particular spring constant or force per distance elastic characteristic. That is, for a higher spring constant, a larger force will be imparted to the component lead  31  by the arm  14 . Similar to making the arms  14  with particular flexible force characteristics, the center section  16  similarly could be made in whole or in part to have a design spring constant.  
         [0054]     Spring constants approximately in the range of 20 to 150 grams per thousandths of an inch (grams/mil) have shown good force characteristics and provided sound electrical connections. While too low a spring constant may result in an insufficient force being applied by the contact arms  14  or the center section  16  to the component lead  31 , the force characteristics should not be chosen to be excessive. If a very high spring rate is chosen such that very large forces are required to move the arms  14  to allow the component lead  31  into the lead cavity  25 , the potential exists that the component lead may deform or material may be scraped away from the lead. For the typical electronics application, the component leads have a very small diameter, being approximately in the range of 0.010 to 0.025 inches. Moreover, the component leads, in certain applications are manufactured with a gold covering or plating. Accordingly, if the force characteristics of the contact are designed to be too high, the very small component leads may be deformed or damaged, which could adversely affect functional performance of the component and circuit.  
         [0055]     One preferred embodiment of the inventive spring contact that has shown good force characteristics and strong electrical connections uses a higher spring constant for the center section  16  than for the arms  14 . However, other equally effective embodiments use similar spring constant characteristics for both the center section  16  and the arms  14 .  
         [0056]     In addition to altering the spring constant or spring coefficient of the center section  16  or the arms  14  to select the appropriate force characteristics of the spring contact  10 , the direction of the force imparted by the arms  14  to component lead  31  as shown in  FIG. 2 ( d ) may also be altered by changing the angle at which the elbows  18  direct the arms  14  toward each other. As the angle of the elbow  18  increases, the force imparted by the arms  14  urging the component lead  31  towards the center section  16  also increases. By way of example, if the elbows  18  only very slightly directed the arms  14  towards each other, then the direction of the force imparted by the arms to the lead would approximately be towards the opposite arm. On the other hand, if the elbows  18  sharply directed the arms  14  towards each other, then the direction of the force imparted by the arms  14  would primarily be towards the center section  16 . That is, the steeper the angle that the arms  14  are directed towards each other downstream of the elbow  18 , the larger the force that urges the component lead  31  towards the center section  16 .  
         [0057]     In the preferred embodiment shown in  FIGS. 1 , and  2 ( a ) through  2 ( c ), the arms  14  have a second elbow section  20  further downstream from the first elbow sections  18  such that the arms  14  extend away from each other after the second elbow sections  20 . As shown in this configuration, the contact  10  approximately resembles the shape of a traditional clothespin. With the arms  14  separated at their end, the placement of the electrical component lead  31  into the lead cavity  25 , as shown in  FIG. 2 ( d ), is facilitated.  
         [0058]     While different materials may be used from which to fabricate the spring constant, in one preferred embodiment, the contact  10  may be manufactured of a phosphor bronze material.  
         [0059]     The present inventive three point spring contact may be used to connect many different electrical components, having at least one lead, to circuit boards. Simply by way of illustration, and not to be limiting, two particular embodiments of inventive electrical contact assemblies using the three point spring contact are disclosed below.  
         [heading-0060]     Laser Pump Contact Assembly Embodiment  
         [0061]     One example of a component that may be interconnected to a circuit board by the spring contact of the present invention is an electrical laser pump . The laser pump has a plurality of cantilever component leads extending from either side of the laser pump in a butterfly like configuration. For this embodiment of the present inventive electrical contact assembly, the three point spring contacts are seated within a housing, and the laser pump component is similarly seated into a separate housing sized and shaped to accommodate the laser pump. FIGS.  8 ( a ) and  8 ( b ) respectively show perspective views of an embodiment of a laser pump assembly, in an exploded-unassembled condition, and an assembled configuration.  
         [0062]     An embodiment of the housing  42  into which the spring contact is seated is shown in a perspective view in  FIG. 3 ( a ). For the example laser pump  30  shown in FIGS.  8 ( a ) and  8 ( b ), there are seven component leads extending from each side of the laser pump  30 . Accordingly, the contact housing  42  has seven slots for the spring contacts  10 , there being one contact  10  for each component lead  31 . As shown in FIGS.  3 ( a ) and  5 ( a ), the body section  12  of the contact  10  extends through the housing  42  for attachment to the circuit board to which the laser pump  30  is to be assembled. When completely seated in the contact housing  42 , the top of the contacts  10  protrude above the housing  42 , as shown in  FIG. 5 ( a ) so that the component leads  31  may be pressed into their respective position between the contact arms  14  and into the lead cavity  25 . Once pressed into place, each component lead  31  is held by the forces of the spring contact  10  imparted by the arms  14  and the center section  16 , as described above.  
         [0063]     Because in this laser pump embodiment, the component leads  31  and the top portion of the spring contact  10  are exposed, a housing cover  33  may be used to protect the leads  31  and the contacts  10 . A preferred embodiment of a housing cover  33  which may be used with the disclosed laser pump package is shown in  FIG. 3 ( b ). The housing cover  33  not only shields a portion of the component leads  31  and the tops of the contact  10  when in place over the housing  42 , but may also be designed to ensure that the leads  31  stay in place in the contact  10 , and more particularly in the lead cavity  25 . The embodiment of the cover  33  shown in  FIG. 3 ( b ) provides an example design with a plurality of nodes  35  shaped and positioned to fit into the contact openings in the housing  42 . As more particularly shown in  FIG. 4 , once the component lead  31  is seated in the contact  10 , the cover  33  may be placed over the housing  42  and the cover nodes  35  fit over and engage the component leads  31 .  
         [0064]     To further ensure the laser pump leads  31  are protected and maintained in the preferred position in the contacts  10 , the cover  33  may also have flexible clips  34  which engage with step catches  43  provided on the sides of the housing  42 . FIGS.  5 ( a ) and  6  show a side view and a cut away partial side view of the housing  42  and the catches  43 .  FIG. 5 ( b ) and  FIG. 6  also show the housing  42  with the cover  33  in place over the housing  42 . The nodes  35  fit respectively into each contact location. The cover  33  may be removed from the housing  42  by simply squeezing the flexible clips  34  to release them from each catch  43 .  FIG. 5 ( c ) shows a top view of the cover  33  and shows the C-C view presented in the cutaway side view of the housing  42  and the cover  33  shown in  FIG. 6 . A more detailed internal view of a contact  10  seated within housing  42  in shown in  FIG. 7  (view B-B noted in  FIG. 5 ( a )). The  FIG. 7  cutaway view shows the elements of the contact  10 , including center section  16  and one of the two arms  14 .  
         [0065]     As shown in more detail in FIGS.  8 ( a ) and  8 ( b ), the laser pump may be easily installed to a circuit board by pressing the laser pump into place in its housing  40 , such that the component leads respectively engage the contacts  10  seated in the housing  42 . Once in place, the cover  33  may be pressed into place over the housing  42  to protect the laser pump leads  31  and the contacts  10 . If the laser pump needs to be removed or replaced, the cover  33  may be removed by squeezing the clips  34  towards each other to disengage each clip  34  from the catches  43 . The laser pump  30  may then be lifted out of its housing  40  and the laser pump leads  31  are pulled away from the contacts  10 .  
         [heading-0066]     Laser Diode Contact Assembly Embodiment  
         [0067]     Another example of the present inventive electrical contact assembly using the inventive spring contact is for a laser diode. Similar to the above described laser pump assembly, the laser diode has multiple component leads  31  and, to ensure solid attachment to a circuit board, a housing sized and shaped to hold the laser diode.  
         [0068]     As shown in  FIG. 9 , an embodiment of a housing  40  sized and shaped for a laser diode  28  having three electrical leads, has three locations where the contacts  10  are seated. Because the housing  40  is to be attached to a circuit board, as shown in  FIG. 9 , the contact body sections  12  extend through the housing  40 , and are to be attached to the circuit board.  FIGS. 11 through 13 ( a ) show a preferred embodiment of a laser diode assembly with a laser diode  28  installed into the housing  40 . As shown, the laser diode leads  31  are seated in position in the contacts  10 , and more particularly in the lead cavity  25 . The cutaway side view of the laser diode embodiment shown in  FIG. 13 ( a ), being the A-A view noted in  FIG. 12 , shows the seated position of the contacts  10  with each center section  16  engaged against respective laser diode leads  31 . As shown in  FIG. 13 ( a ), unlike the laser pump assembly, certain components may require different size contacts to accommodate different locations of component leads. More particularly, for the  FIGS. 12 and 13 ( a ) embodiment, the contact  10  connected with the middle lead, being the contact  10  on the right hand side of  FIG. 13 ( a ), has a longer body section  12  than the other two contacts because the location of the two outside components leads are closing to the bottom of the laser diode  28 .  
         [0069]     While the disclosed embodiment of a laser diode assembly shown in  FIGS. 9 through 13 ( a ) does not use a cover, as shown in the above laser pump assembly, there is still a need to ensure the laser pump  28  is held in place within the housing  40 . For the preferred embodiment of laser diode housing  40  shown in  FIG. 9 , ridges  44  maybe formed on the housing  40 , as shown in  FIG. 10 , such that once the laser diode  28  is pressed into place in the housing  40 , a set of ridges  44  apply a retaining force to the laser diode body to hold the laser diode  28  in the housing  40 .  
         [0070]     In another preferred embodiment of the laser diode assembly, as shown in  FIG. 13 ( b ) and  FIG. 14 , a cover  33  may be used to provide protection for the leads  31  and the contacts  10 . For the shape of the preferred embodiment of the cover shown in FIGS.  13 ( b ) and  14 , the cover  33  also holds the laser diode  28  in place, as shown in the side cutaway view of  FIG. 13 ( b ). In order to hold the cover  33  in place over the laser diode  28  and laser diode leads  31 , the cover may be formed with flexible clips  34  located on both sides of the cover, as shown in  FIG. 14 , that latch into the housing  40 .  FIG. 13 ( b ) also shows how the laser diode assembly sits on the printed circuit board  50  and that the body section  12  of the spring contacts  10  extends through the board  50 . As shown, the laser diode  28  and its component leads  31  are securely held in the housing  40  and spring contacts  10 , and is protected from inadvertently being dislodged from the spring contacts  10  due to vibration or physical shock.  
         [0071]     As an alternative preferred embodiment for the laser diode housing  40  shown in  FIG. 10 , a retaining cover  36  could be used to hold the laser diode  28  in place in the housing  40 .  FIG. 15  shows an exemplary embodiment of a retaining cover  36  that is sized and shaped to fit over the laser diode  28  and provide a retaining force to the laser diode an hold it within the housing  40 . The  FIG. 15  embodiment of a retaining cover  36  is shown in place over a laser diode in  FIG. 16 . The embodiment of the retaining cover shown in  FIGS. 15 and 16  has flexible clips  37  that engage into either side of the housing  40 , similar to the above described clips  34 , which allow the cover  36  to be clipped into place and then easily removed by pulling the clips  34  away from the housing  40 . Although it is not shown in  FIG. 16 , both retaining covers  33  and  36  (as shown in  FIGS. 14 and 15 ) could be used to cover and protect the component leads  31  as well as to hold the laser diode in place within the housing  40 .  
         [0072]     In yet another preferred embodiment, the electrical component may be completely covered and held in place by a cover section. Such a retaining cover  38  for a laser diode is shown in top and bottom perspective views in FIGS.  17 ( a ) and  17 ( b ). This preferred embodiment of a retaining cover extends the length of the laser diode and covers the component leads and spring contacts. As shown in  FIG. 18 , the cover  38  may be sized and shaped to fit over the electrical component, in this embodiment a laser diode  28 , and precisely engage the component housing  40 .  
         [0073]     In one preferred embodiment, the cover  38  and housing  40  may have double sided adhesive (not shown) along the surfaces  39  where the cover  38  and housing  40  join. In another preferred embodiment, shown in  FIG. 19 , the cover  38  may have flexible clips  37 , similar to the above described flexible clips, that engage the sides of housing  40  and hold the laser diode  28  in place in the housing  40 .  
         [0074]     Similar to the above described laser pump assembly, the laser diode package shown in FIGS.  11 ,  13 ( a ),  13 ( b ),  16 ,  18  and  19  may be easily installed to a circuit board by pressing the laser diode into place in its housing  40 . As pressed into place, the three laser diode electrical leads  31  respectively engage the contacts  10  also seated in housing  40 . If at some time the laser diode needs to be removed or replaced, it may easily be lifted out of the housing  40  and the laser diode leads  31  accordingly pulled out of the contacts  10 . As described, with a cover in place, the laser diode, component leads and spring contacts have added protection and are secured from unintentionally being dislodged due to shock or vibration.  
         [0075]     Although the invention has been described with reference to exemplary embodiments, it is not limited thereto. For example, while disclosure of use of the inventive spring contact and contact assembly has been made for a laser pump package and laser diode package, the spring contact may also be used with other electrical components. Accordingly, it is intended to be and understood that the following claims should be construed to include other variants and embodiments of the invention which may be made by those skilled in the art as being within the true spirit and scope of the present invention.

Technology Category: 5