Abstract:
The present invention provides a high definition multimedia interface (HDMI) connector comprising an insulated housing assembly, a metallic housing assembly, a plastic outer shell and a front cover, wherein the insulated housing assembly consists of an insertion portion and a wiring block, and said metallic housing assembly consists of a metallic front shell and a metallic rear shell.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a high definition multimedia interface (HDMI) connector, and more specifically to a small connector utilized in digital TV, DVD player, deck-top box (video signal converter), and other digital Audio/Video (AV) product. 
   2. Description of the Related Art 
   LCD in nowadays has become a most popular output device for Audio/Video (AV) product. Since it plays an important role in the production of modern PC monitor and TV display, and in the light of connector for digital signal transmission has become a mainstream product in LCD industries, the HDMI connector of the invention is thus created to serve this purpose. The HDMI (High Definition Multimedia Interface) is a transmission interface utilized for the transmission of a high definition multimedia digital signal including high fidelity image and multi-channel audio signal. The earliest specification of the HDMI was established by several Audio/Video industries, such as HITACHI, Panasonic, Philips, Sony, Silicon Image, Thomson and Toshiba. It established the most frequently used standard specification based on DVI (Digital Visual Interface) for digital image signal transmission. The object of the invention is to transmit a digital screen signal between PC and LCD and display a live scene on LCD with high fidelity. 
   Furthermore, the digital image signal transmitted by DVI also provides the effect of unauthorized copy proof, and its signal may be encoded at the transmitting end and decoded at receiving end that will provide the effect of preventing unauthorized reproduction of the image signal being transmitted. Although DVI improved the resolution and quality of picture on a LCD screen, however, DVI is not absolutely perfect, because it didn&#39;t take the transmission of digital audio signal into account so far, therefore users need to connect additional line or use traditional AV terminal for signal transmission. This may not raise the question of compatibility among the signal transmission in the application of personal computer, but it does cause chaos when used in the family theater set which is getting more and more popular among the consumers. 
   Furthermore, as the digital products such as digital video camera and digital electronic camera are prevailed, it may become bothersome that if LCD TV requires a plurality connection lines. This may also increase the number of installation components for family theater sets, and further increase the price of product. Therefore, the HDMI of the present invention is thus created for family theater set to eliminate the flaws of DVI mentioned above. The HDMI of the present invention is not only in compliance with the standard specification of DVI but also take digital audio signal into account in the design of HDMI connector, which is not only fully compatible with DVI but also capable of transmitting uncompressed data of digital AV signal without distortion. Furthermore, the HDMI also has advantages, such as, it complies with all kinds of video format specification used in the market, thus, it is capable of communicating with all kinds of product by all kinds of video transmission formats. 
   Therefore, the HDMI provides the best quality and high fidelity video signal for consumer AV products, and because it supports all kinds of transmission format of digital video signal, resulted in less cable and smaller connector for the transmission of uncompressed data. Furthermore, the HDMI also succeeded the feature of unauthorized copy proof of DVI. It will alleviate the burden of movie filmmakers worrying that the export of the highest quality video products will come across with unauthorized reproduction by piracy. The HDMI connector also provides two-way communication for digital TV, DVD player, deck top box (signal converter) and other small connectors of digital AV products. The advantage is that the player provides the best image quality through determining which format is suitable for the received signal automatically. The HDMI connector is more convenient to install inside different AV products, because it is designed to reduce the volume of interface connector significantly. It is known from the mentioned above that the HDMI will be a mainstream connector for AV product in the future. The HDMI will be the first AV standard specification supported throughout the software supplier, system provider and CE (Consumer Electronics) makers in a chain link. Therefore, the HDMI connector needs to be built with a strong construction to comply with the demand of high-speed transmission. The object of the invention is to provide such new type of connector construction for the newly developed system. 
   SUMMARY OF INVENTION 
   The main object of the present invention is to provide a connector for high definition multimedia digital transmission interface. It utilizes a cable connecting means to firstly place the cable in the inner guide slot of the wiring block. The cable will be fixed in a secured array and convenient for soldering automatically. 
   Another object of the invention is to provide a high definition multimedia interface connector, wherein a protrusion and a latch hole were prefabricated respectively on a front and a rear metallic housing assembly for a prompt latch action for the front and the rear shell while receiving an insulated housing assembly therein. 
   Further object of the invention is to provide a high definition multimedia interface connector with an outer shell and a front cover to accommodate the front and rear shells by means of engagement of buckles and notches to enable a prompt latch action for the plastic outer shell and the front cover. 
   To achieve above objects, the HDMI connector in accordance with the present invention comprises an insulated housing assembly, a metallic housing assembly, and a plastic outer shell, wherein the insulated housing assembly further consists of an insertion portion and a wiring block. 
   When a terminal is inserted in the insertion portion, both are latched and secured by means of a multiple locking mechanism. After the combination of the insulated housing assembly is completed, the inserted portion of the insulated housing assembly is inserted into the metallic front shell, the metallic front shell and the insulated housing assembly are further combined by means of engagement of a latch slot at the rear end of the metallic front shell and a latch lug on the insertion portion of the insulated housing assembly, followed by incorporating the combined assembly with the metallic rear shell by means of engagement of the protrusion on the metallic front shell and the latch hole on the metallic rear shell to form a compact assembly. 
   When the insulated housing assembly and the metallic rear shell are in place, an inward projection at two sides of the metallic rear shell is thrust against the flange of the metallic front shell to avoid the metallic housing assembly being loose thereof. 
   Finally, the metallic shell assembly is engaged in the plastic outer shell, and the front cover is attached around the rear part of the metallic front shell, wherein the metallic shell assembly is fixed in the plastic outer shell by means of engagement of the buckles on the front cover and the notches at the front end of the plastic outer shell, and the assembly of the HDMI connector is completed. 

   
     The present invention will be readily apparent to those skilled in the art upon reading the following description of a preferred embodiment of the present invention and upon reference to the accompanying drawings. 
     BRIEF DESCRIPTION OF DRAWINGS 
       FIG. 1  is an exploded view of a HDMI connector in accordance with the present invention; 
       FIG. 2  is an exploded view on the reverse side of a HDMI connector in accordance with the present invention; 
       FIG. 3  is an assembled view of  FIG. 1  at the first stage; 
       FIG. 4  is an assembled view of  FIG. 1  at the second stage, and 
       FIG. 5  is an assembled view of  FIG. 1  at the final stage. 
   

   DETAILED DESCRIPTION 
   With reference to  FIG. 1  and  FIG. 2 , wherein a HDMI connector  1  comprises an insulated housing assembly  10 , a metallic housing assembly  20 , a plastic outer shell  30 , and a front cover  40 . The insulated housing assembly  10  consists of an insertion portion  11  and a wiring block  12 , and the insertion portion  11  is an insertion place for a terminal  5 . 
   The structure of the insertion portion  11  consists of an insertion front  13  at front part and a retainer  14  at rear part thereof. The insertion front  13  is a flat projecting body, which provides two terminal receptacle slots  131  aligned at its top and bottom sides extended from the insertion front  13  at the front part to the retainer  14  at the rear part thereof, and utilizing the curved contour shape at the bottom of both sides of the projecting body to form an accuracy error proof retainer. 
   The retainer  14  jointly constitutes a rectangular body through connection with the insertion front  13 . A plurality of latch lugs  141  embedded on the top and bottom ends are engaged with the latch slots  211  furnished on the metallic front shell  21 , and positioning poles  142  are furnished at the end of the rectangular body, and a parallel stop plate  15  having a hollowed stop slot  151  is extended at the both sides of the rectangular body. A wiring block  12  is a T shape body oriented in horizontal direction having a plurality of guide slots  122  on the side surface of the perpendicular block  121 . The number and the position of the guide slots  122  are in correspondence with the terminal receptacle slots  131  mentioned above. A positioning slot  124  is arranged at the bottom of a flat block  123  in front of the T shape body, wherein positioning slots  124  and positioning poles  142  on the topside of the rectangular body are correspondingly engaged each other, while latch points  125  furnished on the both sides of the T shape body are thus designed to latch with hollowed stop slots  151  erected on stop plates  15  of the rectangular body. 
   The metallic housing assembly  20  consists of a front and a rear portions and the configuration of a metallic front shell  21  is similar to the insertion portion  11  of the insulated housing assembly  10  in order to accommodate the insertion portion  11  therein. A plurality of latch slots  211  and protrusions  212  are furnished on the long side surface of the rectangular body of the metallic front shell  21 , wherein the latch slots  211  are engaged with the latch lugs  141  of the retainer  14  of the insulated housing assembly  10  mentioned above, and the protrusions  212  are engaged with latch holes  221  furnished on the metallic rear shell  22 . The metallic rear shell  22  is a rectangular body having a hollow front portion and a hollow cylinder at rear part with a sufficient space to receive cablings. 
   The latch holes  221  are furnished at the front end of both top and bottom wide surface, the positions of the latch holes  221  and the protrusions  212  on the metallic front shell  21  are correspondingly matched. And a slanting inward projection  222  is furnished at a feasible position of both sides of the narrow surface to retain the rectangular end side of the received metallic front shell  21 . This will prevent the metallic front shell and metallic rear shell  21 , 22  from further longitudinal displacement for loose inner space of the metallic rear shell  22  during combination operation thereof. 
   The plastic outer shell  30  is adapted to receive the metallic rear shell  22  containing the metallic front shell  21  for firmly covering the both therein. There also constitutes a plurality of notches  31  on the front end of the top and bottom sides of the plastic outer shell  30 , and the number and position of notches  31  and buckles  41  on the front cover  40  are correspondingly matched. The front cover  40  has an opening similar to the insertion portion  11  and metallic front shell  21 , so it may confine the rear part of the metallic front shell  21  and retain it at the rectangular part of the metallic front shell  21 , and the buckles  41  are furnished on the top and bottom sides of the frame of the front cover  40 . The terminal  5  is a typical component frequently used, therefore, it will not be described recurrently hereinafter. 
   The assembly process of the preferred embodiment of the present invention is carried out from inside out. The first step of assembly is inserting the cable wires into the plastic outer shell  30  and metallic rear shell  22 , followed by inserting the terminal  5  firstly into the terminal position slot  131  inside the insertion process  11  of the insulated housing assembly  10 , and then the wiring block  12  is aligned with the insertion portion  11  at the rear half part of the retainer  14  and inserted therein, in turn, the positioning slots  124  on the flat block  123  of the wiring block  12  match with the positioning poles  142  on the rectangular part of the retainer  14 . 
   As a result, the top and bottom sides of the flat block  123  are inserted inside the terminal  5  against the top and bottom rows of the same respectively, and the latch points  125  on both T shape side surfaces of wiring block  12  are also latched with the hollowed stop slots  151  on the stop plate  15  of the retainer  14 . The insertion portion  11  of the insulated housing assembly  10  and the rear wiring block  12  may thus obtain a stable fixation through those multiple positioning and locking mechanism securing the terminal within. Then, the cable wires to be welded with terminal  5  is placed in the guide slot  122  on the wiring block  12 , the cable wires and terminal  5  are connected by welding the cable wires onto the terminal  5 . 
   The first assembly step is thus completed as shown in the  FIG. 3 . The second step of assembly is firstly to combine the metallic front shell  21  with the part assembled in the first step, and the latch slots  211  on the rectangular part of the metallic front shell  21  incorporate with the latch lugs  141  of the retainer  14  of the insulated housing assembly  10 , thus the metallic front shell  21  is combined with the assembled parts, and followed by inserting the combined parts into the metallic rear shell  22  with the cable wires passing through therein. The protrusions  212  on the rectangular part of the metallic front shell  21  are latched with latch holes  221  on the metallic rear shell  22 , therefore, the metallic front and rear shell  21 ,  22  are prevented from further vertical displacement by means of the slanting inward projection  222  on both sides of the metallic rear shell  22  thrusting against the side edge of the rectangular part of the accommodated metallic front shell  21 . 
   The second step of assembly is thus completed as shown in  FIG. 4 . The third step of assembly is to attach the front cover  40  around the previously assembled metallic front shell  21  of the metallic housing assembly  20  to retain the rectangular part of the metallic front shell  21 , and move the assembled part into the plastic outer shell  30  with the cable wires passing through therein. Finally, the whole assembly of metallic housing assembly  20  is fixed firmly in the plastic outer shell  30  by means of engagement of the buckles  41  on the front cover  40  latched with the notches  31  on the plastic outer shell  30 , and the complete assembly of the connector is accomplished as shown in  FIG. 5 . 
   From the above description it is understood that the HDMI connector of the present invention is thus fabricated and assembled to form a rigid and compact structure in compliance with the strict requirements. Although the present invention has been described with reference to a preferred embodiment thereof, it is apparent to those skilled in the art that there are a variety of modifications and changes that may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.