Patent Publication Number: US-6664929-B2

Title: Flat typed assembling structure for antenna

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is related to a flat typed assembling structure for an antenna, and especially to a structure which is suitable for connecting of an inner insulation sleeve with an external insulation sleeve for an antenna in a mobile phone, and can make such connecting more stable and reliable, thereby, convenience in processing can be obtained. 
     2. Description of the Prior Art 
     Antennas for mobile phones are divided generally into two kinds, they are the extension type and the fixed type, whichever the type they belong to, antennas for mobile phones are necessary to be miniaturized in meeting the tendency of miniaturization of mobile phones for convenience of carrying. Particularly, miniaturized fixed antennas must have their coils, contact pieces of receiving seats etc. mounted between an inner insulation sleeve and an external insulation sleeve, then the inner and external insulation sleeves are proceeded to connecting. 
     The earlier mobile phones of such kind have their inner insulation and external sleeves connected by applying glue; this mode has the following defects: 
     1. Sizing must wait for curing for connecting, and the structural strength thereof is inferior, the amount of glue in sizing and the areas of connecting are normally uncertain, thereby, quality of connecting of this mode is unstable. 
     2. Sizing at the connecting areas between an inner insulation sleeve and an external insulation sleeve results inferior structural strength, and such structural strength is not desired. 
     3. The chemical nature of such connecting glue generally include corrosion,; it tends to destroy the entire structure of an antenna after using for a long period of time. 
     Sizing for connecting an inner insulation sleeve and an external insulation sleeve of an antenna can have the advantage of fast processing; however, it has the disadvantage of inferior structural strength. There is an injection enveloping-shaping method among the processing methods now available, the coil of an antenna must be placed upright and abutted against the external insulation sleeve and a receiving seat, this is just like the case of the structure of the antenna structure connected by sizing, the helix coil positioned and enveloped in the inner and external insulation sleeves resulted from this injection enveloping-shaping method is very unstable, and thereby the inferiority of such products is overly high. 
     And more, such antennas for mobile phones are mostly of the cylindrical structure, connecting of the inner and external insulation sleeves can be any of various ones to make connecting between the mutually confronting cylindrical walls of the sleeves. The antennas for mobile phones of this kind available now may have various shapes in designing, for example, an antenna structure can be flat which is more beautiful apparently, in this structure, the inner and external insulation sleeves are structurally varied. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a flat typed assembling structure for an antenna, it has an inner insulation sleeve in the shape of a cylinder with its front and rear sides both flattened to be in the shape of a straight plane, and has an external insulation sleeve capable of connecting by slipping over the inner insulation sleeve. A top lid can be cooperatively installed on the top of the external insulation sleeve, the inner end face thereof and the inner insulation sleeve together can position the upper and the lower ends of an internal coil. The inner and the external insulation sleeves can be provided with convex annular ribs and concave annular recesses for connecting of them, to form a more stable and reliable structure which is convenient for processing. 
    
    
     The present invention will be apparent in its novelty and other characteristics after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a preferred embodiment of present invention; 
     FIG. 2 is a sectional view taken from FIG. 2; 
     FIG. 3 is an anatomic perspective view showing the elements of the preferred embodiment of FIG. 1 excluding the internal coil; 
     FIG. 4 is a sectional view taken from FIG. 3 when the present invention is assembled. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the drawings, the antenna of the present invention is comprised of an inner insulating sleeve  10 , an external insulating sleeve  20 , a top lid  30  and an internal coil  40 . 
     The inner insulating sleeve  10  is provided in correspondence in shape with the external insulating sleeve  20  with a seat portion  11  having thereon a cylindrical hollow member  12  with its front and rear sides  13 ,  14  both flattened to be in the shape of a straight plane to thereby leave a front opening  15  and a rear opening  16 , a guiding and connecting stub  17  is provided in the hollow member  12  for placing therein the lower end of the positioning internal coil  40 . The structure is advantageous in that, the flattened front and rear sides  13 ,  14  of the cylindrical hollow member  12  still allow an internal receiving space to be formed to receive therein the coil with a desired specified diameter (4.5 mm) to maintain the electric characteristics of the antenna. The outer surface of the cylindrical hollow member  12  is provided with a plurality of convex ribs. In the preferred embodiment shown, there are a top convex rib  18  and two middle convex ribs  191 ,  192 . The middle convex ribs  191 ,  192  are most preferably provided each with an upper inclined guide surface  193  and a lower horizontal surface  194  to be favorable for insertion connecting on the one hand and for to prevent from separating by an axial force when in engaging on the other hand. 
     The external insulating sleeve  20  is generally a hollow member with a flat cross section, the top surface  21  thereof is provided with a hole  22 , while the bottom thereof is opened, the inner vertical wall thereof is provided with a plurality of concave annular recesses  28 ,  291 ,  292  for connecting with the inner insulating sleeve  10 . Thereby, the inner and the external insulating sleeves  10 ,  20  can be insertion connected with each other. 
     The top lid  30  is preferably plated with chromium, and is provided on the bottom thereof with an engaging means  31  mating with the hole  22  of the external insulating sleeve  20 . So that when the top lid  30  is connected with the top of the external insulating sleeve  20 , the inner end face  32  thereof together with the guiding and connecting stub  17  can make positioning of the upper and the lower ends of the internal coil  40  (referring to FIG.  2 ). 
     The inner and the external insulating sleeves  10 ,  20  of the present invention can thereby be insertion connected with each other directly. During insertion connecting, the two middle convex ribs  191 ,  192  of the inner insulating sleeve  10  slightly expand the external insulating sleeve  20 , and then get in their corresponding concave annular recesses  291 ,  292 ; then by elastic restoring of the material of the external insulating sleeve  20 , the inner and the external insulating sleeves  10 ,  20  can be engaged and positioned by each other. After the two middle convex ribs  191 ,  192  with their corresponding upper inclined guide surfaces  193  and the lower horizontal surfaces  194  are engaged with the concave annular recesses  291 ,  292 , the lower horizontal surfaces  194  form protruding engaging portions to thereby effectively prevent the inner and the external insulating sleeves  10 ,  20  of the whole antenna from separating by an axial pulling force. 
     The present invention thereby can be directly assembled by insertion connecting after injection shaping of the components thereof without additional procedure or equipment for processing. The flat typed antenna assembling structure can thereby firmer and more durable for use.