Abstract:
A flattened antenna oscillator structure has a square frame with an opening in the middle of a lower side. Two vertical oscillator leads parallel to left and right sides are symmetrically arranged inside the frame. Lower ends of the vertical oscillator leads extend into the opening to form feeder contacts. The left and right sides of the frame have plural inward extending matching leads connected with the vertical oscillator leads. The pair of leads at the uppermost end is connected with the upper ends of the vertical oscillator leads. The layout of the antenna oscillator improves the anti-deformation ability of a whole antenna while combining different frequency bands and different frequencies, which improves the signal reception and receiving quality of the antenna oscillator. A variety of modulation structures are further arranged to maximize the receiving power of the antenna and reduce the loss caused by mutual interference between signals.

Description:
FIELD OF INVENTION 
       [0001]    The present invention relates to the field of planar antenna, including the field of the patch antenna, flexible antenna, etc., more particularly it is an antenna oscillator structure. 
       BACKGROUND OF THE INVENTION 
       [0002]    Planar antenna is a novel type antenna structure favored by the consumers due to its thinness, flexibility and space saving advantage. Its basic structure is to arrange distributed antenna oscillator structures on a flexible base board or a base board has certain elasticity. Also bearing certain flexibility or elasticity, the antenna oscillator is a flattened metal structure that can deform along with the deformation of the base board without affecting signal reception. 
         [0003]    Since its invention, the technology of planar antenna has become increasingly mature. Planar antenna can be applied to various fields, such as European patent application: EP0274592A1, UK patent application: GB2487391A, Japan patent application: JPS5665502A, United States patent application: U.S. Pat. No. 3,261,019A, U.S. Pat. No. 3,587,105A, U.S. Pat. No. 3,815,141A, U.S. Pat. No. 6,429,828B1 etc. However, the technical solutions disclosed in these patent documents are limited to receive single frequency band (e.g. UHF or VHF) or simultaneously receive both UHF and VHF with single frequency reception, incapable of receiving multiple frequencies in the same frequency band, therefore the applications are in some degree constrained. 
         [0004]    Another disadvantage exists in prior arts is that the layout of the antenna oscillator is not able to improve the strength of the base board. When in use, the flexible base board will easily deform due to the possible external force such as wind force, and the quality of signal reception is in some degree affected by the structural change of the oscillator caused by the deformation of the base board. 
       SUMMARY OF INVENTION 
       [0005]    The technical problem of the present invention is to overcome the technical inadequacies in the prior arts stated above, and provide an antenna oscillator structure that is able to receive multiple frequencies with a reasonable layout. 
         [0006]    Based on the purpose mentioned above, the present invention is carried out through the following technical solutions. 
         [0007]    The present invention discloses an antenna oscillator structure, which is mounted on one side of a flattened base board of square shape; the oscillator structure comprises a square frame composed of upper, lower, left and right sides, wherein the middle of the lower side is provided with an opening; two vertical oscillator leads parallel to the left and right sides are symmetrically arranged inside the square frame, The lower ends of the vertical oscillator leads extend to the inner side of the opening to form feeder contacts; the left and right sides of the square frame are provided with a plurality of inwardly extending matching leads connected with the vertical oscillator leads, and the uppermost pair of matching leads are connected to the upper ends of the vertical oscillator. Made of insulating material and approximately in square shape, the flattened square base board, which can have round corner design, is used as a support to arrange the metal antenna oscillator structure on its one side. The metal antenna oscillator structure, which is made of metal tinsel cords with almost identical width, can be arranged at the side of the base board by printing, adherence method and so forth. The feeder contacts connect to a circuit board exists in prior arts; the outer side of the base board can have cladding structure; the outer side of the circuit board can have junction ends that connect to the receiving device such as box, television and so forth. 
         [0008]    The present invention employs square frame structure. This structure on the one hand maximizes the reception area, makes signal reception more convenient, and benefits the miniaturization of the entire antenna structure, on the other hand provides a better performance support structure to the whole oscillator structure, preventing the antenna from fracturing during deformation. The characteristic feature of the present invention is the use of multiple pairs of matching leads. One function of the matching leads is to adjust the input impedance of the antenna so that the input impedance of the antenna matches the feeders of the antenna, maximizing the antenna&#39;s receiving power. As another function, the multiple pairs of matching leads and the upper part of the closed square frame form a plurality of composite half-wave folded oscillator structures for receiving different frequencies in UHF frequency band; the multiple pairs of matching leads and the lower part of the closed square frame form a plurality of composite half-wave folded oscillator structures for receiving different frequencies in VHF frequency band. In this way, multiple UHF and multiple VHF antenna oscillators are combined into the same antenna structure, the UHF and VHF frequency bands can be divided to correspond to multiple frequencies, which greatly improve the signal receiving ability of the antenna oscillator. 
         [0009]    Because the antenna oscillator combines signal reception of multiple frequency bands and multiple frequencies, in order to prevent the received electric signal from interfering with each other in the present invention, above the feeder contacts and below the vertical oscillator leads, the reflection adjustment frames are symmetrically arranged at the two sides of the lower ends of the two vertical oscillator leads. By arranging the structure of the reflection adjustment frames reasonably, the reflection coefficient can be reduced to zero; therefore the power loss caused by the signal interference is avoided. The shape of the reflection adjustment frames can be various kinds of structures; based on the layout of the entire antenna structure, the present invention prefers the reflection adjustment frames are closed frames of triangle, semi-circle or semi-ellipse shape that formed with vertical oscillator leads. These structures are not only convenient for adjustment, reducing the testing times, but also stable when in use, without easily subjecting to the influence caused by the overall deformation of the antenna. 
         [0010]    To simplify the structure, reflection adjustment leads symmetrically arranged at the lower two sides of the vertical oscillator leads or below the lowermost pair of matching leads is used to replace the reflection adjustment frame mentioned earlier. The stability of such structure is slightly inferior to the one of reflection adjustment frame, but the structure is simpler and the testing cost is lower. 
         [0011]    In order to extend VHF signal length, the lower two sides at both sides of the square frame&#39;s opening are inwardly bent. Inwardly bent structure enables the whole half-wave symmetric oscillator structure to be covered inside the square frame, without reaching out the square frame. This guarantee the overall area does not increase. In addition, the inwardly bent structure improves the overall strength of the antenna oscillator structure, possessing greater anti-deformation capability and ensuring the quality of signal reception. 
         [0012]    In order to increase the utilization rate of the internal space of the square frame, he lower two sides at both sides of the square frame&#39;s opening are inwardly bent in serpentine manner. The structure of inwardly bent in serpentine manner can not only increase the utilization rate of space, but also increase the density of leads arrangement, which is conducive to enhance the overall level of strength. 
         [0013]    According to the invention concept stated above, the present invention prefers the following embodiments of antenna oscillator structures. 
         [0014]    The first embodiment of the antenna oscillator structure comprises 2˜4 pairs of parallel matching leads, the matching leads are distributed horizontally or upward slantingly between the left/right sides of the square frame and the vertical oscillator leads. This type of structure is relatively simple; the use of parallel matching leads structure is advantageous to evenly distribute the intensity of stress on the whole planar antenna oscillator. 
         [0015]    The second embodiment is that the first and the second pairs of inwardly extending matching leads arranged at the four corners of the square frame are connected to the upper ends of the vertical oscillator leads, compartmentalizing the square frame into four triangle areas; the third and the fourth pairs of inwardly extending matching leads arranged at the middles of the left/right sides of the square frame are connected to the middles of the first and second pairs of matching leads; the middles of the third and the fourth pairs of matching leads are connected by a “V” shape lead. This structure compounds a plurality of different UHF and VHF antenna oscillator inside same area. The structure is complicated, but through this reasonable layout, even distribution of intensity, greater density of leads arrangement per unit area, and homogenous distribution in all directions overall suggested by mechanics analysis, can be achieved. This structure divides the UHF and VHF frequency bands more specifically, that it has broader application area, better signal reception and signal quality, greater strength and anti-deformation ability. 
         [0016]    The third embodiment is that the antenna oscillator structure comprises four pairs of matching leads, the matching leads are distributed in “W” shape between the left/right sides of the square frame and the vertical oscillator leads. Such structure is also a composite of multiple different UHF and VHF antenna oscillators, but the structure is simpler with reasonable layout; it has certain anti-deformation ability. 
         [0017]    The fourth embodiment is that it comprises two pairs of matching leads, the matching leads are arranged oppose to each other that present “V” shape structure, forming a hexagon structure with the left/right sides of the square frame and the vertical oscillator leads. Such structure consists of two different UHF and VHF antenna oscillators, the testing of it is simple and convenient; the structure also has reasonable layout and some anti-deformation ability. 
         [0018]    The reasonable layout of the planar antenna oscillator on the one hand enhances the anti-deformation capability, on the other hand combines the antenna oscillator structures of different frequency bands and frequencies, which greatly improve the signal receiving ability and receiving quality of the antenna oscillator. The present invention further arranges various kinds of adjustment structure that the receiving power of the antenna is maximized and loss caused by signal interference is reduced. Moreover, the layout of the antenna oscillator is further optimized, enabling further miniaturization and strengthening the antenna after employing such layout. Compared to prior arts, the present invention has substantive features and represents a notable progress. 
     
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         [0019]      FIG. 1  is the schematic view of the structure of embodiment #1. 
           [0020]      FIG. 2  is the exploded view of the oscillator of embodiment #1. 
           [0021]      FIG. 3  is the schematic view of the structure of embodiment #2. 
           [0022]      FIG. 4  is the exploded view of the oscillator of embodiment #2. 
           [0023]      FIG. 5  is the schematic view of the structure of embodiment #3. 
           [0024]      FIG. 6  is the schematic view of the structure of embodiment #4. 
           [0025]      FIG. 7  is the schematic view of the structure of embodiment #5. 
           [0026]      FIG. 8  is the schematic view of the structure of embodiment #6. 
           [0027]      FIG. 9  is the schematic view of the structure of embodiment #7. 
           [0028]      FIG. 10  is the schematic view of the structure of embodiment #8. 
           [0029]      FIG. 11  is the schematic view of the structure of embodiment #9. 
           [0030]      FIG. 12  is the exploded view of the oscillator of embodiment #9. 
       
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0031]    The following examples with figures further specify the present invention. The embodiments and figures mentioned above are not intended to limit the invention. Rather, the drawings and embodiments only serve as demonstrations; for better illustration of the embodiments, some parts in the figures can be amplified or reduced that do not represent the actual scale of the product; for person skilled in the art, it is understandable to omit some of the well-known structures shown in the figures. 
       Embodiment #1 
       [0032]      FIG. 1  shows an antenna oscillator structure  100 , mounted on one side of a flattened base board of square shape. The metal antenna oscillator structure  100 , which is made of metal tinsel cords with almost identical width, can be arranged at the side of the base board by printing method. The oscillator structure  100  comprises a square frame  110  composed of upper side  111 , lower side  114 , left side  113  and right side  112 , wherein the middle of the lower side  114  is provided with an opening  115 ; two vertical oscillator leads  120  parallel to the left side  113  and right side  112  are symmetrically arranged inside the square frame  110 , The lower ends of the vertical oscillator leads  120  extend to the inner side of the opening  115  to form feeder contacts  140 ; above the feeder contacts  140  and below the two vertical oscillator leads  120 , the reflection adjustment frames  130  in triangle shape are symmetrically arranged. The left side  113  and right side  112  of the square frame  110  are provided with two inwardly extending matching leads  150 , 160  connected to the vertical oscillator leads  120 , the matching leads  150 , 160  are arranged oppose to each other that present “V” shape structure, forming a hexagon structure with the left side  113 , right side  112  of the square frame  110  and the vertical oscillator leads  120 . The lower two sides  114  at both sides of the square frame&#39;s opening  115  are inwardly bent fold  116 . The feeder contacts  140  connect to a circuit board exists in prior arts, the outer side of the circuit board has junction ends that connect to the receiving devices such as box, television and so forth, which the figure does not show. The base board employs transparent material. 
         [0033]    All constituents of the above mentioned planar antenna oscillator structure  100  form a composite structure of four oscillators, as shown in  FIG. 2 . The upper side  111 , left side  113 , the upper part of right side  112 , the matching leads  150  and the vertical matching leads  120  construct a half-wave folded oscillator  101  for receiving UHF; the upper side  111 , left side  113 , the upper part of right side  112 , the matching leads  160  and the vertical matching leads  120  construct a half-wave folded oscillator  102  for receiving UHF; the left side  113 , lower part of the right side  112 , lower side  114 , the inwardly bent folded structure  116 , the matching leads  150  and the vertical oscillator leads  120  construct a half-wave folded oscillator  103  for receiving VHF; the left side  113 , lower part of the right side  112 , lower side  114 , the inwardly bent folded structure  116 , the matching leads  160  and the vertical oscillator leads  120  construct a half-wave folded oscillator  104  for receiving VHF. General UHF signal frequency band is 470˜860 MHz, half-wave folded oscillator  101 ,  102  of different size can further divide this frequency band into two frequency bands. General VHF signal frequency band is 87˜230 MHz, half-wave folded oscillator  103 ,  104  of different size can further divide this frequency band into two frequency bands. 
         [0034]    From the analysis stated above, this embodiment further divides the receiving frequency band, each distinct oscillator specifically receives its targeted frequency bands, achieving well targeted signal reception and better quality signal reception. 
       Embodiment #2 
       [0035]    As shown in  FIG. 3 , the oscillator structure  200  comprises a square frame  210  composed of upper side  211 , lower side  214 , left side  213  and right side  212 , wherein the middle of the lower side  214  is provided with an opening  215 ; two vertical oscillator leads  220  parallel to the left side  213  and right side  212  are symmetrically arranged inside the square frame  210 , The lower ends of the vertical oscillator leads  220  extend to the inner side of the opening  215  to form feeder contacts  240 . The left side  213  and right side  212  of the square frame  210  are provided with three inwardly extending matching leads  250 ,  260 ,  270  connected to the vertical oscillator leads  220 , the matching leads  250 ,  260 ,  270  mentioned above are arranged horizontally and they parallel to each other. Lower side  214  at both sides of the opening  215  of the square frame  220  inwardly form a serpentine folded structure  216 . 
         [0036]    All constituents of the above mentioned planar antenna oscillator structure  200  form a composite structure of six oscillators, as shown in  FIG. 4 . The upper side  211 , left side  213 , the upper part of right side  212 , the matching leads  250  and the vertical matching leads  220  construct a half-wave folded oscillator  201  for receiving UHF; the upper side  211 , left side  213 , the upper part of right side  212 , the matching leads  260  and the vertical matching leads  220  construct a half-wave folded oscillator  202  for receiving UHF; the upper side  211 , left side  213 , the upper part of right side  212 , the matching leads  270  and the vertical matching leads  220  construct a half-wave folded oscillator  203  for receiving UHF; the left side  213 , lower part of the right side  212 , lower side  214 , the serpentine folded structure  216 , the matching leads  270  and the vertical oscillator leads  220  construct a half-wave folded oscillator  204  for receiving VHF; the left side  213 , lower part of the right side  212 , lower side  214 , the serpentine folded structure  216 , the matching leads  260  and the vertical oscillator leads  220  construct a half-wave folded oscillator  205  for receiving VHF; the left side  213 , lower part of the right side  212 , lower side  214 , the serpentine folded structure  216 , the matching leads  250  and the vertical oscillator leads  220  construct a half-wave folded oscillator  206  for receiving VHF. General UHF signal frequency band is 470˜860 MHz, half-wave folded oscillator  201 ,  202 ,  203  of different size can further divide this frequency band into three frequency bands. General VHF signal frequency band is 87˜230 MHz, half-wave folded oscillator  204 ,  205 ,  206  of different size can further divide this frequency band into three frequency bands. 
         [0037]    From the analysis stated above, this embodiment further divides the receiving frequency band, each distinct oscillator specifically receives its targeted frequency bands, achieving well targeted signal reception and better quality signal reception. 
       Embodiment #3 
       [0038]    As shown in  FIG. 5 , the oscillator structure  300  comprises a square frame  310  composed of upper side  311 , lower side  314 , left side  313  and right side  312 , wherein the middle of the lower side  314  is provided with an opening  315 ; two vertical oscillator leads  320  parallel to the left side  313  and right side  312  are symmetrically arranged inside the square frame  310 , The lower ends of the vertical oscillator leads  320  extend to the inner side of the opening  315  to form feeder contacts  340 . The first pair of inwardly extending matching leads  350  and the second pair of inwardly extending matching leads  360  arranged at the four corners of the square frame are connected to the upper ends of the vertical oscillator leads  320 , compartmentalizing the square frame  310  into four triangle areas; the third pair of inwardly extending matching leads  370  and the fourth pair of inwardly extending matching leads  380  arranged at the middles of the left side  313 , right side  312  of the square frame  310  are connected to the middles of the first pair of matching leads  350  and the second pair of matching leads  360 ; the middles of the third pair of matching leads  370  and the fourth pair of matching leads  380  are connected by a “V” shape lead  390 . Above the feeder contacts  340  and below the two vertical oscillator leads  320 , the reflection adjustment frames  330  in triangle shape are symmetrically arranged. 
         [0039]    From the principle mentioned in embodiment #1 and #2, it is known that such structure can further divide the UHF or VHF TV signal frequency band into multiple frequency bands. 
       Embodiment #4 
       [0040]    As shown in  FIG. 4 , the oscillator structure  400  comprises a square frame  410  composed of upper side  411 , lower side  414 , left side  413  and right side  412 , wherein the middle of the lower side  414  is provided with an opening  415 ; two vertical oscillator leads  420  parallel to the left side  413  and right side  412  are symmetrically arranged inside the square frame  410 , The lower ends of the vertical oscillator leads  420  extend to the inner side of the opening  315  to form feeder contacts  440 . The left side  413  and right side  412  of the square frame  410  are provided with three inwardly extending matching leads  450 ,  460 ,  470  connected to the vertical oscillator leads  420 , the matching leads  450 ,  460 ,  470  mentioned above are distributed in fan shape and they do not parallel to each other. Above the feeder contacts  440 , the reflection adjustment frame  430  in semi-circle shape is symmetrically arranged at the two sides of the lower ends of the two vertical oscillator leads  420 . 
         [0041]    From the principle mentioned in embodiment #1 and #2, it is known that such structure can further divide the UHF or VHF TV signal frequency band into three frequency bands. 
       Embodiment #5 
       [0042]    As shown in  FIG. 7 , the oscillator structure  500  comprises a square frame  510  composed of upper side  511 , lower side  514 , left side  513  and right side  512 , wherein the middle of the lower side  514  is provided with an opening  515 ; two vertical oscillator leads  520  parallel to the left side  513  and right side  512  are symmetrically arranged inside the square frame  510 , The lower ends of the vertical oscillator leads  520  extend to the inner side of the opening  515  to form feeder contacts  540 . The left side  513  and right side  512  of the square frame  510  are provided with three inwardly extending matching leads  550 ,  560 ,  470  connected to the vertical oscillator leads  420 , the matching leads  450 ,  460 ,  570  mentioned above are arranged horizontally and parallel to each other. Above the feeder contacts  540 , the reflection adjustment frame  530  is symmetrically arranged at the two sides of the lower ends of the two vertical oscillator leads  520 . 
         [0043]    From the principle mentioned in embodiment #1 and #2, it is known that such structure can further divide the UHF or VHF TV signal frequency band into three frequency bands. 
       Embodiment #6 
       [0044]    As shown in  FIG. 8 , the oscillator structure  600  comprises a square frame  610  composed of upper side  611 , lower side  614 , left side  613  and right side  612 , wherein the middle of the lower side  614  is provided with an opening  615 ; two vertical oscillator leads  620  parallel to the left side  613  and right side  612  are symmetrically arranged inside the square frame  610 , The lower ends of the vertical oscillator leads  620  extend to the inner side of the opening  615  to form feeder contacts  640 . This structure comprises four pairs of matching leads  650 ,  660 ,  670 ,  680 , the matching leads  650 ,  660 ,  670 ,  680  are distributed in “W” shape between the left side  613  and right side  612  of the square frame and the vertical oscillator leads  620 . 
         [0045]    From the principle mentioned in embodiment #1 and #2, it is known that such structure can further divide the UHF or VHF TV signal frequency band into four frequency bands. 
       Embodiment #7 
       [0046]    As shown in  FIG. 9 , the oscillator structure  700  comprises a square frame  710  composed of upper side  711 , lower side  714 , left side  713  and right side  712 , wherein the middle of the lower side  714  is provided with an opening  715 ; two vertical oscillator leads  720  parallel to the left side  413  and right side  712  are symmetrically arranged inside the square frame  710 , The lower ends of the vertical oscillator leads  720  extend to the inner side of the opening  715  to form feeder contacts  740 . The left side  713  and right side  712  of the square frame  710  are provided with three inwardly extending matching leads  750 ,  760 ,  770  connected to the vertical oscillator leads  720 , the matching leads  750 ,  760 ,  770  mentioned above are distributed in fan shape and they do not parallel to each other. Between the matching leads  770  and the lower side  714 , there are two pairs of reflection adjustment leads  730  with different length. 
         [0047]    From the principle mentioned in embodiment #1 and #2, it is known that such structure can further divide the UHF or VHF TV signal frequency band into three frequency bands. 
       Embodiment #8 
       [0048]    As shown in  FIG. 10 , the oscillator structure  800  comprises a square frame  810  composed of upper side  811 , lower side  814 , left side  813  and right side  812 , wherein the middle of the lower side  814  is provided with an opening  815 ; two vertical oscillator leads  820  parallel to the left side  813  and right side  812  are symmetrically arranged inside the square frame  810 , The lower ends of the vertical oscillator leads  820  extend to the inner side of the opening  815  to form feeder contacts  840 . The left side  813  and right side  812  of the square frame  810  are provided with three inwardly extending matching leads  850 ,  860 ,  870  connected to the vertical oscillator leads  820 , the matching leads  850 ,  860 ,  870  mentioned above are arranged upward slantingly and paralleled to each other. Above the feeder contacts  840 , the reflection adjustment frame  830  in semi-ellipse shape is symmetrically arranged at the two sides of the lower ends of the two vertical oscillator leads  820 . 
         [0049]    From the principle mentioned in embodiment #1 and #2, it is known that such structure can further divide the UHF or VHF TV signal frequency band into three frequency bands. 
       Embodiment #9 
       [0050]    This embodiment is the simplest principle structure embodiment of the embodiments stated above. As shown in  FIG. 11 , an antenna oscillator structure  900  comprises a square frame  910  composed of upper side  911 , lower side  914 , left side  913  and right side  912 , wherein the middle of the lower side  914  is provided with an opening  915 ; two vertical oscillator leads  920  parallel to the left side  913  and right side  912  are symmetrically arranged inside the square frame  910 , The lower ends of the vertical oscillator leads  920  extend to the inner side of the opening  915  to form feeder contacts  940 ; above the feeder contacts  940  and below the two vertical oscillator leads  920 , the reflection adjustment frames  930  in triangle shape are symmetrically arranged. The left side  913  and right side  912  of the square frame  910  are provided with two inwardly extending matching leads  950 , 960  connected to the vertical oscillator leads  920 , the matching leads  950 , 960  are arranged horizontally and paralleled to each other. The lower two sides  914  at both sides of the square frame&#39;s opening  915  are inwardly bent fold  916 . 
         [0051]    All constituents of the above mentioned planar antenna oscillator structure  900  form a composite structure of four oscillators, as shown in  FIG. 12 . The upper side  911 , left side  913 , the upper part of right side  912 , the matching leads  950  and the vertical matching leads  920  construct a half-wave folded oscillator  901  for receiving UHF; the upper side  911 , left side  913 , the upper part of right side  912 , the matching leads  960  and the vertical matching leads  920  construct a half-wave folded oscillator  902  for receiving UHF; the left side  913 , lower part of the right side  912 , lower side  914 , the inwardly bent folded structure  916 , the matching leads  950  and the vertical oscillator leads  920  construct a half-wave folded oscillator  903  for receiving VHF; the left side  913 , lower part of the right side  912 , lower side  914 , the inwardly bent folded structure  916 , the matching leads  960  and the vertical oscillator leads  920  construct a half-wave folded oscillator  904  for receiving VHF. General UHF signal frequency band is 470˜860 MHz, half-wave folded oscillator  901 ,  902  of different size can further divide this frequency band into two frequency bands. General VHF signal frequency band is 87˜230 MHz, half-wave folded oscillator  903 ,  904  of different size can further divide this frequency band into two frequency bands. 
         [0052]    From the analysis stated above, this embodiment further divides the receiving frequency band, each distinct oscillator specifically receives its targeted frequency bands, achieving well targeted signal reception and better quality signal reception. 
         [0053]    The following examples with figures further specify the present invention. The embodiments and figures mentioned above are not intended to limit the invention. Apparently, the embodiments of present invention are only used as examples to illustrate the invention clearly, not to limit the implementation method of the present invention. Person skilled in the art can make changes to the present invention in different forms based on the illustration above. Here it is not necessary and possible to exhaustively list all the embodiments. Any alterations, equal replacement and improvement etc. within the principle and spirit of present invention, should be fallen into the protection scope of the claims of present invention.