Abstract:
A current protection device includes stacking first substrate, support layer, circuit layer, and second substrate. The surface of the first substrate attached to the support layer is an arrangement surface, and the surface of the second substrate attached to the circuit layer is a contact surface. The contact surface has a second recess, and the arrangement surface selectively has a first recess. The recesses serve to release pressure and to ensure the circuit is entirely blown by over current so as to prevent an arc effect. Besides the over current protection for electric equipment, the current protection device can be applied to light and small electronic device.

Description:
FIELD OF THE INVENTION 
     The present invention relates to current protection device, and particular to a current protection device capable of preventing an arc effect and can be applied to light and small electronic device. 
     DESCRIPTION OF THE PRIOR ART 
     Prior fuses are made by two stacking substrates with a fuse arranged between the stacking substrates. Electrode connected to the fuse is arranged to two ends of the solid substrates respectively. 
     While an over current passing through the fuse, the fuse should be blown ideally. However, the fuse might not completely broke by the covering of the solid substrates so that an arc effect might happened. In such case, the fuse can not protect the equipment from damage of the over current. 
     Therefore, such fuse can not be applied to light, small electronic devices and can not fulfill present market demand. 
     SUMMARY OF THE PRESENT INVENTION 
     Accordingly, the primary objective of the present invention is to provide a current protection device can be applied to light and small electronic device for over current protection. The present invention can also prevent an arc effect while a blowing is happening. 
     The recess, auxiliary recess, and the through hole of the present invention serve to ensure the circuit is blown entirely by over current so as to prevent the arc effect for protecting the electronic device from being damaged. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a current protection device of the present invention. 
         FIG. 2  is a cross-section view showing a first embodiment of the present invention. 
         FIG. 3  is a cross-section view partially showing a second embodiment of the present invention. 
         FIG. 4  is a cross-section view partially showing a third embodiment of the present invention. 
         FIG. 5  is a cross-section view partially showing a fourth embodiment of the present invention. 
         FIG. 6  is a cross-section view partially showing a fifth embodiment of the present invention. 
         FIG. 7  is a cross-section view partially showing a sixth embodiment of the present invention. 
         FIG. 8  is a cross-section view partially showing a seventh embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 
     Referring to  FIGS. 1 and 2 , a first embodiment of a current protection device according to the present invention is illustrated. The current protection device includes a first substrate  10 , support layer  11 , circuit layer  12 , second substrate  13 , and two electrodes  14  and  15 . 
     The first substrate  10  and the second substrate  13  is stacked with the support layer  11  and circuit layer  12  arranged between. An arrangement surface  100  of the first substrate  10  is attached to the support layer  11 . The arrangement surface  100  selectively has a first recess  101 . Another surface opposite to the arrangement surface  100  of the first substrate  10  is a display surface  102 . The display surface  102  selectively has a marking  103 . A contact surface  130  of the second substrate  13  is attached to the circuit layer  12 . The contact surface  130  has a second recess  131 . The second recess  131  is larger than the first recess  101 . Another surface opposite to the contact surface  131  is a display surface  132 . The display surface  132  selectively has a marking  133 . The markings  133  and  103  can be specification or words. 
     The electrodes  14  and  15  cover the two ends of the stacking substrates, and the electrodes  14  and  15  are electrically connected to the circuit layer  12 . 
     Referring to  FIG. 3 , a second embodiment of the current protection device according to the present invention is illustrated. Just like the first embodiment, the current protection device includes a first substrate  20 , support layer  21 , circuit layer  22 , second substrate  23 , and two electrodes  24  and  25 . The electrodes  24  and  25  cover the two ends of the stacking substrates. A first recess  200  has the same volume as a second recess  230 . 
     Referring to  FIGS. 4 ,  5 , and  6 , a third, fourth, fifth embodiments of the current protection device according to the present invention are illustrated respectively. Just like the first embodiment, the embodiments respectively include first substrates  30 ,  40 ,  50 , support layer  31 ,  41 ,  51 , circuit layer  32 ,  42 ,  52 , second substrate  33 ,  43 ,  53 , and electrodes arranged to the two ends of those stacking substrates (not shown). First recesses  300 ,  400 , and  500  further have first auxiliary recesses  301 ,  401 , and  501  respectively. Second recesses  330 ,  430 , and  530  further have second auxiliary recesses  331 ,  431 , and  531  respectively. One or both the display surfaces of the first substrates  30 ,  40 ,  50  and the second substrates  33 ,  43 ,  53  have marking. 
     Referring to  FIG. 4 , the first recess  300  is larger than the second recess  330 . 
     Referring to  FIG. 5 , a first recess  400  has the same volume as a second recess  430  does. 
     Referring to  FIG. 6 , a first recess  500  is smaller than a second recess  530 . 
     Referring to  FIG. 7 , a fifth embodiment of the current protection device according to the present invention includes a first substrate  60 , first support layer  61 , first circuit layer  62 , first middle substrate  63 , second support layer  64 , second circuit layer  65 , second substrate  66 , and two electrodes (not shown). 
     An arrangement surface  600  is formed to a surface of the first substrate  60 . The arrangement surface  600  has a first recess  601 . The first support layer  61  and the first circuit layer  62  are arranged above the arrangement surface  600  in order. The middle substrate  63  is arranged onto the first circuit layer  62 . A through hole  630  opposite to the first recess  601  is formed to the middle substrate  63 . The second circuit layer  64  and the second support layer  65  are arranged onto the middle substrate  63  in order. The second substrate  66  is arranged onto the second support layer  65  with a contact surface  660  thereof attached to the second support layer  65 . The contact surface  660  has a second recess  661 . Two electrodes are arranged to the two ends of the stacking substrates of the first substrate  60 , first support layer  61 , first circuit layer  62 , first middle substrate  63 , second support layer  64 , second circuit layer  65 , second substrate  66 , and the electrodes are electrically connected to the first and second circuit layers  62  and  64 . 
     Another surface opposite to the contact surface  600  of the first substrate  60  is a display surface, and another surface opposite to the contact surface  660  of the first substrate  66  is a display surface. The two display surfaces can selectively have a marking. 
     Referring to  FIG. 8 , a sixth embodiment of the current protection device according to the present invention includes a first substrate  70 , first support layer  71 , first circuit layer  72 , first middle substrate  73 , second support layer  74 , second circuit layer  75 , second middle substrate  76 , third circuit layer  77 , third support layer  78 , and second substrate  79 . 
     The first support layer  71 , first circuit layer  72 , first middle substrate  73 , second support layer  74 , second circuit layer  75 , second middle substrate  76 , third circuit layer  77 , third support layer  78 , and second substrate  79  are arranged above the first substrate  70  as a stacking substrate. The second circuit layer  75  has an conducting column  750 , and the conducting column  750  passes through the second support layer  74  and the first middle substrate  73  so that the first circuit layer  72  and the second circuit layer  75  are electrically connected. The third circuit layer  77  has an conducting column  770 , and the conducting column  770  passes through the second middle substrate  76  so that the third circuit layer  77  and the second circuit layer  75  are electrically connected. The first middle substrate  73  has a first through hole  730 , and the second middle substrate  76  has a second through holes  760 . Two electrodes (not shown) are arranged to two ends of the stacking plates. The first circuit layer  72  is electrically connected to one of the two electrodes and the third circuit layer  77  is electrically connected to another. 
     The other surface of the first substrate  70  is a display surface, and the other surface of the first substrate  79  is a display surface. The two display surfaces can selectively have a marking. 
     In the above embodiment, the substrates are ceramic substrates and the conducting columns are made of conducting alloy or conducting composed material. 
     The recess, auxiliary recess, and the through hole serve to ensure the circuit is blown entirely by over current so as to prevent an arc effect. Moreover, the recess, auxiliary recess, and the through hole can also release the pressure while the circuit is blown. 
     The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.