FIELD OF THE INVENTION
The present invention relates to an improvement of a bulb, which is used on a miniature bulb assembly of a light string that provides better lighting effect being better than any prior ones.
BACKGROUND OF THE INVENTION
A conventional miniature bulb, as shown in FIG. 1 and 2, includes a transparent glass shell (1) connecting with two conductive wires (11) passing through one end to extend outside. A tungsten wire (12) is connected between top ends of the conductive wires (11) and is perpendicular to the conductive wires (11). A secure wire (13) is provided between the two conductive wires (11) at middle portion for becoming a shunt circuit as the tungsten wire (12) is burn out.
SUMMARY OF THE INVENTION
The present invention is to provide an improved miniature bulb, which can provide better lighting effect by use of the improvement including a convex lens on top of the shell and an inclined connecting tungsten wire between the conductive wires. Now, accompanying with the following drawings, the character of the present invention will be described here and after.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view showing a conventional miniature bulb.
FIG. 2 is a cross-sectional plan view of FIG. 1.
FIG. 3 is a perspective view showing a miniature bulb according to the present invention.
FIG. 4 is a cross-sectional plan view of FIG. 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Please refer to FIG. 3 and 4, the present invention includes a glass shell (2) having two conductive wires (21) for connecting their top end with a tungsten wire (22). The improvement of the present invention is in that the lengths of the two conductive wires (21) are different. The tungsten wire (22) is inclined to be connected between the two conductive wires (22) and has thus a longer length. Further, two secure wires (23) are provided between the two conductive wires (21). The glass shell (2) has its top end to become a convex lens (24) having inner flat and outer convex.
Under such design of the present invention, the inclined tungsten wire (22) has a longer length that can produce more lighting as being electrical connection. And the convex lens (24) on the shell (2) can concentrate the light from the tungsten wire (22) to increase the shining effect of the miniature bulb that will be better than any conventional ones. Moreover, the bulb of the present invention is provided with two secure wires (24) for becoming a shunt circuit when the tungsten wire or one secure wire (24) is broken that provides double protecting purposes.