| 摘要 |
A lampholder and a lamp string device having an automatic bypass device are proposed. A Zener diode is provided in each lampholder. When the light bulb in a lampholder burns out or gets loose, the voltage across the two terminals of the Zener diode rises to the Zener breakdown voltage so that the Zener diode operates in the reverse region to replace the role of the original light bulb, hence keeping the whole circuit intact. Therefore, in the lampholder or the lamp string device having an automatic bypass device, the situation that one light bulb burns out or gets loose to cause the whole circuit to malfunction won't arise. The problem of continuous burnout of light bulb can also be avoided. Moreover, mass production can be accomplished to decrease the labor expenditure so as to effectively lower the overall cost.
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