Lighting unit and discharge lamp

Details Lighting unit and discharge lamp Lighting unit and discharge lamp

2006-03-02

2010-10-26

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

C315S044000, C315S050000

Reexamination Certificate

active

07821207

ABSTRACT:
Provided is a lighting unit and a discharge lamp each of which is capable of causing a capacitor to break down by heat generated in a heat generating component, so that circuit operation is safely terminated without any additional cost. A compact self-ballasted fluorescent lamp is provided with a lighting unit (50) housed in a case. The lighting unit (50) causes an arc tube to emit light and is composed of a plurality of electronic components, including a rectifier/smoothing circuit portion, an inverter circuit portion having transistors (Q1and Q2), a resonant circuit portion, and a preheating circuit portion having a positive temperature coefficient element. Among the plurality of electronic components, the transistors (Q1and Q2) and the positive temperature coefficient element generate excessive heat when, for example, the lamp is operated at the end of electrode's life. Capacitors (C4and C6) disposed in the vicinity of the positive temperature coefficient element would break down by heat in a short mode.

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