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US 4,297,616 AGranted
Fluorescent lamp with incandescent ballasting systems
AssigneeXerox Corporation
InventorStephen C. Corona
Life of this patent
Estimating the term…
Abstract
Ballasting for a fluorescent lamp is provided by one or more incandescent lamps connected in series between the line voltage source and the fluorescent lamp. Lamp operation is initiated by a triggering pulse applied to a conductive member placed adjacent the fluorescent lamp. In one embodiment, a plurality of incandescent lamps are connected in parallel and are selectively gated into the circuit depending upon exposure requirements for the lamp.
Claims9
An incandescent ballasting circuit for a fluorescent lamp comprising:
- at least one incandescent device connected between an electrical power source and fluorescent lamp,
- means for applying a preheat voltage to the fluorescent lamp filaments, and
- means for applying a trigger voltage to said fluorescent lamp sufficient to initiate lamp discharge
- said triggering voltage means including:
- a conductive plane adjacent to said fluorescent lamp,
- a transformer electrically connected to said conductive plane, and
- a pulse generating circuit connected between said incandescent device and said transformer, said circuit adapted to operate from said power source to generate a high voltage pulse and apply said pulse to said lamp via the transformer and conductive plane, initiating lamp discharge,
- said circuit means further adapted to be disabled following initiation of lamp discharge.
5 more elements
A xerographic copier for exposing a document onto an imaging plane, said copier including:
- an exposure station for relatively uniform illumination of document,
- means for projecting an image of said document onto a photosensitive imaging plane, thereby forming a latent image of said document,
- said exposure station including:
- a fluorescent lamp,
- at least one incandescent device connected between an electrical power line source and the fluorescent lamp,
- means for applying a preheat voltage to the fluorescent lamp filaments, and
- means for applying a triggering voltage to said fluorescent lamp sufficient to initiate lamp discharge
- said triggering voltage means including:
- a conductive plane adjacent to said fluorescent lamp,
- a transformer electrically connected to said conductive plane, and
- a pulse generating circuit connected between said incandescent device and said transformer, said circuit adapted to operate from said power source to generate a high voltage pulse and apply said pulse to said lamp via the transformer and conductive plane, initiating lamp discharge,
- said circuit means further adapted to be disabled following initiation of lamp discharge.
9 more elements
Dependencies are inferred from the claim text.