IMAGE READER

PROBLEM TO BE SOLVED: To suppress a blackening phenomenon and to prolong the service life of a fluorescent lamp in the case of switching internal electrodes and external electrodes of the fluorescent lamp to emit light. SOLUTION: An image reader that uses the fluorescent lamp 1 having, as a light so...

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Bibliographic Details
Main Author IMOTO YOSHIYA
Format Patent
LanguageEnglish
Published 20.03.2003
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:PROBLEM TO BE SOLVED: To suppress a blackening phenomenon and to prolong the service life of a fluorescent lamp in the case of switching internal electrodes and external electrodes of the fluorescent lamp to emit light. SOLUTION: An image reader that uses the fluorescent lamp 1 having, as a light source for emitting light to an original image, a round tube 2 with fluorescence material that emits light by discharge inside, a pair of internal electrodes A and B arranged inside the tube 2, and a pair of external electrodes (a) and (b) arranged outside the tube 2, and switches to an external electrode mode by applying voltage to the pair of external electrodes (a) and (b) and an internal electrode mode by applying voltage to the pair of internal electrodes A and B for use, is provided with a lamp controller 6 for controlling electric potential VIN with respect to the pair of internal electrodes A and B and electrode potential VH of the external electrode with the higher electric potential between the external electrodes (a) and (b) to a condition that is VIN>VH or VIN VH in the external electrode mode.
Bibliography:Application Number: JP20010279228