Life expiration detector for light source of image processing apparatus
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United States of America Patent
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Aug 28, 1990
Grant Date -
N/A
app pub date -
Oct 24, 1989
filing date -
Oct 26, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image forming apparatus includes a detector for detecting light intensities of light from a light source, and a discrimination unit for obtaining the relative ratio of chroma signals of light with two or more wavelengths at the light intensities of the light source detected by the detector, to thereby discriminate life expiration of the light source. Data of the relative ratio of chroma signals of light with two or more wavelengths at a time of life expiration of the light source is obtained in advance. Thereafter, the light intensity of the light source is detected to obtain the actual relative ratio of the chroma signals of light with two or more wavelengths. Based on these data, the life expiration of the light source is discriminated.
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