Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1989-10-24
1990-08-28
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Illumination systems or details
250226, 315134, 356406, 356418, 356425, 358475, G03B 2774
Patent
active
049529722
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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Braun Fred L.
Hoffman Sandra L.
Kabushiki Kaisha Toshiba
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