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    • 1. 发明专利
    • DE3903586C2
    • 1995-02-09
    • DE3903586
    • 1989-02-07
    • HITACHI LTDHITACHI KOKI KK
    • ARIMOTO AKIRASAITO SUSUMUTSUJI YASUYUKINAMIKAWA OSAMUMOCHIZUKI TAKESHI
    • B41J2/44G06K15/12B41J2/455H01S3/10G05D25/00
    • Electric-photosensitive printing is accomplished with an LD providing a laser scanning beam that is modulated to affect printing, and the power output of the LED is maintained constant through negative feedback by a holding voltage provided by a capacitor having its charge determined only during a non-printing portion of the printing period wherein a plurality of sheets are printed. During the non-printing period, contact of the scanning laser beam with the electro-photosensitive material is disabled while the laser beam is maintained on so that its power may be measured and compared with a reference level to provide a feedback signal for controlling the output of the laser beam, particularly the feedback signal being provided to the holding capacitor only during the non-printing portion of the period, and the holding capacitor being isolated from the feedback signal during the printing portion of the period. As a specific embodiment, a rectangular sheet of electric-photosensitive material is replaceable wound around a drum so that its opposite ends are spaced apart to provide a seam to affect the disablement of the laser beam from contracting the electro-photosensitive material during the non-printing portion of the period, and a separate light source used to detect this seam portion to determine the non-printing portion of the period.
    • 4. 发明专利
    • DE3903586A1
    • 1989-08-17
    • DE3903586
    • 1989-02-07
    • HITACHI LTDHITACHI KOKI KK
    • ARIMOTO AKIRASAITO SUSUMUTSUJI YASUYUKINAMIKAWA OSAMUMOCHIZUKI TAKESHI
    • B41J2/44G06K15/12
    • Electric-photosensitive printing is accomplished with an LD providing a laser scanning beam that is modulated to affect printing, and the power output of the LED is maintained constant through negative feedback by a holding voltage provided by a capacitor having its charge determined only during a non-printing portion of the printing period wherein a plurality of sheets are printed. During the non-printing period, contact of the scanning laser beam with the electro-photosensitive material is disabled while the laser beam is maintained on so that its power may be measured and compared with a reference level to provide a feedback signal for controlling the output of the laser beam, particularly the feedback signal being provided to the holding capacitor only during the non-printing portion of the period, and the holding capacitor being isolated from the feedback signal during the printing portion of the period. As a specific embodiment, a rectangular sheet of electric-photosensitive material is replaceable wound around a drum so that its opposite ends are spaced apart to provide a seam to affect the disablement of the laser beam from contracting the electro-photosensitive material during the non-printing portion of the period, and a separate light source used to detect this seam portion to determine the non-printing portion of the period.