| 摘要 |
PCT No. PCT/DE96/00755 Sec. 371 Date May 19, 1997 Sec. 102(e) Date May 19, 1997 PCT Filed May 2, 1996 PCT Pub. No. WO96/34745 PCT Pub. Date Nov. 7, 1996A method and apparatus is provided for exposing the recording material. A light beam is generated by a light source. The light beam passes through an optical isolator, through a light modulator, and then exposes recording material point-by-point and line-by-line. The modulator is activated during exposing of each line in an exposing time span, the modulator being deactivated at least at times within a return time span for each line. The optical isolator is enabled during the exposing time span. To compensate for heating of the optical isolator, the optical isolator is also activated for at least a portion of the return time span. A sum of time extents of the exposing time span and the compensation time span are approximately a constant for each line. Activation of the isolator during the compensation time span compensates for thermal effects which occur in the optical isolator as a result of activation and de-activation thereof. Thus, the optical isolator is thermally stabilized and is held at a constant temperature in the exposure time spans and in the return time spans.
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