| 摘要 |
PURPOSE:To obtain a proper exposure result by providing two cathode-ray tubes which have screen panel parts. CONSTITUTION:A control part 10 displays an image based upon a red primary color signal component SR on the screen panel part 12 of a cathode-ray tube 8. On the other hand, an image based upon a blue primary color signal components SR is displayed on a screen panel part 14 by a video signal switching part 7 with a control signal CS2, a filter element 18 is put opposite the panel part for a specific period by a filter switching part 11 under the control of the signal CS2, and then a filter element 19 is put opposite an image based upon a green primary color signal component SG. Then exposure using the image light of the panel 12 by the component SR is performed so as to set capsules selectively, and exposure using image light which is emitted by the image based upon the component SB and image light passage through the element 19 by the component SG is performed for the panel part 14 simultaneously so while their exposure times are controlled independently. Consequently, a proper exposure result is obtained.
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