| 摘要 |
PROBLEM TO BE SOLVED: To provide a photograph printing device capable of detecting a line sensor signal in high quality by providing the device with an output change-over circuit for selecting and outputting either an even numbered photocell detection signal or an odd numbered photocell detection signal. SOLUTION: An analog multiplexer 35c selects and outputs one of the output signals of two correlation double-sampling circuits 35a, 35b. Therefore, the analog multiplexer 35c functions as an output signal change-over circuit SS which selects and outputs either even numbered photocell detection signal or an odd numbered photocell detection signal. Therefore, since the even numbered photocell detection signal and the odd numbered photocell detection signal are processed by the same AD converter circuit 35e, it is possible to sufficiently suppress an AD conversion error between the even numbered photocell detection signal and the odd numbered photocell detection signal.
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