Reader with high-resolution mode and high-speed mode
AssigneeSharp Kabushiki Kaisha
InventorFumikazu Nagano
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Abstract
A reader having a high-resolution mode and a high-speed mode is disclosed. The reader comprises a CCD sensor, a buffer, a first AD convertor, a second AD convertor, a data selector and a control circuit. The input of the buffer is connected to the CCD sensor through a capacitor and a 5 V power source through an analog switch, and an output of the buffer is connected to the first AD convertor for the high-resolution mode and the second AD convertor for the high-speed mode in parallel. The data selector for selecting an output from the first AD convertor or the second AD convertor and sending it out to the control circuit is connected to the outputs of the first AD convertor and the second AD convertor.
Claims6
A reader having a high-resolution mode and a high speed mode, comprising:
- a CCD sensor for converting a received light into an electrical analog signal;
- a first AD convertor for converting the output analog signal of said CCD sensor into a digital signal;
- a second AD convertor for converting said output analog signal, the bit number of the output digital signal from said second AD convertor being less than that from said first digital signal;
- selecting means for selecting one of the output digital signals of said first and said second AD convertors, the output digital signal from said first AD convertor corresponding to said high-resolution mode and the output digital signal from said second AD convertor corresponding to said high-speed period corresponds to said high-speed mode.
Dependencies are inferred from the claim text.