Image reading apparatus
AssigneeSeiko Epson Corporation
InventorToshimitsu Moritaku
Life of this patent
Estimating the term…
Abstract
Since a power supply circuit for a controller (31) and a power supply circuit for a buffer storage unit (32) are independently provided, the power voltage for the buffer storage unit (32) need only be reduced to obtain a corresponding reduction in the amplitude of the signal waveform of digital image data transmitted along an FFC (40), without the operation of the controller (31) being adversely affected. In addition, so long as a coil (47) is located at one position in the internal power supply circuit of a control chip (24), or the external circuit thereof near its power supply circuit, the signal waveform for the digital image data transmitted along the FFC (40) can be attenuated.
Claims8
An image reading apparatus comprising:
- an image input unit for generating analog image data corresponding to optical density data for a document;
- an A/D converter for converting, into digital image data, analog image data received by the image input unit;
- an image processing unit for performing image processing based on the digital image data;
- a control chip, including
- a controller for controlling the image input unit and the A/D converter, and
- a buffer storage unit for transmitting, to the image processing unit, the digital image data output by the A/D converter, wherein a power supply circuit for the controller and a power supply circuit for the buffer storage unit are independently provided;
- and
- a wiring member for electrically connecting the image processing unit and the control chip.
Dependencies are inferred from the claim text.