US 6,608,301 B2Granted

Single step multi-section exposure scanning method

AssigneeUmax Data Systems Inc.

InventorsRong-Ji Liu, Kuo-Jeng Wang, Tom-Chin Chang

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Abstract

A single step multi-section exposure scanning method for a scanner. The scanner includes a photo-sensor and a stepper motor. The photo-sensor has N rows of sensor cells that correspond to each primary color. The scanning device is driven forward an exposure distance for each revolution of the stepper motor. The single step multi-section exposure scanning method includes the following steps. First, the photo-sensor moves forward one exposure distance. One row of sensor cells is exposed after moving every 1/Nth of the exposure distance. Thereafter, analogue voltages obtained through the exposed row of sensor cells are transmitted to an analogue/digital converter. The above process is repeated until the entire document is scanned.

Claims5

Dependent claims

A single step multi-section exposure scanning method for a scanner having a photo-sensor and a stepper motor, wherein the photo-sensor uses N rows of sensors to process each one of a plurality of primary colors and the stepper motor drives the photo-sensor an exposure distance L for one step of the stepper motor, the scanning method comprising the steps of:

moving an exposure distance along a scan document;
exposing a row of not yet exposed sensor cells after moving each 1/Nth of the exposure distance L;
sending out an analogue voltage obtained from a previous row of sensors when the next row of sensors is exposed;
and
repeating the above steps until the entire document is scanned, whereby for one step of the stepper motor moving the exposure distance L, N sequential times of exposure with respect to the N rows for the primary color are performed.

2 more elements

Dependencies are inferred from the claim text.