Closed circuit control device for scanner
AssigneeUmax Data Systems Inc.
InventorTsanghuai Chang
Life of this patent
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Abstract
A closed circuit control device for controlling carrier speed of a scanner. An optical meter is attached to the transparent glass panel of a scanner such that an image of the optical meter is formed on an optical sensor such as a charge couple device or a contact image sensor. Image of the optical meter is converted into sense signals by the optical sensor so that speed of the carrier can be accurately computed. Through the acquisition of an accurate carrier speed, scanning speed and direction can be precisely controlled.
Claims12
A closed circuit control device for controlling the scanning speed of a plurality of carriers inside a scanner, comprising:
- a plurality of optical meters attached to a transparent glass panel and an optical sensor inside the scanner, wherein at least two of the optical meters are overlapped to produce digital signals with a cyclical directional pattern, whereby the optical scanner is capable of continuously picking up images of the optical meters during a scanning session and generating corresponding sense signals for controlling speed of a plurality of carriers, and detecting a moving direction according to the cyclical directional pattern.
A closed circuit control method for controlling the carrier of a scanner, comprising:
- forming an image of an optical meter attached to the carrier in an optical sensor and converting the image into sense signals;
- transmitting the sense signals to a computational device for converting frequency of a sense signal to a carrier speed;
- comparing a computed carrier speed with a preset speed;
- reducing speed of a driving motor if the computed carrier speed is greater than the preset speed;
- increasing speed of the driving motor if the computed carrier speed is smaller than the preset speed;
- and
- maintaining speed of the driving motor if the computed carrier speed and the preset speed are identical.
Dependencies are inferred from the claim text.