CCD (Charge Coupled Device)
Barcode Scanners
ram@justransact.com
07-04-2014 00:00:00
CCD (Charge Coupled Device)

A charge-coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for example conversion into a digital value. This is achieved by “shifting” the signals between stages within the device one at a time. CCDs move charge between capacitive bins in the device, with the shift allowing for the transfer of charge between bins.

CCD readers use an array of hundreds of tiny light sensors lined up in a row in the head of the reader. Each sensor measures the intensity of the light immediately in front of it. Each individual light sensor in the CCD reader is extremely small and because there are hundreds of sensors lined up in a row, a voltage pattern identical to the pattern in a bar code is generated in the reader by sequentially measuring the voltages across each sensor in the row. The important difference between a CCD reader and a pen or laser scanner is that the CCD reader is measuring emitted ambient light from the bar code whereas pen or laser scanners are measuring reflected light of a specific frequency originating from the scanner itself.

-K Ramanathan ram@justransact.com


No Comments Yet

Subscribe to comments feed

Leave a Reply

Your email address will not be published. Required fields are marked *

Let's Be Friends
Fb general logo Twitter icon Google Plus icon Youtube icon Pinterest Linkedin
Need help? Contact Us
cs@justransact.com (or) Call us: 1800 123 3010

×
©2013 - 2019 : View site: Desktop 22 years domain experience