Product Description:Bar code scanning device is used to read the bar code information contained in a device, according to
different scanning technology, mainly divided into light pen, CCD, laser scanning device.
Different devices have different range of applications, and the price varies. Enterprises should be based on their actual needs to choose their own barcode scanning equipment .
Weifang barcode based on years of experience, light pen in industrial grade applications almost been eliminated, not suitable for enterprise customers . CCD scanning equipment prices relative to the laser scanning equipment to be low, when the enterprise bulk purchases scanning device, select the CCD scanning device can save costs. However, due to the presence CCD inherent shortcomings, not long-range scanning bar codes and scanning width is quite narrow, so in many cases not suitable for business use.
In fact, on CCD and laser bar code scanning equipment price level, with the same brand for scanning device is in the actual purchase some brands of laser scanning equipment to be lower than other brands CCD scanning device, even if the price is slightly higher, because laser scanning device, the scan time can be shortened, less the number of scans to improve scanning efficiency, the cost from the time to consider the cost of the laser scanning device is much lower than the CCD scanning device . So for barcode scanning larger enterprises, should choose laser bar code scanning equipment .
Bar code scanning equipment categories
Bar code scanning device structure is usually the following parts : a light source, the receiving apparatus, a photoelectric conversion part, the decoding circuit, the computer interface .
Bar code scanning equipment, the basic working principle is: the light emitted by the light source through the optical system is irradiated to the bar code symbol above, the light is reflected back through the optical imaging system in the photoelectric converter, thus producing an electrical signal, the signal is amplified to produce through the circuit an analog voltage, it is irradiated onto the bar code symbol is proportional to the light reflected back, then after filtering, shaping, and forms an analog signal corresponding to the square wave signal, the decoder interprets the computer can directly receive digital signals.
Ordinary bar code scanning devices typically employ the following three techniques: light pen, CCD, laser, they have their own advantages and disadvantages, no one bar code scanning devices can have an advantage in all respects, discussed below each bar code scanning devices work principles and advantages and disadvantages.
Light pen works
Light pen is the first emergence of a hand-held bar code scanning device touch, it is also the most economical form of barcode scanning equipment .
When used, the operator need to light pen touches the surface of the bar through the lens light pen send a small light spot, when the light spot across the bar code from left to right, in the " empty" part of the light is reflected, " Article "part, the light will be absorbed, so the light changes inside the pen to generate a voltage, this voltage by amplifying, shaping for decoding .
The major advantages of the light pen are: in contact with the bar code reading, which is able to clearly read the bar code ; reading code length can be unlimited ; barcode scanning device and other lower cost compared ; no internal moving parts, relatively strong ; small size and light weight.
Light pen Disadvantages: Use light pen are subject to various restrictions, such as in some occasions not suitable for contact reading barcodes ; another only in the relatively flat surface to read the specified density, print quality, good bar, the light pen in order to play its role ; and the operator needs to use after a certain amount of training, such as reading speed, reading angle, and the use of undue pressure reading will affect its performance ; Finally, because it must touch reading, when the barcode is stored in the result arising from improper damaged or above with a layer of protective film, the light pen can not be used ; light pen and the low success rate of the first read error rate is higher.
CCD bar code scanning equipment works
CCD is coupled device (Charg couple device), more suitable for close and touching read, its price is not expensive laser bar code scanning equipment, but no internal moving parts.
CCD bar code scanning apparatus using one or more LED, emitted light can cover the entire bar code, the bar code image is transferred to a row of light detectors, each individual photodiode being stimulated tube samples, the detection of the probe adjacent the result is " black" or "white" or in each blank case, to determine the character code, in other words, CCD barcode scanning device is not read each note "section" or "empty ", but the entire portion of the bar code, and converted into electrical signals can be decoded .
Advantages: Compared with other bar code scanning equipment, CCD barcode scanning equipment is cheaper, but equally there is extensive reading bar code density, easy to use . It weighs lighter than laser bar code scanning equipment, but not as light as a pen to touch only read.
Disadvantages : CCD barcode scanning equipment limitations lies in its depth reading and reading width, you need to read the bar code printed on a curved surface ( such as beverage cans ) when there will be difficulties ; in need of some long-distance reading occasions, such as warehousing, is not very suitable ; CCD popular brands poor performance, resulting in higher failure rate ; want to read the bar code on the relatively wide when, CCD is not a good choice, information is very long or very low density bar codes easily exceed read range of the scanning head, resulting barcode unreadable ; and some take multiple LED bar code scanning equipment, any one of the LED failure will lead to can not read ; most CCD barcode scanning devices read the first time success rate is low and error machine rate.
Laser bar code scanning equipment works
Laser bar code scanning equipment is a variety of scanners relatively high prices, but it can provide the highest indicators of various functions, so in various industries have been widely adopted.
Laser bar code scanning equipment, basic working principle is: the hand-held laser bar code scanning device via a beam of light emitted by the diode laser is irradiated onto a rotating prism or swing back and forth on the mirror, the reflected light through the exposure to the barcode reading window surface, the light reflected through the bar or to return an empty bar code scanning equipment for the collection consists of a mirror, focus, into an electric signal by photoelectric conversion, the signal period or the terminal by scanning the decoding software for decoding .
Hand-held laser bar code scanning equipment is divided into fixed two forms: the hand-held laser guns easy to connect, easy to use and flexible, fixed laser bar code scanning device for reading the most large barcode smaller occasions, effective hands free work .
Advantages : laser bar code scanning equipment can be distinguished for non-contact scanning, typically, more than 30cm in reading distance of the laser bar code scanning device is the only choice ; laser reading a wide range of bar code density, and can read the bar code surface irregularities or through glass or transparent tape reading, because the non-contact reading, it will not damage the barcode labels ; because of its more advanced reading and decoding system, read the first time identified a high success rate, the recognition rate is relatively light pen and CCD faster, but also for poor quality or blurry printing barcode recognition effect is good ; error rate is very low ( only about 1/3000000 ) ; laser bar code scanning equipment shock drop resistance properties, such as : Symbol LS4000 series scanners, can 1.5 m drop resistance concrete .
Disadvantages: laser barcode scanning equipment only drawback is its relatively high prices, but if the purchase price and usage charges from the sum, and CCD barcode scanning equipment is not much difference.
Company Contact:
Contact Name: Chloe
Company Name: Shenzhen Longview Technology Co., Ltd.
Email:
Tel: 86-755-83233013-814
Fax:
Street Address: Tongjian Buildings
2, Shennan Road, Futian District,
Shenzhen, Guangdong, China
Shenzhen, Guangdong
Website:
https://www.aliexpress.com/store/907376
Member name: chloezeng
Country:
China
Member Since: 24 October 2013
Total Leads:
47 chloezeng Import Export Business Leads
Business focus: Barcode Scanner, Barcode Scanner Module, Barcode Printer, Ribbon, Data Collector, Pos System, Cable, Label Sticker
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