Scanner knowledge introduction
Scanner have a lot of variety, usually, we use followings:
1, Handy scanner. Handy scanner is detrusived as a technic formative product in 1987, it looks like the barcode scanner which is used by cashier in supermarket. Most of Handy scanner use CIS technique, optics distinguish rate is 200dpi, there have black and white, gray rate, colours and so on, usually the colour type is 18digit colour. Some top grade adopt CCD as sensitization parts, can achieve really colour, the effect of scanning is better then others.
2,Small doffer model scanner. This model is the product between handy scanner and flat roof scanner(these year have some new product, because it is internal powersupply and the cubage is very small so it called Notebook scanner), most of this product use CIS technique, optics distinguish rate is 300dpi, have gray rate and colours, colour type is usually 24digit colour. There also have few small doffer scanner use CCD technique, effect of scanning is obviously better then CIS technique products, but regarding the limited of configuration, cubage is obviously bigger then CIS products. Small doffer design is fixup lens of scanner, and move the things which you want to scan, then scan by lens, it's working like the printer, the thing which is for scanning must through machine then take out, hence, the things use for scanning can not be thick. The most advantage of this scanner is, cubage is small, but because of the limite to use, for example, just can use for scanning a very thin paper, range can not bigger then scanner.
3,Flat proof model scanner. Another name is flat model scanner, stage scanner, in current market, most of scanner is flat scanner, that is mainstream in the market. This model's optics distinguish rate between 300dpi-8000dpi, colour digit from 24digi to 48digi, scanning range is A4 or A3. The advantage of flat is seems like to use copycat, just open the top cover of scanner, no matter it is book, newspaper, magazine, photo negative, all of them can be scanned, very convenient, and the effect also is the best then usual scanner.
There also have the big surface scanner for big surface, pen scanner, barcode scanner, negative scanner(please note, it is not flat scanner plus perspective scan, the effect is very good, of cours the price is very high),practicality scanner(it's not the scanner which just have ability to scan practically and flat scanner, it is seems like Digital camera), also have some doffer scanner which is mainly used for industry printing typeset domain and so om.