Top 5 manufacturers of tablet computers in 2011

In producing its own tablet computer called Surface, Microsoft Corp. is entering a market dominated by Apple Inc. Six out of every 10 tablets shipped are iPads, according to research firm IHS iSuppli.

Here are the top five manufacturers of tablets last year:

Apple Inc., maker of the iPad, 40.5 million shipped worldwide, 62 percent share

Samsung Electronics Co., maker of Galaxy line, 6.1 million, 9 percent.

Amazon.com Inc., maker of Kindle Fire, 3.9 million, 6 percent

Barnes & Noble, maker of Nook products, 3.3 million, 5 percent

AsusTek Computer Inc., maker of Transformer line, 2.1 million, 3 percent

Other, 9.4 million, 14 percent

Source: IHS iSuppli