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Modern cell phone appearance was born in 1987. Compared with the shoulder, it is much lighter and easier to carry. Nevertheless, its weight is still about 750 grams, compared to today's weighs only 60 grams’s mobile phone , it like a big brick. Since then, the development of mobile phones has become more and more rapid. 1991, the phone weighs about 250 grams or so; at the fall of 1996, a volume of 100 cubic centimeters, weight 100 grams of mobile phones appeared. Since then further miniaturization, lightweight, In 1999 there was a weight of 60 grams or less of a cell phone.That is to say, a cell phone is not much more heavy than an egg.
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How Science Has Changed the World We Live in
What changes have modern technology brought to our life?
Clothes become more colorful and beautiful.
Cooking has become more simple and convenient.
1973 mobile phone has been registered patents, but until 1985 was born in the first modern mobile phone. It is the power and antenna placed in a box, the weight of 3 kg, very heavy and inconvenient, the user should carry it like a backpack to carry it to walk, so it is called the shoulder back phone".
The concept of mobile phones appeared in 40s. At that time the United States the largest telecommunications company - Baer laboratory has conducted research. In 1946, the Baer lab made the first mobile phone in human history. But because it is too large, the researchers can only put it on the shelf in the laboratory, and it has been
Changes in the function of mobile phones
Just for talking entertainment and office
Can be both
The birth of a telephone
The phone is probably the most frequently used tool we have today ，And we can hardly leave it 。
So, I can't help wondering, how was the telephone invented?
The emergence of mobile phones
One day in April 1973, a man standing on the streets of New York, took out a wireless phone about two big brick size, and Made a phone call, attracted the attention of passers-by have stopped. This person is the inventor of the cell phone Martin Coop. He was in the United States, a famous technology company Motorola as a engineering and technical personnel
In addition to the quality and volume is more and more small, modern mobile phone is more like a multifunctional Swiss Army knife. In addition to the most basic call feature, the new cell phone can also be used to send and receive messages and short messages, you can surf the Internet, play games, take pictures, and even watch movies! This is the first mobile phone inventor unexpected.