Drum type washing machine and drying method thereof

Abstract

A nonvolatile semiconductor memory device which is superior in writing and charge holding properties, including a semiconductor substrate in which a channel formation region is formed between a pair of impurity regions formed with an interval, and a first insulating layer, a floating gate, a second insulating layer, and a control gate over an upper layer portion of the semiconductor substrate. It is preferable that a band gap of a semiconductor material forming the floating gate be smaller than that of the semiconductor substrate. For example, it is preferable that the band gap of the semiconductor material forming the floating gate be smaller than that of the channel formation region in the semiconductor substrate by 0.1 eV or more. This is because, by decreasing the bottom energy level of a conduction band of the floating gate electrode to be lower than that of the channel formation region in the semiconductor substrate, carrier injecting and charge holding properties are improved.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a drum type washing machine, and more particularly, to a drum type washing machine having a short time for drying laundry and a drying method thereof.[0003]2. Description of the Related Art[0004]Generally, a drum type washing machine is designed such that a cylindrical drum in a washing tub is rotated to drop laundry from the upper side of the drum to the lower side of the drum to wash the laundry during the rotation of the drum.[0005]The drum type washing machine has properties such that damage of the laundry caused by tangling of the laundry is relatively less than that in a pulsator type washing machine and an agitator type washing machine and the quantity of washing water used in washing the laundry is relatively less than that in the pulsator type washing machine and the agitator type washing machine.[0006]The drum type washing machine dries the laundry that is completely washed usi...

AI Technical Summary

Benefits of technology

[0016]Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a drying method of a drum type washing machine of controlling temperature of air supplied into a drum, RPM of the drum, and switching a drying heater on or off according to the temperature of air to reduce time for drying laundry and a drum type washing machine using the same.

[0017]It is another object of the present invention to provide a drying method of a drum type washing machine of preventing laundry from damage due to heat of air and reducing power consumption by switching a heater on or off and a drum type washing machine using the same.

Problems solved by technology

However, since the laundry is always dried at the same temperature in the conventional drying method, the laundry may be damaged as the drying cycle is carried out when the laundry is dried at high temperature, and it may take a long time for drying laundry when the laundry is dried at low temperature.

Moreover, since when the laundry is completely dried cannot be detected, the drying cycle may be finished before the drying of laundry is not yet finished, resulting in incomplete drying of the laundry.

Otherwise, the drying cycle is continued even after the drying is finished so that the laundry may be damaged.

Thus, in order to prevent laundry from damage, the conventional drying method dries the laundry at low temperature and as a result, it takes a long time to dry laundry.

Moreover, the laundry may be incompletely dried so that the drying efficiency may be deteriorated.

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