Method of and hair dryer for drying hair using remote sensing of

Details Method of and hair dryer for drying hair using remote sensing of Method of and hair dryer for drying hair using remote sensing of

1998-11-16

2000-02-22

Wilson, John J.

Toilet

Methods

132206, 132211, A45D 2400, A45D 706, A45D 702

Patent

active

060268212

ABSTRACT:
Hair dryer with remote sensing of the moistness of the hair by means of a detector which compares the amount of radiant energy in two absorption bands in the spectrum of light emitted by an infra red source and reflected by the hair. One of the absorption bands is caused by water in the hair. The amount of radiant energy in this absorption band changes significantly during the drying of the hair. The other absorption band is caused by keratin in the hair. The energy in this band changes to a much smaller extent during the drying of the hair. The intensity ratio of the two bands is an indicator for the moistness of the hair and can be employed to control the temperature and/or the air flow of the hair dryer.

REFERENCES:
patent: 4424437 (1984-01-01), Walter et al.
patent: 4595838 (1986-06-01), Kerschgens
patent: 5636318 (1997-06-01), Polaert et al.
patent: 5857379 (1999-01-01), Lulofs et al.

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