US 6,176,840 B1 · Ultrasonic cosmetic treatment device

Abstract

Since the electrical impedance of an ultrasonic vibrator may vary according to the contact or non-contact of an application member with the skin, a detection circuit detects the contact or non-contact of the application member with the skin by converting the current the ultrasonic vibrator current into a voltage, and a comparator compares this voltage with a reference voltage. When contact is detected by the detection circuit, a constant-voltage circuit sets the level of the constant voltage output to the ultrasonic oscillation circuit at a standard voltage, but when non-contact is detected, the constant voltage is switched to a lower-level constant voltage. Thus, when non-contact is detected, the level of the ultrasound emitted from the ultrasonic vibrator via the application member is lowered, so that an unnecessary rise in the temperature of the application member is be prevented.

Claims20

Dependent claims

An ultrasonic cosmetic treatment device for treating the skin, comprising:

an ultrasonic vibrator probe that contacts a skin;
an ultrasonic oscillation circuit that moves the ultrasonic vibrator probe;
a detection circuit that converts an impedance of the ultrasonic vibrator into an envelope voltage of an oscillation level and detects contact and non-contact of the ultrasonic vibrator probe with the skin by comparing the envelope voltage of the oscillation level with a reference voltage;
an oscillation control circuit that changes an oscillation output level applied to the ultrasonic vibrator probe when the detection circuit detects a change between the contact and non-contact of the ultrasonic vibrator probe with the skin.

1 more element

An ultrasonic cosmetic treatment device for treating skin, comprising:

a probe having an application member with a skin-contacting surface;
an ultrasonic vibrator attached to a side of said application member opposite from said skin-contacting surface;
and
a housing;
an ultrasonic oscillation circuit having an oscillation output that drives the ultrasonic vibrator;
a detection circuit that converts an impedance of the ultrasonic vibrator into an envelope voltage of an oscillation level and detects contact and non-contact of said application member with a skin by comparing the envelope voltage of the oscillation level with a reference voltage;
and
an oscillation control circuit that lowers a level of the oscillation output in response to a change from contact to non-contact of said application member with the skin, and increases the level of the oscillation output in response to a change from non-contact to contact of said application member with the skin,
wherein said ultrasonic oscillation circuit, said detection circuit and said oscillator circuit are housed in said housing.

6 more elements

Dependencies are inferred from the claim text.

Ultrasonic cosmetic treatment device

Life of this patent

Ultrasonic cosmetic treatment device

Life of this patent

Abstract

Claims20