Optical hair removing device

1. An optical hair removing device comprising:

a light emitting unit for emitting light;

an irradiation unit for irradiating the light emitted from the light emitting unit to body hairs on a skin; and

a control unit for controlling the light emission unit,

wherein the irradiation unit has a movement detection unit for detecting a movement of the irradiation unit on the skin, a contact detection unit for detecting a contact between the irradiation unit and the skin, and a light detection unit for detecting the light emitted from the light emitting unit and light that enters from outside to the irradiation unit through a gap between the irradiation unit and the skin when the irradiation unit is made to contact with the skin, and

the control unit allows the light emitting unit to emit light if the light detection unit indicates that no light enters through the gap, when the light emitting unit is not emitting light.

2. The optical hair removing device of claim 1 , wherein the movement detection unit is a roller encoder.

3. The optical hair removing device of claim 1 , wherein the contact detection unit includes contact switches.

4. The optical hair removing device of claim 1 , wherein the light detection unit is a photoelectric sensor.

5. The optical hair removing device of claim 1 , wherein after the light detection unit detected the light emitted from the light emitting unit, the control unit allows the light emitting unit to emit light again if the movement detection unit detects the movement of the irradiation unit on the skin, and the contact detection unit detects the contact between the irradiation unit and the skin.

6. The optical hair removing device of claim 1 , wherein the control unit controls the light emitting unit to emit light discontinuously.

7. The optical hair removing device of claim 5 , wherein the control unit does not check the movement detected by the movement detection unit when the light emitting unit lights for the first time.

8. The optical hair removing device of claim 1 , further comprising a switch for turning on the light emitting unit,

wherein after the light emitting unit emitted light, the control unit accepts a next turn on signal from the switch only if the movement detection unit detects the movement of the irradiation unit on the skin, or the contact detection unit detects a separation between the irradiation unit and the skin.

9. The optical hair removing device of claim 8 , wherein after the control unit accepted the next turn on signal from the switch, the control unit allows the light emitting unit to emit light if the contact detection unit detects the contact between the irradiation unit and the skin.