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Hair treatment device having light-based hair detector

A technology of hair treatment and detector, which is applied to the parts, instruments, sensors, etc. of surgical instruments

Inactive Publication Date: 2014-03-05
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, due to the use of multiple wavelengths, known hair detection units are rather complex devices with multiple optical elements, which must be perfectly aligned in order to obtain a good working of the detection unit

Method used

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  • Hair treatment device having light-based hair detector
  • Hair treatment device having light-based hair detector
  • Hair treatment device having light-based hair detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 A light-based detector 10 for detecting hair constituting a birefringent object for use in a hair treatment device according to the invention is schematically shown. The light-based detector 10 is adapted to detect hair 11 on human or animal skin 12 . Hair detection may be useful in intense pulsed light (IPL)-based or laser-based hair ablation (shaving) or hair removal devices.

[0030] figure 1 The light-based detector 10 comprises a laser source 13 for emitting a laser beam, preferably in the near-infrared or infrared part of the spectrum. For example, light with a wavelength of 785 or 850 nm may be used. A polarizer 19 is used to provide a light beam with a well-defined incident polarization state. The incident polarization state may be a linear or elliptically polarized state. Optical element 18 focuses the polarized light beam onto skin 12 . A control unit 16 coupled to the laser source 13 and / or (parts of) the optical elements 18 controls the exac...

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PUM

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Abstract

A hair treatment device is provided comprising a light-based detector (10) for detecting hair (11) near a skin (12) surface. The light-based detector comprises a light source (13) used for emitting optical radiation of at least a first wavelength and with an incident polarization towards the skin surface. Light sensors (14a, 14b) are provided and used for detecting light reflected at the skin surface. The light sensors (14a, 14b) are capable of respectively detecting the reflected light with the incident polarization and with a different polarization and for providing a PP value representing the detected light with the incident polarization and a CP value representing the detected light with the different polarization. A processor (15) is operative to scale the CP value and the PP value to respective dynamic ranges, to determine a Minimum Intensity Projection (MIP) value by selecting the lowest value of the scaled CP value and the scaled PP value and to discriminate between the skin surface (12) and the hair (11) based on the minimum intensity projection.

Description

technical field [0001] The present invention relates to a hair treatment device comprising a light-based detector for detecting hair close to a skin surface, the light-based detector comprising a light source for emitting optical radiation of at least a first wavelength and with an incident polarization towards the skin surface, comprising a light sensor for detecting light reflected at the skin surface, the light sensor being capable of separately detecting the reflected light having the incident polarization and having a different polarization, the light sensor being configured to provide a detected light representative of the incident polarization and a CP value representative of the detected light having the different polarization, and the light-based detector further includes a processor, coupled to the light sensor and operable to generate Distinguish between the surface and the hair. [0002] The invention also relates to a method for detecting hair close to the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/21G01N21/23
CPCA61B18/203G01N21/23G01N21/21A61B5/448
Inventor A·海因里希F·H·范希施B·瓦格塞N·E·尤曾巴加卡瓦
Owner KONINKLJIJKE PHILIPS NV