TWI554250B - Skin detection method and skin detection device - Google Patents

Description

Skin detection method and skin detecting device

The present invention relates to a method and apparatus, and more particularly to a skin detecting method and a skin detecting device for detecting a moisturizing effect of a skin care product that has been rubbed on a human body.

70% of the human body is water, maintaining the water content of the human body and the skin to make people healthy and radiant. Therefore, in the maintenance of the skin, moisturizing and maintenance is the most basic and most important maintenance. There are a variety of moisturizing skin care products on the market, but each person's skin is different, and the skin care products have different moisturizing effects and persistence. Therefore, a detection device for detecting the moisture content of the skin has been developed. When the skin care product is rubbed, the test device can be used to detect the skin moisture of the skin after the user wears the skin care product.

However, although the detection device can be used to know the moisturizing effect of the skin after using the skin care product, the duration of the moisturizing effect cannot be known. To know the moisturizing effect of the skin care product, the detecting device can only be used regularly. Measuring the moisture content of the current skin, causing inconvenience in use.

Therefore, the first object of the present invention is to provide a testable A skin test method for measuring the duration of a moisturizing action after rubbing a skin care product.

Therefore, the skin detecting method of the present invention is performed by a skin detecting device that stores a critical impedance value, and the skin detecting method includes a step (A), a step (B), a step (C), and a Step (D).

(A) Measure the impedance of a skin after a predetermined time value and generate an impedance measurement signal indicative of a current impedance value.

(B) obtaining an impedance gain according to the current impedance value and the preset time value, the impedance gain being positively correlated with the current impedance value and negatively correlated with the preset time value.

(C) generating an impedance function based on the impedance gain and a time function that follows the exponentially varying time parameter, the impedance function normalizing the positive correlation between the plurality of impedance values and the plurality of time values.

(D) determining the time value corresponding to the critical impedance value according to the critical impedance value and the impedance function as a critical time value.

A second object of the present invention is to provide a skin detecting device capable of detecting a moisturizing duration after a skin is rubbed onto a skin care product.

Therefore, the skin detecting device comprises a measuring module and a control module.

The measurement module measures the impedance of a skin after a predetermined time value and generates an impedance measurement signal indicative of a current impedance value.

The control module stores a critical impedance value, and electrically connects the measurement module to receive the impedance measurement signal, and obtains an impedance gain according to the current impedance value and the preset time value, and the impedance gain and the current impedance The value is positively correlated and is negatively correlated with the preset time value.

The control module then generates an impedance function according to the impedance gain and a time function that follows the exponential change of the time parameter, and the impedance function defines a positive correlation between the plurality of impedance values and the plurality of time values.

The control module further obtains the time value corresponding to the critical impedance value according to the critical impedance value and the impedance function as a critical time value.

The utility model has the advantages that: by finding the impedance function of the skin on which the skin care product is rubbed, calculating the critical time value according to the impedance function and the critical impedance value, and calculating the moisturizing duration, the obtained moisturizing duration is obtained. Know the moisturizing persistence of the skin care products on the skin.

1‧‧‧Measurement module

2‧‧‧Control Module

3‧‧‧ display module

4‧‧‧Communication module

A‧‧‧Measurement steps

B‧‧‧Impact gain step

C‧‧‧Impact function step

D‧‧‧operation critical time value step

E‧‧‧Operation Moisturizing Duration Step

F‧‧‧Display and / or transfer steps

Other features and effects of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is a block diagram illustrating an embodiment of the skin detecting device of the present invention; FIG. 2 is a flow chart illustrating A skin detecting method performed in this embodiment; and FIG. 3 is a graph illustrating the relationship between a plurality of time values of an impedance function of the embodiment and a plurality of impedance values.

Referring to FIG. 1 and FIG. 2, an embodiment of the skin detecting device of the present invention is suitable for detecting a skin care product after the user wipes a skin care product. The moisturizing duration of the skin is maintained on the skin of the user, and the skin detecting device comprises a measuring module 1, a control module 2, a display module 3, and a communication module 4.

The measuring module 1 is used for measuring an impedance value of the skin.

When the skin of the skin care product is rubbed, the humidity of the skin becomes lower and lower with time, and the impedance value of the skin is measured by the measuring module 1, and the impedance value also becomes time-dependent. Increasingly large, each impedance value corresponds to a respective relative humidity value, and the impedance values are inversely related to the relative humidity values, for example, when the relative humidity of the skin is 35%, The corresponding impedance value is about 500 kΩ; when the relative humidity of the skin is 45%, the corresponding impedance value is about 200 kΩ. Therefore, by observing the change in the impedance value, it is possible to estimate the change in the relative humidity value of the skin, and as the impedance value gradually becomes larger, the relative humidity value gradually becomes smaller.

The control module 2 stores a critical impedance value and electrically connects the measurement module 1. In this embodiment, the critical impedance value is set to an average impedance value of the skin of the plurality of users after the skin is rubbed on the skin care product respectively. Therefore, when the skin is the impedance value of the skin, the impedance value is the critical impedance value. When the skin has a very low water content. It should be noted that the setting of the critical impedance value is not limited to the average impedance value of the eighth hour, and may be set to any impedance value of the skin having a very low water content.

The display module 3 is electrically connected to the control module 2 for displaying the moisturizing duration.

The communication module 4 is electrically connected to the control module 2 for transmitting the information of the moisturizing duration to the outside. In this embodiment, the communication module 4 For a Bluetooth module, information on the duration of the moisturization can be transmitted to other electronic devices.

The skin detecting device performs a skin detecting method, and the steps of the skin detecting method are as follows.

Step A: The measurement module 1 measures the impedance of the skin after a preset time value, and generates an impedance measurement signal indicating a current impedance value. The preset time value is related to the time difference from the skin care product to the use of the measurement module 1 to measure the skin time, and the time point at which the skin is rubbed on the skin care product is set to a time zero. In this embodiment, the preset time value is five minutes.

Step B: receiving the impedance measurement signal by using the control module 2, and obtaining an impedance gain according to the current impedance value and the preset time value, the impedance gain being positively correlated with the current impedance value, and the pre- Let the time value be a negative correlation. The equation for this impedance gain is as follows.

Wherein, Gain is the impedance gain, Ω _{tn is} the current impedance value, and Ω ₀ is an initial impedance value, that is, the average impedance value of the skin on the skin care product, t _{n is} the preset time value, μ In addition, the initial impedance value and the curvature parameter may vary with a change in frequency of the measurement module 1 when measuring the skin. In this embodiment, the frequency is 1000 Hz. The initial impedance value is 265.12 kΩ and the curvature parameter is 1.45.

Step C: Using the control module 2 to generate an impedance function according to the impedance gain and a time function that follows an exponential change of a time parameter, the impedance function normalizing a positive correlation between the plurality of impedance values and the plurality of time values It should be said that if the time values are respectively converted into a plurality of time logarithms with a base of 10, the time logarithms are exponentially positively related to the impedance values, as shown in FIG. 3, the equation of the impedance function is as follows As shown, the time value corresponding to any impedance value can be known from the impedance function.

among them, For this time function, t is the time value and Ω _{Estimation is} the impedance value.

Step D: using the control module 2 to obtain the time value corresponding to the critical impedance value according to the critical impedance value and the impedance function, as a critical time value, that is, according to the impedance function, the skin can be obtained. The critical time value corresponding to the critical impedance value when the water content is very low, wherein the critical time value is related to a time difference from the time zero to the impedance value of the skin to the critical impedance value.

Step E: using the control module 2 to subtract the threshold time value from the preset time value to obtain a moisturizing duration. It should be additionally noted that the moisturizing duration can also be defined as subtracting the critical time value from the time zero, which is not limited herein.

Step F: using the control module 2 to generate a prediction result signal carrying the moisturizing duration, and transmitting the prediction result signal to the display module 3 and/or the communication module 4, when the display module 3 Receiving the prediction result signal, and displaying the moisturizing duration, when the communication module 4 receives the prediction result signal, and transmitting the information of the moisturizing duration to the outside.

Therefore, after the user wipes the skin care product of any brand, After the preset time value, the skin detecting device is used to measure the impedance of the skin to generate the current impedance value, and the skin detecting device obtains the skin care product according to the current impedance value and the preset time value. The impedance gain, in turn, yields the impedance function. It should be added that the larger the preset time value is, the more accurate the obtained impedance gain will be, and the balance between convenience and accuracy can be considered from the line setting, which is not limited herein.

In summary, the above embodiment calculates the moisturizing duration according to the measured impedance of the skin and the formulas (1) and (2). Compared with the existing detecting device, the user is more aware of the rubbing. The persistence of moisturizing after the skin care product makes it easier to select a skin care product suitable for oneself, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

A‧‧‧Measurement steps

B‧‧‧Impact gain step

C‧‧‧Impact function step

D‧‧‧operation critical time value step

E‧‧‧Operation Moisturizing Duration Step

F‧‧‧Display and / or transfer steps

Claims (8)

A skin detecting method is performed by a skin detecting device that stores a critical impedance value, and the skin detecting method comprises: (A) measuring a skin impedance after a predetermined time value and generating an indication The current impedance measurement signal of the impedance value; (B) obtaining an impedance gain according to the current impedance value and the preset time value, the impedance gain being positively correlated with the current impedance value, and the preset time value is negative Correlation; (C) generating an impedance function according to the impedance gain and a time function that follows an exponential change of the time parameter, the impedance function normalizing the positive correlation between the plurality of impedance values and the plurality of time values; (D) according to The critical impedance value and the impedance function are used to obtain the time value corresponding to the critical impedance value as a critical time value; and (E) subtracting the critical time value from the preset time value to obtain a moisturizing duration The preset time value is related to a time difference from the skin care product to the skin condition, and the critical time value is related to the impedance of the skin care product from the skin to the skin. When the time difference to the threshold impedance value. The skin detecting method according to claim 1, further comprising: (F) displaying the moisturizing duration, and transmitting the information of the moisturizing duration to the outside. The skin detecting method according to claim 1, wherein the skin is moisturized It varies over time, and each impedance value corresponds to a respective relative humidity value that is inversely related to the relative humidity values. The skin detecting method according to claim 1, wherein in the step (B), the formula of the impedance gain is Wherein Gain is the impedance gain, Ω _{tn is} the current impedance value, Ω ₀ is a starting impedance value, t _{n is} the preset time value, and μ is a curvature parameter. The skin detecting method according to claim 4, wherein in the step (C), the formula of the impedance function is among them, For this time function, t is the time value and Ω _{Estimation is} the impedance value. A skin detecting device comprises: a measuring module, measuring a skin impedance after a preset time value and generating an impedance measuring signal indicating a current impedance value; and a control module for storing a critical impedance And electrically connecting the measurement module to receive the impedance measurement signal, and obtaining an impedance gain according to the current impedance value and the preset time value, the impedance gain being positively correlated with the current impedance value, and The preset time value is a negative correlation, and the control module generates an impedance function according to the impedance gain and a time function that follows an exponential change of the time parameter, the impedance function normalizing the plurality of impedance values and the plurality of time values Positive correlation, the control module further obtains the critical impedance value according to the critical impedance value and the impedance function The time value should be used as a threshold time value, and the control module further subtracts the threshold time value from the preset time value to obtain a moisturizing duration, wherein the preset time value is related to the skin condition A skin care product is applied to measure the time difference of the skin, and the critical time value is related to the time difference from when the skin care product is rubbed from the skin care product to the critical impedance value. The skin detecting device of claim 6, further comprising a display module electrically connected to the control module, the control module generating a predicted result signal carrying the moisturizing duration, and transmitting the predicted result signal to The display module receives the predicted result signal and displays the moisturizing duration. The skin detecting device of claim 6, further comprising a communication module electrically connected to the control module, the control module generating a prediction result signal carrying the moisturizing duration, and transmitting the prediction result signal to The communication module receives the predicted result signal and transmits the information of the moisturizing duration to the outside.