CN221285708U - Split type skin parameter detection module - Google Patents

Abstract

The utility model relates to a split type skin parameter detection module which comprises a handheld wireless detection module and a base, wherein the base can detachably bear the detection module. The detection module is provided with a first measurement electrode, a second measurement electrode, a CDC, a memory, a first interface and an energy storage module, wherein the measurement electrode is used for being in contact with skin through an insulating layer to obtain capacitance data reflecting the health state of human skin, the base is provided with a second interface, a controller and a base processing module, and the base processing module is used for processing the capacitance data from the memory. The utility model utilizes capacitance type to detect skin parameters so as to obtain the advantages of arrangement, structural cost, direct measurement and the like, and simultaneously reduces or even eliminates the generation of the human body to ground distributed capacitance C _w so as to achieve the aim of further improving the measurement accuracy.

Description

Split type skin parameter detection module

Technical Field

The utility model relates to the field of skin detection, in particular to a split type skin parameter detection module.

Background

The detection of the health state of human skin, such as the detection of skin parameters such as moisture content, grease content, elasticity and the like in the skin, has important significance for dermatology or cosmetology.

Capacitive measurement schemes are favored in terms of skin detection because of the advantages of easy electrode placement, structural cost, and the ability to directly measure skin parameters, avoiding error interference from indirect detection. For example, the cornea measuring instrument of CK penetrates human skin through a mutual capacitance electric field formed by two measuring electrodes, the dielectric constant in the sensing area is changed due to the addition of water, the content of moisture in the skin can be reflected by detecting the mutual capacitance value of the two measuring electrodes, and the measuring method can also be applied to grease measurement.

For the way in which the skin parameters are measured using capacitance, we have found that the circuit volume on the detection module (e.g. probe) and the supply leads negatively affect the accuracy of the detection. For example, in the case where the human body a is detected by the human body B by the hand-held detection module, it is assumed that AB is not closely spaced, because the power supply wire needs to be externally connected to the ground, the detection module needs to be held by a human body for detection, a forms a loop through the electrode-power supply line-ground-a, and because the circuit is built in the detection module, the circuit is huge, so that B is coupled with the circuit when being held by the hand, the circuit is generated by the circuit-power supply line-ground-B, and the other loop is generated by the circuit-power supply line-ground-B, so that AB forms two human body-to-ground distributed capacitances C _w, in patent 2023104839645, we introduce the adverse effect of the human body-to-ground distributed capacitance C _w on skin detection, because of the existence of C _w, the detection accuracy on skin will bring about slipping. Although we propose at 2023104839645 that the adverse effects of C _w can be ameliorated/eliminated by measuring the series capacitance C _a between the electrode and the skin, if there is another means by which C _w can be reduced or even eliminated, the two in combination will yield more excellent accuracy. The above-mentioned introduction is that the circuit volume and the power supply lead cause negative effects when A detects B, for A hand-held detection module to detect own scene, for example when A presses the probe to the skin of face to detect, two human body parts of hand and face will form the loop too, and will produce C _w too; for the scene that the hand-held detection module A detects B and the hand-held detection module B generates body contact, C _w is also generated, and the detection accuracy is not good.

Disclosure of utility model

The utility model aims to utilize capacitance type to detect skin parameters so as to obtain the advantages of arrangement, structural cost, direct measurement and the like, and simultaneously reduce or even eliminate the generation of the ground distributed capacitance C _w of a human body so as to achieve the aim of further improving the measurement accuracy.

To this end, a split skin component detection module is proposed, comprising:

The handheld wireless detection module is configured to be provided with a first measuring electrode, a second measuring electrode, a capacitance-to-digital conversion circuit (CDC), a memory, a first interface and an energy storage module, wherein the measuring electrode is used for being in contact with the skin through an insulating layer to obtain capacitance data reflecting the health state of the skin of a human body, the capacitance-to-digital conversion circuit is coupled with each measuring electrode and obtains capacitance to be transmitted to the memory, the memory is coupled with the first interface, and the energy storage module is used for providing electric energy required by capacitance detection for the handheld wireless detection module;

The base is configured to detachably bear the handheld wireless detection module and is provided with a second interface, a controller and a base processing module, wherein the second interface is used for being in butt joint with the first interface when the handheld wireless detection module is borne to the base, the controller is respectively coupled with the base processing module and the second interface, the base processing module is used for processing capacitance data from a memory, and the processing is configured to comprise but not limited to external communication and/or data display.

In the skin detection scheme, the handheld detection module supplies power briefly through the built-in energy storage module, the short-term low-power supply requirement of detection can be met, meanwhile, connection between the detection module and the ground is removed, and the circuit in the detection module is reduced in weight through distributing circuits such as display and/or communication to the base, wherein the circuit size comprises a circuit board, impedance between the handheld detection module and an internal circuit is improved, coupling between the handheld detection module and the internal circuit is reduced or even disconnected, in a scene that the handheld detection module of the human body A detects the human body B and the AB contacts the ground, a loop cannot be formed between the handheld detection module A and the ground, a scene that the handheld detection module A detects the B and the ground generate body contact, generation of the loop is reduced or prevented, finally, the distributed capacitance C _w of the human body to the ground is reduced or even eliminated, and precision is improved.

After the detection module is held in the hand, the data is temporarily stored in the memory, and the memory can be powered down to keep data, such as flash, and after the detection module finishes detection and is placed back on the base, the data is processed by the controller and the base processing module through the interface.

In the above-mentioned scheme, the capacitance data reflecting the health state of the human skin may be capacitance data including moisture, grease, elasticity, and the like. For the sake of generality, the moisture detection module, the grease detection module and the elastic detection module may all share the same base.

In the utility model, the handheld wireless detection module can be configured to only keep the function of capacitance detection, so as to achieve the optimization of decoupling.

As an improvement, the housing side wall of the handheld wireless detection module has a grip for guiding the hand-held position of the user, the shortest distance of the grip and the measuring electrode being configured to be at least 41mm. The grip portion may be shaped and/or colored to provide a guide to provide a safe distance between the finger and the electrode in the human body's grip state, isolating the coupling between the two. The shortest distance is configured to be at least 41mm, and aims to achieve the effect of power and area of the electrode on coupling when detecting corresponding parameters of skin, a human body electric field and the like.

On the basis, as a further improvement of the improvement scheme, a capacitance digital conversion circuit (CDC) is arranged on a first PCB board, the first PCB board is realized by using an FPC in consideration of arrangement, the FPC is arranged adjacently to a measuring electrode, wherein the adjacently is understood to be that the length of a connecting line between the measuring electrode and the CDC is lower than 20mm, an analog signal is transmitted from the measuring electrode to the section of line of the CDC, the length of the section of line is controlled by the arrangement of the FPC and the measuring electrode adjacently, the parasitic capacitance of the line can be effectively controlled, and the accuracy is further improved. More preferably, a second PCB board is further provided, and the hard board is used for carrying, the memory and/or the energy storage module is arranged on the second PCB board (if the controller is arranged in the scheme of the detection module, the controller and/or the energy storage module is arranged on the second PCB board), after the first PCB board is separated from the second PCB board, the first PCB board is coupled with the second PCB board through the transmission line, and the digital signal is transmitted from the first PCB board to the second PCB board without affecting the parasitic capacitance, so that the arrangement mode and the position of the transmission line can have a greater degree of freedom and limitation. And to the arrangement of the transmission line between second PCB board to the first interface, can arrange along the inner wall of detection module shell, consider avoiding with the people between the coupling between the hand, can have the center structure spare of hanging in detection module's shell embedment, center structure spare is kept away from the lateral wall because of hanging, thereby this section transmission line arranges in center structure spare thereby ensures to keep away from the staff on the portion of gripping.

In the present utility model, in order to sufficiently isolate the coupling between the finger or palm and the second PCB, the shortest distance between the second PCB and the grip portion is configured to be at least 1mm. On this basis, the preferred setting is that second PCB board and portion of gripping misplace in the horizontal direction, so, do not have the intersection at the projection of horizontal direction between them, hold and PCB's coupling area reduces, can maximize the reduction parasitic capacitance influence, guarantee accuracy. Preferably, the measuring electrode and/or the first interface are/is distributed in the Z-axis direction of the handheld wireless detection module; the holding part is distributed in the X-axis direction of the handheld wireless detection module and is staggered with the second PCB in the Z-axis direction, so that a relatively vertical distribution mode is formed, and the coupling effect is reduced to the greatest extent.

As a further development of this development, the grip is provided with a switch, i.e. the guiding action of the hand-held position is further intensified by the switch to be pressed, by which the detection action can be triggered to be performed in use, e.g. by the user when the electrodes of the detection module are laminated to the skin via insulation. In the utility model, since the power supply mode of the wire is not adopted and the power storage module is adopted for supplying power, the electric quantity stored by the power storage module cannot be set to be too large (in proportion to the volume) to avoid the enhancement of coupling, so that the detection is unsuitable for automatic/all-weather detection, the power is manually controlled by a user when the detection is ready and is used for temporarily, and the method is beneficial to realizing the function and simultaneously ensuring the coupling problem.

As a further development, the energy storage module can be a battery or a capacitor. In view of the fact that the battery is more prone to malfunction than the capacitor, and the power consumption of the detection module is not required in the above design, it is preferable to use the capacitor for power supply of the detection module. On the basis, the base is provided with a charging circuit for charging the energy storage module when the handheld detection module is carried to the base.

As another improvement, the base processing module is provided with a wireless communication module and/or a wired interface which are used for external communication and are coupled to the second interface; and/or the base processing module is provided with a display module coupled to the second interface.

As another improvement, the detection module and the base are configured to be mutually fixed through magnetic attraction, so that the detection module and the base are conveniently mutually fixed and separated.

As a further development, the structural setting is such that the ratio of the series capacitance C _a1 between the first measuring electrode and the human body and the series capacitance C _a2 between the second measuring electrode and the human body is configured to set a known scaling factor k. Wherein the proportionality coefficient k is configured to be equal to 1 or not equal to 1. The scheme that k is equal to 1 can be realized by setting that the normal projection areas of the first measuring electrode and the second measuring electrode corresponding to the human body are the same, and the distance between the first measuring electrode and the human body is the same as that between the first measuring electrode and the second measuring electrode. For the case where k is not equal to 1, this may be achieved by setting the difference in area and/or pitch, for example, setting the area of the first measurement electrode to half the area of the second measurement electrode, or setting the pitch of the first measurement electrode to the human body to 1/3 of the pitch of the second measurement electrode to the human body, or the like.

Furthermore, in the CDC, the first measuring electrode and the second measuring electrode are in contact with the skin through the insulating layer, and the scheme of calculating the component information in the skin by using the series capacitance C _a can be matched with the scheme on the basis of the known proportionality coefficient k, so that the accuracy and the reliability of higher performance are achieved. Specifically, the capacitance-to-digital conversion circuit may be configured to couple the respective measurement electrodes and obtain a first capacitance configured to be one of a first self-capacitance measurement value obtained through the first measurement electrode, a second self-capacitance measurement value obtained through the second measurement electrode, a third self-capacitance measurement value obtained through the first measurement electrode and the second measurement electrode in parallel, and a first mutual capacitance measurement value obtained through the first measurement electrode and the second measurement electrode, the second capacitance being configured to be one of the remaining three; The processing module is used for constructing a first equation taking the human body ground distribution capacitance C _w and the corresponding serial capacitance as variables based on the first capacitance, constructing a second equation taking the human body ground distribution C _w and the corresponding serial capacitance as variables based on the second capacitance, and calculating the serial capacitance C _a1 or the serial capacitance C _a2 by utilizing an equation set formed by the first equation and the second equation and the proportionality coefficient k to output component information in skin. In an actual scene, the first measuring electrode and the second measuring electrode are closely attached to the skin through the insulating layer during detection, the distance between the electrodes and the skin is fixed, so that the ratio of the areas of the first measuring electrode and the second measuring electrode after production and manufacture can be determined by utilizing structural setting so that the proportionality coefficient k (the serial capacitance of one is C _a, the serial capacitance of the other is k x C _a), On the basis, the self capacitance or mutual capacitance of the electrodes is measured twice, and the self capacitance or mutual capacitance is formed by C _w and C _a, so that a function equation of C _w and C _a can be constructed for each measurement, And solving the element of C _w by using an equation set consisting of two equations to construct a monotonic function of C _a, the first capacitor and the second capacitor, and further solving C _a by using the first capacitor and the second capacitor obtained by two measurements. Since C _w is eliminated, the measurement error caused by C _w can be eliminated, and C _a can be accurately measured to reflect the content of skin components, such as moisture content and grease content. In addition, by using a capacitance-to-digital conversion circuit (CDC), such as ADI7142 and ADI7147, and adopting a delta-sigma modulation method to charge and discharge a measured capacitor for many times and compare the measured capacitor with a reference capacitor (see: US Patent Number:5,134,411), the measured capacitance value is directly converted into a digital value, the measurement sensitivity of the capacitor can be improved to 1ff level, the requirement of a measurement system on the measurement sensitivity of the capacitor can be easily met, and particularly, the design of the chips is provided with a plurality of channels, so that the circuit design is simple and convenient, and the cost and the installation difficulty are effectively reduced.

In the above-described embodiment, the controller is placed on the base, i.e. all processing logic is placed on the base for processing, and in a sub-embodiment, the controller may be configured on the detection module, for which purpose another split skin component detection module is provided, comprising:

The handheld wireless detection module is configured to be provided with a first measuring electrode, a second measuring electrode, a capacitance-to-digital conversion circuit, a controller, a first interface and an energy storage module, wherein the measuring electrode is used for being in contact with the skin through an insulating layer to obtain capacitance data reflecting the health state of the skin of a human body, the capacitance-to-digital conversion circuit is coupled with each measuring electrode and obtains capacitance to transmit to the controller, the controller is coupled with the first interface, and the energy storage module is used for providing electric energy required by capacitance detection for the handheld wireless detection module;

the base is configured to detachably bear the handheld wireless detection module and is provided with a second interface and a base processing module, wherein the second interface is used for being in butt joint with the first interface when the handheld wireless detection module is borne to the base, and the base processing module is coupled with the second interface and is used for processing capacitance data from the controller, and the processing is configured to comprise, but is not limited to, external communication and/or data display.

In this scheme, other improvements, such as the distance configuration of the holding part and the measuring electrode, the structural configuration of the first two-PCB board, the central structural member, the transmission line, the distribution mode of the electrode, the holding part and the interface, the coefficient setting between the electrodes, and the like, can be referred to the scheme that the controller is placed on the base, and will not be repeated here.

Drawings

FIG. 1 shows a schematic diagram of a split skin component detection module;

FIG. 2 shows a schematic diagram of a handheld wireless detection module;

FIG. 3 shows a schematic diagram of a detection electrode assembly;

Fig. 4 shows a schematic diagram of a transmission line assembly and a second PCB structure;

FIG. 5 shows a schematic diagram of the hand grip distribution;

FIG. 6 shows a schematic view of a base structure;

FIG. 7 shows a schematic diagram of a distribution structure of detection electrodes;

FIG. 8 is a schematic diagram showing the human body-to-ground distributed capacitance generated by the first and second detection electrodes;

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

As shown in fig. 1, the split skin component detection module mainly comprises two parts, namely, the handheld wireless detection module 100 and the base 200. The base 200 is detachably carrying the handheld wireless detection module 100, and performs data transmission through a fixed interface.

As shown in fig. 2, the handheld wireless detection module 100 mainly includes a detection electrode assembly 110, a second PCB120, a transmission line assembly 130, a first interface 141, and a hand holding portion 150. The detection electrode assembly 110 includes a detection electrode, contacts with the skin of the tested person via an insulating layer, obtains skin parameter information of the tested person, and transmits the skin parameter information to the second PCB120 via the detection electrode transmission line 114 after signal processing, wherein the second PCB120 includes an energy storage module and a memory.

As shown in fig. 3, the sensing electrode assembly 110 mainly includes a first sensing electrode 111, a second sensing electrode 112, a capacitance information processing module 113, a sensing electrode transmission line 114, and a first PCB115. The first detection electrode 111 and the second detection electrode 112 are in contact with the skin of the human body via an insulating layer, which includes but is not limited to an insulating film and an insulating coating, and the capacitance information processing module 113 mainly includes a capacitance-to-digital conversion circuit for obtaining capacitance change information of the first detection electrode 111 and the second detection electrode 112, so as to obtain skin characteristic parameters of the tester, and the first PCB115 is configured as an FPC. The capacitance information processing module 113 is disposed near the first detection electrode 111 and the second detection electrode 112 to reduce interference. The capacitance change information of the first detection electrode 111 and the second detection electrode 112 is processed by the capacitance information processing module 113, converted into a digital signal, and transmitted to the second PCB120 via the detection electrode transmission line.

As shown in fig. 4, the second PCB120 mainly includes a transfer PCB121, an energy storage module 122, a transmission line assembly 130 mainly includes a transmission data line 131, and a central suspension structure 132. The second PCB120 includes an energy storage module 122 that may be configured as a small battery or as a capacitive device, such as a faraday capacitor, that provides short-term test energy. The central suspension member 132 of the transmission line assembly 130 is fixed to the housing, and the transmission data line 131 is disposed inside the central suspension member 132, away from the hand holding portion 150, so as to reduce the data influence of the human body on the measurement result. When the human body A holds the handheld wireless detection module 100 to detect the human body B, the power supply wire needs to be externally grounded, and the A holds the handheld wireless detection module 100, so that the human body A forms a loop through the electrode-power supply line-the ground-A, the B forms another loop through the electrode-power supply line-the ground-B, the A and the B respectively form a pair of ground distributed capacitors C _w, the hand holding part 150 and the internal PCB are powered by using a capacitor device and are misplaced, the connection between the hand holding part and the ground is disconnected, loops cannot be formed among the A, the ground, the B and the ground and the AB, the A hand holds the wireless detection module to detect the B, but the A hand holds the wireless detection module to generate a body contact scene, the loop is reduced or prevented, the ground distributed capacitors C _w of the human body are reduced or even eliminated, and the precision is improved.

As shown in fig. 5, the hand holding portion 150 is not in contact with the transmission line assembly 130 in the X direction, and a gap needs to be maintained, the shortest distance between the detection electrode of the detection electrode assembly 110 and the hand holding portion 150 is at least 41mm, as shown by a distance DA in fig. 5, and the distance between the second PCB120 and the hand holding portion 150 is at least 1mm, as shown by a distance DB in fig. 5.

As shown in fig. 6, the base 200 mainly includes a second interface 210, a base processing module 220, an external interface 230, and a display device 241. The second interface 210 is in butt joint with the first interface 141 of the handheld wireless detection module 100, and then is connected with the second PCB via the transmission line assembly 130, so as to realize data transmission between the handheld wireless detection module 100 and the base 200, and at the same time, the energy storage module 122 can be charged, thereby meeting the short measurement requirement. The second interface 210 and the first interface 141 may be configured to be magnetically attracted, and contact is ensured by virtue of mechanical fixation and magnetic force between the two interfaces, so as to avoid disturbance of signals caused by poor contact. The base processing module 220 includes a communication module, and can transmit data information to a terminal device or a server through the communication module, and can also realize wired data transmission through the external interface 230. The display device 241 can display information such as detection results to an operator in real time for prompting information such as operation progress and operation prompt. The base processing module 200 of the base 200 transfers part of functions into the base 200 to thin the handheld wireless detection module 100, so that the effect of reducing the volume and being convenient to use is achieved.

As shown in fig. 7, the first detection electrode 111 and the second detection electrode 112 respectively form series capacitances C _a1 and C _a2 with the human body, the ratio of C _a1 to C _a2 is configured as K, the proportionality coefficient K may be configured as 1 or not equal to 1, the configuration of the proportionality coefficient K depends on the change of the projection area of the detection electrodes and the human body, and the change of the projection area is selected by the detection electrode design process. As shown in fig. 8, the ratio of C _a1 to C _a2 is configured as K, i.e., the series capacitance of one electrode is C _a, the other electrode is KC _a, the self-capacitance measurement value C _s1 of the first detection electrode 111, the self-capacitance measurement value C _s2 of the second detection electrode 112, the third self-capacitance measurement value C _s3 of the first detection electrode 111 and the second detection electrode 112 are connected in parallel, and optionally two measurement values establish an equation set, so as to perform the elimination operation of C _w, thereby eliminating the influence of human body on the ground distribution capacitance and further accurately measuring the skin characteristic information value of the tester.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (12)

1. A split skin parameter detection module, comprising:

The handheld wireless detection module is configured to be provided with a first measuring electrode, a second measuring electrode, a capacitance-to-digital conversion circuit, a memory, a first interface and an energy storage module, wherein the measuring electrode is used for being in contact with the skin through an insulating layer to obtain capacitance data reflecting the health state of the skin of a human body, the capacitance-to-digital conversion circuit is coupled with each measuring electrode and obtains capacitance to be transmitted to the memory, the memory is coupled with the first interface, and the energy storage module is used for providing electric energy required by capacitance detection for the handheld wireless detection module;

The base is configured to detachably bear the handheld wireless detection module and is provided with a second interface, a controller and a base processing module, wherein the second interface is used for being in butt joint with the first interface when the handheld wireless detection module is borne to the base, the controller is respectively coupled with the base processing module and the second interface, the base processing module is used for processing capacitance data from a memory, and the processing is configured to comprise but not limited to external communication and/or data display.

2. The split skin parameter detection module of claim 1, wherein:

The housing side wall of the handheld wireless detection module is provided with a holding part for guiding the handheld position of a user, and the shortest distance between the holding part and the measuring electrode is configured to be at least 41mm.

3. The split skin parameter detection module of claim 2, wherein: the capacitance-to-digital conversion circuit is arranged on a first PCB, and the first PCB is arranged adjacent to the measuring electrode.

4. A split skin parameter detection module according to claim 3, wherein:

The memory and/or the energy storage module are arranged on the second PCB, and the first PCB is separated from the second PCB and is coupled with the second PCB through a transmission line.

5. The split skin parameter detection module of claim 4, wherein: the shell of the handheld wireless detection module is internally provided with a suspended central structural member, and a transmission line between the second PCB and the first interface is arranged on the central structural member so as to be far away from the holding part.

6. The split skin parameter detection module of claim 4, wherein: the shortest distance between the second PCB and the holding part is configured to be at least 1mm.

7. The split skin parameter detection module of claim 6, wherein: the second PCB board and the holding part are staggered in the horizontal direction.

8. The split skin parameter detection module of claim 7, wherein:

the measuring electrode and/or the first interface are/is distributed in the Z-axis direction of the handheld wireless detection module;

The holding part is distributed in the X-axis direction of the handheld wireless detection module and is staggered with the second PCB in the Z-axis direction.

9. The split skin parameter detection module of claim 2, wherein: the holding part is provided with a switch.

10. The split skin parameter detection module of claim 1, wherein: the energy storage module is configured as a capacitor.

11. The split skin parameter detection module of claim 1, wherein:

The ratio of the series capacitance C _a1 between the first measurement electrode and the human body and the series capacitance C _a2 between the second measurement electrode and the human body is configured to set a known scaling factor k.

12. A split skin parameter detection module, comprising:

The handheld wireless detection module is configured to be provided with a first measuring electrode, a second measuring electrode, a capacitance-to-digital conversion circuit, a controller, a first interface and an energy storage module, wherein the measuring electrode is used for being in contact with the skin through an insulating layer to obtain capacitance data reflecting the health state of the skin of a human body, the capacitance-to-digital conversion circuit is coupled with each measuring electrode and obtains capacitance to transmit to the controller, the controller is coupled with the first interface, and the energy storage module is used for providing electric energy required by capacitance detection for the handheld wireless detection module;

the base is configured to detachably bear the handheld wireless detection module and is provided with a second interface and a base processing module, wherein the second interface is used for being in butt joint with the first interface when the handheld wireless detection module is borne to the base, and the base processing module is coupled with the second interface and is used for processing capacitance data from the controller, and the processing is configured to comprise, but is not limited to, external communication and/or data display.