CN215874639U - Detection device for biological characteristic information and electronic equipment - Google Patents

Abstract

The embodiment of the application discloses a detection device for biological characteristic information and electronic equipment. This detection device is applied to the electronic equipment including the button, is provided with the cavity in the casing of this button, and detection device includes that photoplethysmography detects the module, and photoplethysmography detects the module and includes: a light transmissive cover plate, a first light source and a first light detector; photoelectric pressure sensor, it stacks up the setting with photoplethysmography detection module, and is located inside the casing of electronic equipment, includes: the device comprises a base, a cantilever beam, a second light source and a second light detector. The detection device provided by the embodiment of the application has high measurement accuracy and is convenient to carry.

Description

Detection device for biological characteristic information and electronic equipment

Technical Field

The present application relates to the field of electronic technologies, and in particular, to a device and an electronic apparatus for detecting biometric information.

Background

In recent years, with the rapid development of electronic technology, people pay attention to how to monitor the biological characteristic information of a human body in real time so that a user can know the physical state of the user at any time to prevent diseases.

For example, blood pressure measurement plays an important role in physical health assessment, physical recovery, and the like, and blood pressure measurement devices are mainly classified into invasive measurement and non-invasive measurement at present. Among them, compared with invasive detection, noninvasive detection has the advantages of simple and convenient measurement method, continuous detection, high universality of measurement objects, short detection time, and the like, and is gradually popularized. In recent years, people have more and more demands for mobile terminals and wearable devices with functions of blood pressure detection or auxiliary blood pressure physiological parameter measurement. Blood pressure monitoring devices can be classified into cuff-type blood pressure monitors and cuff-less blood pressure monitors, and cuff-type blood pressure monitors have high accuracy, but are bulky and not easy to carry, and therefore, cuff-less blood pressure monitors are a main development direction of blood pressure monitoring devices in recent years.

The sensors commonly used at present for measuring blood pressure are piezoresistive sensors and capacitive pressure sensors. The piezoresistive sensor is high in material cost and complex in installation process and fitting process. The capacitance type pressure sensor has the problem of temperature drift, so that the measurement precision of the capacitance type pressure sensor is insufficient, and the scene needing accurate quantitative measurement cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a blood pressure measuring device, which can solve the problem of insufficient measurement accuracy in the prior art.

In order to solve the above technical problem, an embodiment of the present invention discloses a detection apparatus for biometric information and an electronic device:

in a first aspect: the utility model provides a detection apparatus for biological characteristic information, is applied to electronic equipment, its characterized in that, this electronic equipment includes the button, is provided with the cavity in the casing of this button, and this detection apparatus includes:

a photoplethysmography detection module, the photoplethysmography detection module comprising: the light-transmitting cover plate is reused as a partial shell of the key and used for receiving the pressing of a user, the first light source and the first light detector are arranged in the cavity, the first light source is used for transmitting an optical signal of a target waveband to a pressing part of the user at the position of the light-transmitting cover plate, and the first light detector is used for receiving the optical signal reflected and/or transmitted by the pressing part to form a first pulse wave signal of the user.

The photoelectric pressure sensor is stacked with the photoplethysmography detection module and is positioned in the electronic equipment, the photoelectric pressure sensor comprises a base, a cantilever beam, a second light source and a second light detector, the fixed end of the cantilever beam is fixed on the base, the other end of the cantilever beam is a suspension end, and the photoplethysmography detection module is arranged above the cantilever beam; the second light source and the second light detector are relatively fixed on the base, the suspended end is used for displacing when the user presses the light-transmitting cover plate to change the light signals received by the second light detector, the second light detector is used for acquiring pressure signals applied to the light-transmitting cover plate by the user according to the light signals, the first pulse wave signals are corresponding pulse wave signals when the user applies the pressure signals, and the pressure signals and the first pulse wave signals are used for detecting biological characteristic information of the user.

According to the embodiment of the application, the photoplethysmography detection module is used for detecting a first pulse wave signal when a user presses, and the first pulse wave signal is a pulse wave signal corresponding to a pressure signal pressed by the user. Meanwhile, the photoelectric pressure sensor stacked with the photoplethysmography detection module is used for detecting a pressure signal pressed by the user, and the biological characteristic information, such as blood pressure information, can be acquired by counting and calculating the first pulse wave signal and the pressure signal. Compared with a structure using a piezoresistive sensor or a capacitive pressure sensor in the prior art, the material cost is low, the installation process and the attaching process are simplified, and the detection precision is high. Compared with a cuff type blood pressure detection structure, the structure provided by the utility model meets the requirements of miniaturization and portability. Furthermore, the light-transmitting cover plate of the photoplethysmography detection module is multiplexed as a part of the shell of the key for receiving the pressing of the user, and the photoelectric pressure sensor and the photoplethysmography detection module are stacked and arranged inside the shell of the electronic device, so that the volume of the electronic device can be reduced, the appearance of the electronic device is not affected, and the portability of the detection device is improved.

In some possible embodiments, the photoplethysmography detection module further comprises: a substrate for supporting the first light source and the first light detector; the shell is arranged at the peripheral edge of the substrate and used for supporting the light-transmitting cover plate; the shell and the substrate are reused as a shell of the first key, and the light-transmitting cover plate, the shell and the substrate are enclosed to form the cavity in the key.

In some possible embodiments, the photoplethysmography detection module further comprises: the light blocking piece is clamped in the center of the cavity and divides the cavity into a first sub-cavity and a second sub-cavity, the first light source is arranged in the first sub-cavity, and the first light detector is arranged in the second sub-cavity; the first transparent piece is filled in the first sub-cavity; and the second transparent piece is filled in the second sub-cavity.

In some possible embodiments, the detection device further comprises: and the supporting piece is clamped between the photoplethysmography detection module and the photoelectric pressure sensor.

In some possible embodiments, the surface area of the upper surface of the support is greater than the surface area of the lower surface of the photoplethysmography detection module, which is comparable to the surface area of the upper surface of the cantilever beam of the photoelectric pressure sensor.

In some possible embodiments, a connection line between the center of the lower surface of the photoplethysmography detection module and the center of the suspended end of the cantilever beam is perpendicular to a horizontal plane.

In some possible embodiments, the first light source includes a first light emitting element and a second light emitting element, and the first light source can emit light signals of two different target wavelength bands.

In some possible embodiments, the two different target bands of optical signals are red light and infrared light, respectively.

In some possible embodiments, the light emitting center of the second light source is disposed opposite to the light sensing center of the second light receiver, and during the detection of the biometric information, the second light source and the second light detector form a light passing path, and the movement path of the free end of the cantilever beam intersects with the light passing path.

In some possible embodiments, the upper surface of the base is provided with a first groove disposed below the free end of the cantilever beam along the width direction of the base, and the second light source and the second light detector are disposed at two ends of the first groove opposite to each other.

In some possible embodiments, the upper surface of the base is provided with:

the first groove is arranged below the suspended end of the cantilever beam along the width direction of the base;

the second groove and the third groove are oppositely arranged along the length direction of the base, the second groove is positioned on the left side of the hanging end, the third groove is positioned on the right side of the hanging end, the second light source and the second light detector are oppositely arranged along the length direction of the base, and at least one of the second light source and the second light detector is arranged in the second groove.

In some possible embodiments, the second light source and the second light detector are fixed on the upper surface of the base along the width direction of the base and are arranged below the free end of the cantilever beam, and the light emitting center of the second light source and the light sensing center of the second light detector face to the lower surface of the free end.

In some possible embodiments, the base is provided with a first groove along a width direction, the second light source and the second light detector are arranged on a surface of the first groove, and a light emitting center of the second light source and a light sensing center of the second light detector face a lower surface of the suspended end.

In some possible embodiments, the maximum displacement of the free end of the cantilever beam is less than or equal to 3 mm.

In some possible embodiments, the free end of the cantilever beam is provided with a light blocking valve for blocking the light passing path.

In some possible embodiments, the light blocking valve is formed by extending the free end downward.

In some possible embodiments, the light barrier valve is fixed at the free end and perpendicular to the cantilever beam.

In some possible embodiments, the second light source is pulsed.

In some possible embodiments, the material of the transparent cover plate is plastic or glass covered with a light homogenizing film, and the transparent cover plate only allows the optical signal of the target wavelength band to pass through.

In some possible embodiments, the photoplethysmography detection module is shaped as a narrow strip.

In some possible embodiments, the key is disposed on a side or a back of the electronic device.

In some possible embodiments, the key is reused as a function key of the electronic device.

In some possible embodiments, the key is multiplexed as a power key or a volume key on the side of the electronic device.

In a second aspect, an electronic device is provided: the method comprises the following steps: the apparatus for detecting biometric information in the first aspect or any one of the possible embodiments of the first aspect.

In some possible embodiments, the electronic device is a wearable device or a cell phone.

Drawings

Fig. 1 is a schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a photoplethysmography detection module according to an embodiment of the present disclosure;

FIG. 3 is a schematic top view of an opto-electronic pressure sensor in accordance with an embodiment of the present application;

fig. 4 is a schematic side view of a biometric information detection apparatus according to an embodiment of the present application;

FIG. 5 is a schematic diagram of one configuration of the electro-optic pressure sensor of FIG. 3 without the cantilever beam;

FIG. 6 is a schematic structural diagram of an optoelectronic pressure sensor according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an optoelectronic pressure sensor according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of an optoelectronic pressure sensor according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an optoelectronic pressure sensor according to an embodiment of the present application;

FIG. 10 is a schematic view of another configuration of the electro-optic pressure sensor of FIG. 9 without the cantilevered beam;

fig. 11 is a schematic top view of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In this application, the directional terms "upper", "lower", "front", "rear", and the like are defined with respect to the schematically-disposed orientation of the components in the drawings, and it is to be understood that these directional terms are relative concepts that are used for descriptive and clarity purposes and that will vary accordingly depending on the orientation in which the components are disposed in the drawings.

In addition, unless a specified order is explicitly stated in the context of the present application, the process steps described herein may be performed in a different order than specified, i.e., each step may be performed in the specified order, substantially simultaneously, in a reverse order, or in a different order.

In the prior art, a piezoresistive sensor and a capacitive pressure sensor are adopted to measure blood pressure, so that the material cost is high, the laminating process is complex, and the problems of temperature drift and insufficient measurement precision exist.

In order to solve the above problem, in particular, the present application is applicable to a biometric information detection apparatus, which can be applied to various types of electronic devices, such as wearable devices, mobile phones, tablet computers, mobile medical devices, and the like, wherein the wearable devices can include at least one of the following devices: a watch, bracelet, foot chain, necklace, glasses, or head-mounted device; the ambulatory medical device may include at least one of the following devices: blood glucose monitoring equipment, heart rate monitoring equipment, blood pressure measuring equipment, body temperature measuring equipment and the like, and the embodiment of the application does not limit the equipment.

Fig. 1 is a schematic structural diagram of a biometric information detection apparatus according to an embodiment of the present application. As shown in the figure, the biometric information detection device 10 includes: a photoelectric volume pulse wave trace detection module 11 and a photoelectric pressure sensor 12. The photoplethysmography detection module 11 may detect a first pulse wave signal of a user; the photoelectric pressure sensor 12 can acquire the pressure signal applied by the user on the photoplethysmography detection module 11. The photoelectric pressure sensor 12 and the photoplethysmography detection module 11 are stacked and located inside the electronic device. And obtaining the biological characteristic information to be detected by counting and resolving the first pulse wave signal and the pressure signal.

Fig. 2 is a schematic structural diagram of a photoplethysmography detection module according to an embodiment of the present disclosure. As shown, the photoplethysmography detection module 11 includes: a light transmissive cover 111, a first light source 112 and a first light detector 113. The light-transmitting cover 111 is configured to receive a user's pressing, the first light source 112 and the first light detector 113 are disposed in the cavity, the first light source 112 is configured to emit a light signal in a target wavelength band to a pressing portion of the user at the light-transmitting cover, and the first light detector 113 is configured to receive the light signal reflected and/or transmitted by the pressing portion to form a first pulse wave signal of the user.

In some possible embodiments, the first pulse wave signal is a photoplethysmography (PPG) signal measured by a PPG method.

Specifically, the first Light source 112 may be a Light Emitting element such as a Light Emitting Diode (LED), an organic Light Emitting Diode, or a phosphor, and is capable of Emitting an optical signal of a target wavelength band (e.g., red Light) or an optical signal such as infrared Light to the finger of the user; the first photodetector 113 may be a photoelectric conversion element such as a Photodiode (PD), a phototransistor, a silicon-based photodiode, an avalanche photodiode, or a photomultiplier, and may receive an optical signal reflected by or transmitted through a finger of a user.

With continued reference to fig. 2. As shown, the photoplethysmography detection module 11 further includes: a substrate 114 and a housing 115. The substrate 114 is used for supporting the first light source 112 and the first light detector 113, and the housing 115 is disposed at the peripheral edge of the substrate 114 for supporting the light-transmissive cover plate 111.

It should be understood that in embodiments having support 13 (as shown in fig. 4), substrate 114 is not necessary as support 13 may also be used to support first light source 112 and first light detector 113.

With continued reference to fig. 2. As shown, the photoplethysmography detection module 11 further includes: the light blocking member 116 is clamped in the center of the cavity, and divides the cavity into a first sub-cavity 117 and a second sub-cavity 118, the first light source 112 is arranged in the first sub-cavity 117, and the first light detector 113 is arranged in the second sub-cavity 118; the first transparent member 119 is filled in the first sub-cavity 117, and the second transparent member 120 is filled in the second sub-cavity 118.

The light blocking member 116 is located between the first light source 112 and the first light detector 113 to prevent the light signal emitted by the first light source 112 from directly entering the first light detector 113. The material of the light blocking member 116 may be black light absorbing plastic or high reflectivity plastic to block the light signal emitted by the first light source 112 directly to the first light detector 113.

The material of the first transparent member 119 and the second transparent member 120 may be polymethyl methacrylate (PMMA) or Polycarbonate (PC) to improve the light efficiency of the first light source 112, and theoretically, the light efficiency can be improved by 2-3 times in this embodiment, so as to reduce the power consumption of the system.

With continued reference to fig. 2, as shown, the first light source 112 includes a first light emitting element 1121 and a second light emitting element 1122, and the first light source 112 can emit light signals of two different target wavelength bands.

Further, the optical signals of the two different target bands are red light (with a wavelength range of 600nm to 700nm) and infrared light (with a wavelength range of 760nm to 1mm), respectively. By adopting the embodiment of the scheme, the accuracy of the detection of the biological characteristic information can be improved.

In some embodiments, the light-transmissive cover 111 only allows light signals of a target wavelength band, illustratively red light (wavelength range 600nm to 700nm) and infrared light (wavelength range 760nm to 1mm) to pass through. The material of the light-transmissive cover plate 111 may be plastic.

In other embodiments, the transparent cover plate 111 may be made of glass covered with a light homogenizing film to beautify the appearance of the photoplethysmography detection module 11 and improve the performance thereof, thereby providing a good user experience.

Further, the haze degree of the above-mentioned light-leveling film was more than 83%.

Fig. 3 is a schematic top view of an opto-electronic pressure sensor according to an embodiment of the present application. As shown, the photoelectric pressure sensor 12 includes: the optical detector comprises a base 121, a cantilever beam 122, a second light source 123 and a second light detector 124, wherein a fixed end 125 of the cantilever beam 122 is fixed on the base 121, and the other end of the cantilever beam 122 is a suspended end 126. The second light source 123 and the second light detector 124 are fixed to the base 121, the free end 126 is configured to displace when a user presses the light-transmitting cover 111, so as to change a light signal received by the second light detector 124, and the second light detector 124 is configured to obtain a pressure signal applied to the light-transmitting cover 111 by the user according to the light signal.

Optionally, in some embodiments, the material of the cantilever beam 122 may be aluminum alloy or rigid plastic.

Fig. 4 is a schematic side view of a biometric information detection device according to an embodiment of the present application. As shown, the detection device 10 further comprises a support 13. The supporting member 13 is sandwiched between the photoplethysmography detecting module 11 and the photoelectric pressure sensor 12. When the photoplethysmography detection module 11 is used for receiving the pressing of the user, the support 13 and the photoplethysmography detection module 11 are used for pressing the photoelectric pressure sensor 12 together in a linkage manner; the photoelectric pressure sensor 12 is used for detecting the acting force between the photoelectric pressure sensor and the support 13 so as to detect a pressure signal.

Optionally, in some embodiments, the surface area of the upper surface of the support 13 is larger than the surface area of the lower surface of the photoplethysmography detection module 11, and the surface area of the lower surface of the support 13 is comparable to the surface area of the upper surface of the cantilever beam 122 of the photoelectric pressure sensor 12. By adopting the scheme of the embodiment, on one hand, the mechanical strength of the detection device provided by the embodiment of the application can be increased, and on the other hand, the force can be more uniformly transmitted to the photoelectric pressure sensor 12 from the photoplethysmography detection module 11, so that the detection accuracy is improved. In addition, in the case where the supporting member 13 is provided, the volume of the photoplethysmography detecting module 11 can be made thin and light according to the needs of the keys of the electronic device.

With continued reference to fig. 4, as shown, the line connecting the center of the lower surface of the photoplethysmography detection module 11 and the center of the free end 126 of the cantilever beam 122 is perpendicular to the horizontal plane. By adopting the scheme of the embodiment, when the user presses the photoelectric volume pulse wave tracing detection module 11, the force can be more uniformly transmitted from the photoelectric volume pulse wave tracing detection module 11 to the photoelectric pressure sensor 12, and the detection accuracy is further improved.

Fig. 5 is a schematic diagram of a structure of the electro-optical pressure sensor of fig. 3 without the cantilever beam. Referring to fig. 5 and 3, as shown, the light emitting center of the second light source 123 and the light sensing center of the second light detector 124 are disposed opposite to each other. Specifically, the light emission center refers to a portion of the second light source 123 having the highest luminance, and the light sensing center refers to a portion of the second light detector 124 having the highest light receiving efficiency. The second Light source 123 may be a Light Emitting element such as a Light Emitting Diode (LED), an organic Light Emitting Diode, or a phosphor. The second photodetector 124 may be a photoelectric conversion element such as a Photodiode (PD), a silicon-based photodiode, a phototransistor, an avalanche photodiode, or a photomultiplier.

In some embodiments, the wavelength of the light emitted by the second light source 123 may be 400nm to 1000 nm.

In some embodiments, the AA Area (Active Area) of the second light detector 124 is larger than the air gap between the cantilever 122 and the base 121. By adopting the scheme of the embodiment, the installation is convenient, and the biological characteristic information is convenient to detect.

The second light source 123 may be pulsed to emit light, and the pulse output frequency is adjusted according to the pressure variation speed applied by the user on the photoplethysmography detection module 11, so as to reduce power consumption and improve anti-interference capability.

In some embodiments, the second optical source 123 emits the optical signal in the target wavelength band using a dedicated conditioning circuit, and the second optical detector 124 receives the optical signal in the target wavelength band using a transimpedance amplifier.

In the process of detecting the biometric information, the second light source 123 and the second light detector 124 form a light-passing path, the light-passing path is a light path formed by emitting an optical signal of a target wavelength band from a light-emitting center of the second light source 123 to a light-sensing center of the second light detector 124, a free end 126 of the cantilever beam 122 is directly above the second light source 123 and the second light detector 124, the free end 126 of the cantilever beam 122 generates a displacement motion under the action of a force of the cantilever beam 122, the displacement motion can block the light-passing path, and the optical signal received by the second light detector 124 can change along with the change of the pressure applied to the photoplethysmography detection module 11 by a user.

Optionally, in some embodiments, the second light source 123 and the second light detector 124 are oppositely disposed in the width direction of the base 121.

Preferably, a first groove 128 is provided in a width direction along the susceptor 121, and the second light source 123 and the second light detector 124 are oppositely provided at both ends of the first groove 128, respectively.

Referring to fig. 4, optionally, in some embodiments, the free end 126 of the cantilever beam 122 is provided with a light blocking valve 127, and the light blocking valve 127 is formed by extending the free end 126 downward, that is, the light blocking valve 127 is integrally formed with the cantilever beam 122 to block the light path between the second light source 123 and the second light detector 124.

Optionally, in some embodiments, the free end 126 of the cantilever beam 122 is provided with a light blocking valve 127, and the light blocking valve 127 is fixed to the free end 126 and perpendicular to the cantilever beam 122 to block the light path between the second light source 123 and the second light detector 124. Illustratively, in this embodiment, the light blocking valve 127 is a thin piece fixed to the free end 126 and perpendicular to the cantilever beam 122.

Compared with the case that the light blocking valve 127 is not arranged, the arrangement of the light blocking valve 127 can further improve the blocking effect of the free end 126 of the cantilever beam 122 on the light path between the second light source 123 and the second light detector 124, so as to improve the sensitivity and accuracy of the biometric information detection result.

It should be understood that, in the case of disposing the light blocking valve 127, the base 121 may be correspondingly disposed with a groove 128, so as to ensure that the volume of the photoelectric pressure sensor 12 is not increased due to the disposition of the light blocking valve 127, and meet the requirement of miniaturization of the detection apparatus 10.

Preferably, the maximum displacement of the free end 126 of the cantilever beam 122 is less than or equal to 3 mm.

With the solution of this embodiment, first, the maximum displacement of the free end 126 of the cantilever beam 122 just fills the air gap between the base 121 and the underside of the cantilever beam 122; secondly, this allows the detection device 10 to be thinner, suitable for integration on an electronic apparatus; finally, the maximum displacement is less than or equal to 3mm, so that the optical signal received by the second optical detector 124 and the pressure applied by the user on the photoplethysmography detection module 11 form a linear function relationship, the difficulty of signal resolving can be reduced, the power consumption of the system is reduced, and the detection accuracy is improved.

Fig. 6 is another structural schematic diagram of the photoelectric pressure sensor according to the embodiment of the present application. As shown, the upper surface of the base is provided with: a first groove 128, the first groove 128 being disposed below the free end 126 of the cantilever beam 122 along the width direction of the base 121; the second groove 129 and the third groove 130 are oppositely disposed along the length direction of the base 121, the second groove 129 is on the left side of the free end 126, the third groove 130 is on the right side of the free end 126, the second light source 123 is disposed in the second groove 129, and the second light detector 124 is disposed in the third groove 130. In the detection process of the biometric information, a light passing path is formed between the second light source 123 and the second light detector 124, the cantilever beam 122 is displaced downwards under the action of force, the light blocking valve 127 blocks the light passing path, the light signal received by the second light detector 124 is changed, an electric signal which is changed along with the light signal is generated, and the pressure is calculated through the signal processor. The signal processor may be a Microcontroller Unit (MCU) or the like.

Fig. 7 is another structural schematic diagram of the photoelectric pressure sensor according to the embodiment of the present application. As shown, the second recess 129 is disposed to the left of the free end 126, the second light source 123 is disposed in the second recess 129, and the second light detector 124 is disposed to the left of the fixed end 125 next to the fixed end 125. In the detection process of the biometric information, the second light source 123 emits an optical signal of a target waveband, the optical signal is transmitted to the second light detector 124 through an air gap between the cantilever 122 and the base 121, that is, a light passing path is formed between the second light source 123 and the second light detector 124, the cantilever 122 is displaced downwards under the action of force, the light blocking valve 127 blocks the light passing path, the optical signal received by the second light detector 124 changes, an electrical signal which changes along with the optical signal is generated, and the signal processor calculates the pressure. The signal processor may be a Microcontroller Unit (MCU) or the like.

Fig. 8 is another structural schematic diagram of the photoelectric pressure sensor according to the embodiment of the present application. As shown, the second recess 129 is disposed to the left of the free end 126, the second light source 123 is disposed in the second recess 129, and the second light detector 124 is disposed to the right of the fixed end 125 next to the fixed end 125. The fixed end 125 is provided with a through hole 131 to transmit an optical signal emitted from the second light source 123. In the process of detecting the biometric information, the second light source 123 emits an optical signal of a target wavelength band, the optical signal is transmitted to the second photodetector 124 through an air gap between the cantilever 122 and the base 121 and the through hole 131, that is, a light transmission path is formed between the second light source 123 and the second photodetector 124, the cantilever 122 is displaced downward under the action of a force, the light blocking valve 127 blocks the light transmission path, the optical signal received by the second photodetector 124 is changed, an electrical signal which is changed along with the optical signal is generated, and the pressure is calculated by the signal processor. The signal processor may be a Microcontroller Unit (MCU) or the like.

Fig. 9 is another schematic structural diagram of the photoelectric pressure sensor according to the embodiment of the present application. FIG. 10 is another structural schematic diagram of the electro-optic pressure sensor of FIG. 9 without the cantilevered beam. With reference to fig. 9 and 10, a first groove 128 is disposed along the width direction of the base 121, and the second light source 123 and the second light detector 124 are disposed on the surface of the first groove 128 and below the free end 126 of the cantilever 122 in a surface mount package manner. The light emitting center of the second light source 123 and the light sensing center of the second light detector 124 face the lower surface of the free end 126.

Specifically, the optical signal emitted from the second light source 123 is reflected by the lower surface of the suspended end 126 to form a reflected optical signal, and the second optical detector 124 receives the reflected optical signal. The optical signal from the second light source 123 to the lower surface of the free end 126 is reflected and received by the second optical detector 124, and the optical path formed in the process is a reflected optical path. In the process of detecting the biometric information, the pressure received by the photoplethysmography detecting module 11 gradually increases, the pressure is transmitted to the cantilever 122 of the photoelectric pressure sensor 12, the displacement of the free end 126 of the cantilever 122 gradually increases, so that the reflected light path changes, and the optical signal received by the second optical detector 124 is in a functional relationship with the pressure. The photoelectric signal received by the second photodetector 124 is processed by the signal processor to calculate the pressure. The signal processor may be a Microcontroller Unit (MCU) or the like.

Alternatively, the first groove 128 may not be provided on the susceptor 121, the second light source 123 and the second light detector 124 may be provided on the upper surface of the susceptor 121 along the width direction of the susceptor 121, and the second light source 123 and the second light detector 124 may be provided below the free end 126. The light emitting center of the second light source 123 and the light sensing center of the second light detector 124 face the lower surface of the free end 126. At this time, the free end 126 of cantilever beam 122 is not provided with shutter 127.

Fig. 11 is a schematic top view of an electronic device according to an embodiment of the present application, i.e., a front surface of the electronic device. As an example, the electronic device shown in fig. 11 is a mobile phone, the side of which is provided with a key 1, the light-transmitting cover 111 of the photoplethysmography detection module 11 is multiplexed as a part of the housing of the key 1 for receiving the pressing of the user, and the first light source 112 and the first light detector 113 are disposed in a cavity provided in the housing of the key 1. The photoelectric pressure sensor 12 and the photoplethysmography detection module 11 are stacked and located inside the electronic device.

Specifically, the embodiment of the present application further provides an electronic device, and the electronic device may include the detection apparatus for biometric information in any of the embodiments of the present application. The application provides a detection device sets up in electronic equipment through button 1 for the user can be through the portable electronic equipment can be anytime and anywhere convenient realization biological characteristic information's that the portable just detection accuracy is high.

Optionally, the key 1 in the embodiment of the present application may also be disposed on the front surface or the bottom surface of the mobile phone, which is not specifically limited in the embodiment of the present application.

Optionally, the key 1 may be reused as a power key or a volume key of the electronic device, which is not limited in this embodiment.

In some embodiments, the housing 115 and the substrate 114 of the photoplethysmography detection module 11 are multiplexed as a housing of the key 1, so that compared with the case of multiplexing only a light-transmitting cover plate, on one hand, the manufacturing cost of the key 1 and the photoplethysmography detection module 11 can be further reduced, thereby reducing the manufacturing cost of the electronic device, and on the other hand, the volume of the key 1 can be reduced, thereby meeting the requirement of miniaturization.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (25)

1. The utility model provides a detection apparatus for biological characteristic information, is applied to electronic equipment, its characterized in that, electronic equipment includes the button, be provided with the cavity in the casing of button, detection apparatus includes:

a photoplethysmography detection module, the photoplethysmography detection module comprising: the light-transmitting cover plate is reused as a partial shell of the key and used for receiving the pressing of a user, the first light source and the first light detector are arranged in the cavity, the first light source is used for transmitting an optical signal of a target waveband to a pressing part of the user at the position of the light-transmitting cover plate, and the first light detector is used for receiving the optical signal reflected and/or transmitted by the pressing part to form a first pulse wave signal of the user;

the photoelectric pressure sensor and the photoplethysmography detection module are stacked and arranged and located inside the electronic device, the photoelectric pressure sensor includes a base, a cantilever beam, a second light source and a second light detector, a fixed end of the cantilever beam is fixed on the base, the other end of the cantilever beam is a free end, the photoplethysmography detection module is arranged above the cantilever beam, the second light source and the second light detector are relatively fixed on the base, the free end is used for being displaced when the user presses the light-transmitting cover plate to change a light signal received by the second light detector, the second light detector is used for acquiring a pressure signal applied on the light-transmitting cover plate by the user according to the light signal, and the first pulse wave signal is a corresponding pulse wave signal when the user applies the pressure signal, the pressure signal and the first pulse wave signal are used to detect biometric information of the user.

2. The detection apparatus of claim 1, wherein the photoplethysmography detection module further comprises:

a substrate for supporting the first light source and the first light detector;

the shell is arranged at the peripheral edge of the substrate and used for supporting the light-transmitting cover plate;

the shell and the substrate are reused as a shell of the key, and the light-transmitting cover plate, the shell and the substrate are enclosed to form the cavity in the key.

3. The detection apparatus of claim 2, wherein the photoplethysmography detection module further comprises:

the light blocking piece is clamped in the center of the cavity and divides the cavity into a first sub-cavity and a second sub-cavity, the first light source is arranged in the first sub-cavity, and the first light detector is arranged in the second sub-cavity;

the first transparent piece is filled in the first sub-cavity; and

and the second transparent piece is filled in the second sub-cavity.

4. The detection device according to any one of claims 1 to 3, characterized in that the detection device further comprises:

and the supporting piece is clamped between the photoplethysmography detection module and the photoelectric pressure sensor.

5. A detection apparatus according to claim 4, wherein the surface area of the upper surface of the support is larger than the surface area of the lower surface of the photoplethysmography detection module, which is comparable to the surface area of the upper surface of the cantilever beam of the photoelectric pressure sensor.

6. The detection device according to claim 1, wherein a connection line between a center of a lower surface of the photoplethysmography detection module and a center of the free end of the cantilever beam is perpendicular to a horizontal plane.

7. The detecting device for detecting the rotation of a motor rotor as claimed in claim 1, wherein the first light source comprises a first light emitting element and a second light emitting element, and the first light source can emit light signals of two different target wavelength bands.

8. The detecting device for detecting the rotation of a motor rotor as claimed in claim 7, wherein the optical signals of the two different target wavelength bands are red light and infrared light, respectively.

9. The detecting device according to claim 1, wherein a light emitting center of the second light source is disposed opposite to a light sensing center of the second light detector, and during the detection of the biometric information, the second light source and the second light detector form a light passing path, and a moving path of the free end of the cantilever beam intersects with the light passing path.

10. The detecting device according to claim 9, wherein a first groove is provided on an upper surface of the base, the first groove is provided below the free end of the cantilever beam in a width direction of the base, and the second light source and the second light detector are provided at both ends of the first groove opposite to each other.

11. The detection device according to claim 9, wherein the upper surface of the base is provided with:

a first groove disposed below the free end of the cantilever beam along a width direction of the base;

a second groove and a third groove, the second groove and the third groove being disposed opposite to each other along a length direction of the base, the second groove being located on a left side of the free end, the third groove being located on a right side of the free end, the second light source and the second photodetector being disposed opposite to each other along the length direction of the base, and at least one of the second light source and the second photodetector being disposed in the second groove.

12. The detecting device according to claim 1, wherein the second light source and the second photodetector are fixed on an upper surface of the base along a width direction of the base and disposed below the free end of the cantilever beam, and a light emitting center of the second light source and a light sensing center of the second photodetector face a lower surface of the free end.

13. The detecting device according to claim 12, wherein the base is provided with a first groove along a width direction, the second light source and the second light detector are provided on a surface of the first groove, and a light emitting center of the second light source and a light sensing center of the second light detector face a lower surface of the free end.

14. The detection device of claim 1, wherein a maximum displacement of the free end of the cantilever beam is less than or equal to 3 mm.

15. The detecting device for detecting the rotation of a motor rotor as claimed in claim 9, wherein the free end of the cantilever beam is provided with a light blocking valve for blocking the light passing path.

16. The detecting device for detecting the rotation of a motor rotor as claimed in claim 15, wherein the light blocking valve is formed by extending the free end downwards.

17. The detecting device for detecting the rotation of a motor rotor as claimed in claim 15, wherein the light blocking valve is fixedly arranged at the free end and is perpendicular to the cantilever beam.

18. The detection device of claim 1, wherein the second light source is pulsed.

19. The detecting device for detecting the rotation of a motor rotor according to the claims 1-3 and 5-18, wherein the material of the light-transmitting cover plate is plastic or glass covered with a light homogenizing film, and the light-transmitting cover plate only allows the light signals of a target waveband to pass through.

20. The device as claimed in any one of claims 1-3 and 5-18, wherein the photoplethysmography detection module is in the shape of a narrow strip.

21. The detecting device for detecting the rotation of a motor rotor as claimed in any one of claims 1-3 and 5-18, wherein the key is arranged on the side or the back of the electronic equipment.

22. The detecting device for detecting the rotation of a motor rotor according to any one of claims 1-3 and 5-18, wherein the keys are multiplexed into function keys of the electronic equipment.

23. The detecting device for detecting the rotation of a motor rotor as claimed in claim 22, wherein the keys are multiplexed as a power key or a volume key on the side of the electronic equipment.

24. An electronic device, comprising: the test device of any of claims 1-3, 5-18, or 23.

25. The electronic device of claim 24, wherein the electronic device is a wearable device or a cell phone.

Images