Fingerprint button, electronic device and fingerprint unlocking method

Abstract

The present application provides a fingerprint button, an electronic device and a fingerprint unlocking method, which relate to the field of electronic technology. The fingerprint button comprises: a shell, a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate, and a capping film are sequentially stacked in the interior of the accommodating space toward the opening direction; a Bragg grating is arranged in each optical fiber monomer of the optical fiber array plate; the light emitting device emits the emitted light into the optical circulator; the light incident from the optical circulator is emitted from the second port to form a first light signal and is emitted into the optical fiber array plate, the optical fiber array plate reflects the first light signal to form a second light signal, when the finger presses on the capping film, the Bragg grating length on the optical fiber monomer changes differently, the second light signal forms a light signal corresponding to the fingerprint of the pressed finger, and the photoelectric sensor converts the second light signal to generate an unlocking input signal corresponding to the fingerprint of the pressed finger. It solves the technical problem that the current fingerprint button cannot be unlocked with wet hands.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a fingerprint button, an electronic device and a fingerprint unlocking method. Background Art

[0002] Fingerprint recognition unlocking is a password unlocking operation that uses the user's fingerprint as a password. Due to the lifelong immutability, uniqueness and convenience of fingerprints, fingerprint recognition unlocking has been widely used in various electronic devices.

[0003] However, in the prior art, the fingerprint recognition unlocking principle of mobile phones using fingerprint buttons is a capacitive fingerprint sensor based on the Hall principle. Although the capacitive fingerprint sensor has the advantages of fast unlocking, high accuracy and compact size, it is easily affected by the environment. For example, after washing hands, when the user unlocks with wet fingers, the water vapor will affect the capacitance value of the sensor, resulting in failure to unlock, which brings a bad user experience.

[0004] Therefore, the above technical problems need to be further resolved. Summary of the invention

[0005] The main purpose of the present invention is to provide a fingerprint button, an electronic device and a fingerprint unlocking method, so as to solve the technical problem that the current fingerprint button cannot be unlocked with wet hands.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] On the one hand, the present application provides a fingerprint button, comprising: a shell, the shell is provided with an opening connected to an internal accommodating space, and the interior of the accommodating space is provided with a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate, and a cover film stacked in sequence toward the opening;

[0008] A first port is arranged on a side of the optical circulator, a second port is arranged on a side facing the second concave lens, and a third port is arranged on a side facing the first concave lens;

[0009] A Bragg grating is provided in each optical fiber monomer of the optical fiber array plate;

[0010] The covering film covers the optical fiber array plate and the opening at the same time;

[0011] A light emitting device, the light emitting device is arranged in the housing and is used to emit light into the optical circulator through a first port;

[0012] Among them, the optical circulator can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array board, the optical fiber array board reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator and is emitted from the third port to the photoelectric converter, when the finger presses on the covering film, the Bragg grating lengths on the multiple optical fiber monomers of the optical fiber array board are pressed and change differently, the second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger, and the photoelectric sensor generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal.

[0013] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0014] Optionally, in the aforementioned fingerprint button, the optical fiber array plate comprises a transparent substrate and a plurality of optical fiber monomers, the plurality of optical fiber monomers are formed on the transparent substrate in an array arrangement, and each of the optical fiber monomers extends along the second concave lens toward the covering film;

[0015] The Bragg grating is arranged at one end of the optical fiber monomer close to the transparent substrate, and a reflective layer is arranged at the end of the optical fiber monomer away from the transparent substrate.

[0016] Optionally, in the aforementioned fingerprint button, the optical fiber monomer comprises a core and a cladding layer, the core diameter is 8um-10um, and the distance between two adjacent optical fiber monomers is 40um-50um.

[0017] Optionally, in the aforementioned fingerprint button, the core diameter of the optical fiber monomer is 8 um, and the distance between two adjacent optical fiber monomers is 50 um.

[0018] Optionally, in the aforementioned fingerprint button, one end of the optical fiber monomer of the optical fiber array plate provided with a reflective layer is flush with the opening of the housing.

[0019] Optionally, in the aforementioned fingerprint button, the area covered by the first light signal transmitted by the second concave lens toward the optical fiber array plate is larger than the functional area of ​​the optical fiber array plate;

[0020] The functional area of ​​the optical fiber array plate is an area where a plurality of optical fiber monomers are arranged.

[0021] Optionally, in the aforementioned fingerprint button, the covering film is a polyester resin film.

[0022] Optionally, in the aforementioned fingerprint button, the shell is in a groove shape as a whole, the groove is the opening, the accommodating space is a step-shaped groove, and the accommodating space includes a first step groove, a second step groove and a third step groove which gradually increase in size from the groove bottom of the shell toward the opening direction;

[0023] Among them, the photoelectric converter and the first concave lens are arranged in the first step groove, the optical circulator is overlapped on the step between the first step groove and the second step groove, the second concave lens is arranged in the second step groove, and the optical fiber array plate is overlapped on the step between the second step groove and the third step groove.

[0024] Optionally, in the aforementioned fingerprint button, a mounting cavity is provided in a side wall of the housing located on the side of the accommodating space, the mounting cavity is connected to a side of the housing away from the opening and forms a mounting port, the mounting cavity and the side wall of the second step groove form a through hole, and the through hole is directly opposite to the first port of the optical circulator;

[0025] Optionally, in the aforementioned fingerprint button, the light-emitting device is disposed in the mounting cavity, and the light-emitting end of the light-emitting device faces the through hole.

[0026] Optionally, in the aforementioned fingerprint button, a UV-curable adhesive layer is provided on a side of the shell facing away from the opening.

[0027] On the other hand, the present application provides a fingerprint button module, including: a fingerprint button;

[0028] The fingerprint button comprises:

[0029] A housing, wherein the housing is provided with an opening communicating with an internal accommodation space, and a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate, and a cover film are sequentially stacked inside the accommodation space toward the opening;

[0030] A first port is arranged on a side of the optical circulator, a second port is arranged on a side facing the second concave lens, and a third port is arranged on a side facing the first concave lens;

[0031] A Bragg grating is provided in each optical fiber monomer of the optical fiber array plate;

[0032] The covering film covers the optical fiber array plate and the opening at the same time;

[0033] A light emitting device, the light emitting device is arranged in the housing and is used to emit light into the optical circulator through a first port;

[0034] Wherein, the optical circulator can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array board, the optical fiber array board reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator and is emitted from the third port to the photoelectric converter, when the finger presses on the cover film, the Bragg grating lengths on the pressed optical fiber monomers of the optical fiber array board change differently, the second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger, and the photoelectric sensor generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal;

[0035] A flexible circuit board, one connection end of which is arranged at a position of the housing of the fingerprint button away from the outlet, and is connected to the photoelectric converter, the optical circulator and the light-emitting device in the fingerprint button.

[0036] On the other hand, the present application provides an electronic device, including: a fingerprint button module;

[0037] The fingerprint button module includes: a fingerprint button;

[0038] The fingerprint button comprises:

[0039] A housing, wherein the housing is provided with an opening communicating with an internal accommodation space, and a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate, and a cover film are sequentially stacked inside the accommodation space toward the opening;

[0040] A first port is arranged on a side of the optical circulator, a second port is arranged on a side facing the second concave lens, and a third port is arranged on a side facing the first concave lens;

[0041] A Bragg grating is provided in each optical fiber monomer of the optical fiber array plate;

[0042] The covering film covers the optical fiber array plate and the opening at the same time;

[0043] A light emitting device, the light emitting device is arranged in the housing and is used to emit light into the optical circulator through a first port;

[0044] Wherein, the optical circulator can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array board, the optical fiber array board reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator and is emitted from the third port to the photoelectric converter, when the finger presses on the cover film, the Bragg grating lengths on the pressed optical fiber monomers of the optical fiber array board change differently, the second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger, and the photoelectric sensor generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal;

[0045] A flexible circuit board, one connection end of which is arranged at a position of the housing of the fingerprint button away from the outlet, and is connected to the photoelectric converter, the optical circulator and the light-emitting device in the fingerprint button.

[0046] On the other hand, the present application provides a fingerprint unlocking method, comprising:

[0047] Pre-store the user's fingerprint spectrum information as the unlocking password;

[0048] Obtain the optical signal corresponding to the user's fingerprint and convert it into an unlock input signal;

[0049] The unlock input signal is compared with the pre-stored fingerprint spectrum information. If the similarity rate exceeds a preset threshold, the input fingerprint password is correct and unlocking is initiated.

[0050] By means of the above technical solution, the fingerprint button, electronic device and fingerprint unlocking method of the present invention have at least the following advantages:

[0051] The fingerprint key provided by the embodiment of the present invention is provided with a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate and a light emitting device. The light emitted by the light emitting device can be injected into the optical fiber array plate as a first light signal through the optical circulator, and each optical fiber monomer in the optical fiber array plate is provided with a Bragg grating, so that the first light signal can be reflected to form a second light signal, and the second light signal can be projected on the photoelectric converter through the optical circulator. When the user's finger exerts pressure on the optical fiber array plate by pressing the cover film, since the fingerprint of the finger has raised lines and sunken lines, the pressure acting on multiple optical fiber monomers will be different, that is, the Bragg gratings in the multiple optical fiber monomers are compressed by different length changes, and then the wavelength of the light reflected by the Bragg gratings of different optical fiber monomers changes, forming a second light signal corresponding to the fingerprint of the user's finger. At this time, the photoelectric sensor can convert and generate an unlock input signal corresponding to the fingerprint of the pressed finger based on the second light signal. When the unlock input signal and the pre-stored user's fingerprint spectrum information are identical at a rate exceeding a preset threshold, the correct unlock password is entered, and the unlocking action can be executed. It can be seen that the fingerprint button provided in the embodiment of the present invention does not need to worry about the user's fingers getting wet, because the fingerprint button provided in the embodiment of the present invention forms an optical signal corresponding to the user's fingerprint through the change of the Bragg grating length in different optical fiber monomers, and then serves as the optical signal for unlocking. It is not a capacitive sensor, which solves the technical problem that the current fingerprint button cannot be unlocked with wet hands.

[0052] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0054] Figure 1 The exploded structure diagram of a fingerprint button is schematically shown;

[0055] Figure 2 A schematic cross-sectional view of a fingerprint button is shown schematically;

[0056] Figure 3 A stereogram of a fingerprint button is schematically shown;

[0057] Figure 4 A schematic diagram of the optical signal transmission path in a fingerprint key is schematically shown;

[0058] Figure 5 The structure diagram of an optical fiber monomer of an optical fiber array board of a fingerprint button is schematically shown;

[0059] Figure 6 The structure diagram of a fingerprint key module is schematically shown;

[0060] Figure 7 The flowchart of the fingerprint unlocking method is schematically shown.

[0061] Figure 1-Figure 6 The labels are:

[0062] Fingerprint button 100, shell 1, accommodating space 11, opening 12, first step groove 13, second step groove 14, third step groove 15, mounting cavity 16, through hole 161, photoelectric converter 2, first concave lens 3, optical circulator 4, second concave lens 5, optical fiber array plate 6, optical fiber monomer 61, transparent substrate 62, Bragg grating 611, reflective layer 612, covering film 7, light-emitting device 8, ultraviolet curing adhesive layer 9, flexible circuit board 10. DETAILED DESCRIPTION

[0063] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0064] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0065] Embodiment 1

[0066] like Figure 1-Figure 3 As shown, a fingerprint button 100 proposed in the first embodiment of the present invention comprises: a housing 1, the housing 1 is provided with an opening 12 connected to an internal accommodation space 11, and a photoelectric converter 2, a first concave lens 3, an optical circulator 4, a second concave lens 5, an optical fiber array plate 6, and a cover film 7 are sequentially stacked inside the accommodation space 11 toward the opening 12;

[0067] A first port is arranged on the side of the optical circulator 4, a second port is arranged on the side facing the second concave lens 5, and a third port is arranged on the side facing the first concave lens 3;

[0068] Each optical fiber monomer 61 of the optical fiber array plate 6 is provided with a Bragg grating 611;

[0069] The covering film 7 covers the optical fiber array plate 6 and the opening 12 at the same time;

[0070] a light emitting device 8, the light emitting device 8 being arranged in the housing 1 and used for emitting light into the optical circulator 4 through a first port;

[0071] Among them, the optical circulator 4 can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array plate 6, the optical fiber array plate 6 reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator 4 and is emitted from the third port to the photoelectric converter 2. When the finger presses the covering film 7, the lengths of the Bragg gratings 611 on the multiple optical fiber monomers 61 of the optical fiber array plate 6 are compressed and change differently. The second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger. The photoelectric sensor generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal. The specific optical path is as follows Figure 4 shown.

[0072] Specifically, the housing 1 can be a plastic part. The housing 1 is the main body of the fingerprint button 100. Its shape can be set to a circular, elliptical, oblong, rectangular or other shapes according to the design requirements of the electronic device. The embodiment of the present invention does not limit it. The opening 12 set on the housing 1 can occupy the entire surface of one side of the housing 1, or a partial area of ​​the side surface of the side. The accommodating space 11 of the housing 1 is based on being able to accommodate the devices such as the photoelectric converter 2, the first concave lens 3, the optical circulator 4, the second concave lens 5, and the optical fiber array board 6.

[0073] The photoelectric converter 2 may be a charge coupled device (CCD) capable of converting a received optical signal into an electrical signal. In the embodiment of the present invention, the photoelectric converter 2 is used to convert the second optical signal into an unlock input signal for opening the electronic device. It should be noted that the receiving end of the photoelectric converter 2 needs to face the third port of the optical circulator 4 and the first concave lens 3 to ensure that the second optical signal emitted from the third port of the optical circulator 4 can be projected onto the receiving end of the photoelectric converter 2. The photoelectric converter 2 can be connected to a printed circuit board or a flexible circuit board 10 to transmit the electrical signal obtained by converting the second optical signal.

[0074] The first concave lens 3 is used to transmit the second optical signal in the form of parallel light emitted from the third port of the optical circulator 4, and radiate the second optical signal in the form of parallel light onto the photoelectric converter 2, that is, the first concave lens 3 plays a role in increasing the coverage area of ​​the second optical signal, ensuring that the photoelectric converter 2 can receive the second optical signal.

[0075] The optical circulator 4 is a multi-port optical device with non-reciprocal characteristics. When an optical signal is input from any port, it can be output from the next port with very little loss according to the designed path. The embodiment of the present invention uses an optical circulator 4 with three ports to achieve the above-mentioned effect that the incident light enters from the first port and is emitted from the second port to form the first optical signal, and the effect that the second optical signal injected from the second port can be emitted from the third port. The optical circulator 4 can be purchased on the market, and the embodiment of the present invention will not be described in detail.

[0076] The second concave lens 5 is used to transmit the first optical signal in the form of parallel light emitted from the second port of the optical circulator 4, and radiate the first optical signal in the form of parallel light onto the optical fiber array plate 6, that is, the second concave lens 5 serves to increase the coverage area of ​​the first optical signal, ensuring that the first optical signal can cover the functional area of ​​the optical fiber array plate 6.

[0077] The optical fiber array plate 6 is composed of optical fiber monomers 61 arranged in an array. A Bragg grating 611 is also provided in each optical fiber monomer 61. Since the Bragg grating 611 is also called a short-period optical fiber grating, its main feature is that it can reflect a part of the optical signal with a specific wavelength in the optical signal back to the incident end. The reflected light wavelength λ and the grating length Λ satisfy the following relationship:

[0078]

[0079] Among them, λ is the reflected wavelength, n is the refractive index, θ is the propagation angle in the medium relative to normal incidence, and Λ is the grating length. That is, if the external pressure causes the grating length Λ to change, it will cause the reflected light wavelength to change.

[0080] Therefore, the optical fiber array plate 6 can receive the first optical signal and reflect the first optical signal to form a second optical signal. When a finger with concave and convex patterns presses the optical fiber array plate 6, the length of the Bragg grating 611 in the multiple optical fiber monomers 61 changes accordingly. After receiving the first optical signal, it can reflect to form a second optical signal corresponding to the fingerprint characteristics of the pressing finger, which can then be converted by the photoelectric converter 2 into an unlocking input signal for unlocking.

[0081] The fingerprint button 100 provided in the embodiment of the present invention is provided with a photoelectric converter 2, a first concave lens 3, an optical circulator 4, a second concave lens 5, a fiber array plate 6 and a light emitting device 8. The light emitted by the light emitting device 8 can be emitted into the fiber array plate 6 as a first light signal through the optical circulator 4, and each optical fiber monomer 61 in the optical fiber array plate 6 is provided with a Bragg grating 611, so that the first light signal can be reflected to form a second light signal, and the second light signal can be emitted onto the photoelectric converter 2 through the optical circulator 4. When the user's finger applies pressure to the fiber array plate 6 by pressing the cover film 7, since the fingerprint of the finger has raised lines and sunken lines, the pressure acting on the multiple optical fiber monomers 61 will be different, that is, the Bragg gratings 611 in the multiple optical fiber monomers 61 are pressed longer. The amount of change in degree is different, and then the wavelength of the light reflected by the Bragg grating 611 of different optical fiber monomers 61 changes, forming a second optical signal corresponding to the user's finger fingerprint. At this time, the photoelectric sensor can convert the second optical signal to generate an unlock input signal corresponding to the pressed finger fingerprint. When the unlock input signal and the pre-stored user's fingerprint spectrum information are identical at a rate exceeding a preset threshold, the correct unlock password is entered, and the unlocking action can be executed. It should be explained that the threshold set during the above comparison is set according to the fingerprint unlocking algorithm in the prior art. The specific algorithm is known to the technicians and will not be described in detail in the present invention. It can be seen that the fingerprint button 100 provided in the embodiment of the present invention does not need to worry about the user's finger getting wet, because the fingerprint button 100 provided in the embodiment of the present invention forms an optical signal corresponding to the user's fingerprint through the change in the length of the Bragg grating 611 in different optical fiber monomers 61, and then serves as an unlocking optical signal. It is not a capacitive sensor, which solves the technical problem that the current fingerprint button 100 cannot be unlocked with wet hands.

[0082] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in a specific implementation, the optical fiber array plate 6 includes a transparent substrate 62 and a plurality of optical fiber monomers 61, and the plurality of optical fiber monomers 61 are formed on the transparent substrate 62 in an array arrangement manner, and each of the optical fiber monomers 61 extends along the second concave lens 5 toward the cover film 7;

[0083] The Bragg grating 611 is arranged at one end of the optical fiber monomer 61 close to the transparent substrate 62 , and a reflective layer 612 is arranged at the end of the optical fiber monomer 61 away from the transparent substrate 62 .

[0084] Specifically, the molding methods of the optical fiber monomer 61 and the optical fiber array plate 6 are known to those skilled in the art, and will not be described in detail in the embodiments of the present invention. Since the distance between two adjacent protruding lines of the fingerprint is about 100um-400um, the optical fiber monomer 61 may include a core and a cladding layer, the core diameter may be 8um-10um, preferably 8um, the thickness of the cladding layer may be 50um, and the distance between two adjacent optical fiber monomers 61 is 40um-50um, preferably 50um. The material of the reflective layer 612 may be HfO2 or SiO2, but is not limited to these two materials.

[0085] like Figure 5 As shown, in a specific implementation, one end of the optical fiber monomer 61 of the optical fiber array plate 6 provided with the reflective layer 612 is flush with the opening 12 of the housing 1 .

[0086] Specifically, one end of the optical fiber monomer 61 with a reflective layer 612 is flush with the opening 12 of the shell 1. When the user presses, that is, when performing fingerprint recognition, he can press directly on a plane to avoid the discomfort of the pressing operation caused by the raised edge of the opening 12 and avoid affecting the pressing action that affects the touch.

[0087] In a specific implementation, the area covered by the first light signal transmitted by the second concave lens 5 toward the optical fiber array plate 6 is larger than the functional area of ​​the optical fiber array plate 6; wherein the functional area of ​​the optical fiber array plate 6 is the area where a plurality of the optical fiber monomers 61 are arranged.

[0088] Specifically, the first concave lens 3 and the second concave lens 5 may be of the same specifications.

[0089] In a specific implementation, the sealing film 7 is a polyester resin film, and its thickness can be designed according to the use requirements. The sealing film 7 preferably also covers the edge of the opening 12, so that the touch pressing surface of the fingerprint button 100 formed in this way has better sealing and higher firmness.

[0090] like Figure 1 and Figure 2 As shown, in a specific implementation, the housing 1 is in a groove shape as a whole, the groove is the opening 12, the accommodation space 11 is a step-shaped groove, and the accommodation space 11 includes a first step groove 13, a second step groove 14 and a third step groove 15 which gradually increase in size from the groove bottom of the housing 1 to the opening 12;

[0091] Among them, the photoelectric converter 2 and the first concave lens 3 are arranged in the first step groove 13, the optical circulator 4 is overlapped on the step between the first step groove 13 and the second step groove 14, the second concave lens 5 is arranged in the second step groove 14, and the optical fiber array plate 6 is overlapped on the step between the second step groove 14 and the third step groove 15.

[0092] Specifically, the inner wall of the groove of the housing 1 forms two annular steps, and then forms a three-step groove, so that the step position can be used as a platform for overlapping and installing parts. The edge of the optical circulator 4 overlaps the step between the first step groove 13 and the second step groove 14, and can be fixed by gluing, for example, by using hot melt glue to fix. Similarly, the edge of the substrate of the optical fiber array plate 6 overlaps the step between the second step groove 14 and the third step groove 15, and can be fixed by gluing, for example, by using hot melt glue to fix.

[0093] Furthermore, a mounting cavity 16 is provided in the side wall of the shell 1 located on the side of the accommodating space 11, and the mounting cavity 16 is connected to the side of the shell 1 away from the opening 12 to form a mounting port, and the mounting cavity 16 and the side wall of the second step groove 14 form a through hole 161, and the through hole 161 is opposite to the first port of the optical circulator 4; wherein the light-emitting device 8 is arranged in the mounting cavity 16, and the light-emitting end of the light-emitting device 8 is opposite to the through hole 161.

[0094] Specifically, a protrusion for engaging the light emitting device 8 may be provided in the installation cavity 16, or the size of the installation cavity 16 may be set to have an interference fit with the outer dimensions of the light emitting device 8 to ensure stability after installation. The light emitting device 8 may be an LED lamp.

[0095] Furthermore, a wire hole can be provided on the side of the housing 1 facing away from the opening 12 for the connection wires of the photoelectric converter 2 and the optical circulator 4 to extend out. A UV curable adhesive layer 9 is provided on the side of the housing 1 facing away from the opening 12 to seal all the pores on this side of the housing 1 to prevent the entry of water vapor and dust.

[0096] Embodiment 2

[0097] like Figure 6 As shown, a fingerprint button 100 module proposed in the second embodiment of the present invention includes: a fingerprint button 100; the fingerprint button 100 includes:

[0098] A housing 1, wherein the housing 1 is provided with an opening 12 communicating with an internal accommodation space 11, and a photoelectric converter 2, a first concave lens 3, an optical circulator 4, a second concave lens 5, an optical fiber array plate 6, and a cover film 7 are sequentially stacked inside the accommodation space 11 toward the opening 12;

[0099] A first port is arranged on the side of the optical circulator 4, a second port is arranged on the side facing the second concave lens 5, and a third port is arranged on the side facing the first concave lens 3;

[0100] Each optical fiber monomer 61 of the optical fiber array plate 6 is provided with a Bragg grating 611;

[0101] The covering film 7 covers the optical fiber array plate 6 and the opening 12 at the same time;

[0102] a light emitting device 8, the light emitting device 8 being arranged in the housing 1 and used for emitting light into the optical circulator 4 through a first port;

[0103] Wherein, the optical circulator 4 can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array plate 6, the optical fiber array plate 6 reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator 4 and is emitted from the third port to the photoelectric converter 2, when the finger presses on the cover film 7, the lengths of the Bragg gratings 611 on the multiple optical fiber monomers 61 of the optical fiber array plate 6 are compressed and change differently, the second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger, and the photoelectric sensor generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal;

[0104] A flexible circuit board 10 has a connection end disposed on a side of the housing 1 of the fingerprint button 100 away from the opening 12 , and is connected to the photoelectric converter 2 , the optical circulator 4 and the light emitting device 8 in the fingerprint button 100 .

[0105] Specifically, the fingerprint button 100 described in the second embodiment can directly use the fingerprint button 100 provided in the first embodiment. The specific implementation structure can refer to the relevant content described in the first embodiment, which will not be repeated here.

[0106] The fingerprint button 100 module provided in the embodiment of the present invention is provided with a photoelectric converter 2, a first concave lens 3, an optical circulator 4, a second concave lens 5, a fiber array plate 6 and a light emitting device 8. The light emitted by the light emitting device 8 can be emitted into the fiber array plate 6 as a first light signal through the optical circulator 4, and each optical fiber monomer 61 in the optical fiber array plate 6 is provided with a Bragg grating 611, so that the first light signal can be reflected to form a second light signal, and the second light signal can be emitted onto the photoelectric converter 2 through the optical circulator 4. When the user's finger applies pressure to the fiber array plate 6 by pressing the cover film 7, since the fingerprint of the finger has raised lines and recessed lines, the pressure acting on the multiple optical fiber monomers 61 will be different, that is, the Bragg gratings 611 in the multiple optical fiber monomers 61 are pressed longer. The amount of change in degree is different, and then the wavelength of the light reflected by the Bragg grating 611 of different optical fiber monomers 61 changes, forming a second optical signal corresponding to the user's finger fingerprint. At this time, the photoelectric sensor can convert the second optical signal to generate an unlock input signal corresponding to the pressed finger fingerprint. When the unlock input signal and the pre-stored user's fingerprint spectrum information are identical at a rate exceeding a preset threshold, the correct unlock password is entered, and the unlocking action can be executed. It should be explained that the threshold set during the above comparison is set according to the fingerprint unlocking algorithm in the prior art. The specific algorithm is known to the technicians and will not be described in detail in the present invention. It can be seen that the fingerprint button 100 provided in the embodiment of the present invention does not need to worry about the user's finger getting wet, because the fingerprint button 100 provided in the embodiment of the present invention forms an optical signal corresponding to the user's fingerprint through the change in the length of the Bragg grating 611 in different optical fiber monomers 61, and then serves as an unlocking optical signal. It is not a capacitive sensor, which solves the technical problem that the current fingerprint button 100 cannot be unlocked with wet hands.

[0107] Embodiment 3

[0108] Embodiment 3 of the present invention provides an electronic device, including: Figure 6 The fingerprint button 100 module shown;

[0109] The fingerprint button 100 module includes: Figure 1-3 The fingerprint button 100 is shown;

[0110] The fingerprint button 100 comprises:

[0111] A housing 1, wherein the housing 1 is provided with an opening 12 communicating with an internal accommodation space 11, and a photoelectric converter 2, a first concave lens 3, an optical circulator 4, a second concave lens 5, an optical fiber array plate 6, and a cover film 7 are sequentially stacked inside the accommodation space 11 toward the opening 12;

[0112] A first port is arranged on the side of the optical circulator 4, a second port is arranged on the side facing the second concave lens 5, and a third port is arranged on the side facing the first concave lens 3;

[0113] Each optical fiber monomer 61 of the optical fiber array plate 6 is provided with a Bragg grating 611;

[0114] The covering film 7 covers the optical fiber array plate 6 and the opening 12 at the same time;

[0115] a light emitting device 8, the light emitting device 8 being arranged in the housing 1 and used for emitting light into the optical circulator 4 through a first port;

[0116] Wherein, the optical circulator 4 can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array plate 6, the optical fiber array plate 6 reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator 4 and is emitted from the third port to the photoelectric converter 2, when the finger presses on the cover film 7, the lengths of the Bragg gratings 611 on the multiple optical fiber monomers 61 of the optical fiber array plate 6 are compressed and change differently, the second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger, and the photoelectric sensor generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal;

[0117] A flexible circuit board 10 has a connection end disposed on a side of the housing 1 of the fingerprint button 100 away from the opening 12 , and is connected to the photoelectric converter 2 , the optical circulator 4 and the light emitting device 8 in the fingerprint button 100 .

[0118] Specifically, the fingerprint button 100 described in the third embodiment can directly use the fingerprint button 100 provided in the first embodiment. The specific implementation structure can refer to the relevant content described in the first embodiment, which will not be repeated here.

[0119] The electronic device provided by the embodiment of the present invention uses a fingerprint button 100 which is provided with a photoelectric converter 2, a first concave lens 3, an optical circulator 4, a second concave lens 5, a fiber array plate 6 and a light emitting device 8. The light emitted by the light emitting device 8 can be emitted into the fiber array plate 6 as a first light signal through the optical circulator 4, and each optical fiber monomer 61 in the optical fiber array plate 6 is provided with a Bragg grating 611, so that the first light signal can be reflected to form a second light signal, and the second light signal can be emitted onto the photoelectric converter 2 through the optical circulator 4. When the user's finger applies pressure to the fiber array plate 6 by pressing the cover film 7, since the fingerprint of the finger has raised lines and recessed lines, the pressure acting on the multiple optical fiber monomers 61 will be different, that is, the Bragg gratings 611 in the multiple optical fiber monomers 61 are pressed longer. The amount of change in degree is different, and then the wavelength of the light reflected by the Bragg grating 611 of different optical fiber monomers 61 changes, forming a second optical signal corresponding to the user's finger fingerprint. At this time, the photoelectric sensor can convert the second optical signal to generate an unlock input signal corresponding to the pressed finger fingerprint. When the unlock input signal and the pre-stored user's fingerprint spectrum information are identical at a rate exceeding a preset threshold, the correct unlock password is entered, and the unlocking action can be executed. It should be explained that the threshold set during the above comparison is set according to the fingerprint unlocking algorithm in the prior art. The specific algorithm is known to the technicians and will not be described in detail in the present invention. It can be seen that the fingerprint button 100 provided in the embodiment of the present invention does not need to worry about the user's finger getting wet, because the fingerprint button 100 provided in the embodiment of the present invention forms an optical signal corresponding to the user's fingerprint through the change in the length of the Bragg grating 611 in different optical fiber monomers 61, and then serves as an unlocking optical signal. It is not a capacitive sensor, which solves the technical problem that the current fingerprint button 100 cannot be unlocked with wet hands.

[0120] Embodiment 4

[0121] like Figure 7 As shown, the fingerprint unlocking method proposed in the fourth embodiment of the present invention is used in the electronic device described in the third embodiment above, and is implemented by a controller and a fingerprint button in the electronic device, including:

[0122] 401. Pre-store the user's fingerprint spectrum information for use as an unlocking password.

[0123] Specifically, the user can input the fingerprint spectrum information of the specified finger by pressing the fingerprint button of the electronic device with a finger, for example, the fingerprint spectrum information of one or more fingers of the user, or the fingerprint spectrum information of multiple fingers of multiple users, and store the input fingerprint spectrum information in the storage unit of the electronic device as the pre-stored unlocking information. The input principle of the fingerprint spectrum information can refer to the functional principle of the fingerprint button in the above embodiment 1.

[0124] 402. Obtain a light signal corresponding to the user's fingerprint and convert it into an unlock input signal.

[0125] Specifically, the method of obtaining the optical signal corresponding to the user's fingerprint can refer to the introduction of the above embodiment 1, and this embodiment is briefly described as follows:

[0126] The user presses the fingerprint button with his finger, and the raised and recessed lines on the finger act on the optical fiber monomer of the optical fiber array board, thereby causing the Bragg grating length of the optical fiber monomer to change accordingly, causing the second optical signal formed based on the reflection of the first optical signal to undergo a specific wavelength change, that is, the second optical signal corresponds to the fingerprint characteristics of the user's finger. The second optical signal is then converted into an electrical signal by a photoelectric converter, that is, an electrical signal containing fingerprint spectral information, and the electrical signal is then transmitted to the controller as an unlocking input signal.

[0127] 403. Compare the unlock input signal with the pre-stored fingerprint spectrum information. If the similarity rate exceeds a preset threshold, the input fingerprint password is correct and unlocking is started.

[0128] Specifically, the method and principle of signal comparison are known to technicians and will not be elaborated in the embodiments of the present invention.

[0129] The fingerprint unlocking method provided by the embodiment of the present invention performs pairing unlocking based on the user's fingerprint spectrum information, and uses the above-mentioned fingerprint button to obtain the fingerprint spectrum information, because the fingerprint button is provided with a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate and a light-emitting device. The light emitted by the light emitting device can be injected into the optical fiber array board as a first light signal through an optical circulator. Each optical fiber monomer in the optical fiber array board is provided with a Bragg grating, so that the first light signal can be reflected to form a second light signal, and the second light signal can be injected onto the photoelectric converter through the optical circulator. When the user's finger exerts pressure on the optical fiber array board by pressing the cover film, since the fingerprint of the finger has raised lines and recessed lines, the pressure acting on multiple optical fiber monomers will be different, that is, the Bragg gratings in multiple optical fiber monomers are compressed by different length changes, and then the wavelength of the light reflected by the Bragg gratings of different optical fiber monomers changes, forming a second light signal corresponding to the user's finger fingerprint. At this time, the photoelectric sensor can convert and generate an unlocking input signal corresponding to the fingerprint of the pressed finger based on the second light signal. When the unlocking input signal and the pre-stored user's fingerprint spectrum information are identical at a rate exceeding a preset threshold, the correct unlocking password is input, and the unlocking action can be executed. It should be explained that the threshold set during the above comparison is set according to the fingerprint unlocking algorithm in the prior art. The specific algorithm is known to the technicians and will not be described in detail in the present invention. It can be seen that the fingerprint unlocking method provided by the embodiment of the present invention does not need to worry about the user's fingers getting wet, because the fingerprint unlocking method provided by the embodiment of the present invention uses a fingerprint button that forms a light signal corresponding to the user's fingerprint through the change of the Bragg grating length in different optical fiber monomers, which is then used as the unlocking light signal. It is not a capacitive sensor, which solves the technical problem that the current fingerprint button cannot be unlocked with wet hands.

[0130] It is understandable that the related features in the above devices can be referenced to each other. In addition, the "first", "second" and the like in the above embodiments are used to distinguish the various embodiments, and do not represent the advantages and disadvantages of the various embodiments.

[0131] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known structures and technologies are not shown in detail so as not to obscure the understanding of this description.

[0132] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A fingerprint button, characterized in that: include: A housing, wherein the housing is provided with an opening communicating with an internal accommodation space, and a photoelectric converter, a first concave lens, an optical circulator, a second concave lens, an optical fiber array plate, and a cover film are sequentially stacked inside the accommodation space toward the opening; A first port is arranged on a side of the optical circulator, a second port is arranged on a side facing the second concave lens, and a third port is arranged on a side facing the first concave lens; A Bragg grating is provided in each optical fiber monomer of the optical fiber array plate; The covering film covers the optical fiber array plate and the opening at the same time; A light emitting device, the light emitting device is arranged in the housing and is used to emit light into the optical circulator through a first port; Among them, the optical circulator can emit the incident light from the second port to form a first optical signal, the first optical signal is emitted into the optical fiber array board, the optical fiber array board reflects the first optical signal to form a second optical signal, the second optical signal passes through the optical circulator and is emitted from the third port to the photoelectric converter, when the finger presses on the covering film, the Bragg grating lengths on the multiple optical fiber monomers of the optical fiber array board are pressed and change differently, the second optical signal formed based on the reflection of the first optical signal forms an optical signal corresponding to the fingerprint of the pressed finger, and the photoelectric converter generates an unlocking input signal corresponding to the fingerprint of the pressed finger based on the conversion of the second optical signal.

2. The fingerprint button according to claim 1, characterized in that: The optical fiber array plate comprises a transparent substrate and a plurality of optical fiber monomers, wherein the plurality of optical fiber monomers are arranged in an array on the transparent substrate, and each of the optical fiber monomers extends along the second concave lens toward the cover film; The Bragg grating is arranged at one end of the optical fiber monomer close to the transparent substrate, and a reflective layer is arranged at the end of the optical fiber monomer away from the transparent substrate.

3. The fingerprint button according to claim 2, characterized in that: The optical fiber monomer comprises a core and a cladding layer, the core diameter is 8um-10um, and the distance between two adjacent optical fiber monomers is 40um-50um.

4. The fingerprint button according to claim 3, characterized in that: The core diameter of the optical fiber monomer is 8um, and the distance between two adjacent optical fiber monomers is 50um.

5. The fingerprint button according to claim 2, characterized in that: One end of the optical fiber monomer of the optical fiber array plate provided with a reflective layer is flush with the opening of the housing.

6. The fingerprint button according to claim 1, characterized in that: The area covered by the first light signal transmitted by the second concave lens toward the optical fiber array plate is larger than the functional area of ​​the optical fiber array plate; The functional area of ​​the optical fiber array plate is an area where a plurality of optical fiber monomers are arranged.

7. The fingerprint button according to claim 1, characterized in that: The covering film is a polyester resin film.

8. The fingerprint button according to claim 1, characterized in that: The shell is in the shape of a groove as a whole, the groove is the opening, the accommodating space is a step-shaped groove, and the accommodating space includes a first step groove, a second step groove and a third step groove which gradually increase in size from the groove bottom of the shell to the opening direction; Among them, the photoelectric converter and the first concave lens are arranged in the first step groove, the optical circulator is overlapped on the step between the first step groove and the second step groove, the second concave lens is arranged in the second step groove, and the optical fiber array plate is overlapped on the step between the second step groove and the third step groove.

9. The fingerprint button according to claim 8, characterized in that: The side wall of the housing located on the side of the accommodating space is provided with an installation cavity, the installation cavity is connected to the side of the housing away from the opening to form an installation port, the installation cavity and the side wall of the second step groove form a through hole, and the through hole is directly opposite to the first port of the optical circulator; Wherein, the light emitting device is arranged in the mounting cavity, and the light emitting end of the light emitting device faces the through hole.

10. The fingerprint button according to claim 9, characterized in that: A UV curing adhesive layer is arranged on a side of the shell away from the opening.

11. A fingerprint button module, characterized in that: include: The fingerprint button as claimed in any one of claims 1 to 10; A flexible circuit board, one connection end of which is arranged at a position of the housing of the fingerprint button away from the outlet, and is connected to the photoelectric converter, the optical circulator and the light-emitting device in the fingerprint button.

12. An electronic device, characterized in that: include: The fingerprint button module as claimed in claim 11.

13. A fingerprint unlocking method, used for fingerprint unlocking of the electronic device of claim 12, characterized in that: include: Pre-store the user's fingerprint spectrum information as the unlocking password; Obtain the optical signal corresponding to the user's fingerprint and convert it into an unlock input signal; The unlock input signal is compared with the pre-stored fingerprint spectrum information. If the similarity rate exceeds a preset threshold, the input fingerprint password is correct and unlocking is initiated.

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