CN107341433B - Concealed fingerprint collector - Google Patents
Concealed fingerprint collector Download PDFInfo
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- CN107341433B CN107341433B CN201610317254.5A CN201610317254A CN107341433B CN 107341433 B CN107341433 B CN 107341433B CN 201610317254 A CN201610317254 A CN 201610317254A CN 107341433 B CN107341433 B CN 107341433B
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- 239000000758 substrate Substances 0.000 claims abstract description 32
- 239000011148 porous material Substances 0.000 claims abstract description 26
- 230000003287 optical effect Effects 0.000 claims description 36
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 description 9
- 239000004568 cement Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
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- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The embodiment of the invention discloses a hidden fingerprint collector which comprises a transparent cover plate, a bracket and a light emitter. The lower surface of the cover plate is coated with an ink layer; the ink layer is provided with a plurality of small holes which can transmit light and are uniformly arrayed. The bracket is arranged below the ink layer, and the bottom of the bracket is provided with the circuit substrate; the upper surface of the bracket, the upper surface of the circuit substrate and the lower surface of the ink layer enclose a cavity. The cavity and the lower part of the cover plate are provided with small pore plates, the upper surface of each small pore plate is provided with a shading layer, and the shading layer is provided with a plurality of small holes which are uniformly arrayed and can transmit light. The small holes on the shading layer correspond to the positions right below the small holes of the ink layer. An image collector is arranged below the small pore plate. The illuminator is arranged outside the cavity and emits oblique light rays to the cover plate. The invention can enable the fingerprint collector to be arranged below the panel coated with the ink, can not influence the appearance of the electronic equipment, and can also meet the requirement of more ultrathin electronic equipment.
Description
Technical Field
The invention relates to the technical field of image acquisition, in particular to a hidden fingerprint acquisition device.
Background
In general, a substance having a shielding effect on visible light such as ink is coated under a transparent cover plate of some electronic devices (such as smart phones) to form a shielding coating under the transparent cover plate, and the transparent cover plate of the electronic device is made to have the same color as that of the ink, so as to increase the aesthetic property of the device. The hidden fingerprint collector is arranged below the shielding coating, does not need to damage the shielding coating or open holes or dig grooves in the cover plate, and is invisible outside the electronic equipment, so that the consistency of the surface appearance of the electronic equipment is maintained, and the anti-falling performance of the equipment is improved.
The inventors of the present invention have disclosed a thin optical fingerprint sensor in patent application number CN 201520290873.0. Fig. 1 shows a schematic structure of a disclosed slim type optical fingerprint sensor. As shown in fig. 1, the thin optical fingerprint collector comprises a light guide plate 1, a light emitting device 2 arranged on the outer side surface of the light guide plate, a bracket 7 arranged below the light guide plate, an auxiliary circuit board 9 connected to the bottom of the bracket, a fingerprint chip 8 arranged in a cavity enclosed between the bracket 7 and the auxiliary circuit board 9, and an auxiliary circuit board 9 electrically connected below the fingerprint chip. The fingerprint collector shown in fig. 1 is provided with the light emitting device 2 and the bracket 7 separately, is convenient to process, and has small volume and thin thickness.
Because the near infrared light source or the infrared light source can penetrate the printing ink, when the fingerprint collector with the structure is used as the invisible collector, the thin hidden fingerprint collector can be formed by only enabling the light emitting device 2 to emit the near infrared light source or the infrared light source.
When electronic equipment tends to be in an ultrathin structure, manufacturers of electronic equipment need a thinner hidden fingerprint collector, and how to reduce the thickness of the existing thin hidden fingerprint collector and ensure the beauty of the electronic equipment becomes a technical problem to be solved by the technicians in the technical field.
Disclosure of Invention
The invention aims to provide a hidden fingerprint collector which is thinner than the existing optical fingerprint collector and does not influence the appearance of electronic equipment at all.
According to one aspect of the present invention, there is provided a hidden fingerprint sensor comprising a transparent cover plate, a bracket, a light emitter, an image sensor and a circuit substrate,
the lower surface of the cover plate is coated with an ink layer; the ink layer is provided with a plurality of small holes which are uniformly arrayed;
the support is arranged below the ink layer, and the circuit substrate is arranged at the bottom of the support; the upper surface of the bracket, the upper surface of the circuit substrate and the lower surface of the ink layer enclose a cavity;
a small pore plate is arranged in the cavity and below the cover plate, a shading layer is arranged on the upper surface of the small pore plate, and a plurality of light-permeable small pores which are uniformly arrayed are formed in the shading layer; the small holes on the shading layer correspond to the positions right below the small holes of the ink layer;
the image collector is arranged below the small pore plate;
the light emitter is arranged outside the cavity and emits oblique light rays capable of penetrating the ink layer to the cover plate.
The included angle between the oblique light entering the transparent cover plate and the normal direction of the surface of the transparent cover plate is alpha, and the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 )；
Wherein n is 1 Refractive index of medium outside transparent cover plate when not pressing finger, n 2 For refractive index of finger surface, n 0 Is the refractive index of the transparent cover plate.
Preferably, the light emitter is arranged at the periphery of the bracket, below, at the side end or above the transparent cover plate;
transparent optical cement is filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical cement is the same as or similar to that of the transparent cover plate.
As one preferable scheme, the light emitter is arranged at the periphery of the bracket and below the transparent cover plate; the included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate is 90-alpha.
As another preferable mode, the light emitter is arranged at the periphery of the bracket and below the transparent cover plate; the central optical axis direction of the light emitter is parallel to the lower surface of the transparent cover plate;
a reflecting surface is arranged between the light emitter and the bracket, and the angle between the reflecting surface and the lower surface of the transparent cover plate is (90-alpha)/2.
Further preferably, the reflecting surface is further provided with a longitudinal diffusion groove.
Preferably, the light emitter is a near infrared light emitter emitting near infrared rays or an infrared light emitter emitting infrared rays.
According to another aspect of the present invention, there is also provided a hidden fingerprint sensor comprising a transparent cover plate, a bracket, a light emitter, an image sensor and a circuit substrate,
the lower surface of the cover plate is coated with a light-permeable printing ink layer and a light-impermeable shading layer from top to bottom; the area of the light-transmitting ink layer is larger than that of the shading layer; a plurality of small holes are uniformly arrayed on the shading layer;
the support is arranged below the shading layer, and the circuit substrate is arranged at the bottom of the support; the support, the upper surface of the circuit substrate and the lower surface of the shading layer enclose a cavity;
a light-transmitting plate is arranged in the cavity and below the shading layer, and the image collector is arranged below the light-transmitting plate;
the light emitter is arranged outside the cavity and emits oblique light which can penetrate through the light-transmitting ink layer to the cover plate.
The included angle between the oblique light entering the transparent cover plate and the normal direction of the surface of the transparent cover plate is alpha, and the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 )；
Wherein n is 1 Refractive index of medium outside transparent cover plate when not pressing finger, n 2 For refractive index of finger surface, n 0 Is the refractive index of the transparent cover plate.
Preferably, the light emitter is arranged at the periphery of the bracket, below, at the side end or above the transparent cover plate;
transparent optical cement is filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical cement is similar to that of the transparent cover plate.
As one of the preferable schemes, the light emitter is arranged at the periphery of the bracket and below the transparent cover plate; the included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate is 90-alpha.
As another preferable mode, the light emitter is arranged at the periphery of the bracket and below the transparent cover plate; the central optical axis direction of the light emitter is parallel to the lower surface of the transparent cover plate;
a reflecting surface is arranged between the light emitter and the bracket, and the angle between the reflecting surface and the lower surface of the transparent cover plate is (90-alpha)/2.
Preferably, the reflecting surface is further provided with a longitudinal diffusion groove.
Preferably, the light shielding layer is an opaque ink layer; the light emitter is a near infrared light emitter emitting near infrared rays or an infrared light emitter emitting infrared rays.
As still another aspect of the present invention, there is also provided a hidden fingerprint sensor including a transparent cover plate, a bracket, a light emitter, an image sensor and a circuit substrate,
the lower surface of the cover plate is coated with a first printing ink layer which can transmit light and forms a closed ring shape; the support is arranged below the first ink layer, and the circuit substrate is arranged at the bottom of the support; the support, the upper surface of the circuit substrate and the lower surface of the transparent cover plate enclose a cavity;
a small pore plate coated with a non-light-transmitting second ink layer is arranged in the cavity and below the cover plate, and a plurality of small holes which are uniformly arrayed are formed in the second ink layer of the small pore plate; the edge of the upper surface of the small pore plate is abutted against the inner ring edge of the closed annular first ink layer; the non-ink-coated area surrounded by the inner annular edge of the first ink layer and the upper surface of the small pore plate form an air layer;
the image collector is arranged below the small pore plate;
the light emitter is arranged outside the cavity and emits light rays capable of penetrating the first ink layer to the cover plate.
The included angle between the oblique light entering the transparent cover plate and the normal direction of the surface of the transparent cover plate is alpha, and the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 )；
Wherein n is 1 Refractive index of medium outside transparent cover plate when not pressing finger, n 2 For refractive index of finger surface, n 0 Is the refractive index of the transparent cover plate.
Preferably, the light emitter is arranged at the periphery of the bracket, below, at the side end or above the transparent cover plate;
transparent optical cement is filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical cement is the same as or similar to that of the transparent cover plate.
As one preferable scheme, the light emitter is arranged at the periphery of the bracket and below the transparent cover plate; the included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate is 90-alpha.
As another preferable mode, the light emitter is arranged at the periphery of the bracket and below the transparent cover plate; the central optical axis direction of the light emitter is parallel to the lower surface of the transparent cover plate;
a reflecting surface is arranged between the light emitter and the bracket, and the angle between the reflecting surface and the lower surface of the transparent cover plate is (90-alpha)/2.
Further preferably, the reflecting surface is further provided with a longitudinal diffusion groove.
Preferably, the light emitter is a near infrared light emitter emitting near infrared rays or an infrared light emitter emitting infrared rays.
According to the technical scheme, compared with the existing fingerprint collector, the hidden fingerprint collector provided by the embodiment of the application omits the light guide plate, greatly reduces the distance between the transparent cover plate and the image collector, enables the thickness of the hidden collector to be thinner, and does not influence the appearance of the electronic equipment at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of the structure of a disclosed slim optical fingerprint sensor;
FIG. 2 is a schematic diagram of a hidden fingerprint sensor according to a preferred embodiment;
FIG. 3 is a schematic diagram of a hidden fingerprint sensor according to another preferred embodiment;
FIG. 4 is a schematic diagram of a hidden fingerprint sensor according to yet another preferred embodiment;
fig. 5 is a schematic structural view of a hidden fingerprint sensor according to still another preferred embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The structure and working principle of the hidden fingerprint collector in the application are described in detail below through specific embodiments.
Fig. 2 is a schematic structural view of a hidden fingerprint sensor according to a preferred embodiment. As shown in fig. 2, the hidden fingerprint sensor includes a transparent cover plate 101, a bracket 102, a light emitter 103, an image sensor 104, and a circuit substrate 105.
The lower surface of the transparent cover plate 101 is coated with an ink layer 106. The ink layer 106 is provided with a uniform array of a plurality of light transmissive apertures 107. The holder 102 is mounted below the ink layer, and a circuit substrate 105 is mounted on the bottom of the holder 102. The support 102, the upper surface of the circuit substrate 105 and the lower surface of the ink layer enclose a hollow cavity.
A small orifice plate 108 is disposed within the cavity below the cover plate. The upper surface of the aperture plate 108 is provided with a light shielding layer 109, and the light shielding layer 109 is provided with a plurality of light-permeable apertures 110 which are uniformly arrayed. The aperture 110 in the light shielding layer 109 corresponds in position to directly below the ink layer aperture. Preferably, the aperture of the aperture 110 in the light shielding layer is smaller than the aperture of the ink layer aperture 107. The image collector 104 is disposed below the aperture plate. The image collector is fixed on the circuit substrate 105 and is electrically connected to the circuits in the circuit substrate 105.
It should be noted that, the aperture of the light shielding layer is smaller than that of the aperture of the ink layer, and the size relationship between the aperture of the aperture on the light shielding layer and that of the aperture on the ink layer is not particularly limited in this embodiment, so long as the light incident from the aperture of the light shielding layer can be incident on the image collector through the aperture of the ink layer and the aperture plate.
The light emitter 103 is disposed outside the cavity and emits oblique light toward the cover plate. Preferably, the light emitter is a near infrared light emitter emitting near infrared rays or an infrared light emitter emitting infrared rays. The included angle between the oblique light entering the transparent cover plate 101 and the normal direction of the surface of the transparent cover plate 101 is alpha, and the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein n is 1 Refractive index of medium outside transparent cover plate 101 when not pressing finger, n 2 For refractive index of finger surface, n 0 Is the refractive index of the transparent cover plate 101. For example, when n 1 =1.0 (refractive index of air), n 2 ＝1.33，n 0 When=1.5 (refractive index of glass), 41.8 degrees a.ltoreq.62.5 is calculated. When the cover plate is not stamped by fingers, the light rays injected at the angle can form total reflection on the upper surface of the cover plate.
The light emitted by the light emitter 103 is inclined when entering the transparent cover plate 101, and can be realized by different schemes. As a preferred embodiment among the embodiments, the light emitter 103 is disposed at the periphery of the holder 102 and under the transparent cover plate 101, and an angle between the central optical axis direction of the light emitter 103 and the lower surface of the transparent cover plate 101 is 90 ° - α. The included angle between the central optical axis direction of the light emitter 103 and the lower surface of the transparent cover plate is 90 ° - α, that is, the included angle between the light emitted from the central optical axis direction of the light emitter 103 and the lower surface of the transparent cover plate is 90 ° - α.
As another preferred embodiment, the drop light emitters 103 are still disposed below the transparent cover plate at the periphery of the support 102. Fig. 3 is a schematic structural view of a hidden fingerprint sensor according to another preferred embodiment. As shown in fig. 3, unlike the embodiment shown in fig. 2, in the scheme shown in fig. 2, the central optical axis direction of the light emitter 103 is parallel to the lower surface of the transparent cover plate, i.e., the light emitter 103 emits parallel light parallel to the lower surface of the transparent cover plate 101. A reflecting surface 111 is further provided between the light emitter 103 and the holder 102, and an angle between the reflecting surface 111 and the lower surface of the transparent cover plate 101 is (90 ° - α)/2.
In order to make the reflecting surface have better diffusion function, further, longitudinal diffusion grooves (not shown) can be formed on the reflecting surface, and the diffusion grooves can make the light incident into the transparent cover plate 101 more uniform on the horizontal plane. The longitudinal direction in this embodiment is the direction perpendicular to the paper surface in fig. 1.
The above-mentioned position of the light emitter 103 below the transparent cover plate 101 at the periphery of the bracket 102 is only a preferable embodiment, and is not intended to limit the installation position of the light emitter 103. As other embodiments, the light emitter 103 in the present application may be disposed at a side end of the transparent cover plate 101, or above the transparent cover plate 101. The setting position of the light emitter 103 is not specifically limited in this application, as long as the position where the included angle between the light emitted by the light emitter and the normal direction of the surface of the transparent cover plate 101 after entering the transparent cover plate 101 is α falls within the protection scope of the present invention.
In order to enable light rays of the light emitter to enter the transparent cover plate at a set angle, the transparent optical adhesive is preferably filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical adhesive is the same as or similar to that of the transparent cover plate.
The hidden fingerprint sensor in the above embodiment is different from the existing fingerprint sensor in that the light guide plate and the air layer in the existing fingerprint sensor are omitted, so that the thickness thereof is greatly reduced. The working principle of the hidden fingerprint sensor in the above embodiment is explained in detail as follows.
When the hidden fingerprint collector is in an electrified state, oblique light rays emitted by the light emitter 103 are totally reflected in the transparent cover plate 101 through the ink layer 106 on the lower surface of the transparent cover plate 101. When a finger presses on the transparent cover plate 101, the ridges on the fingerprint are closely contacted with the transparent cover plate 101 because the surface of the fingerprint is distributed in ridges and valleys, and light is reflected at the interface between the transparent cover plate 101 and air and irradiates the photosensitive element of the image collector 104 through the small holes on the light shielding layer and the small holes on the ink layer. When the finger presses on the transparent cover plate 101, the ridge on the fingerprint contacts with the transparent cover plate 101, so that the total reflection of light is destroyed, a part of light escapes from the transparent cover plate 101, the surface of the finger is illuminated, and the light is reflected by the surface of the finger and passes through the imaging small hole, so that a clear fingerprint image is formed on the image sensor.
According to another aspect of the present invention, there is also provided a hidden fingerprint sensor, which is used in an electronic device having a recess structure such as a small hole formed under a cover plate.
Fig. 4 is a schematic structural view of a hidden fingerprint sensor according to still another preferred embodiment. As shown in fig. 4, the hidden fingerprint sensor in this embodiment includes a transparent cover 401, a bracket 402, a light emitter 403, an image sensor 404, and a circuit substrate 405, similar to the structure of the hidden fingerprint sensor shown in fig. 1. The difference is that:
in this embodiment, the lower surface of the transparent cover plate 401 is coated with a first ink layer 406 constituting a closed loop shape. The bracket 402 is mounted below the first ink layer, and the bottom of the bracket 402 mounts the circuit substrate. The bracket 402, the upper surface of the circuit substrate and the lower surface of the transparent cover plate 401 enclose a hollow cavity. A small pore plate 408 coated with a light-tight second ink layer 407 is arranged in the cavity and below the cover plate, and a plurality of small pores 409 are uniformly arrayed on the upper surface of the small pore plate. The edge of the upper surface of the orifice plate 408 abuts against the inner annular edge of the closed annular first ink layer, and the area of the first ink layer surrounded by the inner annular edge of the first ink layer that is not coated with ink forms an air layer 410 with the upper surface of the orifice plate. Wherein the thickness of the air layer 410 is preferably greater than 100 nanometers.
The image collector is arranged below the small pore plate. The image collector is fixed on the circuit substrate and is electrically connected with the circuit in the circuit substrate.
The light emitter 403 is disposed outside the cavity and emits oblique light that can pass through the first ink layer toward the cover plate. The included angle between the oblique light entering the transparent cover plate 401 and the normal direction of the surface of the transparent cover plate 401 is alpha, and the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 ) The method comprises the steps of carrying out a first treatment on the surface of the Where n1 is the refractive index of the medium outside the transparent cover 401 when the finger is not pressed, n2 is the refractive index of the finger surface, and n0 is the refractive index of the transparent cover 401. For example, when n 1 =1.0 (refractive index of air), n 2 ＝1.33，n 0 When=1.5 (refractive index of glass), 41.8 degrees a.ltoreq.62.5 is calculated. When the cover plate is not stamped by fingers, the light rays injected at the angle can form total reflection on the upper surface of the cover plate.
Since there is an air layer under the cover plate, the following condition is satisfied as long as the incident angle of the incident light rays: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 ) The incident light may form total reflection within the transparent cover 401.
The light emitted by the light emitter is inclined when entering the transparent cover plate 401, and can be realized by different schemes. As a preferred embodiment of the embodiments, a light emitter is disposed at the periphery of the bracket 402 and under the transparent cover 401, and an angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover 401 is 90 ° - α. The included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate 401 is 90 ° - α, that is, the included angle between the light emitted from the central optical axis direction of the light emitter and the lower surface of the transparent cover plate 401 is 90 ° - α.
As another preferred embodiment, the light lowering emitters are still disposed at the periphery of the support 402 below the transparent cover plate 401. Unlike the above-described embodiment, in this embodiment, the central optical axis direction of the light emitter is parallel to the lower surface of the transparent cover plate 401. A reflective surface is also provided between the light emitter and the support 402, which is of the same construction as the reflective surface in fig. 3 and is not shown here. The angle between the reflecting surface and the lower surface of the transparent cover plate 401 is (90 deg. - α)/2.
In order to make the reflecting surface have better diffusion function, further, longitudinal diffusion grooves can be formed on the reflecting surface, and the diffusion grooves can make the light rays incident into the transparent cover plate 401 more uniform on the horizontal plane. The longitudinal direction in this embodiment is the direction perpendicular to the paper surface in fig. 4.
In order to enable light rays of the light emitter to enter the transparent cover plate at a set angle, the transparent optical adhesive is preferably filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical adhesive is the same as or similar to that of the transparent cover plate.
The working principle of the hidden fingerprint sensor in this embodiment will be described in detail.
When the hidden fingerprint collector is in an electrified state, the illuminator emits oblique light, and the light emitted by the illuminator enters the transparent cover plate through the first ink layer on the lower surface of the transparent cover plate. Because the air layer is reserved between the transparent cover plate and the small pore plate, the oblique light rays emitted by the light emitter are totally reflected in the transparent cover plate. When a finger presses on the transparent cover plate, the ridges and valleys on the surface of the fingerprint are distributed, the ridges on the fingerprint are closely contacted with the transparent cover plate, and light is reflected at the interface of the transparent cover plate and air and irradiates onto a photosensitive element of the image collector through the small holes on the second ink layer on the upper surface of the small hole plate. When the finger presses on the transparent cover plate 1, the ridge on the fingerprint is contacted with the transparent cover plate 1, the total reflection of inclined light rays is destroyed, a part of inclined light rays escape the transparent cover plate 1, the surface of the finger is illuminated, the finger is reflected by the surface of the finger and passes through the imaging small hole, and therefore a clear fingerprint image is formed on the image sensor.
According to yet another aspect of the present invention, there is also provided a hidden fingerprint sensor. The structure of the hidden fingerprint sensor in this embodiment is similar to that of the hidden fingerprint sensor shown in fig. 2.
Fig. 5 is a schematic structural view of a hidden fingerprint sensor according to still another preferred embodiment. As shown in fig. 5, the hidden fingerprint sensor includes a transparent cover plate 501, a holder 502, a light emitter 503, an image sensor 504, and a circuit substrate 505.
The lower surface of the cover plate 501 is coated with a light-transmissive ink layer 506 that is light-transmissive and a light-blocking layer 507 that is light-opaque from top to bottom. The area of the light-transmitting ink layer is larger than that of the shading layer. The light shielding layer 507 is provided with a plurality of small holes 508 in a uniform array. Preferably, the light shielding layer may be an opaque ink layer.
The holder 502 is mounted below the light shielding layer, and a circuit board 505 is mounted on the bottom of the holder 502. The upper surface of the bracket, the upper surface of the circuit substrate and the lower surface of the shading layer enclose a cavity. A light-transmitting plate 509 is provided in the cavity and below the light-shielding layer, and an image pickup unit 504 is provided below the light-transmitting plate 509.
The illuminator is arranged outside the cavity and emits oblique light which can penetrate through the light-transmitting ink layer to the cover plate. The light emitter is preferably a near infrared light emitter emitting near infrared rays or an infrared light emitter emitting infrared rays. It is obvious that the function of collecting the finger print in the invention can be achieved by using a visible light illuminator if the corresponding position of the cover plate is not coated with ink.
The light emitter in this embodiment is the same as the light emitter in the hidden fingerprint sensor shown in fig. 2, and will not be described here again. Meanwhile, the hidden fingerprint collector in this embodiment has the same working principle as the hidden fingerprint collector shown in fig. 2, and will not be described again here.
According to the technical scheme, compared with the existing fingerprint collector, the hidden fingerprint collector in each embodiment omits the light guide plate, and greatly reduces the distance between the transparent cover plate and the image collector, so that the hidden fingerprint collector is thinner, and the appearance of the electronic equipment is not affected at all.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise methods that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. A hidden fingerprint collector comprises a transparent cover plate, a bracket, a light emitter, an image collector and a circuit substrate, and is characterized in that,
the lower surface of the cover plate is coated with an ink layer; the ink layer is provided with a plurality of small holes which are uniformly arrayed;
the support is arranged below the ink layer, and the circuit substrate is arranged at the bottom of the support; the upper surface of the bracket, the upper surface of the circuit substrate and the lower surface of the ink layer enclose a cavity;
a small pore plate is arranged in the cavity and below the cover plate, a shading layer is arranged on the upper surface of the small pore plate, and a plurality of light-permeable small pores which are uniformly arrayed are formed in the shading layer; the small holes on the shading layer correspond to the positions right below the small holes of the ink layer;
the image collector is arranged below the small pore plate;
the illuminator is arranged at the periphery of the bracket and below the transparent cover plate, and emits light rays capable of penetrating the ink layer to the cover plate;
an included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate is 90-alpha, wherein alpha is an included angle between the light entering the transparent cover plate and the normal direction of the surface of the transparent cover plate;
the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 )；
Wherein n is 1 Transparent cover plate for not pressing fingerRefractive index of external medium, n 2 For refractive index of finger surface, n 0 Is the refractive index of the transparent cover plate.
2. A hidden fingerprint collector comprises a transparent cover plate, a bracket, a light emitter, an image collector and a circuit substrate, and is characterized in that,
the lower surface of the cover plate is coated with a light-permeable printing ink layer and a light-impermeable shading layer from top to bottom; the area of the light-transmitting ink layer is larger than that of the shading layer; a plurality of small holes are uniformly arrayed on the shading layer;
the support is arranged below the shading layer, and the circuit substrate is arranged at the bottom of the support; the support, the upper surface of the circuit substrate and the lower surface of the shading layer enclose a cavity;
a light-transmitting plate is arranged in the cavity and below the shading layer, and the image collector is arranged below the light-transmitting plate;
the light emitter is arranged at the periphery of the bracket and below the transparent cover plate, and emits light rays capable of penetrating the light-transmitting ink layer to the cover plate;
an included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate is 90-alpha, wherein alpha is an included angle between the light entering the transparent cover plate and the normal direction of the surface of the transparent cover plate;
the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 )；
Wherein n is 1 Refractive index of medium outside transparent cover plate when not pressing finger, n 2 For refractive index of finger surface, n 0 Is the refractive index of the transparent cover plate.
3. The hidden fingerprint sensor of claim 2, wherein a transparent optical adhesive is filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical adhesive is the same as or similar to the refractive index of the transparent cover plate.
4. A hidden fingerprint sensor according to any one of claims 2 to 3, comprising at least one of the following features:
the shading layer is an opaque ink layer;
the light emitter is a near infrared light emitter emitting near infrared rays or an infrared light emitter emitting infrared rays.
5. A hidden fingerprint collector comprises a transparent cover plate, a bracket, a light emitter, an image collector and a circuit substrate, and is characterized in that,
the lower surface of the cover plate is coated with a first ink layer forming a closed ring shape; the support is arranged below the first ink layer, and the circuit substrate is arranged at the bottom of the support; the support, the upper surface of the circuit substrate and the lower surface of the transparent cover plate enclose a cavity;
a small pore plate coated with a non-light-transmitting second ink layer is arranged in the cavity and below the cover plate, and a plurality of small holes which are uniformly arrayed are formed in the second ink layer of the small pore plate; the edge of the upper surface of the small pore plate is abutted against the inner ring edge of the closed annular first ink layer; the non-ink-coated area surrounded by the inner annular edge of the first ink layer and the upper surface of the small pore plate form an air layer;
the image collector is arranged below the small pore plate;
the light emitter is arranged at the periphery of the bracket and below the transparent cover plate, and emits light rays capable of penetrating through the first ink layer to the cover plate;
an included angle between the central optical axis direction of the light emitter and the lower surface of the transparent cover plate is 90-alpha, wherein alpha is an included angle between the light entering the transparent cover plate and the normal direction of the surface of the transparent cover plate;
the alpha satisfies the following conditions: arcsin (n) 1 /n 0 )≤α≤arcsin(n 2 /n 0 )；
Wherein n is 1 Refractive index of medium outside transparent cover plate when not pressing finger, n 2 Is refractive to the surface of the fingerRate, n 0 Is the refractive index of the transparent cover plate.
6. The hidden fingerprint sensor of claim 5, wherein a transparent optical adhesive is filled between the light emitter and the transparent cover plate, and the refractive index of the transparent optical adhesive is the same as or similar to the refractive index of the transparent cover plate.
7. A hidden fingerprint sensor according to any one of claims 5 to 6, wherein the light emitter is a near infrared light emitter emitting near infrared light or an infrared light emitter emitting infrared light.
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| CN2016102808549 | 2016-04-28 | ||
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204423387U (en) * | 2014-11-14 | 2015-06-24 | 深圳印象认知技术有限公司 | Imaging plate, image acquisition device and terminal |
| CN105184282A (en) * | 2015-10-14 | 2015-12-23 | 京东方科技集团股份有限公司 | Optical fingerprint detection device and display equipment |
| CN105184230A (en) * | 2015-08-14 | 2015-12-23 | 上海箩箕技术有限公司 | Optical fingerprint sensor and electronic product |
| CN205692181U (en) * | 2016-04-28 | 2016-11-16 | 深圳印象认知技术有限公司 | Concealed fingerprint capturer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001088835A1 (en) * | 2000-05-15 | 2001-11-22 | Identix Incorporated | Fingerprint imaging device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204423387U (en) * | 2014-11-14 | 2015-06-24 | 深圳印象认知技术有限公司 | Imaging plate, image acquisition device and terminal |
| CN105184230A (en) * | 2015-08-14 | 2015-12-23 | 上海箩箕技术有限公司 | Optical fingerprint sensor and electronic product |
| CN105184282A (en) * | 2015-10-14 | 2015-12-23 | 京东方科技集团股份有限公司 | Optical fingerprint detection device and display equipment |
| CN205692181U (en) * | 2016-04-28 | 2016-11-16 | 深圳印象认知技术有限公司 | Concealed fingerprint capturer |
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