CN217543880U

CN217543880U - Optical fingerprint recognizer

Info

Publication number: CN217543880U
Application number: CN202222067308.0U
Authority: CN
Inventors: 仲崇亮; 扬李木
Original assignee: Entropy Technology Co Ltd
Current assignee: Entropy Technology Co Ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-10-04
Anticipated expiration: 2032-08-08

Abstract

The application relates to the technical field of identity confirmation equipment, in particular to an optical fingerprint identification machine, which comprises: the fingerprint identification device comprises a panel, a shell and a fingerprint identification component; the panel is arranged at the front end of the shell and forms an installation cavity with the shell; the panel is provided with an acquisition window for acquiring fingerprints; fingerprint identification subassembly sets up in the installation intracavity, includes: fingerprint detector, prism and electric capacity piece. The prism is used for projecting the fingerprint on the acquisition window onto the fingerprint detector, so that the fingerprint detector can identify and judge the fingerprint on the acquisition window. And the capacitor plate can judge whether the fingerprint is an in-vivo fingerprint, so that misjudgment of the fingerprint detector caused by misjudgment of residual fingerprints as real fingerprints due to light irradiation is avoided, and the shell does not need to be modified in the mode, so that the device has a compact structure.

Description

Optical fingerprint recognizer

Technical Field

The application relates to the technical field of identity confirmation equipment, in particular to an optical fingerprint identification machine.

Background

The optical fingerprint recognizer is widely applied to the fields of fingerprint locks, access control systems, attendance systems and the like, and is equipment for collecting and recognizing fingerprints of users. Generally, a fingerprint acquisition window is arranged on the surface of the machine, and an optical component for identifying fingerprints is arranged inside the machine. Since the acquisition window will leave a residual fingerprint after acquisition. Under certain lighting conditions, the optical assembly may mistake the residual fingerprint for an authentic fingerprint.

In order to avoid the misjudgment of the optical fingerprint recognizer on the residual fingerprint, the existing solution is to provide a slot hole capable of shielding external light on the housing of the optical fingerprint recognizer and to arrange the collecting window in the slot hole. This way the overall bulk of the device is made large.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present application is to provide an optical fingerprint identification device, which is used to solve the problem that the conventional optical fingerprint identification device prevents the residual fingerprint from being misjudged, which results in a larger overall size of the device.

In order to achieve the above technical object, the present application provides an optical fingerprint recognizer, including: the fingerprint identification device comprises a panel, a shell and a fingerprint identification component;

the panel is arranged at the front end of the shell, and an installation cavity is formed by the panel and the shell;

the panel is provided with an acquisition window for acquiring fingerprints;

the fingerprint identification assembly includes: the fingerprint detector, the prism and the capacitor plate;

the fingerprint detector is arranged in the mounting cavity at a position corresponding to the acquisition window;

the prism is arranged at the front end of the fingerprint detector;

the capacitance piece is arranged on the prism and is electrically connected with the fingerprint detector.

Furthermore, an insertion groove is formed in the fingerprint detector;

one end of the prism is placed in the placing groove, and the other end of the prism extends out of the placing groove;

the capacitor plate is frame-shaped and is sleeved on the other end of the prism.

Further, the prism is a triangular prism;

one end of the prism is a tip end, and the other end of the prism is a plane end;

the front end face of the capacitor plate is flush with the front end face of the other end of the prism.

Furthermore, the device also comprises a rubber membrane;

one end of the rubber membrane is attached to the front end of the prism, and the other end of the rubber membrane is connected with the rear end of the acquisition window.

Furthermore, the rear end of the collection window is provided with a glue groove for placing the glue film sheet.

Further, the method also comprises the following steps: a lens holder and a lens;

the lens bracket is fixed in the mounting cavity;

the lens is arranged on the lens bracket;

and a lens window is arranged on the panel corresponding to the position of the lens.

Further, still include: a heat sink;

the radiating fin is attached to the rear end of the lens.

Furthermore, a positioning line is arranged beside the acquisition window.

Further, the shell comprises a front shell, a rear shell and a waterproof layer;

the panel is arranged at the front end of the front shell;

one end of the waterproof layer is abutted against the rear end of the front shell, and the other end of the waterproof layer is abutted against the front end of the rear shell;

the panel, the front shell, the rear shell and the waterproof layer enclose the mounting cavity.

Further, the capacitor plate is made of a transparent conductive material.

Further, the infrared sensor is also included;

the infrared inductor set up in on the fingerprint detector, and with the fingerprint detector electricity is connected.

It can be seen from the above technical solutions that the present application provides an optical fingerprint identification machine, including: the fingerprint identification device comprises a panel, a shell and a fingerprint identification component; the panel is arranged at the front end of the shell and forms an installation cavity with the shell; the panel is provided with an acquisition window for acquiring fingerprints; fingerprint identification subassembly sets up in the installation intracavity, includes: fingerprint detector, prism and electric capacity piece. The prism is used for projecting the fingerprint on the collection window to the fingerprint detector for the fingerprint detector can discern and judge the fingerprint on the collection window. The capacitor piece can judge whether the fingerprint is a live fingerprint or not, misjudgment caused by the fact that the fingerprint detector misjudges the residual fingerprint as a real fingerprint due to light irradiation is avoided, and the shell does not need to be transformed by the mode, so that the device has a compact structure.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic overall structure diagram of an optical fingerprint identification apparatus according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of a panel and a fingerprint identification module of an optical fingerprint identification device according to an embodiment of the present disclosure;

FIG. 3 is a sectional view of a panel and a fingerprint identification assembly of an optical fingerprint identification device according to an embodiment of the present disclosure;

FIG. 4 is an exploded view of a panel and a housing of an optical fingerprint identification machine according to an embodiment of the present disclosure;

in the figure: 10. a panel; 11. collecting a window; 12. positioning a wire; 13. a glue groove; 14. a lens window; 20. a housing; 21. a front housing; 22. a waterproof layer; 23. a rear housing; 24. hanging a wallboard; 25. a lens holder; 26. a lens; 27. a heat sink; 28. a mounting cavity; 30. a fingerprint identification component; 31. a fingerprint detector; 32. a prism; 33. a capacitor plate; 34. a film sheet; 35. an infrared sensor; 36. placing the mixture into a groove; 37. a main board; 38. and a conductive layer.

Detailed Description

The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection claimed herein.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front end", "rear end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, an optical fingerprint recognizer provided in an embodiment of the present application includes: a panel 10, a housing 20 and a fingerprint identification component 30. The panel 10 is disposed at the front end of the housing 20, and the panel 10 is hermetically connected to the housing 20. The housing 20 is hollow, and the middle portion forms an opening with an opening toward the front end, and encloses a mounting cavity 28 with the panel 10. The panel 10 is provided with a capture window 11 for capturing a fingerprint. The collecting window 11 may be a transparent cover made of glass or the like, and is used for collecting fingerprints by contacting with a finger of a user.

Referring to fig. 2, the fingerprint identification component 30 includes: a fingerprint detector 31, a prism 32 and a capacitor plate 33; the fingerprint detector 31 is disposed in the mounting cavity 28 at a position corresponding to the collecting window 11, that is, the collecting window 11 is located at the front end of the fingerprint detector 31. The prism 32 is arranged at the front end of the fingerprint detector 31; the capacitor plate 33 is disposed on the prism 32 and electrically connected to the fingerprint sensor 31.

In particular, the fingerprint detector 31 may be internally provided with a light source directed towards the acquisition window 11; light from the light source is projected through the collection window 11 onto the fingerprint and reflected back to the prism 32. Based on the principle of total reflection by the prism 32, a sharp image of the fingerprint can be obtained on the fingerprint detector 31. Meanwhile, since the human body is a conductive body, a capacitance value change is generated by the capacitance sheet 33 when the living finger touches the acquisition window 11. And when the change of the capacitance value is larger than the threshold value, judging the fingerprint as a live fingerprint, and when the change of the capacitance value is smaller than the threshold value, judging the fingerprint as a false fingerprint. The fingerprint detector 31 is electrically connected with the capacitor piece 33, can be started when the fingerprint is judged to be a living fingerprint, and can be kept in a non-starting state when the fingerprint is judged to be a false fingerprint, so that the fingerprint detector 31 can be effectively prevented from misjudging residual fingerprints.

Note that the capacitor plate 33 may be made of a transparent conductive material. The transparent conductive material may be indium tin oxide.

In the optical fingerprint recognizer of the present embodiment, the panel 10 is a flat panel, and can form a compact integral with the housing 20 without providing a structure for blocking light.

The above is the first embodiment provided in the present application, and the following is the second embodiment provided in the present application.

Referring to fig. 2 and fig. 3, on the basis of the first embodiment, in the present embodiment, the fingerprint detector 31 is provided with an inserting groove 36; one end of the prism 32 is arranged in the arranging groove 36, and the other end extends out of the arranging groove 36; the capacitor plate 33 is frame-shaped and is sleeved on the other end of the prism 32.

The insertion groove 36 can provide a stable installation position for the prism 32, and simultaneously, the overall structure of the prism 32 and the fingerprint detector 31 is more compact, which is beneficial to the miniaturization of the overall structure of the optical fingerprint identification machine. Similarly, the capacitor plate 33 is set to be frame-shaped and can be sleeved on the prism 32, so that the volume after combination is further reduced.

In the present embodiment, the prism 32 is a triangular prism; the prism 32 has a tip end at one end inserted into the groove 36 and a flat end at the other end; the capacitor sheet 33 is frame-shaped, that is, a through hole is formed in the middle of the capacitor sheet, and the size and shape of the through hole can be corresponding to the other end of the prism 32, so that a gap is prevented from being formed between the capacitor sheet 33 and the prism 32. Moreover, the front end face of the capacitor plate 33 is flush with the front end face of the other end of the prism 32, so that the whole fingerprint identification assembly 30 occupies a smaller volume.

The above is the second embodiment provided by the present application, and the following is the third embodiment provided by the present application.

Referring to fig. 2 and fig. 3, on the basis of the first or second embodiment, the present embodiment further includes a film 34; one end of the rubber film 34 is attached to the front end of the prism 32, and the other end is connected to the rear end of the collection window 11.

Specifically, the adhesive film 34 is a thin film and is made of a light-transmissive optical adhesive material. Air between the collection window 11 and the prism 32 can be removed through the adhesive film 34; and the fingerprint acquisition condition can be better acquired by matching with an image acquisition probe on the fingerprint detector 31.

In order to make the whole structure more compact, the rear end of the collecting window 11 is provided with a glue groove 13 for placing the glue film 34. In addition, in the actual production process, the glue film 34 can be formed by dropping a glue material into the glue groove 13 and solidifying the glue material, so that the installation position and the manufacturing amount of the glue film 34 can be effectively limited, the production efficiency can be improved, and the material waste can be avoided. A conductive layer 38 for conductive connection may be further disposed between the adhesive film 34 and the panel 10; conductive layer 38 is attached to the rear end of collection window 11, and adhesive film 34 is attached to conductive layer 38.

The above is the third embodiment provided by the present application, and the following is the fourth embodiment provided by the present application.

Referring to fig. 4, on the basis of any one of the above embodiments, in this embodiment, the method further includes: a lens holder 25 and a lens 26; the lens holder 25 is fixed in the mounting cavity 28; the lens 26 is disposed on the lens holder 25; a lens window 14 is provided on the panel 10 at a position corresponding to the lens 26.

The lens 26 is used for collecting an image of a user, and is matched with the fingerprint identification component 30 for multiple judgment and identification. It should be noted that a main board 37 may also be disposed in the mounting cavity 28. The main board 37 is in communication connection with an external terminal, and is electrically connected with the fingerprint detector 31, the capacitor plate 33 and the lens 26. The fingerprint detector 31 can perform the capacitance value judgment induced by the capacitance sheet 33 and control the on-off of the internal light source through the main board 37.

As a further improvement, the embodiment further includes: a heat sink 27; the heat sink 27 is attached to the rear end of the lens 26.

Further, the housing 20 includes a front shell 21, a rear shell 23 and a waterproof layer 22; the panel 10 is mounted on the front end of the front case 21; one end of the waterproof layer 22 is abutted against the rear end of the front shell 21, and the other end is abutted against the front end of the rear shell 23; the panel 10, the front shell 21, the rear shell 23 and the waterproof layer 22 enclose an installation cavity 28.

A waterproof ring may be disposed between the panel 10 and the front shell 21, so that the panel 10, the front shell 21, the waterproof layer 22, and the rear shell 23 form a sealed waterproof structure. Accordingly, the waterproof layer 22 may be in the shape of a ring. Meanwhile, the rear end of the rear case 23 may be connected to a wall hanging plate 24. The wall hanging plate 24 is provided with hanging grooves and hanging holes for hanging.

In other embodiments provided by the present scheme, a positioning line 12 is disposed beside the collection window 11, so as to remind the user of pressing the finger.

In other embodiments provided by the present disclosure, please refer to fig. 2, an infrared sensor 35 may be further included; the infrared sensor 35 is disposed on the fingerprint detector 31 and electrically connected to the fingerprint detector 31.

Specifically, the infrared sensor 35 emits infrared light toward the collecting window 11, and can transmit an infrared signal to the fingerprint detector 31 when sensing that an object or a human body approaches; the fingerprint detector 31 controls the on/off of the light source according to whether the infrared signal is received. When the fingerprint does not need to be collected, namely when the infrared signal is not received, the light source can be automatically controlled to be closed, and the energy-saving effect is achieved.

Although the present invention has been described in detail with reference to the examples, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.

Claims

1. An optical fingerprint recognizer, comprising: the fingerprint identification device comprises a panel, a shell and a fingerprint identification component;

the panel is provided with an acquisition window for acquiring fingerprints;

the prism is arranged at the front end of the fingerprint detector;

the capacitor plate is arranged on the prism and electrically connected with the fingerprint detector.

2. The optical fingerprint recognizer of claim 1, wherein the fingerprint sensor is provided with an insertion slot;

3. The optical fingerprint recognizer of claim 2, wherein the prism is a triangular prism;

the front end face of the capacitor plate is flush with the end face of the other end of the prism.

4. The optical fingerprint recognizer of claim 1, further comprising a glue film;

5. The optical fingerprint recognizer according to claim 4, wherein the rear end of the collecting window is provided with a glue groove for the glue film to be placed in.

6. The optical fingerprint recognition machine of claim 1, further comprising: a lens holder and a lens;

the lens bracket is fixed in the mounting cavity;

the lens is arranged on the lens bracket;

7. The optical fingerprint recognizer of claim 6, further comprising: a heat sink;

the radiating fin is attached to the rear end of the lens.

8. The optical fingerprint recognizer of claim 1, wherein a positioning line is disposed beside the collection window.

9. The optical fingerprint recognizer of claim 1, wherein the housing comprises a front shell, a rear shell and a waterproof layer;

the panel is arranged at the front end of the front shell;

10. The optical fingerprint recognizer of claim 1, further comprising an infrared sensor;