CN204808360U

CN204808360U - Optical prism module

Info

Publication number: CN204808360U
Application number: CN201520553782.1U
Authority: CN
Inventors: 李文山
Original assignee: Andisi Co Ltd
Current assignee: Andisi Co Ltd
Priority date: 2015-07-28
Filing date: 2015-07-28
Publication date: 2015-11-25
Anticipated expiration: 2025-07-28

Abstract

The utility model relates to an optical prism module, it contains: a collection face of locating the optical prism module top, one faces the bottom surface that should just be located the optical prism module bottom with the collection, a mirror surface of locating optical prism module one end has first contained angle between this mirror surface and the collection face, and has the second contained angle between this mirror surface and the bottom surface, and an output face of locating the optical prism module other end, have the third contained angle between this output face and the collection face, and have the fourth contained angle between this output face and the bottom surface. Borrow this, can let the operator place the fingerprint on the face of collection, make the light source shine on the fingerprint by the bottom surface input to carry out the first reflection and the secondary reflection of light respectively with bottom surface and mirror surface, later background face and light output during as light secondary reflection by the output face let outside image sensor ware receive light and form a fingerprint image, and reach the efficiency that effectively keeps the light path distance and reduce the optical prism module volume.

Description

Optical prism module

Technical field

The utility model is a kind of optical prism module, and espespecially one can be used for identification of fingerprint equipment, as the optical prism module that light transmission uses.

Background technology

General existing optical finger print image capture unit, usually can be made up of prism, convex lens, image sensor and light source, wherein this prism is that del is arranged, the first side of the corresponding prism of these convex lens, this image sensor is corresponding with convex lens, and the second side of the corresponding prism of this light source.

When deployed, allow operator fingerprint is placed in the 3rd side of prism, now light source is irradiated by the second side of prism simultaneously, and makes light be reflexed to the first side of prism by fingermark image, and then focus in image sensor after making light enter convex lens, so as to carrying out identification of fingerprint.

But with above-mentioned existing optical finger print image capture unit, the volume of its prism usually can be limited to shape and cannot reduce, cause cannot effectively applying on the electronic installation of current miniaturization.

For solving the disappearance of conventional optical fingerprint image capture unit, just Patents such as People's Republic of China's patent of invention publication number is had to be " fingerprint collecting method and the high-resolution thin type fingerprint collector " of CN101034437A, it is little for solving prior art collection face, the problem of poor definition, its method is that light source is irradiated to prism bottom surface by prism, on the mirror surface that fingerprint on prism bottom surface reflexes to prism oblique girdle plane and on the pitch-dark layer of prism upper bottom surface, fingerprint image on mirror surface and pitch-dark layer again by the straight middle surface of prism and lens projects on photoelectric detector.Collector is greater than high right-angled trapezium prism, lens and photoelectric detector by light source, base, longitudinal section and forms, lens and photoelectric detector are configured in prism straight middle surface side, the oblique girdle plane of prism is equipped with mirror surface, the reflective mirror of oblique layout is configured with outside lens, it is photoelectric detector above reflective mirror, it is characterized in that prism upper bottom surface scribbles pitch-dark layer, pitch-dark layer and mirror surface are as reflecting surface.It is large that method has fingerprint reflecting surface, gathers area large, the advantage that sharpness is high.Collector have volume little, lightweight, gather that fingerprint image area is large, sharpness is high, collector and prism can realize ultra-thin, the advantage of the convenient equipment adapted that installing space is limited such as with slide-mouse, keyboard, door lock, automobile, mobile phone.

For another " fingerprint acquisition device " that People's Republic of China's patent of invention publication number is CN102004912B, it comprises light source, prism, photodetector and image sensor.Prism has fingerprint collecting face, reflecting surface and exit facet.This photodetector has lens, and is located at the catoptron between these exit facet and lens, between this lens and image sensor respectively.The light that light source sends injects this prism, detects the light of this exit facet injection, and be transmitted to this image sensor within the scope of its view angle.This reflecting surface is asymmetric relative to the Observing axis of this photodetector, makes light by prism one jiao of outgoing; And through the reflection of catoptron by catadioptric for the light path excess room in prism side.Therefore, there is the advantage reducing volume, adapt to the trend of product miniaturization.

Although above-mentioned each Patent Case is after making light enter prism, photoelectric detector is exported to again in the mode of reflection, so as to utilizing the mode of reflected light path, single light path is shortened, and then reach the volume reducing fingerprint acquisition device, but, though this mode can improve the disappearance of conventional optical fingerprint image capture unit, but with those prisms through primary event light path, still cannot meet the electronic product of day by day microminiaturized (slimming) at present, therefore, the product of above-mentioned all kinds of prior art still has weak point in practice.

Given this, the inventor spy of this case concentrates on studies, and develops a kind of optical prism module, to improving the disadvantages of above-mentioned prior art.

Utility model content

The purpose of this utility model is to propose a kind of optical prism module, operator can be allowed to be placed on collection face by fingerprint, light source is inputted by bottom surface to be irradiated on fingerprint, and the first reflection carrying out light respectively with bottom surface and minute surface reflects with second time, exported as the background surfaces during reflection of light second time and light by output face afterwards, allow outside image sensor receive light and to form fingermark image, and reach effective maintenance optical path distance and reduce effect of optical prism modular volume.

For reaching above-mentioned purpose, the technical solution of the utility model is, a kind of optical prism module, and it includes: a collection face putting district as fingerprint, is located at the top of this optical prism module; One can carry out the bottom surface of first reflection as light source input to light, corresponding with this collection face and be positioned at the bottom of this optical prism module; One can coordinate this bottom surface to carry out the minute surface of second time reflection to light, is located at one end of this optical prism module, has the first angle between this minute surface and this collection face, and have the second angle between this minute surface and this bottom surface; And one as the background surfaces of second time reflection also simultaneously as the output face that light exports, can be located at the other end of this optical prism module, and has the 3rd angle between this output face and this collection face, and have the 4th angle between this output face and this bottom surface.

In the above embodiments, this optical prism module is the optical prism module be made up of glass or plastic cement.

In the above embodiments, this first angle is obtuse angle.

In the above embodiments, the 3rd angle is acute angle.

In the above embodiments, this second angle and the 4th angle can select a suitable angle on demand.

Optical prism module of the present utility model effectively can keep optical path distance, and reduces the volume of optical prism module.

Accompanying drawing explanation

Fig. 1 is side-looking structural representation of the present utility model.

Fig. 2 is using state schematic diagram of the present utility model.

Light path schematic diagram when Fig. 3 is the utility model use.

Description of reference numerals:

1 optical prism module

11 gather face

111 fingerprints put district

12 bottom surfaces

13 minute surfaces

14 output faces

101 first angles

102 second angles

103 the 3rd angles

104 the 4th angles

2 light sources

3 image sensor

31 camera lenses

A left end point

A left end incident ray

B central point

B central authorities incident ray

C right endpoint

C right-hand member incident ray

A ' left end first reflection line

The central first reflection line of B '

C ' right-hand member first reflection line

A " left end second time reflected ray

B " central authorities' second time reflected ray

C " right-hand member second time reflected ray

Embodiment

In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and embodiment of the present utility model is described.

Refer to shown in Fig. 1, Fig. 2 and Fig. 3, be respectively light path schematic diagram when side-looking structural representation of the present utility model, using state schematic diagram of the present utility model and the utility model use.As shown in the figure: the utility model is a kind of optical prism module 1, it at least comprises bottom surface 12, collection face 11, minute surface 13 and an output face 14 formed, and this optical prism module 1 is glass or plastic cement material.

The top of optical prism module 1 is located in above-mentioned collection face 11, can be used as the storing district of fingerprint.

This bottom surface 12 is corresponding with collection face 11 and be positioned at the bottom of optical prism module 1, can be used as light source and inputs and the first reflection carrying out light.

This minute surface 13 is located at one end of optical prism module 1, and there is between this minute surface 13 and collection face 11 one first angle 101, and between this minute surface 13 and bottom surface 12, there is one second angle 102, this minute surface 13 can coordinate bottom surface 12 to carry out the second time reflection of light, wherein this first angle 101 can select a suitable obtuse angle on demand, and this second angle 102 can select a suitable angle on demand.

The other end of optical prism module 1 is located in this output face 14, and there is between this output face 14 and collection face 11 one the 3rd angle 103, and there is between this output face 14 and bottom surface 12 one the 4th angle 104, this output face 14 can be used as the background surfaces during reflection of light second time, and be used as light output simultaneously, wherein the 3rd angle 103 can select a suitable acute angle on demand, and the 4th angle 104 can select a suitable angle on demand.

When optical prism module 1 of the present utility model is in time using, a light emitting source 2 and the image sensor 3 of can arranging in pairs or groups uses, and light source 2 is arranged at the position of corresponding bottom surface 12, this image sensor 3 is then arranged at the side of output face 14, and optical prism module 1, light source 2 and image sensor 3 can be closed in a housing (not shown).

And when deployed, the fingerprint that operator can be allowed fingerprint to be placed in collection face 11 is put in district 111, light source 2 is inputted by bottom surface 12 to be irradiated on fingerprint, and the left end incident ray A of left end point a is formed by the light that light source 2 sends by the concave convex texture of fingerprint, the central incident ray B of central point b and the right-hand member incident ray C of right endpoint c and be projeced on bottom surface 12, make left end incident ray A, central authorities incident ray B and right-hand member incident ray C carries out first reflection on bottom surface 12, now bottom surface 12 uses as light face and reflecting surface simultaneously, allow this left end incident ray A again, central authorities incident ray B and right-hand member incident ray C forms the left end first reflection line A ' reflected on minute surface 13 respectively, central authorities first reflection line B ' and right-hand member first reflection line C ', this left end first reflection line A ' afterwards, central authorities first reflection line B ' and right-hand member first reflection line C ' just recycles minute surface 13 and carries out second time reflection as reflecting surface, and then allow this left end first reflection line A ', central authorities first reflection line B ' and right-hand member first reflection line C ' forms the left end second time reflected ray A reflected in output face 14 respectively ", central authorities second time reflected ray B " and right-hand member second time reflected ray C ", so as to allowing this left end second time reflected ray A ", central authorities second time reflected ray B " and right-hand member second time reflected ray C " utilize output face 14 simultaneously as a setting face export, reach the effect that background surfaces is consistent with image imaging surface, make this left end second time reflected ray A ", central authorities second time reflected ray B " and right-hand member second time reflected ray C " receive and then formed a fingermark image by camera lens 31 by image sensor 3, so, the utility model effectively keeps optical path distance by the reflection of at least secondary to reach, and due to the volume of refraction of light path more repeatedly prism can more miniaturization, and the volume of optical prism module can be reduced.

In sum, according to content disclosed above, the utility model really can reach the expection object of utility model, operator can be allowed to be placed on collection face by fingerprint, light source is inputted by bottom surface to be irradiated on fingerprint, and the first reflection carrying out light respectively with bottom surface and minute surface reflects with second time, exported as the background surfaces during reflection of light second time and light by output face afterwards, allow outside image sensor receive light and to form a fingermark image, and reach effective maintenance optical path distance and reduce effect of optical prism modular volume.

The foregoing is only the schematic embodiment of the utility model, and be not used to limit scope of the present utility model.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present utility model and principle and amendment, all should belong to the scope of the utility model protection.And it should be noted that, each ingredient of the present utility model is not limited in above-mentioned overall applicability, the each technical characteristic described in instructions of the present utility model can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, the utility model naturally covers other relevant with this case utility model point and combines and embody rule.

Claims

1. an optical prism module, is characterized in that, this optical prism module comprises:

The one collection face putting district as fingerprint, is located at the top of this optical prism module;

One can carry out the bottom surface of first reflection as light source input to light, corresponding with this collection face and be positioned at the bottom of this optical prism module;

One can coordinate this bottom surface to carry out the minute surface of second time reflection to light, is located at one end of this optical prism module, has the first angle between this minute surface and this collection face, and have the second angle between this minute surface and this bottom surface; And

One as the background surfaces of second time reflection also simultaneously as the output face that light exports, can be located at the other end of this optical prism module, and has the 3rd angle between this output face and this collection face, and have the 4th angle between this output face and this bottom surface.

2. optical prism module as claimed in claim 1, it is characterized in that, this optical prism module is the optical prism module be made up of glass or plastic cement.

3. optical prism module as claimed in claim 1, it is characterized in that, this first angle is obtuse angle.

4. optical prism module as claimed in claim 1, it is characterized in that, the 3rd angle is acute angle.

5. optical prism module as claimed in claim 1, it is characterized in that, this second angle and the 4th angle can select a suitable angle on demand.