CN205068440U

CN205068440U - Changeable optical fingerprint collection equipment of background illumination colour

Info

Publication number: CN205068440U
Application number: CN201520816891.8U
Authority: CN
Inventors: 裴育
Original assignee: HANGZHOU ZHIAN TECHNOLOGY Co Ltd
Current assignee: HANGZHOU ZHIAN TECHNOLOGY Co Ltd
Priority date: 2015-10-20
Filing date: 2015-10-20
Publication date: 2016-03-02
Anticipated expiration: 2025-10-20

Abstract

The utility model discloses a changeable optical fingerprint collection equipment of background illumination colour, including background light source, prism, imaging lens and CMOS device, it corrects the lens to be equipped with the lighting between background light source and the prism, be equipped with focus compensation lens between prism and the imaging lens. The beneficial effects of the utility model are that: the introduction of " focus compensation lens " is reached through " lighting correction lens ", when bias light colour (frequency) when changing, the significant change can not take place for the lighting scope of its bias light and the focus of formation of image, make the optical fingerprint collector can conveniently alternate background LED's illumination light colour, not only can satisfy the special partiality of different users to the illumination colour, and the characteristics of fingerprint formation of image under can the make full use of different illumination fingerprint image that obtains better quality like, promote user's use impression.

Description

The optical ftngetpnnt acquisidon equipment that background lighting color is variable

Technical field

The utility model belongs to optical ftngetpnnt acquisidon technical field, more particularly, relates to the optical ftngetpnnt acquisidon equipment that a kind of background lighting color is variable.

Background technology

Optical ftngetpnnt acquisidon equipment is the important component part of fingerprint recognition system.In recent years, along with deepening continuously of fingerprint recognition system scheme application, the consumption of optical ftngetpnnt acquisidon equipment also increased year by year.At present, optical ftngetpnnt acquisidon equipment is widely used at the numerous areas such as fingerprint access control, fingerprint attendance.The Ambient light color of optical capturing equipment is an important component part of its selling point.This is because on the one hand, the bias light of different colours can obtain different collection effects.Such as, red background light has good imaging effect to dry finger, and blue background light has good imaging effect to wet finger; On the other hand, user, under different application scenarioss, can have special preference to the bias light of a certain color.Such as, in general fingerprint access control user comparatively favors blue background light ratio, this is because blueness has stronger science and technology sense; On the contrary, important events gate inhibition user then compares and tends to red background light, this is because redness has stronger warning function.

If the background colour of optical ftngetpnnt acquisidon equipment is variable, not only can meet the use preference of different field user, and the fingerprint imaging feature under different colours illumination that can make full use of optimizes the recognition effect of fingerprint.But optical ftngetpnnt acquisidon equipment common on market mostly adopts the background illumination of solid color and does not adopt the background illumination of Multicolor variable.Possesses the optical ftngetpnnt acquisidon equipment of colour change function once in a while, the effect of its variable color light also only plays decoration function, its real collection fingerprint background colour remains single, show decoration look when namely not gathering fingerprint, and need to be switched to fixing solid color bias light when gathering fingerprint.Traditional optical ftngetpnnt acquisidon equipment must adopt single its main cause of fixing background colour as follows:

1, different colours light causes bias light distributional difference:

The bias light of different colours, its light frequency is different, to such an extent as to after injecting prism, astigmatism distribution is different, cause background illumination patterns difference under different colours, and this species diversity brings very large difficulty to follow-up fingerprint imaging and subsequent treatment;

2, different colours light causes focal length difference:

Its frequency of different colours light is different, and after prism and lens combination, its focal length is different.But optical fingerprint collector is all fixed focal length system, cannot take into account the imaging focal length of different colours light.

3, the fingerprint image feature of different colours light collection is different, is difficult to take unified CMOS parameter to obtain qualified fingerprint image.

Utility model content

The purpose of this utility model overcomes the deficiencies in the prior art, provides a kind of rational in infrastructure, meet the preference of different user to background colour, expand the optical ftngetpnnt acquisidon equipment that the background lighting color of application range of products is variable.

The optical ftngetpnnt acquisidon equipment that this background lighting color is variable, comprises background light source, prism, imaging len and cmos device, is provided with lighting correcting lens between described background light source and prism, is provided with focal length and compensates eyeglass between described prism and imaging len.

The beneficial effects of the utility model are:

By the introducing of " lighting correcting lens " and " focal length compensation eyeglass ", when Ambient light color (frequency) changes, all can not there is significant change in the cloth optical range of its bias light and the focal length of imaging, make optical fingerprint collector can the illumination light color of changing background LED easily, not only can meet the special preferences of different user to illuminating color, and the feature of fingerprint imaging under different light that can make full use of obtains the fingerprint image of more good quality, the use sense promoting user is subject to.

Accompanying drawing explanation

Fig. 1 is the utility model device structure schematic diagram;

Fig. 2 is lighting correcting lens structure and working principle figure;

Fig. 3 is the structure and working principle that focal length compensates eyeglass;

Fig. 4 is prism structure schematic diagram in embodiment;

Fig. 5 is lighting correcting lens structural representation in embodiment;

Fig. 6 is embodiment mid-focal length compensating glass chip architecture schematic diagram;

Description of reference numerals: background light source 1, prism 2, imaging len 3, cmos device 4, lighting correcting lens 5, focal length compensate eyeglass 6.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described further.Although the utility model will be described in conjunction with preferred embodiment, should know, not represent the utility model restriction in the described embodiment.On the contrary, the utility model will contain can be included in attached claims limit scope of the present utility model in alternative, modified and equivalent.

The utility model devises " lighting correcting lens 5 " and " focal length compensates eyeglass 6 ", and is introduced in traditional optical fingerprint sensor.Efficiently solve the problem that conventional optical fingerprint collector cannot use multi-colored led background light source.Its global design structure as shown in Figure 1.

The structure of " lighting correcting lens 5 " and effect:

The effect of lighting correcting lens 5 is before bias light incides prism and refraction skew occurs, and light is carried out refraction skew in advance to the opposite direction of skew.Incident bias light skew is in the prism larger, the oppositely pre-refraction angle obtained in lighting correcting lens 5 is in advance larger, the skew that such bias light frequency change causes in the prism will be corrected in advance in lighting correcting lens 5, finally ensures that larger skew can not occur cloth optical range.Its structure and principle are as shown in Figure 2.The blue ray that frequency is higher offsets greater angle in the opposite direction in lighting correcting lens 5; Blue ray deviation angle in prism 2 that frequency is higher is larger, but owing to experienced by the reverse wide-angle deviation of lighting correcting lens 5 in advance, the cloth luminous point that it is irradiated to is consistent with ruddiness.

The structure of " focal length compensates eyeglass 6 " and effect:

It is that its effect allows light slightly disperse in advance, and then pool picture with the original incompatible eyeglass of condenser lens that focal length compensates eyeglass 6.If incident light frequency changes, incident light is to collect the extent of refraction occurred in lens larger, and compensate at focal length the compensation that eyeglass 6 obtains more, focal position last so almost remains unchanged.Its structure and principle are as shown in Figure 3.The blue ray that frequency is higher compensates through focal length the reverse deviation that eyeglass 6 has carried out greater angle in advance; The blue ray deviation angle that imaging len 3 pairs of frequencies are very high is larger, but compensates the reverse refraction of eyeglass 6 owing to have passed through focal length in advance, and its focal position is identical with the focal position of red light.

Embodiment of the present utility model:

By adopting know-why of the present utility model, the BGR three-color LED that LED adopts centre wavelength to be respectively 430nm/520nm/625nm is background light source 1.The present embodiment is only and illustrates design concept.The key Design data that this embodiment is mentioned are also within the scope of patent protection of this application, but these concrete data do not represent the know-why itself described in this patent, and are only considered as a kind of avatar of know-why.

The present embodiment, the designing points of light channel structure is as follows:

Prism 2 adopts K9 glass material, and structured data as shown in Figure 4.

Lighting correcting lens 5 adopts PMMA material, and structure is irregular surface, and its tangent line horizontal sextant angle 8 point sampling value is: 0.00,4.21,11.78,20.33,31.23,45.00,66.39,89.99.As shown in Figure 5.

Background light source 1 (controllable multi-color light source) adopts centre wavelength to be respectively the BGR three-color LED of 430nm/520nm/625nm.

Focal length compensates eyeglass 6 and adopts ZF6 glass material, and curved surface specification is R8.As shown in Figure 6.

Imaging len 3 adopts K9 glass material, and curved surface specification is R11.5.

Cmos device 4 specification is 1/6INCH, 30 everything elements.

Cmos device 4: refer to the image acquisition device adopting CMOS technology.

Claims

1. the optical ftngetpnnt acquisidon equipment that a background lighting color is variable, comprise background light source (1), prism (2), imaging len (3) and cmos device (4), it is characterized in that: between described background light source (1) and prism (2), be provided with lighting correcting lens (5), be provided with focal length between described prism (2) and imaging len (3) and compensate eyeglass (6).