CN201000629Y

CN201000629Y - Fingerprint identification device

Info

Publication number: CN201000629Y
Application number: CNU2007200477266U
Authority: CN
Inventors: 闵瑜
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-19
Filing date: 2007-01-19
Publication date: 2008-01-02
Anticipated expiration: 2017-01-19

Abstract

The utility model relates to an optics fingerprint identification device, which comprises a prism (1), a frame body component (2), a lens group (3), a CMOS image sensor (4), and a light source (5); wherein the included angle between the fingerprint gathering surface (13) and the emergence surface (12) of the prism (1) is 67 plus or minus 3 degree, and the included angle between the fingerprint gathering surface (13) and a surface (14) is 55 degree; the prism (1), the light source (5), the lens group (3), and the CMOS image sensor (4) are arranged in the frame body component (2) in order, the CMOS image sensor (4) is arranged slantways, and an image formation surface coincides with a target surface. Through the light refraction and reflection function of the prism, a fingerprint image is formed to be an image to the CMOS image sensor through the lenses, thus the fingerprint identification can be performed.

Description

Fingerprint identification device

Technical field

The utility model belongs to optical technical field, particularly a kind of fingerprint identifying optical system.

Background technology

Continuous development along with science and technology, the identification of personal identification is also more important, fingerprint has uniqueness and unchangeability, fingerprint identification technology is easy to use, safe and reliable, be widely used in all trades and professions, as fingerprint gate lock, fingerprint gate guard control system, ecommerce, bank savings, social insurance etc.Optical fingerprint acquisition instrument of the prior art adopts the increase optical element to come the correcting image distortion more, its structure more complicated, and volume is bigger.

Summary of the invention

The purpose of this utility model provides a kind of novel optical finger print recognition device, and volume is little, and is simple in structure, easy to use, and production cost is low.

In order to achieve the above object, the technical solution of the utility model is as follows:

A kind of optical finger print recognition device comprises prism 1, frame assembly 2, lens combination 3, cmos image sensor 4, light source 5; Wherein the angle of the fingerprint collecting face 13 of prism 1 and exit facet 12 is 67 ± 3 °, and fingerprint collecting face 13 is 55 ° with the angle of face 14; Prism 1, light source 5, lens combination 3, cmos image sensor 4 place frame assembly 2 successively, and cmos image sensor 4 tilts to place, and imaging surface and target surface coincide.

Owing to adopted said structure, can fingerprint image be imaged onto on the cmos image sensor through lens combination, thereby carry out fingerprint recognition by the refraction and the reflex of 1 pair of light of prism.

Description of drawings

Fig. 1 is the utility model perspective view;

Fig. 2 is the prism synoptic diagram;

Fig. 3 is the utility model assembling synoptic diagram;

Fig. 4 is the utility model index path.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail:

A kind of optical finger print recognition device comprises prism 1, frame assembly 2, lens combination 3, cmos image sensor 4, light source 5; As shown in Figure 2, the fingerprint collecting face 13 of prism 1 and the angle of exit facet 12 are 674 ± 3 °, and fingerprint collecting face 13 is 55 ° with the angle of face 14; As shown in Figure 3, prism 1, light source 5, lens combination 3, cmos image sensor 4 place frame assembly 2 successively.Light source 5 is positioned at 11 of prism 1, tested finger is pressed on the fingerprint collecting face 13 of prism 1, because finger print is raised in finger surface, fingerprint closely contacts with the fingerprint collecting face 13 of prism 1, has destroyed the condition of total reflection, and a part of incident light will be lost by finger, remaining part light reflection, go out from exit facet 12 transmissions of prism 1, lens combination 3 to cmos image sensor 4, and is shown as the low light level with the photoimaging of each point reflection on the fingerprint.And the recess between the fingerprint projection, total reflection can take place in incident light, so the each point of recess is shown as high light on cmos image sensor 4, like this, the catoptrical power of tested finger surface each point from cmos image sensor 4 shows just can obtain fingerprint lines clearly.

As shown in Figure 4, because finger print is off plumb by the virtual image face that become in the prism 1 with optical axis, scioptics group 3 back imagings also with the optical axis out of plumb, cmos image sensor 4 is tilted to place, and the target surface and the image planes that transfer to cmos image sensor 4 coincide, and reduce image fault.

Claims

1, a kind of optical finger print recognition device is characterized in that: comprise prism (1), frame assembly (2), lens combination (3), cmos image sensor (4), light source (5); Prism (1), light source (5), lens combination (3), cmos image sensor (4) place frame assembly (2) successively.

2, optical finger print recognition device according to claim 1 is characterized in that the fingerprint collecting face (13) of described prism (1) and the angle of exit facet (12) are 67 ± 3 °, and fingerprint collecting face (13) is 55 ° with the angle of face (14).

3, optical finger print recognition device according to claim 1 is characterized in that described cmos image sensor (4) tilt to place, and imaging surface and target surface coincide.