CN2548559Y

CN2548559Y - Active fingerprint collecting plate

Info

Publication number: CN2548559Y
Application number: CN02224720U
Authority: CN
Inventors: 王文江
Original assignee: Xi'an Qingsong Tech Co Ltd
Current assignee: Xi'an Qingsong Tech Co Ltd
Priority date: 2002-04-05
Filing date: 2002-04-05
Publication date: 2003-05-07
Anticipated expiration: 2012-04-05

Abstract

The utility model relates to a living fingerprint collecting plate, which is small in size, easy in assembly, good in consistency, and low in cost. The collecting plate of the utility model is a multi-V prism, one side of the prism is the contact surface of the living fingerprint, the other side has multiple continuous V-shaped grooves.

Description

The living body finger print acquisition plate

This utility model relates to a kind of living body finger print acquisition device, especially relates to a kind of living body finger print acquisition plate.

In the background technology, living body finger print acquisition mainly adopts the collection of optics live body at present, promptly adopts glass prism to carry out the collection of optics live body.Directional light impinges upon a prismatical side, can produce total reflection on principal plane.When finger when being placed on principal plane, the jut of fingerprint contacts with principal plane, has changed the refractive index of light, thereby does not produce total reflection at contact position.And the groove of finger is owing to still produce total reflection with principal plane is contactless, thereby making groove and projection produce light and shade at prismatical opposite side changes, and realizes living body finger print acquisition.The shortcoming of this acquisition method is: volume is big, and cost is higher, and concordance is poor, and assembling is complicated.

The purpose of this utility model has been to overcome the weak point in the above-mentioned background technology, and a kind of living body finger print acquisition plate is provided, and its volume is little, easily assembling, and high conformity, cost is low.

For achieving the above object, the technical solution that this utility model adopts is as follows:

A kind of living body finger print acquisition plate, its special character is: described collection plate is many V prism, and prism one side is the contact surface of living body finger print, and opposite side is a plurality of successive " V " connected in star.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is user mode figure of the present utility model.

Below in conjunction with accompanying drawing this utility model is described in further detail: referring to Fig. 1, Fig. 2, this utility model adopts many V prism as harvester, and prism simultaneously is the contact surface 1 of living body finger print, and another side is " V " connected in star 2 of a plurality of connections.Light source 3 becomes the one side that directional light 5 impinges upon prism band " V " connected in star by astigmatism plate 4, in the time of above the nothing finger is placed on the contact surface 1, produces total reflection on contact surface 1.When finger when being placed on the contact surface 1, the jut of fingerprint contacts with contact surface 1, has changed the refractive index of light, thereby does not produce total reflection at contact position.And the groove of finger is owing to still produce total reflection with contact surface 1 is contactless, changes thereby make groove and projection produce light and shade at the opposite side of prism contact surface, realizes living body finger print acquisition.This utility model adopts many V prism to replace existing glass prism, and its acquisition principle remains groove and projection produces the light and shade variation at the prismatical opposite side of many V.Glass prism is owing to the requirement of its surface optical characteristic can only form with the optics glass processing, and many V prism can use materials such as lucite, PVC, and these raw materials are suitable for Mould Machining, thereby for guaranteeing that concordance and large-scale production lay the first stone.In addition, many V prism thickness is much smaller than glass prism, thereby reserves bigger space for follow-up light path design, and overall volume is dwindled significantly.

Compared with prior art, the advantage and the effect that the utlity model has are as follows:

1. the utility model is simple in structure, and good manufacturability owing to its volume significantly dwindles, thereby is follow-up Light path design is reserved bigger space, and simultaneously assembling easily, and is easy to maintenance.

2. the utility model raw material drawing scope is wide, can use the materials such as lucite, PVC, these Material is suitable for Mould Machining, thereby cost is low, high conformity.

Claims

1. living body finger print acquisition plate, it is characterized in that: described collection plate is many V prism, and prism one side is the contact surface (1) of living body finger print, and opposite side is a plurality of successive " V " connected in stars (2).