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Thin optical fingerprint scanner

A fingerprint collector, optical technology, applied in the direction of optics, optical components, instruments, etc., can solve the problems of inconvenient installation, affecting the range of use, large volume of the fingerprint collector, etc., and achieve the effect of changing the optical path

Inactive Publication Date: 2015-03-04
深圳指瑞威科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wherein the slope 11 of the right angle prism 1 is the collection surface of the fingerprint, when the finger is pressed on the slope 11 of the right angle prism, according to the principle of optical reflection, the light path turns along the right angle, and the right angle 13 is the outgoing direction of the light, the lens group 3 and the imaging Surface 4 needs to be arranged in this direction in turn, and then other devices are arranged in this direction. Therefore, the fingerprint collectors adopting the above-mentioned optical system are relatively large in size, and it is inconvenient to install in places where the installation space is limited, which affects the scope of use. For example, Not suitable for use with mouse, door lock, USB flash drive, mobile phone and other equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, a thin optical fingerprint collector includes: a housing 1, a collecting prism 2, a light source 3, a reflective surface 4, an integrated imaging device 5, and a circuit board 6.

[0018] The collection prism 2 includes at least an incident surface 21, a collection surface 22, a total reflection surface 23, and an exit surface 24, wherein the incident surface 21 and the collection surface 22 form an included angle θ, and the included angle θ makes the light emitted by the light source 3 enter the collection prism After 2 the angle β emitted from the incident surface 21 is smaller than the total reflection angle, and the angle α at which the light reaches the collection surface 22 is greater than the total reflection angle, so that the light can be totally reflected on the collection surface 22. The total reflection surface 23 is parallel to the collection surface 22. The total reflection function of the total reflection surface 23 can be realized...

Embodiment 2

[0021] Such as figure 2 As shown, a thin optical fingerprint collector includes: a housing 1, a collecting prism 2, a light source 3, a reflective surface 4, an integrated imaging device 5, and a circuit board 6.

[0022] The collection prism 2 includes at least an incident surface 21, a collection surface 22, a total reflection surface 23, and an exit surface 24, wherein the incident surface 21 is parallel to the collection surface 22 so that there is no light above the total reflection angle emitted from the light source 3 on the collection surface 22 The total reflection surface 23 is parallel to the collection surface 22, and the total reflection function of the total reflection surface 23 can be realized according to the material of the collection prism 2 or the design of the angle between each surface, or the reflection film can be directly coated on the total reflection surface 23 (Such as aluminum film) to achieve the required total reflection effect. The light source 3...

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PUM

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Abstract

The invention provides a thin optical fingerprint scanner, comprising a shell, a scanning prism, a light source, a reflector, an integrated imaging device and a circuit board. The scanner is characterized in that the scanning prism, the light source, the reflector, the integrated imaging device and the circuit board are installed in the shell, wherein the scanning prism at least comprises an entering surface, a scanning surface, a totally reflecting surface and an exiting surface; the scanning surface is parallel with the totally reflecting surface; the rays emitted by the light source enter from the entering surface of the scanning prism, undergo total reflection on the totally reflecting surface after being reflected by the scanning surface and then exist from the exiting surface; and the exiting rays are totally reflected to the integrated imaging device by the reflector to form fingerprint images. The light path is folded through light path reflection and refraction, thus changing the light path length to ensure the scanner to be thinner.

Description

Technical field [0001] The invention relates to an optical fingerprint collector, in particular to a thin optical fingerprint collector. Background technique [0002] The optical fingerprint collector is a fingerprint collector widely used in existing fingerprint identification systems. It collects and images the surface texture of the finger through an optical sensor based on the principle of optical imaging. Traditional optical fingerprint collectors usually use right-angle prisms or polygonal prisms, such as attached image 3 As shown, the optical fingerprint collector using a right-angle prism is composed of a right-angle prism 1, a light source 2, a lens 3, and an imaging surface 4. The oblique surface 11 of the right-angle prism 1 is the fingerprint collection surface. When a finger presses the oblique surface 11 of the right-angle prism, according to the principle of optical reflection, the light path turns along the right-angle surface. The right-angle surface 13 is the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/20G02B17/08
Inventor 李扬渊王卉芳
Owner 深圳指瑞威科技有限公司