Micro-optical fingerprint sensor and method for imaging fingerprint
A fingerprint sensor and image sensor technology, which is applied in optics, optical components, instruments, etc., can solve the problems of large sensor components, degraded grating optical fingerprint image quality, and increased cost, so as to reduce the volume size and optimize and streamline the manufacturing process. Effect
Inactive Publication Date: 2005-05-25
交通控股有限公司
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] According to the above-mentioned optical path characteristics, the current optical fingerprint sensor has the following disadvantages: ①The sensor component is bulky, which limits its application range; Limitation; ③The fingerprint image collected by the sensor is compressed along one direction, and the compression coefficient is an irrational number (the square root of 2), which forces it to be corrected by software, which also increases its cost and limits its application
The disadvantage of this solution is that the quality of the fingerprint image is severely degraded due to optical imperfections of the grating
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0049] figure 2 The optical path through the optical fingerprint sensor assembly 100 of the present invention is shown. In a preferred embodiment of the present invention, the optical fingerprint sensor assembly is composed of: a printed circuit board 110, a light source 120, a scattering mirror 130, a rectangular prism 140, a collimating lens 150, a first mirror 160, A second mirror 170 , a third mirror 180 , an imaging mirror 190 , and an image sensor 200 .
[0050] Light is emitted from a light source 120 mounted on the printed circuit board 110, which may be composed of a group of light emitting diodes. The light is then redirected when it reaches the diffuser mirror 130 and produces light that is directed toward the vertical prism 140 in unison.
[0051] The light entering the rectangular prism 140 reaches the upper surface of the rectangular prism 140, that is, the surface on which the finger is placed. In a preferred embodiment of the present invention, the upper su...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to an optical fingerprint sensor for collecting fingerprint images. In the example of the present invention, the optical fingerprint sensor includes: ① a light source mounted on a printed circuit board; ② a diffuser to receive light emitted from the light source; ③ a rectangular prism to receive light from the diffuser; ④ a The collimator lens receives the light from the prism; ⑤The first mirror receives the light from the collimator lens; ⑥The second mirror receives the light from the first mirror; ⑦The third mirror receives the light from the second mirror ⑧An imaging mirror receives the light coming out of the third mirror; ⑨An image sensor mounted on the same printed circuit board as the light source receives the light coming out of the imaging mirror.
Description
technical field [0001] The invention relates to a general fingerprint collection device, in particular to an optical fingerprint collection system. Background technique [0002] Existing optical fingerprint sensors usually use a rectangular prism to collect fingerprints. Its optical path features such as figure 1 As shown, the parallel light emitted from the light source 11 passes through one surface of the rectangular prism 12, and then reaches the upper surface of the prism, that is, the surface on which the finger 13 is placed. If the light beam arrives at a position other than the upper surface of the prism touched by the finger, the light beam will form total internal reflection, pass through the other side of the prism 12, and then reach the image sensor 14 perpendicular thereto. In other words, if the light beam arrives at the upper surface of the prism 12 where the finger 13 is placed, the light beam will not form total internal reflection, and part of it will be a...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V40/1324
Inventor 冯琛
Owner 交通控股有限公司