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Thin type aspheric surface fingerprint collecting prism and collecting device

A technology of fingerprint collection and aspheric lens, which is applied in the direction of instruments, character and pattern recognition, computer components, etc. It can solve the problems that the fingerprint collector is too large to be embedded in fingerprint products, and the space limitation of the fingerprint collector is limited, so as to improve the resolution of details Capacity, height reduction, effect of volume reduction

Inactive Publication Date: 2014-08-13
CHANGCHUN HONGDA OPTOELECTRONICS & BIOSTATISTICS IDENTIFICATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a thin aspheric fingerprint collection prism, the collection prism adopts a double-slope design structure, and the overall thickness of the collection device is only 13 mm, which solves the problem that the existing fingerprint collection devices using isosceles right-angle prisms are too large to be embedded in fingerprint products lack of
[0004] The present invention further provides a thin aspherical fingerprint collection device, which solves the problem that the fingerprint collection device is limited by space in product application, and is convenient for embedded installation and portability

Method used

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  • Thin type aspheric surface fingerprint collecting prism and collecting device
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  • Thin type aspheric surface fingerprint collecting prism and collecting device

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Embodiment 1

[0020] according to Figure 3~Figure 5 As shown, the structure of the fingerprint collection prism 1 provided by the present invention includes: a fingerprint collection surface 1.1 and a reflective surface 1.2 parallel up and down, an imaging surface 1.3 and a light-transmitting surface 1.4 at the front and rear ends, and side reflective surfaces 1.6 on both sides (see Figure 5 ), the thickness is 7.5mm, the length is 30mm, and the width is 25mm; among them, the imaging surface 1.4 is a 75-degree slope, and the 75-degree slope is coated with a metal reflective film for light reflection; the reflection surface 1.2 at the bottom and the side reflection surface 1.6 are set 2 sloped reflectors 1.5 with 65° chamfers (see Figure 4 ), guide the led light into the collection surface; the fingerprint collection prism 1 is made of K9 glass, the refractive index=1.51630, the dispersion=0.00806, and the Abbe number=64.06.

Embodiment 2

[0022] according to figure 2 As shown, the device of the present invention is mainly composed of a housing 7, a light source (green bright LED) 8, a control circuit system 6 and a fingerprint collection optical system; Set fingerprint collection prism 1, diaphragm (diameter 1mm) 2, aspheric lens (produced by Taiwan Yiguang) 3, reflector 4; light source 8 adopts green bright LED as the lighting device of the device of the present invention and is fixed on the fingerprint collection prism 1 The control circuit system 6 is connected with the light source 8 to control its work; the aspheric lens 3 is located on the right side of the fingerprint collection prism 1, its optical axis coincides with the imaging optical axis of the fingerprint collection prism 1, and the reflector 4 is located on the right side of the aspheric lens 3 , the centers of the fingerprint collection prism 1, the aspheric lens 3, and the mirror 4 are located on the same optical axis, the light is reflected b...

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Abstract

The invention discloses a thin type aspheric surface fingerprint collecting prism and a collecting device. The collecting device is mainly composed of a shell, a light source, a control circuit system and a fingerprint collecting optical system. The fingerprint collecting prism, a diaphragm, an aspheric surface lens and a reflector are distributed along a light path. The light source is fixed below the fingerprint collecting prism. The control circuit system is connected with the light source. The aspheric surface lens is located at the right side of the fingerprint collecting prism, the optical axis of the aspheric surface lens coincides with the imaging optical axis of the fingerprint collecting prism, and the reflector is located at the right side of the aspheric surface lens. Light rays are reflected through the reflector, and an image reaches a CMOS fingerprint collecting circuit. The structure of a 75-degree inclined plane imaging plane and two 65-degree inclined reflecting faces is adopted in the fingerprint collecting prism in the fingerprint collecting optical system so that the path of the light rays in the horizontal direction can be lengthened and the path of the light rays in the vertical direction can be shortened. The height of the fingerprint collecting optical system can be greatly reduced, the size of the fingerprint collecting device is reduced, and the fingerprint collecting device can be embedded into fingerprint composite devices such as an embedded handheld machine, a verification device and a fingerprint and iris integrated machine. The problem that collecting instrument products are limited by space in application is solved, and embedded installation and carrying are convenient.

Description

technical field [0001] The invention discloses a thin aspherical fingerprint collection prism, and provides a collection device using the thin aspherical fingerprint collection prism, which belongs to the technical field of living fingerprint collection devices. Background technique [0002] At present, there are many kinds of single-finger fingerprint collectors and fingerprint modules in the domestic and foreign markets. The collectors are generally placed on a desk and used independently, and the fingerprint modules are generally matched with fingerprint door locks. But there is a problem, relatively large size. Smaller single-finger collection devices that are common in domestic and foreign markets generally use isosceles right-angle prisms as fingerprint collection prisms, and the volume is generally 21mm*25mm*61.5mm, such as figure 1 shown. When many handheld verification devices and fingerprint door locks, fingerprint bags, fingerprint safes and other products need ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 王莉王佳楠胡绘珠何笛张炜明吴玉宽张立平
Owner CHANGCHUN HONGDA OPTOELECTRONICS & BIOSTATISTICS IDENTIFICATION TECH
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