Iris recognition and photographing combined photographing module based on partition dual-pass optical filter

A camera module and iris recognition technology, which is applied in the field of optical filters, can solve the problems of increased module size and thickness, poor durability and reliability, and is not conducive to the thinning and miniaturization of mobile phones, so as to achieve compatibility High, high reliability and reliability, easy miniaturization effect

CN106454049AActive Publication Date: 2017-02-22WUXI HAOBANG HIGH TECH CO LTD
6 Cites 25 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-02-22

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an iris recognition and photographing combined photographing module based on a partition dual-pass optical filter. Optical filters capable of passing visible light (stopping infrared light) and transmitting the infrared light (stopping the visible light) are arranged between a lens light through hole and a photosensitive imaging chip of the photographing module, so light received on the photosensitive imaging chip is divided into a visible light area and an infrared light area, thereby realizing the iris recognition and photographing function combined photographing module. According to the module, the optical filter is formed by splicing a visible light transmitting (infrared light stopping) optical filter and an infrared light transmitting (visible light stopping) optical fiber, thereby forming the partition dual-pass optical filter, and the splicing part is processed to avoid light leakage.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the technical field of camera modules, in particular to a filter that is formed by splicing a visible light pass (infrared light cut off) filter and an infrared light pass (visible light cut off) filter to form sub-regional dual channels. Background technique

[0002] Natural light is composed of visible light and infrared light, which are located in different wavelength bands. Iris recognition is to reflect infrared light through the iris of the pupil. The camera captures the reflected infrared light to form a picture containing iris texture details. If there is visible light when the camera captures infrared light, the visible light will weaken the iris texture details and fail to meet the recognition requirements. The iris recognition module needs to install a filter that cuts off visible light and passes through infrared light to process the light. Ordinary photography is to capture the visible light reflected by t...

Examples

Embodiment Construction

[0025] The present invention will be specifically described below in conjunction with the accompanying drawings.

[0026] Such as image 3 As shown, the present invention provides a two-in-one camera module for iris recognition and photography based on a partitioned double-pass filter. A splicing filter is mounted at the position where the camera module is equipped with filter 1, that is, the visible light The cut-off filter 2 (through infrared light) and the infrared cut-off filter 3 (through visible light) are spliced ​​together.

[0027] Wherein the visible light cut-off filter 2 can pass light with a wavelength of 810-920nm, such as Figure 6 shown. Infrared cut-off filter 3 is white glass, blue glass or blue coating (Blue coating) glass; its half wavelength is 650 ± 10nm, and the main imaging light band is between 360-650nm; after 650nm, the light transmittance decreases step by step Half, reaching 0 near 710nm, such as Figure 5 shown. The thicknesses of the visible...