Optical imaging module of a thin biometric identification device

Abstract

The invention provides an optical imaging module of a thin type biological identification device. The optical imaging module comprises a first glass substrate, a first optical prism film, a second optical prism film, and an image sensing assembly. The first glass substrate comprises a fingerprint image region, a vein image region, a contact surface, a reflecting surface and a binding surface. The first optical prism film is attached to the binding surface and is located below the fingerprint image region. The second optical prism film is attached under the first optical prism film. The image sensing assembly is arranged corresponding to the first glass substrate and is located at the lower part of the binding surface.

Description

technical field [0001] The invention relates to an optical imaging module of a thin biometric identification device, especially for fingerprint and vein scanning, so as to facilitate the next identification step. Background technique [0002] In order to strengthen the security effect and make up for the shortcomings of traditional digital identification technologies such as personal passwords, digital keys, and hardware keys built into smart chips, etc., more and more identification and security systems are now available. Use or add a biometric device. Fingerprint recognition devices and vein recognition devices are two common examples of biometric devices. [0003] The biggest problem facing the dual biometric identification module at present is still the integration of hardware. The past practice is to configure appropriate sensors for different detection targets. For the dual identification module of fingerprint and vein, it is necessary to set up an image for vein imag...

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Problems solved by technology

[0004] Therefore, in terms of volume, the angle of view (optical path) to observe the two images is different. In addition, the configuration of the traditional fingerprint prism will lead to a larger module size; moreover, the capacitive fingerprint sensor is used as mentioned above. Although the purpose of size reduction can be achieved, the following problems will arise when end users use it in the future: (1) The problem of component reliability is more suitable for the application of capacitive sensors under one-to-one (personal) use, but if In a one-to-many comparison environment (building access control and attendance system), its durability has been tested

(2) The use of capacitive fingerprint sensors will further increase the price of the overall module

[0007] The fingerprint optical imaging module (FUSE-ID) of another manufacturer, M2SYS, is a combination of an integrated optical imaging module and a fingerprint module on the hardware, so that the entire module size reaches 100mm*120mm*74mm, the overall volume is relatively large, and the There are two image sensors in the system, and it is also necessary to take images of fingerprints and veins in sequence, making the image taking time relatively long

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