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Image acquisition device

A technology of image acquisition device and components, which is applied in the direction of printing image acquisition, equipment, character and pattern recognition, etc., which can solve the problem that the photoelectric sensor cannot be reached, and achieve the effect of preventing secondary total reflection

Pending Publication Date: 2020-11-17
SHANGHAI HARVEST INTELLIGENCE TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0006] However, in the optical under-screen fingerprint scheme based on the principle of optical total reflection, there must be no air gap between the photoelectric sensor and the lighting source, otherwise, the signal light carrying fingerprint information will undergo secondary total reflection and cannot reach the photoelectric sensor.

Method used

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  • Image acquisition device

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Embodiment Construction

[0021] As mentioned in the background technology, there are many defects in the existing fingerprint recognition device under the optical screen. Fingerprint imaging quality.

[0022] Specifically, in the existing fingerprint recognition device under the optical screen based on the principle of total reflection, optical glue with the same refractive index is filled between the light source part and the sensor part to ensure that incident light does not reflect when it reaches the light source part.

[0023] However, in the manufacturing process, limited by the process, it is difficult to attach large-area sensors, and the optical glue may not completely fill all the gaps between the light source part and the sensor part. For example, if an air bubble is formed between the light source part and the sensor part, the incident light will be totally reflected at the position of the air bubble, so that this part of the incident light cannot successfully reach the sensor part, result...

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Abstract

An image acquisition device comprises a light-transmitting cover plate, the light-transmitting cover plate is provided with a first surface and a second surface which are opposite to each other alongthe thickness direction, and the first surface of the light-transmitting cover plate is suitable for being contacted with an object to be acquired; the device also comprises a light source part provided with a first surface and a second surface which are opposite to each other in the thickness direction, wherein the first surface of the light source part is arranged towards the second surface of the light-transmitting cover plate; the device further comprises a sensor part provided on a second surface of the light source part; a scattering layer coated on the second surface of the light sourcepart and is suitable for scattering incident light. Through the scheme provided by the invention, secondary total reflection can be effectively prevented, and signal light can be successfully incident to the sensor part.

Description

technical field [0001] The present invention relates to the technical field of image acquisition, in particular to an image acquisition device. Background technique [0002] With the development of information technology, biometric identification technology is playing an increasingly important role in ensuring information security. Among them, fingerprint identification has become one of the key technical means for identification and device unlocking widely used in the mobile Internet field. [0003] Under the trend of increasing screen-to-body ratio of smart devices, traditional capacitive fingerprint recognition technology can no longer meet the demand, while ultrasonic fingerprint recognition technology has problems in terms of technology maturity and cost. Therefore, optical fingerprint recognition technology It is expected to become the mainstream technical solution of fingerprint recognition. [0004] Existing optical fingerprint recognition schemes are based on the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/20
CPCG06V40/1324G06V40/1318G06V10/145G06V10/147
Inventor 黄建东
Owner SHANGHAI HARVEST INTELLIGENCE TECH CO LTD
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