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Lens system, optical fingerprint identification device and terminal equipment

A technology for fingerprint identification and terminal equipment, which is applied in the field of optical imaging and can solve the problems that restrict the development of thin and light mobile phones and the large size.

Active Publication Date: 2021-12-10
딕스테크이노베이션피티이리미티드
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the increasing diversification and specialization of mobile phone functions, various mobile phone functional modules have an increasing demand for the internal space of mobile phones. The existing optical fingerprint The size of the identification module in the direction perpendicular to the display screen is relatively large, which restricts the development of thinner and lighter mobile phones

Method used

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  • Lens system, optical fingerprint identification device and terminal equipment
  • Lens system, optical fingerprint identification device and terminal equipment
  • Lens system, optical fingerprint identification device and terminal equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] In Embodiment 1 to Embodiment 4, the lens system includes three groups of lenses and diaphragms, Figure 4 , Figure 8 , Figure 12 with Figure 16 Four layouts (layouts) of the lens system of Embodiment 1 to Embodiment 4 are respectively shown. In the four layouts, from the object side to the image side, there are arranged in sequence: a display screen 20, a first lens 21, a diaphragm , the second lens 22 , the third lens 23 .

[0095] Wherein, the first lens 21, the second lens 22 and the third lens 23 respectively correspond to figure 2 The first lens 11, the second lens 12 and the third lens 13 described in, that is, the first lens 21 is a lens with negative refractive power, the radius of curvature of the object side of the first lens is a negative value, and the The radius of curvature of the image side of the first lens is a positive value, that is, the first lens is a lens with biconcave negative power, the second lens 22 is a lens with positive power, and ...

Embodiment 2

[0117] In Example 2, refer to Figure 8 , from the object side to the image side are arranged in sequence: a display screen 20 , a first lens 21 , a diaphragm, a second lens 22 , and a third lens 23 .

[0118] Wherein, the first lens 21, the second lens 22 and the third lens 23 respectively correspond to figure 2 The first lens 11, the second lens 12 and the third lens 13 described in, that is, the first lens 21 is a lens with negative refractive power, and the radius of curvature of the object side of the first lens is a negative value, and the The radius of curvature of the image side of the first lens is a positive value, that is, the first lens is a lens with biconcave negative power, the second lens 22 is a lens with positive power, and the object side of the second lens is The radius of curvature is a positive value, and the radius of curvature of the image side of the second lens is a negative value, that is, the second lens 22 is a lens with a biconvex positive refra...

Embodiment 3

[0141] In Example 3, refer to Figure 12 From the object side to the image side, there are: a display screen 20 , a first lens 21 , a diaphragm, a second lens 22 , and a third lens 23 .

[0142] Wherein, the first lens 21, the second lens 22 and the third lens 23 respectively correspond to figure 2 The first lens 11, the second lens 12 and the third lens 13 described in, that is, the first lens 21 is a lens with negative refractive power, the radius of curvature of the object side of the first lens is a negative value, and the The radius of curvature of the image side of the first lens is a positive value, that is, the first lens is a lens with biconcave negative power, the second lens 22 is a lens with positive power, and the object side of the second lens is The radius of curvature is a positive value, and the radius of curvature of the image side of the second lens is a negative value, that is, the second lens 22 is a biconvex lens with positive power, and the third lens ...

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Abstract

A lens system, an optical fingerprint identification device and a terminal device are disclosed. The lens system comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side, the first lens is a biconcave lens with negative focal power, the second lens is a biconvex lens with positive focal power, the third lens is a lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the parameters of the lens system satisfy a first relationship:-0.7 < f1 * f3 / TTL <-0.15. By adopting the lens system provided by the embodiment of the invention, the longitudinal size of the optical fingerprint identification device using the lens system can be effectively shortened, so that the lens system or the optical fingerprint identification device can be better applied to terminal equipment with a requirement on the size, and the applicability of the lens system is enhanced; in addition, more installation space can be reserved for other devices in the terminal equipment.

Description

technical field [0001] The embodiments of the present application relate to the field of optical imaging, and more specifically, relate to a lens system, an optical fingerprint identification device, and a terminal device. Background technique [0002] In order to improve user experience, a high screen-to-body ratio has become the pursuit goal of mobile phone or other terminal equipment manufacturers. Since the optical fingerprint recognition technology under the screen uses the principle of optical imaging to collect fingerprint information, the fingerprint recognition module only needs to be installed on the terminal device. The fingerprint recognition can be realized under the display screen without occupying the display area of ​​the display screen, so the optical fingerprint recognition technology under the screen has become a mainstream technology. [0003] However, with the increasing diversification and specialization of mobile phone functions, various mobile phone f...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G06K9/00
CPCG02B13/00G02B13/18
Inventor 蔡斐欣徐百威葛丛
Owner 딕스테크이노베이션피티이리미티드