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an optical system

An optical system, a technology of positive refractive power, applied in the field of optical systems, can solve problems such as affecting the accuracy of iris recognition

Active Publication Date: 2019-08-16
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the two eyes occupy a small proportion of the entire image area, which will affect the accuracy of iris recognition

Method used

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  • an optical system
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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the shapes and dimensions of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same elements.

[0023] In the lens structure diagrams below, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation.

[0024] Specifically, the shape of the spherical or aspheric surface shown in the lens structure diagram is only shown by way of example. That is, spherical or aspheric surfaces are not limited to having the illustrated sh...

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Abstract

The invention discloses an optical system, and the system sequentially comprises a first lens with the positive refractive power, a second lens with the positive refractive power, a third lens with the negative refractive power and a fourth lens with the positive refractive power from the object space to the image space. The system provided by the invention has the central wavelength of 850nm, the view angle of about 12.8 degrees and the relative aperture of 1: 4, and can achieve the clear imaging in the range from 533nm to 813nm.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to an optical system. Background technique [0002] Iris tissue is a fabric-like ring of colour, and each iris contains a unique structure based on features like crowns, crystals, filaments, spots, pits, rays, wrinkles and stripes. Compared with several other biometrics such as fingerprints, biometrics based on iris features are superior. The iris characteristics of two people's eyes have not been found to be exactly the same in the world. As an effective identity authentication technology, iris recognition technology is gradually becoming the focus of research in the field of security authentication. [0003] The binocular iris acquisition optical system plays an important role in the entire iris image acquisition device, and the quality of the optical system will directly affect the iris recognition. The iris image standard promulgated by authoritative research ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00
CPCG02B13/0015G02B13/008
Inventor 焦国华章逸舟鲁远甫刘鹏陈良培陈巍刘文权罗阿郁周志盛罗栋
Owner SHENZHEN INST OF ADVANCED TECH