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Fresnel lens and detector

A Fresnel lens and lens technology, applied in the optical field, can solve the problems of low recognition sensitivity and poor focusing effect of sensing elements, and achieve the effects of improving the focusing effect, flexible design, and improving recognition sensitivity

Pending Publication Date: 2021-12-10
SHENZHEN BAIKANG OPTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the embodiments of the present application is to provide a Fresnel lens, aiming to solve the technical problem in the prior art that the poor focusing effect of the Fresnel lens leads to low recognition sensitivity of the sensing element

Method used

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  • Fresnel lens and detector

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Experimental program
Comparison scheme
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Embodiment 1

[0033] Please also refer to Figure 1 to Figure 4 , the Fresnel lens 10 provided by the embodiment of the present application is mainly used to focus the incident light on the sensing element 20; The photosensitive surface of the is set at the focal point of the Fresnel lens 10 , so that the Fresnel lens 10 focuses the incident light into the sensing element 20 . It should be noted that the sensing element 20 and the Fresnel lens 10 are the main components of the detector. In practical applications, when the human body moves within the detection range of the detector, the temperature difference between the human body temperature and the ambient temperature, The human body generates infrared light, and the infrared light is incident on the Fresnel lens 10, and the Fresnel lens 10 focuses the infrared light into the sensing element 20, so that the sensing element 20 sends out a corresponding electrical signal; wherein, the electrical signal It can be control signals such as ope...

Embodiment 2

[0057] Please also refer to Figure 1 to Figure 4 , based on the design concept of the Fresnel lens 10 in Embodiment 1, this embodiment also provides a detector, which includes a sensing element 20 and a Fresnel lens 10; wherein, the sensing element 20 is arranged at intervals between One side of the outgoing surface of the Fresnel lens 10, and the photosensitive surface of the sensing element 20 is located at the focal point of the Fresnel lens 10; it should be noted that, in practical applications, when the human body is within the detection range of the detector When moving, due to the temperature difference formed by the temperature of the human body and the environment, the human body generates infrared light, and the infrared light is incident on the Fresnel lens 10, and the Fresnel lens 10 focuses the infrared light into the sensing element 20, so that the sensor The sensing element 20 sends out a corresponding electrical signal; wherein, the electrical signal can be a ...

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Abstract

The invention provides a Fresnel lens and a detector. The Fresnel lens comprises a lens body, and the lens body is provided with an incident plane and an emergent plane which are oppositely arranged along a first direction; the incident surface or the emergent surface of the lens body is provided with a plurality of Fresnel lens units which are distributed in an array; the structures of the plurality of Fresnel lens units are different from each other; each Fresnel lens unit comprises a plurality of Fresnel teeth which are continuously arranged, each Fresnel tooth is provided with a tooth peak, a first tooth valley and a second tooth valley, the first tooth valley and the second tooth valley are located on the two sides of the tooth peak respectively, a main Fresnel surface is connected between the tooth peak and the first tooth valley, an auxiliary Fresnel surface is connected between the tooth peak and the second tooth valley, and the surface type of the main Fresnel surface is a free-form surface. The detector comprises a sensing element and a Fresnel lens. By the adoption of the technical scheme, the focusing effect of the Fresnel lens is improved, the Fresnel lens can meet the focusing requirements of higher requirements and larger detection interval range, and therefore the recognition sensitivity of the sensing element can be improved.

Description

technical field [0001] The present application belongs to the field of optical technology, and more specifically relates to a Fresnel lens and a detector. Background technique [0002] Detectors usually use sensing elements and Fresnel lenses to identify the movement of the human body within the detection range, where the function of the Fresnel lens is to focus the infrared light generated when the human body moves within the detection range onto the sensing element In this process, the sensing element generates a corresponding electrical signal; for example, at this time, the sensing element sends out a signal such as an alarm, turning on a light, or opening a door. [0003] The Fresnel lens generally includes a plurality of Fresnel lens units distributed in an array, and the Fresnel teeth of each Fresnel lens unit are annular, so that the focal points of each Fresnel lens unit are different. There is a phenomenon that the Fresnel lens cannot fully focus the infrared ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08G01V8/10
CPCG02B3/08G01V8/10
Inventor 周良姜君城何孟彪
Owner SHENZHEN BAIKANG OPTICAL