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optical lens

An optical lens and lens technology, applied in the field of optical lens, can solve the unsatisfied, large lens volume, difficulty in meeting the thinning of smart phones, etc., and achieve the effect of reducing the spot size and good optical performance

Active Publication Date: 2022-05-03
SINTAI OPTICAL SHENZHEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to fully irradiate the user's face with infrared light, the lens of the infrared light source is relatively large, which is difficult to meet the thinning requirements of smart phones.
[0004] So while current IR projection lenses are adequate for their intended purpose, they have not met many other requirements

Method used

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Embodiment Construction

[0033] The following description provides many different embodiments, or examples, for implementing various features of the invention. The components and arrangements described in the following specific examples are only used to express the present invention in a concise manner, which are only examples and not intended to limit the present invention. For example, a description of a first feature on or over a second feature includes direct contact between the first and second features, or another feature disposed between the first and second features such that the first It is not in direct contact with the second feature.

[0034] In addition, in this specification, the same component symbols and / or characters are used in different examples. The aforementioned repetition is only for simplification and clarity, and does not mean that different embodiments and settings must be related. In the present invention, "about" is defined as a specific parameter or value, which means th...

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Abstract

An optical lens includes a first lens, a second lens, a third lens and a fourth lens in sequence from the object side to the image side along the optical axis. The first lens is a crescent lens and has positive refractive power. The second lens has positive refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens has positive refractive power. The fourth lens includes a fourth image side facing the image side, and the fourth image side is a convex surface. Optical lenses satisfy the following formula:‑8

Description

technical field [0001] The invention mainly relates to a lens, especially an optical lens. Background technique [0002] With the development of smart phones, in addition to general shooting functions, a system for face recognition has been further developed. The user can unlock the mobile phone more easily when using the mobile phone, and further enhance the anti-theft function. [0003] In known face recognition systems, infrared rays can be used for detection. However, in order to completely irradiate the user's face with infrared rays, the lens of the infrared light source is relatively large, which is difficult to meet the requirement of thinning the smartphone. [0004] Thus, while current IR projection lenses are adequate for their intended purpose, they have not met many other requirements. Therefore, it is necessary to provide an improved solution for the infrared projection lens. Contents of the invention [0005] The technical problem to be solved by the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/004G02B13/18
Inventor 曾明煌张锡龄
Owner SINTAI OPTICAL SHENZHEN CO LTD