Prime lens

A fixed-focus lens and lens technology, which is applied in the field of fixed-focus lenses, can solve the problem of fewer lenses and achieve the effect of meeting imaging requirements

Pending Publication Date: 2019-09-06
DONGGUAN YUTONG OPTICAL TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, few lenses on the market are compatible with low-light image sensors

Method used

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Embodiment Construction

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0058] figure 1 is a structural schematic diagram of a fixed-focus lens provided by an embodiment of the present invention, as shown in figure 1As shown, the fixed-focus lens provided by the embodiment of the present invention includes: a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, and a fifth lens 50 arranged in sequence along the optical axis from the object side to the image side , the sixth lens 60, the seventh lens 70 and the eighth lens 80; the first lens 10 is a negative power lens;...

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Abstract

The invention discloses a prime lens, which comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with negative focal power and an eighth lens with positive focal power which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens, the second lens, the third lens, the fourth lens, the seventh lens and the eighth lens are all aspherical lenses; both the fifth lens and the sixth lens are spherical lenses; refractive indexes of the first lens, the second lens, the third lens and the eighth lens are between 1.5 and 1.6; refractive indexes of the fourth lens, the sixth lens and the seventh lens are between 1.6 and 1.7; and the refractive index of the fifth lens is between 1.4 and 1.5. The prime lens has the advantages of extra large amount of light flux, ensures that the resolution meets the imaging requirements when used in the environment of -40 DEG C to 80 DEG C, and is suitable to be used under low illumination conditions.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of optical devices, and in particular to a fixed-focus lens. Background technique [0002] With the improvement of people's safety awareness and the increasing popularity of security monitoring facilities, the requirements for monitoring environment and screen are getting higher and higher. [0003] At present, in order to improve the monitoring imaging quality, low-illuminance image sensors have been developed. [0004] However, there are very few lenses on the market that can match low-light image sensors. Contents of the invention [0005] The invention provides a fixed-focus lens. The fixed-focus lens has the characteristics of super large light flux, and at the same time, when used in an environment of -40°C to 80°C, the resolution can meet the imaging requirements, and is suitable for use under low illumination conditions. [0006] An embodiment of the present invention provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18
CPCG02B13/0045
Inventor 张品光刘官禄何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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