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Imaging lens

An imaging lens and lens technology, applied in the field of imaging lens, can solve problems such as inability to meet imaging requirements, and achieve the effects of improving marginal light aberration, high relative illuminance, and high imaging quality

Active Publication Date: 2017-09-29
ZHEJIANG SUNNY OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, lenses with an aperture number Fno of 2.0 or above can no longer meet higher-level imaging requirements

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0076] Refer to the following Figure 1 to Figure 2C An imaging lens according to Embodiment 1 of the present application is described. figure 1 A schematic structural diagram of an imaging lens according to Embodiment 1 of the present application is shown.

[0077] Such as figure 1 As shown, the imaging lens sequentially includes a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 and an imaging surface S11 along the optical axis from the object side to the imaging side. The imaging lens may further include a photosensitive element disposed on the imaging surface S11.

[0078] The first lens L1 has negative refractive power, the object side S1 is concave, the image side S2 is concave, and both the object side S1 and the image side S2 of the first lens L1 are aspherical.

[0079] The second lens L2 has positive refractive power, the object side S3 is convex, the image side S4 is concave, and both the object side S3 and the image side S4 of the second len...

Embodiment 2

[0100] Refer to the following Figure 3 to Figure 4C An imaging lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. image 3 A schematic structural diagram of an imaging lens according to Embodiment 2 of the present application is shown.

[0101] Such as image 3 As shown, the imaging lens sequentially includes a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 and an imaging surface S11 along the optical axis from the object side to the imaging side. The imaging lens may further include a photosensitive element disposed on the imaging surface S11.

[0102] The first lens L1 has negative refractive power, the object side S1 is concave, the image side S2 is concave, and both the object side S1 and the image side S2 of the first lens L1 are aspherical.

[0103] The second lens L2 has positive refrac...

Embodiment 3

[0117] Refer to the following Figure 5 to Figure 6C An imaging lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an imaging lens according to Embodiment 3 of the present application is shown.

[0118] Such as Figure 5 As shown, the imaging lens sequentially includes a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 and an imaging surface S11 along the optical axis from the object side to the imaging side. The imaging lens may further include a photosensitive element disposed on the imaging surface S11.

[0119] The first lens L1 has negative refractive power, its object side S1 is concave, its image side S2 is convex, and both the object side S1 and the image side S2 of the first lens L1 are aspherical.

[0120] The second lens L2 has positive refractive power, the object side S3 is convex, the image side S4 is concave, and both the object side S3 and the image side S4 of the second le...

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Abstract

The invention discloses an imaging lens which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the optical axis from the object side to the image side. The object-side surface of the first lens is concave. The image-side surface of the fourth lens is concave. The second lens has positive refractive power. At least one of the first lens, the third lens and the fourth lens has negative refractive power. The effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens meets the condition that f3 / f4>0.

Description

technical field [0001] The present application relates to an imaging lens, and more specifically, the present application relates to a large-aperture, wide-angle imaging lens including four lenses. Background technique [0002] With the improvement of performance and size reduction of commonly used photosensitive elements such as photosensitive coupling devices (CCD) or complementary metal oxide semiconductor elements (CMOS), the performance of photosensitive elements is improved and the size is reduced, so that for matching imaging lenses Higher imaging quality and miniaturization put forward higher requirements. [0003] At the same time, with the continuous development of portable electronic products such as smart phones and depth detection cameras, higher requirements are placed on the miniaturization and high imaging quality of imaging lenses. In order to meet the requirements of compact structure and high imaging quality, the aperture number Fno (the total effective f...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/18
CPCG02B13/004G02B13/06G02B13/18
Inventor 黄林
Owner ZHEJIANG SUNNY OPTICAL CO LTD
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