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Optical lens

A kind of optical lens and lens technology, applied in the field of optical lens, can solve the problem of DToF blank and so on, achieve the effect of large aperture, good imaging quality, and meet the needs of shooting

Active Publication Date: 2022-03-22
JIANGXI LIANYI OPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the country is still in the stage of localization of DToF, and the DToF industry is relatively blank
Since DToF measures the distance directly based on the time difference between pulse transmission and reception, the lens has an important impact on the performance of DToF, but the existing optical lens is difficult to meet the needs of DToF shooting

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] As an implementation, the optical lens satisfies the following conditional formula:

[0036] f / EPD<1.15; (1)

[0037] Wherein, f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens.

[0038] When the conditional formula (1) is satisfied, by limiting the f / EPD within a reasonable range, the optical lens can be guaranteed to have the characteristics of a large aperture, so that the luminous flux of the lens is large enough to ensure that the image plane of the optical lens has a high illuminance, ensuring The optical lens has good image quality in dark environment.

[0039] Preferably, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 0.85<f / EPD<1.15.

[0040] As an implementation, the optical lens satisfies the following conditional formula:

[0041] 4.3

[0042] Wherein, TTL represents the total optical length of...

no. 1 example

[0089] Please refer to figure 1 , which is a schematic structural view of the optical lens 100 provided by the first embodiment of the present invention, the optical lens 100 includes in sequence from the object side to the imaging surface S9 along the optical axis: a first lens L1, a stop ST, and a second lens L2 , the third lens L3 and the filter G1.

[0090] The first lens L1 is a plastic aspheric lens with positive refractive power, the object side of the first lens is S1, and the image side of the first lens is S2;

[0091] The stop ST is disposed between the first lens L1 and the second lens L2;

[0092] The second lens L2 is a plastic aspheric lens with negative refractive power, the object side of the second lens is S3, and the image side of the second lens is S4;

[0093] The third lens L3 is a plastic aspheric lens with positive refractive power, the object side of the third lens is S5, and the image side of the third lens is S6;

[0094] The filter G1 has an obje...

no. 2 example

[0103] For the structural schematic diagram of the optical lens 200 provided in this embodiment, please refer to Figure 6 , compared with the optical lens 100 in the first embodiment, the structure of the optical lens 200 in this embodiment has little change, and the biggest change is the thickness of the third lens.

[0104] The relevant parameters of each lens in the optical lens 200 provided in this embodiment are shown in Table 3.

[0105] table 3

[0106]

[0107] The surface coefficients of each aspheric surface of the optical lens 200 in this embodiment are shown in Table 4.

[0108] Table 4

[0109]

[0110] In this embodiment, the curves of field curvature, distortion, axial point spherical aberration and lateral chromatic aberration of the optical lens 200 are as follows Figure 7 , Figure 8 , Figure 9 and Figure 10 shown. Depend on Figure 7 to Figure 10 It can be seen that the field curvature is controlled within ±1mm, the distortion is controlled...

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Abstract

The invention discloses an optical lens. The optical lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an imaging surface along an optical axis, a diaphragm; the second lens has negative focal power; the third lens has positive focal power; the optical lens satisfies the following conditional expression: f / EPDlt, 1.15, 1.15; wherein f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. The optical lens has the characteristic of large aperture, has good imaging quality in a dark environment, can achieve the purpose of clear imaging, and meets the requirement of DDoF lens shooting.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to an optical lens. Background technique [0002] At present, with the rapid development of portable electronic products, it brings great convenience to people's daily life; at the same time, with the wide application of optical lenses, the scope of application of optical lenses is also expanding, not limited to optical imaging , including scanning, ranging, face recognition, mobile payment, etc. With the promotion of DToF (direct measurement of flight time) in the field of high-end consumer electronics, more attention will be paid to SPAD and related semiconductor technologies, and the domestic industrial chain will also follow up quickly. [0003] However, the country is still in the stage of localization of DToF, and the DToF industry is relatively blank. Since DToF measures the distance directly based on the time difference between pulse transmission and reception, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 钟培森章彬炜曾昊杰张启灿
Owner JIANGXI LIANYI OPTICS CO LTD
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