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Optical lens

An optical lens and lens technology, applied in the field of optical lenses, can solve problems such as DToF blanks, achieve large aperture, meet the needs of shooting, and achieve the effect of good image quality

Active Publication Date: 2022-07-15
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 embodiment, 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, it can ensure that the optical lens has the characteristics of large aperture, so that the luminous flux of the lens is large enough, and the image surface of the optical lens has a high illuminance. 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 embodiment, the optical lens satisfies the following conditional formula:

[0041] 4.3

[0042] Wherein, TTL represents the total optical length of the optical lens, and BFL r...

no. 1 example

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

[0090] The first lens L1 is a plastic aspherical 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 diaphragm ST is arranged 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]...

no. 2 example

[0103] For a schematic structural diagram of the optical lens 200 provided in this embodiment, please refer to Image 6 Compared with the optical lens 100 in the first embodiment, the optical lens 200 in this embodiment has little structural 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] Table 4 shows the surface shape coefficients of each aspherical surface of the optical lens 200 in this embodiment.

[0108] Table 4

[0109]

[0110] In this embodiment, the graphs of the field curvature, distortion, on-axis point spherical aberration and lateral chromatic aberration of the optical lens 200 are respectively 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 curvature of field is controlled within ±1mm, the distortion i...

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Abstract

The invention discloses an optical lens. The optical lens comprises in sequence from an object side to an imaging plane along an optical axis: a first lens with positive refractive power; a diaphragm; a second lens with negative refractive power; wherein, the optical lens satisfies the following conditional formula: f / EPD<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 characteristics of a large aperture, has good imaging quality in a dark environment, can achieve the purpose of clear imaging, and meets the needs of DToF lens shooting.

Description

technical field [0001] The present 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 has brought great convenience to people's daily life; at the same time, with the wide application of optical lenses, the application scope of optical lenses is also expanding, not only limited to optical imaging , including scanning, ranging, face recognition, mobile payment, etc. With the promotion of DToF (direct measurement of time of flight) in high-end consumer electronics, SPAD and related semiconductor technologies will receive more attention, and the domestic industry chain will follow up quickly. [0003] However, China is still in the stage of localization of DToF, and it is relatively blank in the DToF industry. Since DToF directly measures the distance based on the time difference between pulse emission and reception, the lens has ...

Claims

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Application Information

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Patent Type & Authority Patents(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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