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Optical imaging lens

An optical imaging lens and lens technology, applied in the field of lenses, can solve the problems of inability to measure and recognize long-distance targets well, the overall size of high-resolution TOF lenses is large, and affects the effect and reliability of 3D scanning, so as to reduce the serious situation of pixel loss , Increase the recognition range, good control effect

Pending Publication Date: 2021-04-06
XIAMEN LEADING OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In a system using TOF (time of flight) technology for 3D scanning, the performance of the TOF lens is critical, which will greatly affect the effect and reliability of 3D scanning
However, TOF lenses currently on the market still have many deficiencies, such as the small size of the image surface, which cannot achieve a good measurement and recognition effect on long-distance targets; the control of distortion is poor, and distortion correction leads to a large number of pixel losses; the overall size of high-resolution TOF lenses is relatively small. Large, there is a gap with the miniaturization demand of the market; in order to achieve large-scale light, the relative illuminance of the peripheral field of view is sacrificed, and the illuminance changes greatly, etc., which can no longer meet the increasing requirements of the 3D scanning field, and urgently need to be improved

Method used

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  • Optical imaging lens
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Such as figure 1 As shown, an optical imaging lens includes a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, a fourth lens 4, and a fifth lens along an optical axis I from the object side A1 to the image side A2. Lens 5, the sixth lens 6, the seventh lens 7, the protective glass 9 and the imaging surface 100; the first lens 1 to the seventh lens 7 each include an object side facing the object side A1 and allowing the imaging light to pass through and an object side facing the image Side A2 and let the imaging light pass through the image side.

[0077] The first lens 1 has positive refractive power, the object side 11 of the first lens 1 is a convex surface, and the image side 12 of the first lens 1 is a plane. Of course, in other embodiments, the image side 12 of the first lens 1 may also be convex or concave.

[0078] The second lens 2 has positive refractive power, the object side 21 of the second lens 2 is convex, and the image side 22 of the second...

Embodiment 2

[0093] Such as Image 6 As shown, the surface concave-convex and refractive power of each lens in this embodiment are approximately the same as those in Embodiment 1, and only the image side 31 of the third lens 3 is concave. In addition, the optical parameters such as the radius of curvature of each lens surface and lens thickness Also different, the sixth lens 6 and the seventh lens 7 are separate lenses.

[0094] The detailed optical data of this specific embodiment are shown in Table 2-1.

[0095] Detailed optical data of Table 2-1 Example 2

[0096]

[0097] Please refer to Table 6 for the values ​​of the relevant conditional expressions in this specific embodiment.

[0098] The MTF transfer function curve figure of this specific embodiment sees for details Figure 7 , see the defocus curve for details Figure 8 , it can be seen that the resolution is high, the contrast is high, and the imaging quality is excellent, reaching the high-resolution level in the TOF fie...

Embodiment 3

[0101] Such as Figure 11 As can be seen, the concave-convex surface and refractive index of each lens in this embodiment and the first embodiment are the same, and only the optical parameters such as the radius of curvature of the lens surface and the thickness of the lens are different.

[0102] The detailed optical data of this specific embodiment are shown in Table 3-1.

[0103] Detailed optical data of the third embodiment of table 3-1

[0104]

[0105] Please refer to Table 6 for the values ​​of the relevant conditional expressions in this specific embodiment.

[0106] The MTF transfer function curve figure of this specific embodiment sees for details Figure 12 , see the defocus curve for details Figure 13 , it can be seen that the resolution is high, the contrast is high, and the imaging quality is excellent, reaching the high-resolution level in the TOF field; for field curvature and distortion diagrams, please refer to Figure 14 (A) and (B), it can be seen tha...

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Abstract

The invention relates to the technical field of lenses. The invention discloses an optical imaging lens which comprises seven lenses, the first lens has a positive refractive index, the object side surface of the first lens is convex, the second lens is a convex-concave lens with a positive refractive index, the third lens has a negative refractive index, the image side surface of the third lens is a concave surface, and the fourth lens and the seventh lens have concave concave lenses with negative refractive indexes. The fifth lens is a convex lens with a positive refractive index, the sixth lens is a convex plane or convex lens with a positive refractive index, and the fourth lens and the fifth lens are glued with each other. The optical imaging lens has the advantages of large light transmission, uniform relative illuminance, high resolution, small distortion, good imaging quality, large image surface, miniaturization and high design yield.

Description

technical field [0001] The invention belongs to the technical field of lenses, in particular to an optical imaging lens for time-of-flight measurement. Background technique [0002] With the continuous advancement of science and technology and the continuous development of society, optical imaging lenses have also developed rapidly in recent years. Optical imaging lenses are widely used in smart phones, tablet computers, video conferencing, vehicle monitoring, security monitoring, 3D scanning Therefore, the requirements for optical imaging lenses are also increasing. [0003] In a system using TOF (time of flight) technology for 3D scanning, the performance of the TOF lens is critical, which will greatly affect the effect and reliability of 3D scanning. However, TOF lenses currently on the market still have many deficiencies, such as the small size of the image surface, which cannot achieve a good measurement and recognition effect on long-distance targets; the control of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00
CPCG02B13/0015G02B13/006
Inventor 郑毅池鸿洲李可
Owner XIAMEN LEADING OPTICS