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Large-image-surface optical imaging lens

An optical imaging lens and image plane technology, applied in the lens field, can solve problems such as inability to measure and recognize long-distance targets, drop, small size of the image plane, etc.

Pending Publication Date: 2021-04-09
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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  • Large-image-surface optical imaging lens
  • Large-image-surface optical imaging lens
  • Large-image-surface optical imaging lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] like figure 1 As shown, an optical imaging lens with a large image surface includes a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, and a fourth lens along an optical axis I from the object side A1 to the image side A2. 4. The fifth 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 image side facing the image side A2 through which imaging rays pass.

[0087] The first lens 1 is the first lens counted from the object side A1, the first lens 1 has a 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 convex surface, but Not limited thereto, in some embodiments, the image side 12 of the first lens 1 may also be a plane or a concave surface.

[0088] The second lens 2 is the second le...

Embodiment 2

[0104] like Image 6 As shown, the surface concave-convex and refractive power of each lens in this embodiment and the first embodiment are approximately the same, only the image side 11 of the first lens 1 is a plane, and in addition, the optical parameters such as the radius of curvature of each lens surface, lens thickness, etc. Also different.

[0105] The detailed optical data of this specific embodiment are shown in Table 2-1.

[0106] Detailed optical data of Table 2-1 Example 2

[0107]

[0108]

[0109] Please refer to Table 6 for the values ​​of the relevant conditional expressions in this specific embodiment.

[0110] 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 field; for field curvature and distortion diagrams, ...

Embodiment 3

[0113] like Figure 11 As shown, the surface concave-convex and refractive power of each lens in this embodiment and the first embodiment are approximately the same, only the image side 11 of the first lens 1 is a plane, and in addition, the optical parameters such as the radius of curvature of each lens surface, lens thickness, etc. Also different.

[0114] The detailed optical data of this specific embodiment are shown in Table 3-1.

[0115] Detailed optical data of the third embodiment of table 3-1

[0116]

[0117]

[0118] Please refer to Table 6 for the values ​​of the relevant conditional expressions in this specific embodiment.

[0119] 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 dis...

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Abstract

The invention relates to the technical field of lenses. The invention discloses a large-image-surface optical imaging lens, which comprises seven lenses, and is characterized in that a first lens has a positive refractive index and a convex object side surface, a second lens is a convex-concave lens with a positive refractive index, and a third lens has a positive refractive index and a convex object side surface; and the fourth lens element with negative refractive index has a concave image-side surface. The combined focal length of the third lens and the fourth lens is negative; the fifth lens is a concave lens with a negative refractive index, the sixth lens has a positive refractive index, and the image side surface of the sixth lens is a convex surface; the seventh lens is a convex plane or convex-concave lens with a positive refractive index; and the third lens and the fourth lens can also be replaced by a convex-concave lens with a negative refractive index. The optical imaging lens has the advantages of large light transmission, uniform relative illuminance, high resolution, small distortion, good imaging quality, miniaturization, low cost and high design yield.

Description

technical field [0001] The invention belongs to the technical field of lenses, in particular to an optical imaging lens with a large image surface 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-distanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G01S17/894G01S7/481
CPCG02B13/0015G02B13/005G01S17/894G01S7/4816
Inventor 郑毅池鸿洲李可
Owner XIAMEN LEADING OPTICS