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Athermalized Large Aperture Objective Optical System

An optical system, large aperture technology, applied in optics, optical components, instruments, etc., can solve problems such as ghosting, and achieve the effect of no ghosting and good imaging quality

Active Publication Date: 2020-04-14
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the existing technology, almost all objective lenses are insufficient in ghost image processing, and there are obvious ghost images

Method used

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  • Athermalized Large Aperture Objective Optical System
  • Athermalized Large Aperture Objective Optical System
  • Athermalized Large Aperture Objective Optical System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown, this embodiment includes in order from the object plane to the image plane: the first lens group A with negative refractive power, the second lens group B with positive refractive power, and the third lens group C with positive refractive power , The fourth lens group D with positive refractive power.

[0030] The first lens group A includes: a first lens L1 with positive power, a second lens L2 with negative power, a third lens L3 with positive power, and a third lens L3 with negative power. Four lenses L4, wherein: the third lens L3 and the fourth lens L4 synthesize a cemented lens.

[0031] The second lens group B includes: a fifth lens L5 with positive refractive power and a sixth lens L6 with negative refractive power.

[0032] The diaphragm STP in this embodiment is disposed on the second surface of the sixth lens L6 and is a fixed diaphragm.

[0033] The third lens group C includes: a seventh lens L7 with negative refractive power an...

Embodiment 2

[0056] The difference between this embodiment and Embodiment 1 is that the diaphragm STP of this embodiment adopts a fixed independent diaphragm.

[0057] Its specific parameters are set as follows:

[0058] Fno = 0.985;

[0059] f 1 = 30.4656;

[0060] Nd 2 =1.437,Vd 2 =95.1, f 2 = -13.2494, α 2 = -6.3;

[0061] Nd 3 =1.713, Vd 3 =53.9,Nd 4 =1.945, Vd 4 =17.9,|f 3 / f 4 |=1.288,|f 34 |=54.2344;

[0062] Nd 5 =1.921, Vd 5 = 23.9;

[0063] Nd 6 =1.437,Vd 6 =95.1,α 6 = -6.3;

[0064] Nd 8 = 1.496, Vd 8 =81.6,α 8 = -6.2;

[0065] Nd 9 =1.91, Vd 9 = 35.2;

[0066] Nd 11 = 1.496, Vd 11 =81.6,α 11 = -6.2;

[0067] Nd 12 =1.91, Vd 12 = 35.2;

[0068] Table 2 shows the structural parameters of the optical system of the present embodiment

[0069] Table 2

[0070]

[0071]

[0072] Such as Figure 7 Shown is a diagram of each aberration of the lens of Example 2 with respect to the d-line (λ=587.56 nm). In addition, S and M in the astigmatism ...

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Abstract

An athermalized large-aperture objective optical system, from the object plane to the image plane, includes: the first lens group with negative refractive power, the second lens group with positive refractive power, a diaphragm, and a focal power of The third lens group is positive, and the fourth lens group has positive refractive power. The present invention adopts three sets of glued lenses and no thermal difference design, which can achieve temperature compensation, effectively suppress ghost images, and effectively correct aberrations such as spherical aberration and chromatic aberration while clear imaging under low-light conditions.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to an athermalized large-aperture objective lens optical system. Background technique [0002] For existing large-aperture lenses, in addition to considering whether the imaging is clear under low-light conditions in the visible light band, it is also necessary to consider whether the imaging can always be clear when the temperature changes. The operating temperature of most objective lenses is limited by the phenomenon of thermalization, so most objective lenses cannot be used in environments with complex temperature changes. In addition, large-aperture objective lenses are more used in poor lighting conditions. If a brighter light source suddenly appears in the picture, the slight ghost image produced at this time will be very obvious in the whole picture. Under the prior art, almost all objective lenses are insufficient in ghost image processing, and there are rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B7/02
CPCG02B7/021G02B7/025G02B13/005
Inventor 谢晨张师朋葛航笠盛亚茗尚洁阳
Owner JIAXING ZHONGRUN OPTICAL TECH
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