Large-aperture optical system

An optical system and aperture technology, applied in optics, optical components, instruments, etc., can solve the problems of poor imaging performance of large aperture optical systems, and achieve the effects of good manufacturability, high imaging quality and high contrast.

Pending Publication Date: 2021-03-02
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the above problems, provide a large aperture optical system, and solve the problem of poor imaging performance of the large aperture optical system

Method used

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Experimental program
Comparison scheme
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Embodiment approach

[0066] Such as figure 1 As shown, according to an embodiment of the present invention, a large aperture optical system of the present invention includes: a front lens group and a rear lens group arranged in sequence from the object side to the image side; in this embodiment, the front lens group It includes: a first lens 1 with negative refractive power, a second lens 2 with negative refractive power, and a third lens 3 with positive refractive power arranged sequentially from the object side to the image side;

[0067] The rear lens group includes: the fourth lens 4 with positive refractive power, the fifth lens 5 with negative refractive power, the sixth lens 6 with positive refractive power, and the sixth lens 6 with negative refractive power arranged in sequence from the object side to the image side The seventh lens 7 and the eighth lens 8 with positive refractive power. In this embodiment, the fifth lens 5 and the sixth lens 6 are cemented to form a doublet lens with po...

Embodiment approach 1

[0090] see figure 1 As shown, in this embodiment, the parameters of the large aperture optical system are as follows:

[0091] Total length TTL = 22.2mm;

[0092] Aperture FNO=1.0;

[0093] The fourth lens 4 and the sixth lens 6 are low dispersion glass lenses with an Abbe number Vd≥60; the third lens 3 and the seventh lens 7 have a refractive index Nd≥1.6.

[0094] In this embodiment, the large-aperture optical system of the present invention has a total of eight lenses, including a cemented lens group, plus a diaphragm surface, an optical element IR / CG surface, and an image surface, a total of 19 surfaces. These 19 surfaces are arranged sequentially according to the structural order of the present invention. For the convenience of description, the 19 surfaces are numbered S1 to S19, wherein the stop surface S is S7, and the cemented surface in the cemented lens group is represented by a number, as The surface Image is denoted as S19.

[0095] Table 2 is the parameter tab...

Embodiment approach 2

[0105] see Figure 7 shown. In this embodiment, the parameters of the large aperture optical system are as follows:

[0106] Total length TTL=22mm; Aperture FNO=1.0;

[0107] The fourth lens 4 and the sixth lens 6 are low dispersion glass lenses with an Abbe number Vd≥60; the second lens 2 , the third lens 3 and the seventh lens 7 have a refractive index Nd≥1.6.

[0108] In this embodiment, the large-aperture optical system of the present invention has a total of eight lenses, including a cemented lens group, and a total of 19 surfaces including the diaphragm surface S, the optical element IR / CG surface, and the image surface Image. These 19 surfaces are arranged sequentially according to the structural order of the present invention. For the convenience of description, the 19 surfaces are numbered S1 to S19, wherein the stop surface S is S7, and the cemented surface in the cemented lens group is represented by a number, as The surface Image is denoted as S19.

[0109] Table...

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Abstract

The invention relates to a large-aperture optical system. The large-aperture optical system comprises a front lens group and a rear lens group which are sequentially arranged from an object side to animage side, wherein the front lens group comprises a first lens (1) with negative focal power, a second lens (2) with negative focal power and a third lens (3) with positive focal power; the rear lens group comprises a fourth lens (4) with positive focal power, a fifth lens (5) with negative focal power, a sixth lens (6) with positive focal power, a seventh lens (7) with negative focal power andan eighth lens (8) with positive focal power; and the fifth lens (5) and the sixth lens (6) are glued to form a doublet lens with positive focal power. According to the large-aperture optical system,the positive focal power and the negative focal power of each lens are optimally configured, so that the aberration is effectively corrected, and the imaging quality of the whole optical system is further improved.

Description

technical field [0001] The invention relates to the field of optical imaging, in particular to a large aperture optical system. Background technique [0002] Since security monitoring needs to be carried out 24 / 7, clear imaging in low light and night environments is very important. At present, some star-level cameras have appeared on the market, but there are still some performance defects that limit their application scenarios, such as the wide-angle end angle is not large enough, and the monitoring range is limited; the aperture is small, which cannot meet the monitoring needs of low-light environments; There are many disadvantages such as low efficiency, small zoom range, limited monitoring range, etc.; no day and night confocal function, and the imaging effect is poor at night with low brightness. Contents of the invention [0003] The purpose of the present invention is to solve the above problems, provide a large aperture optical system, and solve the problem of poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/00G02B13/0015G02B13/0045G02B13/006G02B13/18
Inventor 何明可尚金倩梁伟朝
Owner 舜宇光学(中山)有限公司
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