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Hybrid prime lens

A fixed-focus lens and combined focal length technology, applied in the lens field, can solve the problems of not being able to meet the day and night confocal and resolution requirements, and achieve the effects of improving market competitiveness, excellent imaging quality, and expanding the scope of application

Pending Publication Date: 2017-12-29
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neither can meet the resolution requirements of FNO1.8 or below, 4K or 8 million pixels
Moreover, ordinary glass-plastic hybrid fixed-focus lenses cannot meet the requirements of day and night confocal and no virtual focus in the temperature range of -40°C to 80°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0067] based on figure 1 The shown lens configuration is used to illustrate this embodiment.

[0068] As the data given in Embodiment 1 in Table 1, the combined focal length f of the front group lens A A Combined focal length f with rear group lens B B satisfies f between B / f A =-0.83;

[0069] Combined focal length f of rear group lens B B The effective focal length f of the lens satisfies f B / f=1.52;

[0070] The distance d from the center of the image side of the seventh lens 7 to the image surface and the effective focal length f of the lens satisfy d / f=1.41;

[0071] The effective focal length of the glass-plastic hybrid fixed-focus lens according to the present invention is f=4.55, and FNO=1.4.

[0072] The following table 2 lists the focal length of each lens in the present embodiment:

[0073] f1

f2

f3

f4

f5

f6

f7

-7.95

-21.48

20.69

7.06

-14.58

12.81

-118.04

[0074] Table 2

[0075] The following tabl...

Embodiment approach 2

[0090] Figure 7 It schematically shows the structural diagram of the glass-plastic hybrid fixed-focus lens according to the second embodiment of the present invention. The description according to this embodiment is as follows:

[0091] As the data given in Embodiment 1 in Table 1, the combined focal length f of the front group lens A A Combined focal length f with rear group lens B B satisfies f between B / f A =-0.58;

[0092] Combined focal length f of rear group lens B B The effective focal length f of the lens satisfies f B / f=1.38;

[0093] The distance d from the center of the image side of the seventh lens 7 to the image surface and the effective focal length f of the lens satisfy d / f=1.37;

[0094] The effective focal length of the glass-plastic hybrid fixed-focus lens according to the present invention is f=5.77, and FNO=1.4.

[0095] The following table 5 lists the focal length of each lens in the present embodiment:

[0096] f1

f2

f3

f4

...

Embodiment approach 3

[0113] Figure 13 It schematically shows the structural diagram of the glass-plastic hybrid fixed-focus lens according to the third embodiment of the present invention. The description according to this embodiment is as follows:

[0114] As the data given in Embodiment 1 in Table 1, the combined focal length f of the front group lens A A Combined focal length f with rear group lens B B satisfies f between B / f A =-0.16;

[0115] Combined focal length f of rear group lens B B The effective focal length f of the lens satisfies f B / f=1.65;

[0116] The distance d from the center of the image side of the seventh lens 7 to the image surface and the effective focal length f of the lens satisfy d / f=1.38;

[0117] The effective focal length of the glass-plastic hybrid fixed-focus lens according to the present invention is f=4.6, and FNO=1.4.

[0118] The following table 8 lists the focal length of each lens in the present embodiment:

[0119] f1

f2

f3

f4

...

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Abstract

The invention relates to a hybrid prime lens, and the prime lens comprises a front lens group, a diaphragm and a rear lens group from the object space to the image space along an optical axis. The front lens group consists of a first lens, a second lens and a third lens, wherein the first, second and third lens are sequentially arranged from the object space to the image space. The rear lens group consists of a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from the object space to the image space along the optical axis. The lens comprises a glass lens and a plastic aspherical lens. The first, second, fifth and seventh lenses are lenses with the negative focal power. The third, fourth and sixth lenses are lenses with the positive focal power. The fourth and fifth lenses form a glued lens group with the positive focal power. According to the invention, the prime lens achieves the 4K resolution under the condition: FNO>=1.4. The prime lens achieves the day and night focus sharing and no defocusing effect under temperature from -40 DEG C to 80 DEG C, and enlarges the application range.

Description

technical field [0001] The invention relates to a lens, in particular to a glass-plastic hybrid fixed-focus lens. Background technique [0002] As the main component of the security system, the performance of the lens determines the imaging performance of the security system. With the development of the security field, the application range of cameras is becoming wider and wider, and higher requirements are put forward for the resolution, aperture, high and low temperature performance, and day and night confocal of the lens. Currently on the market, high-definition lenses have become standard configurations, and their pixels are generally below 6 million pixels, and the FNO is above 1.8. For the lens disclosed in CN106772946A, the FNO is 2.0. Another example is the lens disclosed in CN106772939A with a resolution of 5 million pixels. None of them can meet the resolution requirements of FNO1.8 and below, 4K or 8 million pixels. Moreover, ordinary glass-plastic hybrid fixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B1/04G02B1/00
CPCG02B13/0045G02B1/00G02B1/041
Inventor 贺保丁付湘发梁伟朝白兴安蓝岚周静张鸿佳
Owner 舜宇光学(中山)有限公司
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