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Compact telephoto lens

A telephoto lens, compact technology, applied in the field of optical lenses, can solve the problems of not being able to meet the needs of consumers, not having a long focal length, etc.

Active Publication Date: 2020-10-27
RUITAI OPTICAL CHANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current miniaturized photographic lenses do not have a long focal length and cannot meet the needs of consumers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Please also see Figure 1-3 , the compact telephoto lens 100 provided according to the present invention includes a diaphragm 20, a secondary mirror 30, a primary mirror 40, and a field lens 50 arranged sequentially from the object side to the image side, and the shading sheet 10 and the diaphragm 20 are in The positions along the direction of the optical axis OO' overlap, and an optical filter 60 may be arranged between the field lens 50 and the image plane 70, and the field lens 50 is used to further eliminate aberrations. In other embodiments, the field lens 50 may not be provided, and aberrations are eliminated only through the primary mirror 40 and the secondary mirror 30 .

[0042] The primary mirror 40 includes a first lens 41 and a second lens 42, the secondary mirror 30 includes a third lens 32 and a fourth lens 31, the first lens 41 and the third lens 32 are Mankin mirrors Specifically, the surface of the first lens 41 close to the image plane is a reflective...

Embodiment 2

[0125] Embodiment 2 is basically the same as Embodiment 1, and the symbol meanings are the same as Embodiment 1. Only the differences are listed below.

[0126] Table 3 and Table 4 show the design data of the compact telephoto lens 200 according to Embodiment 2 of the present invention.

[0127] 【table 3】

[0128]

[0129] Table 4 shows the aspheric data of each lens in the compact telephoto lens 200 according to the second embodiment of the present invention.

[0130] 【Table 4】

[0131]

[0132] Figure 7 A structural schematic diagram of the compact telephoto lens 200 is shown. In this embodiment, D1=5.073mm, D2=2.225mm, the blocking ratio is equal to 0.44, and the optical performance is excellent.

[0133] In this embodiment, f1=19.471, f2=5.208, f3=-19.145, f4=-2.598, f5=19.122, f6=-224.019, f7=-7.109, R1 / R2=54.436, f5 / f2=3.672, f6 / f7=31.512, which satisfies the various conditional expressions described in detail in the first embodiment.

[0134] In this embodi...

Embodiment 3

[0138] Embodiment 3 is basically the same as Embodiment 1, and the symbol meanings are the same as Embodiment 1, and only the differences are listed below.

[0139] Table 5 and Table 6 show the design data of the compact telephoto lens 300 according to Embodiment 3 of the present invention.

[0140] 【table 5】

[0141]

[0142] Table 6 shows the aspheric data of each lens in the compact telephoto lens 300 according to the third embodiment of the present invention.

[0143] 【Table 6】

[0144]

[0145] Figure 11 A schematic structural diagram of the compact telephoto lens 300 is shown. In this embodiment, D1=5.228mm, D2=1.869mm, the blocking ratio is equal to 0.54, and the imaging performance is excellent.

[0146] In this embodiment, f1=-32.428, f2=3.746, f3=-17.025, f4=-2.348, f5=13.442, f6=211.356, f7=-8.173, R1 / R2=0.694, f5 / f2=3.588, f6 / f7=-25.860, which satisfies the conditional expressions in the first embodiment.

[0147] In this embodiment, the total optical ...

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PUM

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Abstract

The invention provides a compact telephoto lens. The compact telephoto lens sequentially comprises a diaphragm, a secondary lens and a primary lens from an object side to an image side, wherein the primary mirror comprises a first lens and a second lens, the secondary mirror comprises a third lens, the first lens and the third lens are Mangin lenses, an image side surface of the first lens is a reflecting surface, an object side surface of the third lens is a reflecting surface, the second lens is a transmitting mirror, light is reflected to the third lens through the first lens, the light isreflected to the second lens through the third lens, and the light is refracted to the image surface through the second lens to be imaged. The compact telephoto lens is provided with the light path composed of the first lens, the second lens and the third lens, the diffraction limit of the lens is improved, the long focal length is achieved, the structure is compact, and the size is small.

Description

technical field [0001] The invention relates to the field of optical lenses, in particular to a compact telephoto lens. Background technique [0002] In recent years, with the rise of smart phones, the demand for miniaturized photographic lenses has been increasing, and the photosensitive devices of general photographic lenses are nothing more than photosensitive coupling devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor devices (Complementary Metal -Oxide Semiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing process technology, the pixel size of photosensitive devices has been reduced, and today's electronic products are developing with good functions and thin, light and small appearance. Therefore, it has Miniaturized camera lenses with good imaging quality have become the mainstream in the current market. [0003] In order to obtain high image quality, the miniaturized photographic lens load needs to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/004G02B13/18
Inventor 田国兵
Owner RUITAI OPTICAL CHANGZHOU CO LTD