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external lens

An external lens and lens technology, used in optical components, optics, instruments, etc., can solve the problems of low pixels of external lenses, blurred images around, small field of view, etc., to improve the resolution ability, increase the field of view, The effect of increasing the shooting range

Active Publication Date: 2020-05-15
JIANGXI LIANCHUANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although most external lenses have increased the original focal length of the lens of the electronic device, the field of view is relatively small, and when shooting, the center of the image taken is clear, but the periphery of the image is blurred; and the existing external lens The pixels are too low to match the imaging devices with high pixels

Method used

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Examples

Experimental program
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no. 1 example

[0067] For a structural schematic diagram of an external lens 100 provided in this embodiment, please refer to figure 1 , the extension lens 100 includes in order from the object side to the imaging surface: a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 and an aperture stop ST.

[0068] The first lens L1 has negative refractive power, the object side S1 of the first lens is convex, the image side S2 of the first lens is concave, and the first lens L1 is a glass spherical lens.

[0069] The second lens L2 has negative refractive power, the object side S3 of the second lens and the image side S4 of the second lens are concave, and the second lens L2 is a glass spherical lens. In some embodiments, the second lens L2 may also be a glass aspherical lens.

[0070] The third lens L3 has positive refractive power, the object side S5 of the third lens is convex, the image side S6 of the third lens is concave, and the third lens L3 is a glass spherical lens. ...

no. 2 example

[0077] For a structural schematic diagram of an external lens 200 provided in this embodiment, please refer to figure 2 . The structure of the extension lens 200 in this embodiment is roughly the same as the structure of the extension lens 100 in the first embodiment, the difference is that: the object side surface S3 of the second lens of the extension lens 200 in this embodiment is a convex surface, the second lens The third lens L3 is a glass aspheric lens, the image side S8 of the fourth lens is convex, and the curvature radius and material selection of each lens are different.

[0078] The relevant parameters of each lens in the extension lens 200 provided in this embodiment are shown in Table 2.

[0079] Table 2

[0080]

[0081] The parameters of each lens aspheric surface in this embodiment are shown in Table 3.

[0082] table 3

[0083]

no. 3 example

[0085] For a structural schematic diagram of an external lens 300 provided in this embodiment, please refer to image 3 . The structure of the extension lens 300 in this embodiment is roughly the same as the structure of the extension lens 100 in the first embodiment, except that the image side S8 of the fourth lens of the extension lens 300 in this embodiment is a concave surface, and The radius of curvature and material selection of each lens are different.

[0086] The relevant parameters of each lens in the extension lens 300 provided in this embodiment are shown in Table 4.

[0087] Table 4

[0088]

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Abstract

The invention provides an external lens. The external lens is mounted on the object side of the lens of an imaging device. The external lens sequentially includes a first lens, a second lens, a third lens, a fourth lens and an aperture stop from the object side to the imaging surface. The first lens has negative refractive power, its object side is convex, and the image side is concave; the second lens has negative refractive power, and its image side is concave; the third lens has positive refractive power, and its object side is convex; The four lenses have positive refractive power, and the object side is convex; wherein, the total optical length TTL of the external lens and the maximum aperture D of the external lens satisfy the conditional formula: 0.5<TTL / D<1. The external lens provided by the present invention increases the viewing angle of the lens on the premise of ensuring the imaging quality of the original lens, effectively increasing the shooting range of the original lens, and its viewing angle range can reach more than 190°, and can realize a 360-degree ultra-wide angle Panoramic picture shooting, while increasing the depth of field range of the original lens, providing a panoramic high-definition shooting effect.

Description

technical field [0001] The invention relates to the technical field of lens imaging, in particular to an external lens. Background technique [0002] With the continuous advancement of technology, portable electronic devices are constantly developing in the direction of intelligence, miniaturization, and touch screen, integrating entertainment, photography, live broadcast and other functions, and various applications greatly meet the needs of users. In recent years, with the rise of panoramic photography and live broadcasting, people have become very interested in the effect of ultra-wide-angle photography. However, most of the lenses mounted on electronic imaging devices such as mobile phones, sports cameras, and DV cameras have a small field of view , this kind of lens with a small field of view cannot achieve the shooting effect of a super large field of view alone, so that the current electronic equipment with a small field of view basically uses software algorithms to p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18G02B13/06G02B1/00
CPCG02B1/00G02B13/004G02B13/06
Inventor 魏文哲刘绪明曾吉勇
Owner JIANGXI LIANCHUANG ELECTRONICS CO LTD
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