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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: 2020-01-17
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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Effect test

no. 1 example

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

[0068] The first lens L1 has negative refractive power, the object side surface S1 of the first lens is convex, the image side surface 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 surface S3 of the second lens and the image side surface S4 of the second lens are both concave, and the second lens L2 is a glass spherical lens. In some embodiments, the second lens L2 may also be a glass aspheric lens.

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

no. 2 example

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

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

[0079] Table 2

[0080]

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

[0082] table 3

[0083]

no. 3 example

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

[0086] The related parameters of each lens in the external 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 arranged in the object side of a lens of imaging equipment, and comprises a first lens, a second lens, a third lens, a fourth lens and anaperture diaphragm sequentially from the object side to an imaging surface. The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the total optical lengthTTL of the external lens and the maximum aperture D of the external lens meet the conditional expression that TTL / D is greater than 0.5 and lower than 1. According to the external lens provided by theinvention, the field angle of the lens is increased on the premise that the imaging quality of the original lens is guaranteed; the shooting range of the original lens is effectively increased, the field angle range of the original lens can reach 190 degrees or above, 360-degree ultra-wide-angle panoramic picture shooting can be achieved, the depth-of-field range of the original lens is increased, and the panoramic high-definition shooting effect is provided.

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 science and technology, portable electronic devices are constantly developing in the direction of intelligence, miniaturization, and touch screen, integrating entertainment, camera, live broadcast and other functions. 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 effects of ultra-wide-angle photography. However, most of the lenses mounted on mobile phones, sports cameras, DV cameras and other electronic imaging devices have a small field of view. , This kind of small field of view lens cannot achieve the super-large field of view shooting effect alone, so that the current small field of view electronic equipment basically uses software algorithms to post-processing to ach...

Claims

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Application Information

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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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