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Small-size wide-angle zoom lens

A zoom lens, a small-sized technology, applied in the field of optical lenses, can solve the problems of inability to balance volume, performance, and cost, and achieve the effects of compact structure, reduced overall optical length, and high performance

Active Publication Date: 2015-10-07
DONGGUAN YUTONG OPTICAL TECH
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Problems solved by technology

Therefore, if an all-glass lens is used, a good balance cannot be achieved in terms of volume, performance, and cost.

Method used

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  • Small-size wide-angle zoom lens
  • Small-size wide-angle zoom lens
  • Small-size wide-angle zoom lens

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Experimental program
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Embodiment 1

[0061] The surface shape, radius of curvature, lens thickness, lens spacing, lens refractive index and K value of the 8 lenses of the lens, a total of 16 surfaces, respectively meet the following conditions:

[0062] Table 1: Physical parameters of the eight lenses.

[0063]

[0064] In the above table, "R" is the radius of curvature, "-" indicates that the direction is negative, and "PL" indicates a plane. If the serial number of the same surface in the above table has both refractive index data n and data D, the data D indicates the lens axis The thickness at the center line, if the serial number of the same plane only has data D but no refractive index data n, the data D represents the distance from the lens to the next lens plane.

[0065] Wherein the shape of the 7th, 8th, 9th, 10th, 11th, 12th, 15th and 16th surfaces with aspherical surface structure can be expressed by the following formula:

[0066]

[0067] where C=1 / R

[0068] Table 2: Aspheric parameters of ...

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Abstract

The invention belongs to the technical field of optical lenses, and particularly relates to a small-size wide-angle zoom lens. The small-size wide-angle zoom lens comprises a zooming group and a compensation group, wherein the total focal power of the zooming group is positive, and the total focal power of the compensation group is negative; the compensation group comprises a first lens, a second lens and a third lens which are sequentially arranged from the object side; the zooming group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from the object side; and the fourth lens, the fifth lens, the sixth lens and the eighth lens are plastic aspherical lenses. Compared with the prior art, the zoom lens provided by the invention adopts a mixture of glass spherical lenses and the plastic aspherical lenses, because an aspheric surface has a higher aberration correction ability and can achieve higher performance, and the cost of an optical plastic material is far lower than that of optical glass. Therefore, perfect balance of size, performance and cost can be achieved by adopting the structure of mixing the glass lenses and the plastic aspherical lenses.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, in particular to a small-sized wide-angle zoom lens. Background technique [0002] In the field of security, the zoom lens is widely used because of its variable focal length and the ability to obtain pictures of various magnifications according to people's needs. [0003] With the development of science and technology, the volume of various electronic components is getting smaller and smaller, which also drives the development of the security industry to miniaturization. As the core component of the security camera imaging system, the size of the security lens directly determines the overall size of the camera. At present, the total optical length of mainstream zoom lenses is usually more than 53mm, and the volume is relatively large, which does not meet the requirements of miniaturization. [0004] Generally speaking, under the premise of the same imaging performance requirements, a le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/15
CPCG02B15/15
Inventor 张品光刘官禄何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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