A kind of lens system and lens
A lens system and lens technology, applied in the field of optical instruments, can solve problems such as the inability to meet high-definition screen display requirements, and achieve the effects of improving product performance stability, reducing system chromatic aberration, and relatively low prices
Active Publication Date: 2019-05-21
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology
[0005] The invention provides a lens system and a lens to solve the problem that the prior art cannot meet the requirements of high-definition image display
Method used
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[0052] An embodiment of the present invention provides a lens system, which includes sequentially from the object side to the image side along the optical axis: a first lens group, a second lens group, an aperture stop and a third lens group; the refractive power of the first lens group is Negative; the second lens group has positive refractive power, and includes in turn from the object side to the image side along the optical axis: the first subgroup with positive refractive power and the first biconvex lens with positive refractive power; the third lens group light The power is positive, along the optical axis from the object side to the image side, including: the second biconvex lens with positive power, the first biconcave lens with negative power, and the second subgroup with positive power ; The second biconvex lens is glued together with the first biconcave lens.
[0053] In this lens system, the first lens group can allow light with a large field of view to enter the ...
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The invention relates to the field of optical instruments, in particular to a lens system and a lens, so that a problem that the high-definition picture display requirement can not be met in the prior art can be solved. A first lens group, a second lens group, an aperture and a third lens group are arranged successively along an optical axis from an object side to an image side. The focal power of the first lens group is negative; and the focal power of the second lens group is positive. The second lens group includes a first sub group with the positive focal power and a first biconvex lens. The third lens group with the positive focal power consists of a second biconvex lens, a first biconcave lens, and a second sub group with the positive focal power that are arranged along the optical axis from the object side to the image side. The second biconvex lens and the first biconcave lens are bound together. According to the lens system, the coma and the field curvature of the system can be balanced; the spherical aberration and astigmatism of the system can be corrected effectively; and the emergence angle of the main light of the system can be reduced and thus the image plane illuminance uniformity and color reduction degree are enhanced.
Description
technical field [0001] The invention relates to the field of optical instruments, in particular to a lens system and a lens. Background technique [0002] With the development of high-definition image presentation technology, 1080P high-definition images can no longer meet people's needs, and 4K technology has emerged as the times require; in recent years, technological innovations and breakthroughs in data transmission technology, data storage technology, image processing technology, and high-definition TV display technology , making it possible to achieve ultra-high-definition images with 4K resolution, and will become a future development trend; this requires the lens (lens system) to have a higher resolution to meet the imaging requirements of 4K cameras. [0003] With the improvement of lens processing technology and the improvement of optical material performance, the lens system has been greatly developed, but the resolution level of the existing lens systems and lens...
Claims
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IPC IPC(8): G02B13/00
Inventor 刘凯王丰丁洪兴张兴明
Owner ZHEJIANG DAHUA TECH CO LTD