Zoom lens
A zoom lens and lens technology, applied in the field of zoom lens, can solve the problems of small size, difficult to enlarge the imaging target surface, difficult to correct aberration, etc., and achieve the effect of high imaging quality, large aperture, day and night confocal aperture
Pending Publication Date: 2020-05-08
DONGGUAN YUTONG OPTICAL TECH
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AI Technical Summary
Problems solved by technology
The current zoom all-in-one camera generally has a total length of more than 50mm, which cannot achieve a small size
To reduce the size of the lens, it is difficult to correct the aberration and make the imaging target surface larger.
Method used
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[0061]The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0062] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. It should be noted that the orientation words such as "up", "down", "left", and "right" described in the embodiments of the present invention are described from the angles shown in the drawings, and should not be interpreted as a reference to the implementation of the present invention. Example limitations. Also in this context, it also need...
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Abstract
The embodiment of the invention discloses a zoom lens. The zoom lens comprises a focusing lens group, a diaphragm and a zoom lens group which are arranged from an object side to an image side along anoptical axis, wherein the focusing lens group and the zoom lens group reciprocate along the optical axis during zooming; the focusing lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power; the zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power; the first lens, the seventh lens and the eighth lens are spherical lenses, and the seventh lens and the eighth lens form a cemented lens; and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the ninth lensare aspheric lenses. According to the scheme, on the premise that TTL is smaller than or equal to 33 mm, the equivalent focal length ranges from 2.8 mm to 6 mm, and the effects of being high in imaging quality, large in aperture and confocal day and night are achieved.
Description
technical field [0001] Embodiments of the present invention relate to lens technology, and in particular to a zoom lens. Background technique [0002] Due to the fixed field of view of the fixed-focus lens, a product can only be used in specific scenarios, resulting in fixed-focus lenses that cannot meet the use requirements in many scenarios. Because the focal length of the zoom lens is continuously variable, the field of view is also continuously variable within a certain range, which can adapt to a variety of application scenarios. Therefore, the zoom all-in-one machine including the zoom lens has a wide range of security fields such as smart transportation and face recognition. Applications. [0003] Because the size of the zoom lens directly affects the volume of the entire camera. For occasions where the installation space is limited or where concealment is required, small-sized security zoom lenses have a wide range of demands. The current all-in-one zoom camera ge...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G02B15/177
CPCG02B15/177
Inventor 张磊张占军金永红
Owner DONGGUAN YUTONG OPTICAL TECH