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In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system.
Zoom lens and imaging device
The application relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens is sequentially composed of a fixed lens group with positive focal length, a first variable magnification lens group with negative focal length, a diaphragm, a second variable magnification lens group with positive focal length, a focusing lens group with negative focal length and a third variable magnification lens group with positive focal length from the object plane side to the image plane side; the zoom lens satisfies the following conditional expressions: TTL < 95 mm; ft / fw > 25; wherein TTL is the total optical length of the zoom lens, ft is the focal length of the zoom lens in a telephoto state, and fw is the focal length of the zoom lens in a wide-angle state. The zoom lens can realize a large zooming range under a small volume, and the coma of the zoom lens is reduced and the imaging quality of the zoom lens is increased through the arrangement of multiple variable magnification lens groups.
Owner:JIAXING ZHONGRUN OPTICAL TECH