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Macro zoom optical system
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An optical system, macro technology, applied in the field of macro zoom optical system, can solve problems such as affecting the user's sensory effects
Active Publication Date: 2019-11-19
JIAXING ZHONGRUN OPTICAL TECH
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However, when the focal length of the zoom lens is increased, the F value will also increase synchronously, and the F value directly determines the illumination of the picture. Therefore, the brightness of the general lens will gradually decrease during the process of zooming from the wide-angle end to the telephoto end. Affect the user's sensory effect
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Embodiment 1
[0032] like figure 1 As shown, this embodiment includes in sequence from the object side to the image side: a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, and a third lens group G3 with positive refractive power. The fourth lens group G4 with positive refractive power and the light receiving surface IMG, wherein: the first lens group and the third lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a focusing group.
[0033] Between the fourth lens group G4 and the sensor IMG, there is a protective glass CG and an infrared cut-off filter IRCUT-ICF for filtering light of unnecessary wavelength bands and stray light.
[0034] The light-receiving surface IMG is provided with solid-state imaging elements such as CCD and CMOS.
[0035] The first lens group G1 includes in order from the object side: a first lens L1 with pos...
Embodiment 2
[0052] like Figure 4 As shown, compared with Embodiment 1, the first lens group G1 in this embodiment includes in order from the object side: the first lens L1 with positive refractive power, the second lens L2 with negative refractive power, and the second lens L2 with positive refractive power. The third lens L3 with positive refractive power, the fourth lens L4 with positive refractive power, wherein the second lens L2 is cemented with the third lens L3.
[0053] The second lens group G2 includes in order from the object side: a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power, and a seventh lens L7 with positive refractive power.
[0054]The third lens group G3 includes in order from the object side: an eighth lens L8 with positive refractive power, and a ninth lens L9 with negative refractive power, wherein the front surface of the eighth lens L8 is set as an aperture stop STP.
[0055] The fourth lens group G4 includes, in or...
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Abstract
The invention relates to a macro-zoom optical system, in particular to a macro-lens with an inner focusing structure. The macro-zoom optical system sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, and a light receiving surface from the object side to the image side; the first lens group and the third lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a focusing group; the second lens group is moved back and forth along the optical axis direction so as to realize zoom from the wide angle end to the telescope end; the fourth lens group is moved towards the object side along the optic axisdirection, so as to correct the soft focus due to zooming process and change of object distance. The macro-zoom optical system has the advantages that the glass with extra low dispersion is not contained, the weight is light, the size is small, the F value is constant in the zoom process from the wide angle end to the telescope end, and various aberrations can be well compensated in the whole-focus range.
Description
technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a macro zoom optical system that does not contain ultra-low dispersion glass, is light and compact, and can maintain a constant F value. Background technique [0002] Existing macro lenses usually achieve focusing on close-distance objects through the forward and backward expansion and contraction of the first lens group closest to the object side. Restricted by the light height and field of view, the front group lens is often the lens group with the largest aperture. Due to the telescopic focusing method of the front group, a large-volume high-magnetization motor must be used to ensure the automatic focusing speed. The focusing characteristics of the focus group make the size of the entire movement stroke must be able to accommodate a group of apertures, and the lens volume cannot be compressed; [0003] Because optical lenses have different refractive indices for...
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Application Information
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