Continuous zoom telecentric lens
A telecentric lens and lens technology, applied in optical components, optics, instruments, etc., can solve problems such as high cost, uncertainty, and subtle problems in the magnification system, and achieve the effects of cost saving, simple optical structure, and simple method.
Active Publication Date: 2020-07-10
SUZHOU LINGHOU ROBOT
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Problems solved by technology
[0003] However, in the existing products and technologies, the structure of the zoom telecentric lens is relatively complicated, which is manifested in the following two points: (1) the number of lenses is large (generally ≥14 pieces), and the number of lens groups is large (generally ≥4 group), resulting in higher cost; (2) The continuous zoom function is realized by the cooperation of the fixed lens group, the zoom group and the compensation group. Usually the moving steps of the zoom group and the compensation group are not consistent, which requires the cam Design two different curves on the above; if there are more zoom groups or compensation groups, multiple cam curves or multiple cam structures may be required; more complex zoom implementation methods will magnify the subtle problems of the system, resulting in more Uncertainty
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Embodiment 1
[0048] Such as figure 1 As shown, the present embodiment is sequentially from the object plane OBJ to the image plane IMA: the first single positive spherical lens 1, the second single positive spherical lens 2, the third single negative spherical lens 3, the fourth single negative spherical lens 4, the first single negative spherical lens Five single negative spherical lenses 5, the sixth single negative spherical lens 6, the seventh single negative spherical lens 7, the eighth single positive spherical lens 8 and the ninth single positive spherical lens 9, wherein the first single positive spherical lens 1, the first single positive spherical lens Two single positive spherical lenses 2 and the third single negative spherical lens 3 form lens group A, the second single positive spherical lens 2 and the third single negative spherical lens 3 are combined into a cemented lens, the fourth single negative spherical lens 4, the fifth single negative spherical lens The negative sph...
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The invention discloses a continuous zoom telecentric lens, and belongs to the technical field of machine vision. The continuous zoom telecentric lens sequentially comprises a lens group A with positive focal power, a lens group B with negative focal power, a system aperture diaphragm and a lens group C with positive focal power from an object plane to an image plane, wherein the lens group A comprises a first lens with positive focal power, a second lens with positive focal power and a third lens with negative focal power; the lens group B comprises a fourth lens with negative focal power, afifth lens with negative focal power and a sixth lens with negative focal power; the lens group C comprises a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with positive focal power; and the lens group A, the lens group C, the system aperture diaphragm and the image plane are fixed in position, and the whole lens group B can move back and forth relative to the system aperture diaphragm. The continuous zoom telecentric lens has the advantages of fewer lenses and groups, simple cam curve and the like.
Description
technical field [0001] The invention relates to a technology in the field of machine vision, in particular to a continuously zooming telecentric lens. Background technique [0002] In industrial inspection, it is sometimes necessary to use the same measurement system to measure objects of different sizes with high precision. At this time, neither the traditional fixed-focus lens nor the fixed-power telecentric lens can meet the demand. The zoom telecentric lens can not only continuously change the magnification to meet the requirements of different fields of view, but also its high resolution, low optical distortion and low telecentricity can also meet the measurement accuracy requirements. [0003] However, in the existing products and technologies, the structure of the zoom telecentric lens is relatively complicated, which is manifested in the following two points: (1) the number of lenses is large (generally ≥14 pieces), and the number of lens groups is large (generally ≥...
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IPC IPC(8): G02B13/22G02B13/00G02B15/15
CPCG02B13/22G02B13/009G02B13/005G02B15/15
Inventor 朱伟岸周师发李航宇
Owner SUZHOU LINGHOU ROBOT