25x Long Working Distance Plan Achromat Objective
An achromatic objective lens and working distance technology, applied in the field of optical components, can solve the problems of unsatisfactory imaging quality and inability to image clearly, and achieve the effects of easy advanced spherical aberration, long working distance, and improved optical performance.
Active Publication Date: 2017-07-07
WUZHOU OKA OPTICAL INSTR
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[0003] The purpose of the present invention is to provide a 25 times long working distance plan achromatic objective lens, which can solve the problem that the existing 25 times long working distance plan achromatic objective lens has unsatisfactory imaging quality and cannot be obtained in the entire field of view. sharp image problem
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[0015] The present invention will be described in further detail below in conjunction with accompanying drawing embodiment:
[0016] figure 1 The optical system of the 25x long working distance plan achromat objective shown includes a positive lens group G1 with positive dioptric power and a negative lens group G2 with negative dioptric power arranged in sequence along the optical axis from the object space to the image space, and the positive lens Group G1 and negative lens group G2 form a telephoto system, which can move the main object side towards the object forward to obtain a larger working distance; the positive lens group G1 is composed of the first lens L1, Composed of the second lens L2 and the third lens L3, the negative lens group G2 is a fourth lens L4.
[0017] The first lens L1 is a positive meniscus lens with positive refractive power, the concave surface of the positive meniscus lens with a larger radius of curvature faces the object side, that is, the surfac...
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The invention discloses a 25 times long working distance plan achromatic objective lens, which relates to the technical field of optical elements, and comprises a positive lens group of positive refractive power and a lens group of negative refractive power arranged in sequence along the optical axis from the object side to the image side The negative lens group, the positive lens group and the negative lens group form a telephoto system, the surface of the positive lens group closest to the object side forms a concave surface facing the object side, and meets the following conditions: 6.5mm<f<7mm , 5 mm<|fG2 / fG1|<6.1 mm, 3 mm<|R1| / d0<3.6 mm, where f is the focal length of the objective lens, fG1 is the focal length of the positive lens group, and fG2 is the negative lens group The focal length, R1 is the radius of the concave surface, d0 is the working distance of the objective lens. Compared with the prior art, the present invention has very good optical performance of the lens, clear imaging can be obtained in the whole field of view, and ideal imaging quality can be obtained.
Description
technical field [0001] The invention relates to the technical field of optical elements, in particular to a plan achromatic objective lens with a 25 times long working distance for an inverted biological microscope. Background technique [0002] The objective lens is an important optical part of the microscope. It uses light to magnify the observed object into the first image, thus directly related to and affects the quality of the image. Microscope objective lenses are divided into achromatic objective lenses, apochromat objective lenses, plan achromatic objective lenses and catadioptric objective lenses according to different uses. Achromatic objective lenses are objective lenses that correct axial chromatic aberration for two spectral lines. It corrects spherical aberration in the paraxial region. , coma and positional chromatic aberration, but the edge image quality is poor, while the plan achromatic objective lens is a good correction achromatic objective lens for field...
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IPC IPC(8): G02B21/02
Inventor 张景华
Owner WUZHOU OKA OPTICAL INSTR