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CN-122018131-A - Microscope objective

CN122018131ACN 122018131 ACN122018131 ACN 122018131ACN-122018131-A

Abstract

The application relates to a microscope objective lens, which comprises a first lens group, a second lens group and a third lens group, wherein the first lens group, the second lens group and the third lens group are sequentially arranged from an object end to an image end along the optical axis direction. A lens combination is formed by a first lens group with positive focal power, a second lens group with positive focal power and a third lens group with negative focal power, wherein the second lens group and the third lens group at least comprise 1 positive focal power lens with Abbe number larger than 80. The third lens group adopts negative focal power, can reasonably correct the light rays transmitted by the first two groups of lenses, compensate the offset of the light rays at the lower edge of a large visual field, effectively enlarge the effective imaging visual field of the objective lens, and the second lens group and the third lens group are introduced with high Abbe number positive focal power lenses, thereby solving the problems of easy aberration, imaging blurring and the like of the large visual field and long working distance. Therefore, the microscope objective can improve imaging quality under the requirement of a large field of view, and meets the requirement of a digital imaging technology on the microscope objective.

Inventors

  • BIAN XIAODONG
  • DING XUJIAN

Assignees

  • 江苏西励科技有限公司

Dates

Publication Date
20260512
Application Date
20260407

Claims (10)

  1. 1. A microscope objective lens, characterized by comprising, in order from an object end to an image end along an optical axis: A first lens group (100), the first lens group (100) having a positive optical power; a second lens group (200), wherein the second lens group (200) has positive focal power, and the second lens group (200) at least comprises 1 positive focal power lens with Abbe number larger than 80; And a third lens group (300), wherein the third lens group (300) has negative focal power, and at least 1 positive focal power lens with Abbe number larger than 80 is contained in the third lens group (300).
  2. 2. The microscope objective according to claim 1, characterized in that the second lens group (200) comprises, in order from the object end to the image end in the optical axis direction, a second lens (2) having positive optical power and a third lens (3) having positive optical power.
  3. 3. A microscope objective according to claim 2, characterised in that the second lens (2) is a single lens and the third lens (3) is a cemented lens.
  4. 4. A microscope objective according to claim 1, characterized in that the third lens group (300) comprises, in order from the object end to the image end in the direction of its optical axis, a fourth lens (4) having positive optical power and a fifth lens (5) having negative optical power.
  5. 5. The microscope objective according to claim 4, wherein the fourth lens (4) is a cemented doublet comprising a first surface (41), a second surface (42) and a third surface (43), the third surface (43) being located at a side thereof near the image end.
  6. 6. The objective lens according to claim 5, wherein the fifth lens (5) is a cemented lens comprising a fourth surface (51), a fifth surface (52) and a sixth surface (53), the fourth surface (51) being located at a side thereof near the object end.
  7. 7. The micro objective according to claim 1, wherein the first lens group (100) comprises a first lens (1), the first lens (1) is a triple cemented lens, and the spherical centers of two cemented surfaces of the first lens (1) are located at one side close to the object end.
  8. 8. The microscope objective according to any one of claims 1 to 7, wherein the microscope objective satisfies: 1<f2/f<4; -15<f3/f<-5; f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f is the focal length of the microscope objective.
  9. 9. The microscope objective of claim 8, wherein the microscope objective satisfies: 4<f1/f<7; f1 is a focal length of the first lens group.
  10. 10. The microscope objective of claim 8, wherein the microscope objective satisfies: 3<TTL/f<8; TTL is the total optical length of the microscope objective.

Description

Microscope objective Technical Field The application belongs to the technical field of optics, and particularly relates to a microscope objective. Background The traditional microscope system takes human eye observation as a core, and the size of the field of view of the image space needs to be adapted to the optimal observation angle of the human eye, and is usually not more than ⌀ 26.5.5 mm. With the continuous development of digital imaging technology, the market has set more comprehensive and accurate requirements for collecting specimen detail information, and the conventional microscope system is limited by the field bottleneck, so that the requirements are difficult to meet. Aiming at the pain point, the related improvement of the prior art does not point to a technical route for expanding the field of view, and fails to break through the inherent bottleneck of the traditional design, and even if few schemes for attempting to expand the field of view of the microscope objective lens exist, the problem of poor imaging effect exists, and the core problem of limited field of view cannot be fundamentally solved. Disclosure of Invention The technical problem to be solved by the invention is to solve the defect that a microscope objective in the prior art requires a scene with a large field of view, so as to provide the microscope objective. The technical scheme adopted for solving the technical problems is as follows: a microscope objective comprising, in order from an object end to an image end along an optical axis: a first lens group having positive optical power; a second lens group, wherein the second lens group has positive focal power, and at least comprises 1 positive focal power lens with Abbe number larger than 80; The third lens group has negative focal power, and at least comprises 1 positive focal power lens with Abbe number larger than 80. Preferably, the microscope objective of the present invention, the second lens group includes, in order from the object end to the image end in the optical axis direction, a second lens having positive optical power and a third lens having positive optical power. Preferably, the microscope objective of the present invention, the second lens is a single lens, and the third lens is a cemented lens. Preferably, the microscope objective of the present invention, the third lens group includes, in order from an object end to an image end along an optical axis direction thereof, a fourth lens having positive optical power and a fifth lens having negative optical power. Preferably, the fourth lens is a cemented lens, and comprises a first surface, a second surface and a third surface, wherein the spherical center of the third surface is located at one side of the third surface near the image end. Preferably, the objective lens of the present invention is a cemented lens, and the fifth lens comprises a fourth surface, a fifth surface and a sixth surface, and the spherical center of the fourth surface is located at a side close to the object end. Preferably, in the microscope objective of the present invention, the first lens group includes a first lens, the first lens is a triple cemented lens, and spherical centers of two cemented surfaces of the first lens are located at a side close to the object end. Preferably, the microscope objective of the present invention, which satisfies: 1<f2/f<4; -15<f3/f<-5; f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f is the focal length of the microscope objective. Preferably, the microscope objective of the present invention, which satisfies: 4<f1/f<7; f1 is a focal length of the first lens group. Preferably, the microscope objective of the present invention, which satisfies: 3<TTL/f<8; TTL is the total optical length of the microscope objective. The invention has the beneficial effects that a lens combination is formed by a first lens group with positive focal power, a second lens group with positive focal power and a third lens group with negative focal power, wherein the second lens group and the third lens group at least comprise 1 positive focal power lens with Abbe number larger than 80. The third lens group adopts negative focal power, can reasonably correct the light rays transmitted by the first two groups of lenses, compensate the offset of the light rays at the lower edge of a large visual field, effectively enlarge the effective imaging visual field of the objective lens, and the second lens group and the third lens group are introduced with high Abbe number positive focal power lenses, thereby solving the problems of easy aberration, imaging blurring and the like of the large visual field and long working distance. Therefore, the microscope objective can improve imaging quality under the requirement of a large field of view, and meets the requirement of a digital imaging technology on the microscope objective. Drawings The technical scheme of the application is