阅读说明：本技术 显微镜管镜 (Microscope tube mirror ) 是由 末永豊 赵跃东 于 2019-09-23 设计创作，主要内容包括：本专利提供了一种显微镜管镜,它采用复消色差管镜的设计,和物镜配合使用,能在所使用的波长带宽全部具有出色的平坦性,可以拥有从中心到边缘的全部为鲜锐的画面图像。其从物方侧开始依次,包括至少有一枚正折射力的透镜和一枚负折射力的透镜的第1透镜组IG1,至少有一枚正折射力透镜的第2透镜组IG2和至少有一枚正折射力的透镜和一枚负折射力的透镜,整体是负折射力的第3透镜组IG3,将从所述第1透镜组IG1的最靠近所述物方侧的透镜面到出瞳面的距离设为Lp,将整个焦距设为fIm时,满足：－5.0＜Lp/fIm＜－0.5。(The patent provides a microscope tube lens, it adopts apochromatism tube lens's design, uses with objective cooperation, can all have outstanding planarization at the wavelength bandwidth that uses, can possess from the center to the edge all for sharp picture image. The optical lens system comprises a 1 st lens group IG1 which comprises at least one lens with positive refractive power and one lens with negative refractive power, a 2 nd lens group IG2 which comprises at least one lens with positive refractive power, at least one lens with positive refractive power and one lens with negative refractive power, and a 3 rd lens group IG3 which is negative refractive power as a whole, wherein the distance from the lens surface, closest to the object side, of the 1 st IG lens group 1 to the exit pupil surface is Lp, and the whole focal length is fIm, the optical lens system meets the following requirements: -5.0 < Lp/fIm < -0.5.)

1. microscope tube mirror, characterized by: the objective lens comprises, in order from the object side, a 1 st lens group (IG1) including at least one positive refractive power lens and one negative refractive power lens, a 2 nd lens group (IG2) including at least one positive refractive power lens, and at least one negative refractive power lens, and the entire objective lens is a negative refractive power 3 rd lens group (IG3), and the objective lens satisfies the following requirements when the distance from the lens surface closest to the object side of the 1 st lens group (IG1) to the exit pupil surface is Lp and the entire focal length of the microscope tube is fIm:

－5.0＜Lp/fIm＜－0.5 (1)。

2. The microscope tube lens of claim 1, wherein: the 1 st lens group (IG1) is a cemented lens composed of 2 lenses, at least one positive refractive power lens of the 1 st lens group (IG1) has a refractive index nd of 1.61 or less and an Abbe number of 65 or more.

3. The microscope tube lens of claim 1, wherein: when the focal length of the 1 st lens group (IG1) is f21 and the focal length of the 2 nd lens group (IG2) is f22, the following conditions are satisfied:

0.03＜|fIm/f21|＜0.85 (2)

0.70＜|fIm/f22|＜2.00 (3)。

4. The microscope tube lens of claim 1, wherein: when the focal length of the 3 rd lens group (IG3) is f23, the following are satisfied:

－2.0＜f23/fIm＜－0.5 (4)。

Technical Field

this patent relates to microscope imaging systems, and in particular, to tube lenses for microscopes.

Background

For a microscope imaging system, when an infinite microscope objective lens is used, parallel light comes out of the objective lens, and cannot be imaged, and tube lens convergence is needed for imaging. The traditional tube lens has overlarge residual aberration in the aspect of aberration correction, particularly a secondary spectrum, and when an apochromatic high-end objective lens with a large numerical aperture is used, if the residual aberration of the tube lens is overlarge, the resolving and resolving capability of the objective lens cannot be embodied, and perfect imaging cannot be obtained.

Disclosure of Invention

the patent provides a microscope tube lens, it adopts apochromatism tube lens's design, uses with objective cooperation, can all have outstanding planarization at the wavelength bandwidth that uses, can possess from the center to the edge all for sharp picture image.

The technical scheme adopted by the patent is as follows:

in order to achieve the above object, a 1 st lens group IG1 including at least one positive refractive power lens and one negative refractive power lens, a 2 nd lens group IG2 including at least one positive refractive power lens, and at least one negative refractive power lens, and a 3 rd lens group IG3 having a negative refractive power as a whole, in this order from the object side, a distance from a lens surface closest to the object side of the 1 st lens group IG1 to an exit pupil surface is Lp, and a total focal length is fIm, the following condition (1) is satisfied:

－5.0＜Lp/fIm＜－0.5 (1)

The 1 st lens group IG1 mainly corrects chromatic aberration, and the 2 nd lens group IG2 corrects spherical aberration, coma, astigmatism, distortion and the like, so that the purpose of well correcting field curvature and chromatic aberration of the tube lens is achieved.

the condition (1) is a condition for specifying an appropriate position state of the tube lens. If the upper limit of the condition (1) is exceeded, the size of the entire microscope device becomes too long, which is not preferable. Further, if the distance is less than the lower limit of the condition (1), the distance between the tube lens and the objective lens is too close, and the application of the object that can be used is limited, and the versatility of the tube lens is not good.

The 1 st lens group IG1 is preferably a cemented lens composed of 2 lenses, and the 1 st lens group IG1 preferably has at least one positive refractive power lens having a refractive index nd of 1.61 or less and an abbe number of 65 or more. With such a configuration, chromatic aberration can be corrected satisfactorily.

It is preferable that the following conditions (2) and (3) are satisfied when the focal distance of the 1 st lens group IG1 is f21 and the focal distance of the 2 nd lens group IG2 is f 22.

0.03＜|fIm/f21|＜0.85 (2)

0.70＜|fIm/f22|＜2.00 (3)

If the refractive power falls below the lower limit of the condition (2), the refractive power of the 1 st lens group IG1 becomes too large, and is not changed from the performance of the conventional tube mirror, which is not preferable. When the upper limit of the condition (2) is exceeded, the refractive power of the 1 st lens group IG1 is too small to contribute to aberration correction, and is not appropriate.

If the value falls below the lower limit of the condition (3), the refractive power of the 2 nd lens group IG2 becomes too large, the refractive power of the 1 st lens group IG1 becomes small, and the aberrations deteriorate, which is not preferable. If the refractive power of the 2 nd lens group IG2 exceeds the upper limit of the condition (3), the refractive power is too small, and the refractive power of the 1 st lens group IG1 is large, so that the aberration correction state is the same as that of the conventional tube lens, which is not preferable.

When the focal length of the 3 rd lens group IG3 is f23, it is preferable that the following condition (4) is satisfied.

－2.0＜f23/fIm＜－0.5 (4)

the condition (4) is a condition for defining an appropriate refractive power arrangement. If the upper limit and the lower limit of the condition (4) are exceeded, each aberration cannot be corrected satisfactorily, which is not preferable.

The beneficial effect of this technique: the microscope tube mirror has excellent flatness over the entire wavelength band used, and can provide clear images in the middle and peripheral portions of the screen.

Drawings

FIG. 1 is a view showing a tube mirror according to the embodiment of this patent 1. In the figure, the 1 st lens group 1G1(L1, L2), the 2 nd lens group 1G2(L3), and the 3 rd lens group 1G3(L3, L4).

Fig. 2 is an aberration diagram.

Fig. 2(a) is a spherical aberration diagram, in which the vertical axis represents the relative incident height and the horizontal axis represents the aberration amount. The g line at 436nm is denoted g, the F line at 486nm is denoted F, the d line at 588nm is denoted d, and the C line at 656nm is denoted C.

Fig. 2(B) shows the astigmatic aberration, with the vertical axis representing the incident angle and the horizontal axis representing the aberration amount, the solid line the meridional image plane (M), and the broken line the sagittal image plane (S).

Fig. 2(C) is a distortion aberration diagram, in which the vertical axis is an incident angle and the horizontal axis represents a distortion aberration amount in percentage.

FIG. 3 is a view showing a tube mirror according to the embodiment of this patent 2. In the figure, the 1 st lens group 1G1(L1, L2), the 2 nd lens group 1G2(L3), and the 3 rd lens group 1G3(L3, L4).

Fig. 4 is an aberration diagram.

Fig. 4(a) is a spherical aberration diagram, in which the vertical axis represents the relative incident height and the horizontal axis represents the aberration amount. The g line at 436nm is denoted g, the F line at 486nm is denoted F, the d line at 588nm is denoted d, and the C line at 656nm is denoted C.

fig. 4(B) shows the astigmatic aberration, with the vertical axis representing the incident angle and the horizontal axis representing the aberration amount, the solid line the meridional image plane (M), and the broken line the sagittal image plane (S).

Fig. 4(C) is a distortion aberration diagram, in which the vertical axis is an incident angle and the horizontal axis represents a distortion aberration amount in percentage.

FIG. 5 is a view showing a tube mirror according to the embodiment of this patent 3. In the figure, the 1 st lens group 1G1(L1, L2), the 2 nd lens group 1G2(L3), and the 3 rd lens group 1G3(L3, L4).

Fig. 6 is an aberration diagram.

fig. 6(a) is a spherical aberration diagram, in which the vertical axis represents the relative incident height and the horizontal axis represents the aberration amount. The g line at 436nm is denoted g, the F line at 486nm is denoted F, the d line at 588nm is denoted d, and the C line at 656nm is denoted C.

Fig. 6(B) shows the astigmatic aberration, with the vertical axis representing the incident angle and the horizontal axis representing the aberration amount, the solid line the meridional image plane (M), and the broken line the sagittal image plane (S).

Fig. 6(C) is a distortion aberration diagram, in which the vertical axis is an incident angle and the horizontal axis represents a distortion aberration amount in percentage.

Detailed Description