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Object lens of microscope

A microscope objective lens and lens group technology, applied in the microscope field, can solve the problems of excessive thickness and refractive index changes, affecting the quality of microscope imaging, etc., and achieve the effect of clear imaging

Active Publication Date: 2015-12-09
NINGBO SUNNY INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness and refractive index of the medium change too much, it will affect the quality of microscope imaging

Method used

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  • Object lens of microscope
  • Object lens of microscope
  • Object lens of microscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] see figure 1 , the microscope objective lens of Example 1 of the present invention includes first lens L1 with positive refractive power, first lens group G1 with positive refractive power, second lens group G5 with positive refractive power, and negative optical power from the object side. The third lens group G2 with power, the fourth lens group G3 with negative refractive power, and the fifth lens group G4 with negative refractive power. The first lens group G1 is used to move along the optical axis of the objective lens to change the focal length of the objective lens.

[0057]When in use, the specimen is set on the object side S1 of the medium O (such as a cover glass), and the light reflected by the specimen is projected on the image plane S2 of the medium O, and then enters the microscope objective lens and the tube lens arranged on the side of the microscope objective mirror into the observer’s on the eye or image sensor (not shown). When measuring different s...

Embodiment 2

[0104] Please refer to Image 6 The microscope objective lens in Example 2 of the present invention is basically the same as the microscope objective lens in Example 1, but the fifth lens group G4 of the microscope objective lens in Example 2 includes a fourth lens L4, and correspondingly, the surface number of the microscope objective lens changes.

[0105] In addition, in Example 2, the microscope objective lens meets the conditions of the following table:

[0106] table 3

[0107] the surface

Radius (mm)

Thickness (mm)

Nd

Vd

S1

infinity

D1

1.52

64.2

S2

infinity

D2

S3

-2.1

0.4

1.82

60

S4

-0.98

D3

S5

-225

0.111

158

57.1

S6

1.365

0.443

1.52

70

S7

-2.86

D4

S8

3.73

0.3

1.43

95

S9

-2.16

0.022

S10

3.19

0.3

1.43...

Embodiment 3

[0117] Please refer to Figure 11 The microscope objective lens in Example 3 of the present invention is basically the same as the microscope objective lens in Example 1, but the second lens group G5 of the microscope objective lens in Example 3 includes the second lens L2, and correspondingly, the surface number of the microscope objective lens changes.

[0118] In addition, in embodiment 3, the microscope objective lens satisfies the condition of the following table:

[0119] table 5

[0120] the surface

Radius (mm)

Thickness (mm)

Nd

Vd

S1

infinity

D1

1.52

64.2

S2

infinity

D2

S3

-2.1

0.462

1.73

52.3

S4

-0.98

D3

S5

-4.275

0.11

1.57

58.8

S6

1.469

0.44

1.49

85.2

S7

-1.94

D4

S8

2.55

0.55

1.7

57.7

S9

-2.9

.022

S10

1.4...

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PUM

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Abstract

The invention discloses an object lens of a microscope. The object lens successively comprises a first lens positive in focal power, a first lens unit positive in focal power, a second lens unit positive in focal power, a third lens unit negative in focal power, a fourth lens unit negative in focal power and a fifth lens unit negative in focal power from the object side. The first lens unit is used for moving along an optical axis of the object lens of the microscope so as to change the focal length of the object lens of the microscope. According to the invention, by moving the first lens unit, the focal length of the object lens of the microscope can be changed, thereby compensating the thickness of covering media and the refractive index change to obtain a clear image.

Description

technical field [0001] The invention relates to microscope technology, in particular to a microscope objective lens. Background technique [0002] At present, when using a microscope to observe a specimen, the specimen is generally covered with a medium such as a cover glass, a petri dish or a specific liquid, that is to say, a medium is set between the specimen and the objective lens of the microscope. In this way, the specimen is projected onto the upper surface of the medium and imaged under magnification through the microscope. Since the microscope generally has a fixed focal length, the thickness and refractive index of the medium also need to be fixed. Of course, depending on the magnification and numerical aperture of the microscope objective lens, the thickness and refractive index of the medium can vary slightly. However, if the thickness and refractive index of the medium change too much, it will affect the quality of microscope imaging. The higher the magnifica...

Claims

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Application Information

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IPC IPC(8): G02B21/02G02B13/00
Inventor 李伸朋
Owner NINGBO SUNNY INSTR
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