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Multifocal lens for Gleanor type stereomicroscope

A technology of stereo microscope and zoom lens, which is applied in the field of zoom lens, can solve problems such as complex structures, and achieve the effect of simple lens structure, simple structure, and good correction of aberrations

Inactive Publication Date: 2007-07-11
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the complex structure

Method used

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  • Multifocal lens for Gleanor type stereomicroscope
  • Multifocal lens for Gleanor type stereomicroscope
  • Multifocal lens for Gleanor type stereomicroscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] f2 / f1=-0.36

[0028] S r d nd Vd

[0029] OBJ ∞ d1 1.

[0030] 1 75.4364 4.2020 1.61342 57.41

[0031] 2 -21.6674 1.5000 1.74000 31.71

[0032] 3 -51.1043 d2 1.

[0033] 4 -29.7007 2.6097 1.55232 63.75

[0034] 5 19.4969 2.0102 1.

[0035] 6 -30.5281 1.4122 1.66446 35.81

[0036] 7 11.3971 2.8230 1.72825 28.46

[0037] 8 -46.9320 d3 1.

[0038] 9 46.4210 1.8379 1.74000 28.29

[0039] 10 20.2713 5.0030 1.55963 61.17

[0040] 11 -38.1889 233.9110 1.

[0041] IMG ∞

[0042] 1st state 2nd state 3rd state

[0043] Focal length 96.8789 122.2828 54.3088

[0044] d1 177.3610 134.9995 118.6715

[0045] d2 1.0000 50.0364 79.7689

[0046] d3 20.5794 13.9045 0.5000

Embodiment 2

[0048] f2 / f1=-0.44

[0049] S r d nd Vd

[0050] OBJ ∞ d1 1.

[0051] 1 50.2498 2.0000 1.74950 35.28

[0052] 2 22.7855 4.5000 1.61800 63.33

[0053] 3 -104.3975 d2 1.

[0054] 4 -32.5788 1.5000 1.64000 60.07

[0055] 5 13.7640 3.0000 1.80100 34.97

[0056] 6 31.3627 d3 1.

[0057] 7 75.3717 2.0000 1.72047 34.71

[0058] 8 24.5155 4.0000 1.61800 63.33

[0059] 9 -48.2826 205.1679 1.

[0060] IMG ∞

[0061] 1st state 2nd state 3rd state

[0062] Focal length 100.5266 115.1106 54.1991

[0063] d1 183.3818 141.5308 120.6567

[0064] d2 4.0000 57.6034 93.8856

[0065] d3 31.1605 19.4079 4.0000

Embodiment 3

[0067] f2 / f1=-0.3

[0068]S r d nd Vd

[0069] OBJ ∞ d1 1.

[0070] 1 77.8209 4.5000 1.61800 63.33

[0071] 2 -22.1391 2.0000 1.74950 35.28

[0072] 3 -51.5324 d2 1.

[0073] 4 -14.2418 3.0000 1.80100 34.97

[0074] 5 -7.5503 1.5000 1.65160 58.55

[0075] 6 36.7823 d3 1.

[0076] 7 41.8809 2.0000 1.74950 35.28

[0077] 8 15.5357 4.0000 1.61800 63.33

[0078] 9 -32.6137 217.6615 1.

[0079] IMG ∞

[0080] 1st state 2nd state 3rd state

[0081] Focal length 98.2250 110.3805 57.0725

[0082] d1 186.6853 143.8504 120.6567

[0083] d2 4.0000 51.8132 81.3920

[0084] d3 15.3634 10.3851 4.0000

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Abstract

To provide a zoom lens for a Greenough stereomicroscope which consists of fewer lens groups, is mechanically simple, is low in cost and has sufficient optical performance. The zoom lens used for the Greenough stereomicroscope having a pair of optical systems arranged to intersect their optical axes with each other comprises a first group having positive refracting power, a second group having negative refracting power, and a third group having positive refracting power, performs variable magnification by changing the spacings between the respective lens groups and satisfies the following conditions: 0.5 G02B 15 / 16 G02B 21 / 02 9 8 2 2003 / 5 / 15 1462894 2003 / 12 / 24 1325958 2007 / 7 / 11 2007 / 7 / 11 2007 / 7 / 11 Olympus Optical Co., Ltd. Japan Yamanouchi Kazuhiko li hui 11127 San You Patent Agency No.201 Entrance 1, Building 13, the East of Jinmenli, Haidian District, Beijing 100088 Japan 2002 / 5 / 27 151975 / 2002

Description

technical field [0001] This invention relates to zoom lenses, and more particularly to zoom lenses for use in Greenough-type stereomicroscopes. Background technique [0002] As a known conventional example of a zoom lens for a stereo microscope, for example, the zoom lens described in Japanese Patent Publication No. 48-31259. This conventional example is a focusing optical system with a four-group structure. [0003] In addition, another known conventional example is, for example, a zoom lens described in Japanese Patent Publication No. 6-48328. This conventional example is an afocal zoom lens with a three-group structure. Contents of the invention [0004] The zoom lens described in Japanese Patent Publication No. 48-31259 has a structure of 4 groups, and the number of groups is large. In addition, the structure is complicated. Therefore, since the cost is high, it is not preferable. [0005] The zoom lens described in Japanese Patent Publication No. 6-48328 has a th...

Claims

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Application Information

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IPC IPC(8): G02B15/16G02B21/02G02B21/22G02B15/163
Inventor 山之内一彦
Owner OLYMPUS CORP