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Zoom observation optical system

An optical system and low magnification technology, applied in the field of variable magnification observation optical systems, which can solve the problems of difficulty in realizing the overall lightweight of the unit, increasing the weight of the moving group, and complex mechanical structure.

Active Publication Date: 2017-09-26
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In Embodiment 1 of Patent Document 1, the moving group is composed of a plurality of lenses, so the weight of the moving group increases and the mechanical structure becomes complicated
Therefore, it is difficult to reduce the weight of the whole unit
In Example 2 of Patent Document 1, the group closest to the pupil in the eyepiece system is composed of only a pair of cemented lenses, so it is difficult to simultaneously and satisfactorily correct aberrations in the central portion and the peripheral portion

Method used

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  • Zoom observation optical system
  • Zoom observation optical system
  • Zoom observation optical system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] Unit: mm

[0145] surface data

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[0147] Aspheric data

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[0149] various data

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Embodiment 2

[0152] Unit: mm

[0153] surface data

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[0155] Aspheric Data

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[0157] various data

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Embodiment 3

[0160] Unit: mm

[0161] surface data

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[0163] Aspheric Data

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[0165] various data

[0166]

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PUM

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Abstract

The invention relates to a variable magnification observation optical system, which is provided with an objective lens system, an inverted upright system and an eyepiece system. The objective lens system consists of the positive first group, the positive second group and the negative third group sequentially from the object side, and the eyepiece system consists of the positive fourth group and the positive fifth group sequentially from the object side. The upright system is located between the first group and the second group. The fifth group is composed of a negative meniscus lens with a concave surface facing the object side and a positive lens disposed with an air space between the negative meniscus lens and the fifth group has at least one aspherical surface.

Description

technical field [0001] The present invention relates to a variable magnification observation optical system, for example, relates to a variable magnification observation optical system used in medical magnifiers, work magnifiers, binoculars, ground telescopes and the like. Background technique [0002] In observation optical systems used in magnifying glasses, binoculars, ground telescopes, etc., conventionally, a reverse erecting system such as a prism is used to invert the inverted image formed by the objective lens system into an erected image, and observe the image through the eyepiece system. The so-called Keplerian type (real image type) of the type. In addition, a zoom optical system having a zoom ratio of about 2x is easy to downsize, so as proposed in Patent Document 1, a zoom type that performs zooming with a pair of lenses sandwiching the above-mentioned inverted image is generally employed. [0003] For example, in Example 1 of Patent Document 1, for the purpose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B25/00G02B23/02
CPCG02B25/001G02B13/18G02B15/143103G02B15/145127G02B23/2423G02B27/0025
Inventor 神诚
Owner KONICA MINOLTA INC