JP2012103503A5

JP2012103503A5 -

Info

Publication number: JP2012103503A5
Application number: JP2010252267A
Authority: JP
Filing date: 2010-11-10
Publication date: 2013-11-07

Description

このような目的を達成するため、本発明に係る平行系実体顕微鏡用対物レンズは、物体からの光をその後に続く左右両眼用の２つの変倍光学系へと導くものであり、前記変倍光学系側から物体面側へ向かって順に並んだ、前記変倍光学系側に凹面を向けた負レンズを含み、全体で負の屈折力を有する第１レンズ群と、接合レンズを含み、全体で正の屈折力を有する第２レンズ群とからなり、前記第２レンズ群を構成するレンズ面の少なくとも１面が非球面であり、且つ、前記非球面が以下の条件式を満足する。
３．５＜｜ｈｏ／ｈｉ｜＜７．５
但し、
ｈｏ：前記非球面の最大画角における外側光束の主光線の高さ、
ｈｉ：前記非球面の最大画角における内側光束の主光線の高さ。 In order to achieve such an object, the objective lens for a parallel system stereomicroscope according to the present invention guides light from an object to the subsequent two variable magnification optical systems for the left and right eyes. A negative lens with a concave surface facing the variable magnification optical system side, arranged in order from the magnification optical system side to the object plane side, including a first lens group having a negative refractive power as a whole, and a cemented lens; The second lens group has a positive refractive power as a whole. At least one of the lens surfaces constituting the second lens group is an aspherical surface, and the aspherical surface satisfies the following conditional expression.
3.5 <| ho / hi | <7.5
However,
ho: the height of the principal ray of the outer luminous flux at the maximum angle of view of the aspheric surface,
hi: The height of the principal ray of the inner luminous flux at the maximum angle of view of the aspheric surface.

Claims

An objective lens for a parallel stereomicroscope that guides light from an object to two subsequent variable magnification optical systems for both left and right eyes,
Arranged in order from the zoom optical system side toward the object plane side,
A first lens group including a negative lens having a concave surface facing the variable magnification optical system and having a negative refractive power as a whole;
A second lens group including a cemented lens and having a positive refractive power as a whole;
An objective lens for a parallel system stereomicroscope, wherein at least one lens surface constituting the second lens group is an aspheric surface, and the aspheric surface satisfies the following conditional expression.
3.5 <| ho / hi | <7.5
However,
ho: the height of the principal ray of the outer luminous flux at the maximum angle of view of the aspheric surface,
hi: The height of the principal ray of the inner luminous flux at the maximum angle of view of the aspheric surface.

The objective lens for a parallel stereomicroscope according to claim 1, wherein the following conditional expression is satisfied.
0.70 <| ho / ERmax | <0.95
Where ERmax: effective maximum radius of the objective lens.

The objective lens for a parallel system stereomicroscope according to claim 1, wherein the following conditional expression is satisfied.
4.0 <(− f1) / f2 <9.0
2.4 <L / F <3.0
However,
f1: the focal length of the first lens group,
f2: focal length of the second lens group,
F: focal length of the entire objective lens system,
L: Total length of the objective lens.

The objective lens for a parallel system stereomicroscope according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
9.5 <θ <15.5
Where θ is the maximum half field angle at the minimum magnification of the zoom optical system.