JP2000089125A - Transmitted illumination condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitted illumination condenser capable of dealing with an objective lens having a high-power and also an objective lens having a very low power. SOLUTION: The very low power lens frame 6 with very low power condenser lenses 51 to 53 is supported on the horizontal guide 1a of a mount frame 1 which is attachably/detachably installed in the microscope main body 100, and also, a condenser tray 11 is supported by a vertical guide 61a installed on the very low power lens frame 4, and the condenser tray 11 is moved in a vertical direction cooperatively with the horizontal movement of the very low power lens frame 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission illumination condenser used for a microscope.

[0002]

2. Description of the Related Art In microscopes, objective lenses of different magnifications are generally used in a wide range from low magnification to high magnification. When such objective lenses having different magnifications are used while being rapidly converted from a low magnification to a high magnification, a sample field corresponding to the magnification of these objective lenses is made uniform using one kind of condenser lens. It is difficult to illuminate well. This is because a high-magnification objective requires a large numerical aperture, whereas a low-magnification objective requires a large field of view.

Therefore, when the magnification width of the objective lens used is large, it is necessary to switch the condenser lens by some means. Therefore, conventionally, as a method of switching the condenser lens, (1) a method in which the front end portion (tip portion) of the condenser lens is removed from the illumination optical path;
(2) A method of removing a front lens portion of a condenser lens from an illumination optical path and simultaneously adding a new lens to the optical path is used. These methods are described in, for example,
Japanese Patent Application Laid-Open No. 34126/1988 and Japanese Patent Application Laid-Open No. 63-183414.

However, those adopting these methods are:
It is impossible to handle a low-magnification objective lens of about 1.25 times or less, especially an extremely low-magnification objective lens of 1 time or less. there were.

Conventionally, there are three types of condenser lens groups, and by switching these lens groups,
Japanese Patent Application Laid-Open No. H9-90905 can handle from a very low magnification objective lens of about 0.5 × to a high magnification objective lens of about 100 ×.
No. 33820.

In other words, the lens disclosed in Japanese Patent Application Laid-Open No. 9-33820 discloses a condenser lens group having a high magnification corresponding to a magnification of 10 to 100 times and a condenser lens having a low magnification corresponding to a magnification of 2 to 4 times. A lens group and an ultra-low condenser lens group corresponding to a magnification of 0.5 to 1 times, wherein an optical axis of the condenser lens group and an optical axis of the illumination optical system are arranged on the same plane, and illumination is performed. The optical axis of the optical system and the optical axis of each condenser lens group intersect each other at one point, and a rotation axis orthogonal to the optical axis plane is provided at the intersection, and each condenser lens group is rotated by this rotation axis. By doing so, switching of the condenser lens group from high magnification to extremely low magnification is performed.

[0007]

However, in such a configuration, since the optical axes of the three types of condenser lens groups are arranged on the same plane, a fixed space space is provided in the optical path near the rotation axis. This is a constraint on optimizing the illumination performance of each condenser lens group, and there is a problem that an aperture stop cannot be formed inside or near the condenser lens group.

In this regard, the collector lens group and the intermediate lens group are arranged so as to form a light source image on a plane conjugate with the front focal position of the condenser lens group, and an aperture stop is provided on this light source image plane. It is considered.

However, even in this case, the position of the aperture stop is located at the base portion of the microscope main body. In order to apply such a condenser lens group to a general microscope, it is necessary to use the condenser main body. An aperture stop must be added to the base.

Further, the optical axes of the three types of condenser lens groups are formed on the same plane, and each condenser lens group is rotated by a rotation axis perpendicular to this plane. There is also a problem that an optical element for a phase contrast and a differential interference contrast cannot be added to the optical path. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a transmission illumination condenser capable of supporting an objective lens having a high magnification to an extremely low magnification.

[0011]

According to the first aspect of the present invention,
In a transmission illumination condenser for illuminating a sample field corresponding to an objective lens of a microscope, a mounting member detachably provided on a microscope body, a horizontal guide mechanism provided on the mounting member, and a horizontal guide mechanism provided by the horizontal guide mechanism. An ultra-low magnification lens frame having an ultra-low magnification condenser lens group movably supported, a vertical guide mechanism provided on the ultra-low magnification lens frame, and the ultra-low magnification lens frame by the vertical guide mechanism. It comprises a condenser receiving portion supported so as to be movable in the vertical direction, and an interlocking mechanism for moving the condenser receiving portion in the vertical direction in conjunction with the horizontal movement of the extremely low magnification lens frame.

According to a second aspect of the present invention, in a transmission illumination condenser for illuminating a sample field corresponding to an objective lens of a microscope, a mounting member detachably provided on a microscope main body and a vertical guide provided on the mounting member. A mechanism, a moving member supported movably in the vertical direction by the vertical guide mechanism, a horizontal guide mechanism provided on the moving member, and a horizontally movable mechanism with respect to the moving member by the horizontal guide mechanism. An ultra-low magnification lens frame having a supported ultra-low magnification condenser lens group, a condenser receiving unit provided integrally with the ultra-low magnification lens frame, and interlocking with the horizontal movement of the ultra-low magnification lens frame. And an interlocking mechanism for moving the moving member in the vertical direction.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, part or all of the ultra-low magnification condenser lens group is vertically moved relative to the ultra-low magnification lens frame in conjunction with the horizontal movement of the ultra-low magnification lens frame.

As a result, according to the first and second aspects of the present invention, even when a high-magnification condenser having a short focal length is attached to the condenser receiving portion, the condenser is linked to the horizontal movement of the ultra-low magnification lens frame. Since the receiving portion can be vertically moved, the condenser can be easily switched without interference with the stage and the stage receiving portion.

By mounting a high-low switching type general-purpose condenser to the condenser receiving portion, a transmission illumination condenser capable of coping with a wide range of magnifications of the objective lens from extremely low magnification to high magnification can be realized.

According to the third aspect of the present invention, the ultra-low magnification lens frame is moved horizontally, the ultra-low magnification condenser lens group is removed from the illumination optical path, and the high-magnification condenser lens (condenser receiving portion) is inserted into the illumination optical path. In such a case, the ultra-low magnification lens frame is retracted to the lower part of the stage receiving part of the microscope, but part or all of the ultra-low magnification condenser lens group is interlocked with the horizontal movement of the ultra-low magnification lens frame. Since the microscope is moved in the vertical direction, the space for retreating the extremely low magnification lens frame of the stage receiving portion of the microscope can be reduced, and the strength of the stage receiving portion can be easily secured.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 3 show a first embodiment. FIG. 1 is a longitudinal sectional view when an ultra-low magnification condenser lens group is inserted into an optical path, and FIG. FIG. 3 is a side view (partially sectional view) when a capacitor receiving portion (high-magnification condenser) is inserted into the optical path, and FIG. 3 is a top view (partially sectional view) of FIG.

In FIG. 1, reference numeral 100 denotes a microscope main body. The microscope main body 100 is provided with a stage receiver 101 fixed so as to be focusable by a focusing mechanism (not shown), and a stage 102 is mounted on the upper part of the stage receiver 101. Provided. An opening 102a for a lighting condenser is provided below the stage 102.

The stage receiver 101 includes a stage 1
A stopper shaft 101a for preventing the position of the reference numeral 02 from falling below the in-focus position by a predetermined range or more is attached. On the base of the microscope main body 100, a mounting dovetail 100a for mounting an illumination condenser is provided, and an intermediate optical system for guiding a light beam emitted from an unillustrated illumination light source to a condenser lens is provided. That is, a light beam emitted from an illumination light source (not shown) is transmitted from the intermediate optical system through a condenser lens group, which will be described later, which is mounted on the base of the microscope main body 100, and then the stage 10
Illuminate the sample 103 placed on the upper surface of the sample 2
The configuration is such that a sample image can be observed by an objective lens and an eyepiece (not shown) arranged above.

On the other hand, reference numeral 1 denotes a mounting frame, and the mounting frame 1 is provided so as to be centerable with respect to a mounting dovetail 100a of the microscope main body 100 by a plunger 2, a spring 3, and centering screws 4 and 5.

The mounting frame 1 is provided with a horizontal guide 1a, and an extremely low magnification lens frame 6 is mounted on the horizontal guide 1a so as to be horizontally movable. The ultra low magnification lens frame 6 is provided with a lens frame 7, and ultra low magnification condenser lenses 51, 52 and 53 are integrally fixed to the lens frame 7. A movable lens frame 8 is fitted on the extremely low magnification lens frame 6 so as to be vertically movable. The movable lens frame 8 is formed by integrally fixing ultra-low magnification condenser lenses 54 and 55 integrally.

A cam pin 9 is fixed to the movable lens frame 8. The cam pin 9 is slidably fitted in a vertically long groove 6 a provided in the extremely low magnification lens frame 6. 1
Reference numeral 0 denotes a cam plate fixed to the mounting frame 1. The cam plate 10 is provided with a cam groove 10a.
The cam pin 9 is inserted.

The very low magnification lens frame 6 is provided with a vertical guide 61a, and the vertical guide 61a supports the condenser receiver 11 so as to be vertically movable. The extremely low magnification lens frame 6
A pair of cross roller guide mechanisms (not shown) is provided between the vertical guide 61a and the capacitor receiver 11.

The capacitor receiver 11 is configured so that a capacitor can be attached and detached, and has a fixing screw 12 for fixing the capacitor. An eccentric pin 13 is rotatably attached to the capacitor receiver 11, and the eccentric pin 13 is pressurized by the elastic force of a disc spring 14, and has a focusing handle 15 fixed to the end. .

The mounting frame 1 is provided with a cam plate 16.
The cam plate 16 is provided with a cam groove 16a, and the eccentric pin 13 is inserted into the cam groove 16a. 17 is
A spring support 1 fixed integrally to the extremely low magnification lens frame 6 by a spring
8 and is guided by a shaft 19 fixed to the spring receiver 18, so that the capacitor receiver 11 is always urged upward.

A stopper screw 20 is fixed to the upper surface of the capacitor receiver 11. When a high-magnification condenser is attached to the condenser receiver 11 and inserted into the illumination optical path (FIG. 2), the stopper screw 20 is used when the stage 102 is lowered below the focus position on the sample. Is in contact with the lower surface of the stage receiver 101 before coming into contact with the sample 103.

At the position where the high-magnification condenser is inserted into the illumination optical path, a cam groove 16a formed in the cam plate 16 is formed.
Is wide so that it can move downward with respect to the eccentric pin 13.

Reference numerals 21 and 22 denote switching knobs fixed to the extremely low magnification lens frame 6. Reference numeral 23 denotes a click device configured on the mounting frame 1. The click grooves 6 b and 6 c provided on the ultra-low magnification lens frame 6 insert the ultra-low magnification lens frame 6 into the illumination optical path. The click stop is performed when it is performed and when a high-magnification condenser (capacitor receiver) is inserted into the illumination optical path.

Next, the operation of the first embodiment configured as described above will be described. In this case, the capacitor receiver 1
Since a condenser can be attached to and detached from 1, if a switching type condenser from high magnification to low magnification is attached, a wide range of magnification of the objective lens from extremely low magnification (0.5 times) to high magnification (100 times) By installing a turret condenser with a turret that can selectively insert various optical elements into the optical path, rapid switching of each magnification, phase difference observation at high magnification, differential interference A capacitor device capable of quickly switching a plurality of observation methods such as observation can be configured.

Here, a case of a capacitor device in which a turret capacitor 60 is attached to the capacitor receiver 11 will be described. First, when the turret condenser 60 is inserted into the illumination optical path by operating the switching knobs 21 and 22, the extremely low magnification lens frame 6 is attached to the horizontal guide 1 provided on the mounting frame 1.
When the turret condenser 60 enters the illumination optical axis, it is click-stopped by the click device 23 and the click groove 6c.

In this case, the condenser receiver 11 is movably supported by the vertical guide 61a provided on the extremely low magnification lens frame 6 and is always urged upward by the spring 17, so that the condenser receiver 11 The rotatably mounted eccentric pin 13 is provided with a cam groove 16 provided in the cam plate 16.
The turret condenser 60 is moved so as to be in contact with above the position a, and is set so as to be a regular illumination position even in the vertical direction at a position inserted in the illumination optical path. Further, since the eccentric pin 13 is pressurized by the disc spring 14 and is set so as not to rotate by the movement, the eccentric pin 13 is accurately moved along the cam groove 16a.

The precise adjustment of the focusing position of the high-magnification condenser is performed by adjusting the focusing handle 1 attached to the eccentric pin 13.
By rotating the eccentric pin 13, the eccentric pin 13 is rotated to adjust the height position of the high-magnification condenser. The accurate adjustment of the illumination center is performed by the plunger 2, the spring 3, and the centering provided on the mounting frame 1. This is performed by moving the mounting frame 1 in the horizontal direction with the screws 4 and 5.

When the turret condenser 60 is inserted in the illumination optical path, the operation of the aperture stop, switching between high-magnification illumination and low-magnification illumination, and insertion of various optical elements into the optical path, etc., require the operation of the turret condenser 60. These operations can be performed by, for example,
Since the details are disclosed in, for example, Japanese Patent No. 82617, description thereof is omitted here.

Also, when the stage 102 is lowered for focusing on the sample 103 or exchanging the sample while the turret condenser 60 is inserted in the illumination optical path, it is possible to prevent the upper surface of the condenser and the sample 103 from interfering with each other. Since the stopper screw 20 provided on the upper surface of the capacitor receiver 11 is configured to be in contact with the stage receiver 101 and the cam groove 16a into which the eccentric pin 13 is inserted is configured to be wide,
The capacitor receiver 11 is lowered by the stage receiver 101, so that the capacitor does not interfere with the sample 103.

Since the amount of the stage 102 descending from the in-focus position is regulated within a certain range by the stopper shaft 101a, no excessive force is applied to the condenser.
In conjunction with the horizontal movement of the ultra-low magnification lens frame 6 for inserting the turret condenser 60 into the illumination optical path, the moving lens frame 8 to which the ultra-low magnification condenser lenses 54 and 55 are fixed is also mounted on the cam plate 10. It is moved along the cam groove 10a provided. In this case, a cam pin 9 fixed to the movable lens frame 8 is provided with a long groove 6 a provided in the extremely low magnification lens frame 6.
The movable lens frame 8 is slidably fitted into the cam groove 10a, so that the movable lens frame 8 is vertically moved in conjunction with the movement of the extremely low magnification lens frame 6.

As a result, when the turret condenser 60 is inserted into the illumination optical path, the ultra-low magnification condenser group is retracted below the stage receiver 101, but the movable lens frame 8 is moved in the vertical direction. The space for evacuating the extremely low-magnification condenser of the receiver 101 is small, and the strength of the stage receiver 101 can be easily secured.

Next, when the switching knobs 21 and 22 are operated to insert the ultra-low magnification condenser lens groups 51 to 55 into the illumination light path, the eccentric pin 13 attached to the condenser receiver 11 is used.
Is biased by the spring 17 so as to be in contact with the cam groove 16a, so that the condenser receiver 11 and the turret condenser 60 are vertically moved along the cam groove 16a in conjunction with the horizontal movement of the extremely low magnification lens frame 6. . Since the cam groove 16a is set so that the stage 102 and the high-magnification condenser do not interfere with each other, the ultra-low magnification condenser lens group is inserted into the illumination optical path without interference, and click-stopped by the click device 23 and the click groove 6c. You. The ultra-low magnification condenser lenses 54 and 55 fixed to the movable lens frame 8 are moved by the cam pins 9 in the vertical direction along the cam grooves 10a, and set to the regular illumination positions.

Accordingly, with such a configuration, the condenser receiver 11 can be vertically moved in conjunction with the horizontal movement of the ultra-low magnification lens frame 6, so that interference with the stage or the stage receiver is eliminated and the condenser can be easily mounted. Switching can be performed, and the ultra-low magnification condenser lens group having a large diameter can be retracted to the lower portion of the stage receiver by horizontal movement, so that a compact configuration that does not hinder stage operation or the like can be obtained.

Further, since a well-known high-low magnification switching type condenser can be attached to the condenser receiver 11, an inexpensive magnification switching ultra-low magnification transmission illumination condenser capable of easily switching from extremely low magnification to high magnification is realized. it can.

Further, since a condenser having a well-known aperture stop can be attached to the condenser receiver 11, there is no need to add an aperture stop to the microscope body 100. Furthermore, if a turret condenser having a turret capable of inserting various optical elements into the optical path is attached to the condenser receiver 11, a plurality of observation methods such as rapid switching of each magnification and phase difference observation at a high magnification and differential interference observation can be realized. It is also possible to realize an ultra-low magnification transmission illumination condenser that can be switched quickly.

The cam pin 9 and the eccentric pin 13 of the first embodiment may be configured such that the cam groove sliding portions are radial bearings and the cam grooves 10a and 16a are rolled. With this configuration, the switching of the magnification can be performed more smoothly.

In the first embodiment, the horizontal guide mechanism and the vertical guide mechanism are cross roller guides, but they may be constituted by a slide guide mechanism such as an ant guide. With this configuration, a more compact configuration can be achieved.

Further, in the first embodiment, the centering at the time of high-magnification illumination is such that the mounting frame 1 is moved horizontally. 11 may be provided with a centering mechanism.

Furthermore, in the first embodiment, the capacitor receiver 11 is configured to move vertically, but a capacitor of a high-magnification / low-magnification switching system may be integrated with the capacitor receiver 11. (Second Embodiment) FIGS. 4 to 7 are views showing a second embodiment. FIG. 4 is a longitudinal sectional view when an extremely low magnification condenser lens group is inserted into an optical path, and FIG. FIG. 6 is a top view (partial cross-sectional view) of FIG. 4, and FIG. 7 is a front view (partial cross-sectional view) of FIG. 4 when a receiving portion (high-magnification condenser) is inserted into the optical path. Here, FIGS. 4 to 7
The same reference numerals are given to the same parts as those in FIGS. 1 to 3 of the first embodiment, and the description thereof will be omitted.

In this case, reference numeral 31 denotes a mounting frame.
Reference numeral 1 is provided so as to be centerable with respect to a mounting dovetail 100a of the microscope main body 100 by a plunger 2, a spring 3, and centering screws 4 and 5.

The mounting frame 31 has a pair of left and right vertical guides 3.
The moving frame 32 is supported by the vertical guide 31a so as to be vertically movable. The space between the vertical guide 31a of the mounting frame 31 and the moving frame 32 is configured as a pair of cross roller guide mechanisms.

The moving frame 32 has a pair of left and right horizontal guides 32.
The horizontal guide 32a supports the extremely low magnification lens frame 6 so as to be horizontally movable. The horizontal guide 3
A pair of left and right cross roller guide mechanisms (not shown) is provided between the lens frame 2a and the extremely low magnification lens frame 6.

The very low magnification lens frame 6 includes a condenser receiver 11.
Are provided integrally. A stopper screw 20 is provided on the upper surface of the extremely low magnification lens frame 6. When the high-magnification condenser is attached to the condenser receiver 11 and inserted into the illumination optical path (FIG. 5), the stopper screw 20
When the lens is lowered below the focus position on the sample 103, the upper surface of the high-magnification condenser contacts the lower surface of the stage receiver 101 before the upper surface of the high-magnification condenser comes into contact with the sample 103.

The spring shaft 19 integrally fixed to the mounting frame 31
Supports a pair of right and left springs 17.
The spring 17 is guided by a spring shaft 19 and constantly urges the moving frame 32 upward. Further, the bearing 33 fixed to the vertical guide 31a rotatably supports the eccentric pin 13. On the lower surface of the eccentric pin 13,
The cam surface 6d formed on the side surface of the extremely low magnification lens frame 6 urged upward by the spring 17 is always in contact.

The eccentric pin 13 is pressurized by the elastic force of the disc spring 14, and a focusing handle 15 is fixed to the tip. Reference numerals 21 and 22 denote switching knobs fixed to the capacitor receiver 11.

Next, the operation of the second embodiment configured as described above will be described. In this second embodiment,
The moving frame 32 constituting the horizontal guide is used to move the microscope body 100
It is supported so as to be able to move vertically by a vertical guide 31a provided integrally with the mounting frame 31. Therefore, when the extremely low magnification lens frame 6 is moved horizontally, the moving frame 32
In addition, the extremely low magnification lens frame 6 and the condenser receiver 11 integrally formed with the extremely low magnification lens 6 move vertically together.

The other operation is the same as that of the first embodiment, and the description is omitted. In the second embodiment, since the extremely low magnification lens frame 6 moves in the horizontal direction and at the same time in the vertical direction, the space for retracting the extremely low magnification lens frame 6 below the stage receiver 101 is limited to the first embodiment. Although it is required to be larger than that of the embodiment, there is no practical problem since the strength of the stage receiver can be secured on both sides of the evacuation space.

Therefore, the same effect as that of the first embodiment can be expected by such a configuration. In the second embodiment, a part (54, 55) of the very low magnification lens group is used.
Only the extremely low magnification lens frame 6 moves relatively vertically, but the whole ultra low magnification lens group may move relatively vertically. With this configuration, it is possible to reduce the retreat space of the extremely low magnification lens frame 6 of the stage receiver 101.

[0054]

As described above, according to the present invention, the condenser receiver is vertically moved in conjunction with the horizontal movement of the very low magnification condenser lens. Even when a capacitor is mounted, it can be easily switched without interference with the stage or stage receiver.If a general-purpose high-low switching type capacitor is mounted on the capacitor receiver, it can be used in a wide range from extremely low to high. It is possible to realize a transmission illumination condenser capable of coping with a large objective lens magnification.

When the ultra-low magnification lens frame is moved horizontally, the ultra-low magnification condenser lens group is removed from the illumination optical path, and the high-magnification condenser lens (condenser receiver) is inserted into the illumination optical path. Since part or all of the ultra-low magnification condenser lens group can be moved vertically in conjunction with the horizontal movement of the lens frame, the space for retreating the ultra-low magnification lens frame of the stage receiving portion of the microscope can be reduced and the stage receiving portion can be moved. It is easy to secure strength.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view when an ultra-low magnification condenser lens group according to a first embodiment of the present invention is inserted into an optical path.

FIG. 2 is a side view of the case where the capacitor receiving portion (high-magnification capacitor) according to the first embodiment is inserted into an optical path.

FIG. 3 is a top view (partially sectional view) of FIG. 1 in the first embodiment;

FIG. 4 is a vertical cross-sectional view when an ultra-low magnification condenser lens group according to a second embodiment of the present invention is inserted into an optical path.

FIG. 5 is a side view of a case where a capacitor receiving portion (high-magnification capacitor) according to the second embodiment is inserted into an optical path.

FIG. 6 is a top view (partially sectional view) of FIG. 4 according to the second embodiment;

FIG. 7 is a front view (partially sectional view) of FIG. 4 in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mounting frame 1a ... Horizontal guide 2 ... Plunger 3 ... Spring 4.5 ... Centering screw 6 ... Extra-low magnification lens frame 6a ... Long groove 6b. 6c: Click groove 6d: Cam surface 61a: Vertical guide 7: Lens frame 8: Moving lens frame 9: Cam pin 10: Cam plate 10a: Cam groove 11: Capacitor receiver 12: Fixing screw 13: Eccentric pin 14: Disc spring 15 ... Focusing handle 16 ... Cam plate 16a ... Cam groove 17 ... Spring 18 ... Spring support 19 ... Shaft 20 ... Stopper screw 21.22 ... Switching knob 23 ... Click device 31 ... Mounting frame 31a ... Vertical guide 32 ... Moving frame 32a ... Horizontal Guide 33: Bearings 51 to 55: Ultra-low magnification condenser lens group 60: Turret condenser 100: Microscope body 100a: Mounting ants 101: Stage receiver 101a: Stopper shaft 102: Stage 102a: Opening 103: Sample

Claims (3)

[Claims] 1. A transmission illumination condenser for illuminating a sample field corresponding to an objective lens of a microscope, comprising: a mounting member detachably provided on a microscope body; a horizontal guide mechanism provided on the mounting member; An ultra-low magnification lens frame having an ultra-low magnification condenser lens group supported movably in the horizontal direction by a mechanism; a vertical guide mechanism provided in the ultra-low magnification lens frame; and the ultra-low magnification by the vertical guide mechanism. A condenser receiver supported movably in the vertical direction with respect to the lens frame, and an interlocking mechanism for moving the condenser receiver in the vertical direction in conjunction with the horizontal movement of the extremely low magnification lens frame. A transmission illumination condenser characterized by the above-mentioned. 2. A transmission illumination condenser for illuminating a sample field corresponding to an objective lens of a microscope, comprising: a mounting member detachably provided on a microscope main body; a vertical guide mechanism provided on the mounting member; A moving member supported movably in a vertical direction by a mechanism, a horizontal guide mechanism provided on the moving member, and an extremely low magnification supported movably in a horizontal direction with respect to the moving member by the horizontal guide mechanism An ultra-low magnification lens frame having a condenser lens group; a condenser receiving portion provided integrally with the ultra-low magnification lens frame; and moving the moving member in the vertical direction in conjunction with the horizontal movement of the ultra-low magnification lens frame. A transmission illumination condenser comprising: an interlocking mechanism for moving the transmission illumination. 3. The ultra-low magnification condenser lens group is moved vertically or partially with respect to the ultra-low magnification lens frame in conjunction with horizontal movement of the ultra-low magnification lens frame. Item 3. A transmission illumination condenser according to item 1 or 2.