JPH0550412U - Phase contrast condenser of microscope - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a phase difference condenser for a microscope which is inexpensive and has good operability. [Structure] An optical element in which a plurality of ring diaphragms are integrally formed concentrically, and an aperture corresponding to each ring diaphragm,
A phase difference condenser of a microscope having a light shielding plate in which each opening can be set at a position corresponding to each ring diaphragm was constructed. [Effect] The centering of a plurality of ring diaphragms does not require optical adjustment in the manufacturing process and is performed by a single operation at the time of observation, and one ring diaphragm corresponds to the phase ring for each observation. Since they are selectively used, they are inexpensive and have good operability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a phase difference capacitor for a microscope.

[0002]

[Prior Art]

 In a phase contrast microscope, a phase ring is arranged on the back focal plane of the objective lens and a ring diaphragm is arranged on the front focal plane of the condenser lens, and the condenser lens and the ring diaphragm are incorporated in the phase difference condenser. When the objective lens is switched by rotating the revolver, the phase ring is switched accordingly, so it is necessary to switch the ring diaphragm on the phase difference condenser side as well. For this reason, the phase difference condenser is provided with a turret or slider for holding a plurality of ring diaphragms, and the ring diaphragms are switched by rotating or inserting / removing this.

An image of the ring diaphragm of the phase difference condenser is formed on the phase ring surface of the objective lens. At this time, the image of the ring diaphragm needs to be shielded by the phase ring. If the ring diaphragm is eccentric, the image decenters and sticks out of the phase ring. Then, the shielding is not complete, light leaks and progresses, and the contrast of the observed image deteriorates. If the width of the phase ring is increased so that the image of the ring diaphragm does not protrude from the phase ring even if decentered, the shielding rate of the rear focal plane of the objective lens increases, that is, the aperture becomes smaller and the resolution decreases. ..

For this reason, even if the ring diaphragm held by the turret or the slider is switched by rotation or insertion / removal, there must be no eccentricity. For this reason, an optical adjustment process is provided at the manufacturing stage so that the image of the ring diaphragm is always shielded by the phase ring no matter which ring diaphragm is inserted in the optical path. However, since the eccentricity of the image of the ring diaphragm due to the inclination when mounting the phase difference condenser is unavoidable, the microscope observer must perform the centering operation with respect to the optical axis of the turret or the slider during use. ing.

Alternatively, a centering mechanism may be provided for each of the plurality of ring diaphragms, and a microscope observer may perform a centering operation each time the objective lens is switched.

[0006]

[Problems to be solved by the device]

 The centering adjustment of the ring diaphragm held by the turret or slider at the manufacturing stage is such that the image of the ring diaphragm is always shielded by the phase ring no matter which ring diaphragm is inserted in the optical path. Has the advantage of excellent operability, since it is not necessary to perform centering operation each time the objective lens is switched. However, this has a disadvantage that the manufacturing cost of the optical adjustment work is high.

Further, it is said that a centering mechanism is provided in each ring diaphragm, and a microscope observer performs a centering operation every time the objective lens is switched, although the manufacturing cost can be kept low, but the operability is poor. It has drawbacks.

In view of the above problems, an object of the present invention is to provide a microscope phase difference capacitor that is inexpensive and has good operability.

[0009]

[Means for Solving the Problems]

 The present invention has an optical element in which a plurality of ring diaphragms are integrally formed concentrically, and a plurality of apertures of different diameters corresponding to the respective ring diaphragms, and each aperture corresponds to a corresponding ring diaphragm. The phase difference capacitor of the microscope has a light shield plate that can be installed at any position, and changes the diameter of the ring diaphragm by selectively opposing a plurality of apertures to the optical element.

[0010]

[Action]

 The centering of the plurality of ring diaphragms is performed by one operation during observation without requiring optical adjustment in the manufacturing process, and one ring diaphragm is selectively used corresponding to the corresponding phase ring.

[0011]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 1 is a sectional view taken along the optical axis showing the schematic arrangement of the phase difference capacitor and the objective lens of this embodiment, FIG. 2 is a sectional view taken along the optical axis of the phase difference capacitor of this embodiment, and FIG. 3 is A- in FIG. Sectional drawing showing A section, FIG. 4 is a sectional view showing BB section in FIG. 2, FIG. 5 is a sectional view showing CC section in FIG. 2, and FIG. 6 is a position of two light shielding plates in FIG. It is a figure which shows the cross section corresponding to the CC cross section in the state which changed.

As shown in FIG. 1, a condenser lens main body 1 is arranged below and an objective lens 8 is arranged above a sample 9 placed on an optical axis 1 a of a stage (not shown). The objective lens 8 can be switched by rotating a revolver (not shown). The condenser lens body 1 holds individual condenser lenses 1b and 1c. The illumination light is condensed by the condenser lenses 1b and 1c and illuminates the sample 9, and the image of the sample 9 formed by the objective lens 8 is observed through an eyepiece lens (not shown).

A ring diaphragm glass 2 is provided near the front focal planes of the condenser lenses 1b and 1c. The ring diaphragm glass 2 is concentrically formed with a large diameter ring diaphragm 2a and a small diameter ring diaphragm 2b that transmit the illumination light. The inside of the ring diaphragm 2b is a light-shielding portion 2c and a ring diaphragm. A light shielding portion 2d is provided between the ring diaphragm 2a and the ring diaphragm 2b, and a light shielding portion 2e is provided outside the ring diaphragm 2a.

The light-shielding plate 4 is formed with a ring-shaped opening 4a corresponding to the ring diaphragm 2a, and similarly, the light-shielding plate 5 is formed with a ring-shaped opening 5a corresponding to the ring diaphragm 2b. .. FIG. 1 shows a state in which a ring-shaped opening 4a is inserted in the optical path and corresponds to the ring diaphragm 2a. . When the objective lens is switched, the ring-shaped opening 4a is removed from the optical path and the ring-shaped opening 5a is inserted into the optical path, as shown by the phantom line (two-dot chain line) in FIG. It corresponds.

A phase ring 8 a is formed in a ring shape near the rear focal plane of the objective lens 8. The width of the ring of the phase ring 8a is made larger than the width of the image of the ring diaphragm 2a formed on the phase ring 8a by the condenser lenses 1b, 1c and the objective lens 8. The objective lens 8 can be switched to another objective lens in which a phase ring corresponding to the ring diaphragm 2b is formed by rotating a revolver (not shown).

Next, the phase difference capacitor of this embodiment will be described in detail with reference to FIGS. The ring diaphragm holding metal member 3 to which the ring diaphragm glass 2 is fixed is held inside the condenser lens main body 1 so as to be slidable in a plane perpendicular to the optical axis 1a. The ring holding hardware 3 is centered and positioned within the plane by operating centering screws 7a and 7b.

The light shielding plate 4 is held by the rectangular window 1d of the condenser lens body so as to be slidable in a plane perpendicular to the optical axis 1a. A ring-shaped opening 4a and a circular opening 4e are formed in the light-shielding plate 4, and the projections 4f and 4g are brought into contact with the ends 1g and 1h of the connecting portion 1e so that they are concentric with the optical axis 1a. It is located in. Similarly, the light shield plate 5 is held by the condenser lens main body square window 1d so as to be slidable in a plane perpendicular to the optical axis 1a. A ring-shaped opening 5a and a circular opening 5e are formed in the light-shielding plate 5, and the projections 5f, 5g and the ends 1i, 1j provided on the connecting portion 1f are brought into contact with each other to form the optical axis 1a. It is positioned so as to be concentric.

The ring-shaped opening 4a is formed by connecting the inner light-shielding portion 4b and the outer light-shielding portion 4c with three connecting portions 4d. Similarly, the ring-shaped opening 5a is formed by connecting the inner light-shielding portion 5b and the outer light-shielding portion 5c with three connecting portions 5d.

The ring-shaped openings 4a and 5a have a sufficient width so that the ring diaphragms 2a and 2b are not caught even if the ring diaphragm glass 2 moves by the centering operation of the centering screws 7a and 7b. I have

The outer diameter of the circular opening 4e is larger than the outer diameter of the ring-shaped opening 5a, and the outer diameter of the circular opening 5e is larger than the outer diameter of the ring-shaped opening 4a.

The light shielding plates 4 and 5 are provided with knobs 4h and 5h for inserting / removing operations, respectively. The round dovetail 1k is an engaging member for attaching the condenser lens body 1 to the microscope body.

Next, the operation of this embodiment will be described. First, the condenser lens body 1 is attached to the microscope body by the round dovetail 1k. At this time, it is not centered yet.

Next, by operating the centering screws 7a and 7b, the ring diaphragm holding metal member 3 to which the ring diaphragm glass 2 is fixed is slid in a plane perpendicular to the optical axis 1a to perform centering. The two ring diaphragms 2a and 2b are concentrically formed on the ring diaphragm glass 2, and both are centered by a single centering operation.

When the objective lens 8 is used, as shown in FIG. 1, the ring-shaped opening 4 a of the light-shielding plate 4 and the circular opening 5 e of the light-shielding plate 5 are inserted in the optical path, and the ring-shaped opening of the light-shielding plate 5 is formed. The opening 5a is kept out of the optical path. That is, the ring-shaped opening 4a of the light shielding plate 4 is made to correspond so that the illumination light passes through the ring diaphragm 2a corresponding to the phase ring 8a of the objective lens 8. Therefore, the light shielding plate 4 is moved by the knob 4h so that the protrusion 4g contacts the end 1g of the connecting portion 1e so that the ring-shaped opening 4a is coaxial with the optical axis 1a. At this time, the light shielding plate 5 is moved by the knob 5h so that the projection 5f contacts the end 1j of the connecting portion 1f, and the circular opening 5e is arranged as shown in FIG. 5 so as to be coaxial with the optical axis 1a. To be done. The illumination light passes through the ring-shaped opening 4a, the circular opening 5e, and then the ring diaphragm 2a, is imaged on the phase ring 8a by the condenser lenses 1b, 1c and the objective lens 8 and is completely shielded.

When a revolver (not shown) is rotated and another objective lens is used, a ring-shaped opening 5a and a circular opening 4e are inserted into the optical path as shown by the outline in FIG. The opening 4a of is set in a state of being removed from the optical path. That is, the ring-shaped opening 5a is made to correspond so that the illumination light passes through the ring diaphragm 2b corresponding to the phase ring of the objective lens. Therefore, the light-shielding plate 5 is moved by the knob 5h so that the projection 5g contacts the end 1i of the connecting portion 1f, so that the ring-shaped opening 5a is coaxial with the optical axis 1a. At this time, the light shielding plate 4 is moved so that the projection 4f contacts the end 1h of the connecting portion 1f, and the knob 4h is moved so that the circular opening 4e is coaxial with the optical axis 1a, as shown in FIG. To be done. The illumination light passes through the circular opening 4e, the ring-shaped opening 5a, and then the ring diaphragm 2b, forms an image on another phase ring by the condenser lenses 1b, 1c and the objective lens 8 and is completely shielded.

It should be noted that although two ring diaphragms are provided in the present embodiment, provision of three or more ring diaphragms does not prevent this.

If the ring diaphragm glass can be detached from the optical axis, bright field observation as well as phase difference observation becomes possible. In this case, an aperture stop may be inserted or it may be incorporated in the capacitor lens body.

The plurality of ring-shaped openings are separately provided in the respective shading plates, but they may be provided in one shading plate and can be switched by inserting or removing or by turret-like rotation operation. Needless to say.

If the ring-shaped opening is formed on a transparent material such as glass, a connecting part for connecting the plurality of ring-shaped openings is not required, which facilitates further manufacturing.

[0030]

[Effect of the device]

 As described above, in the phase difference condenser of the present invention, centering of a plurality of ring diaphragms is performed by one operation during observation without optical adjustment in the manufacturing process. Since one corresponding to the phase ring is selected and used by using the light shielding plate, it is inexpensive and has good operability.

[Brief description of drawings]

FIG. 1 is a sectional view taken along an optical axis showing a schematic arrangement of a phase difference condenser and an objective lens of a present embodiment.

FIG. 2 is a sectional view taken along the optical axis of the phase difference capacitor of this embodiment.

3 is a sectional view showing an AA section in FIG.

4 is a cross-sectional view showing a BB cross section in FIG.

5 is a cross-sectional view showing a cross section taken along the line CC of FIG.

6 is a view showing a cross section corresponding to the cross section C-C in the state where the positions of the light shielding plates in FIG. 2 are exchanged with each other.

[Explanation of symbols]

 1 Condenser lens body 1a Optical axis 1b, 1c Condenser lens 1d Condenser lens body Square window 1e, 1f Connecting part 1g, 1h, 1i, 1j End part 1k Round dove 2 Ring diaphragm glass 2a, 2b Ring diaphragm 2c, 2d, 2e Shading Part 3 Ring diaphragm holding hardware 4, 5 Light-shielding plate 4a, 5a Ring-shaped opening 4e, 5e Circular opening 4f, 4g, 5f, 5g Protrusions 4b, 5b Inner light-shielding part 4c, 5c Outer light-shielding part 4d, 5d Connection Part 4h, 5h Knob 6 Coil spring 7a, 7b Centering screw 8 Objective lens 8a Phase ring 9 Sample

Claims (1)

[Scope of utility model registration request] 1. A phase difference condenser of a microscope having a condenser lens and a plurality of ring diaphragms arranged on a front focal plane of the condenser lens, wherein the plurality of ring diaphragms are concentrically formed. A light-shielding plate having a plurality of apertures that can be installed corresponding to each of the ring diaphragms, and the diameter of the ring diaphragms can be reduced by selectively opposing the plurality of openings to the optical element. A phase difference condenser for a microscope, which is modified.