JPH11248995A - Objective with correction ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optionally set the turning force of the correction ring by providing a ring member which can freely move along an optical axis by engaging an objective barrel and a compressing member which is provided between the correction ring and ring member and presses the correction ring. SOLUTION: Lenses 2 are held in the objective barrel 30 and arranged opposite a cover glass 3. The objective barrel 30 is provided with the correction ring 32 rotatably. The ring member 35 is threadably engaged with the objective barrel 30. The ring member 35 freely moves along the optical axis by being screwed in the objective barrel 30. A compression coil spring 36 is provided between the correction ring 32 and ring member 35. The compression coil spring 36 presses the correction ring 32 against a cover 31 with its expanding pressure. The ring member 35 is rotated and moved along the optical axis and then the mount length of the compression coil spring 36 varies, so that the turning force of the correction ring 32 varies.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to, for example, an objective lens for a microscope, and has an aberration correcting function for correcting an aberration caused by a thickness error of a cover glass. About.

[0002]

2. Description of the Related Art For example, in an objective lens for a biological microscope having a high NA (aperture ratio), an arbitrary lens among the lenses in the objective lens is used as a means for correcting the occurrence of spherical aberration caused by a change in thickness of a cover glass of a specimen. The function of moving the aberration correction lens group (hereinafter abbreviated as correction lens group) along the optical axis direction is provided.

There are roughly two techniques for moving such a correction lens group. One of the techniques is, for example, JP-A-52-4854 and JP-A-1-30.
As described in Japanese Patent No. 7717, a screw is provided in the correction lens group and a cam is provided in the correction ring, and the screw moves by the action of the cam due to the rotation of the correction ring, and the correction lens group is integrated with the screw. Moves in the direction of the optical axis,
Alternatively, a cam that moves in conjunction with the rotation of the correction ring is provided, and the correction lens group moves in the optical axis direction so as to follow the cam.

Another technique is disclosed in, for example,
As described in Japanese Patent Application Laid-Open No. -162015, there is a type in which a correction group is moved in the optical axis direction by rotating a helicoid screw provided on a correction ring.

FIG. 3 is a diagram showing the mechanism of an objective lens using a general cam. The objective cylinder 1 has a plurality of lenses 2
Is held by the frame for each lens part, and the cover glass 3
Are arranged opposite to each other. In addition, 3 of these lenses 2
The lenses 2a are fixed to the frame 2b to form a correction lens group.

A cover 4 is attached to the tip of the objective cylinder 1, and an index ring 5 and a correction ring 6 are rotatably provided on the objective cylinder 1 in this order from the tip. .

As shown in FIGS. 4A and 4B, a cam portion 7 is formed on the correction ring 6, and a screw 8 is engaged with the cam portion 7. The screw 8 is provided on the frame 2 b of the correction lens group 2 a and is pressed against the cam portion 7 by the extension force of the compression coil spring 9.

The scale 10 is provided on the outer peripheral surface of the correction ring 6.
Is filled in. With such a configuration, the correction ring 6
Is rotated, the screw 8 moves along the optical axis along the cam 7 formed on the correction ring 6, and the frame 2b of the correction lens group 2a moves in the optical axis direction integrally with the movement of the screw 8. Move along.

In the objective lens, a stopper groove 12 for preventing rotation is formed by a stopper screw 11 on the surface of the correction ring 6 opposite to the cam surface as shown in FIG. In addition, 12a is a stopper position, and 7a is a cam end face.

The reason why the stopper groove 12 is formed in this way is that if the screw 8 provided on the frame 2b directly hits the cam end face 7a and acts as a stopper, the screw 8 may be deformed or damaged. It is.

FIG. 6 is a diagram showing the mechanism of an objective lens using a general helicoid screw. The same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
A cover 21 is attached to the tip of the objective cylinder 20. Further, a correction ring 22 is provided on the objective cylinder 20. A helicoid screw 2 is provided on the inner surface of the correction ring 22.
3 are formed. The correction ring 22 is provided with a stopper screw 24.

The correction ring 22 is moved in the direction of the optical axis by rotating along the helicoid screw 23 of the objective cylinder 20, and the screw 25 provided on the frame 2b of the correction lens group 2a is moved by this movement. It is to be moved in the axial direction.

The objective cylinder 20 is provided with a cover 26,
An index wheel 27 is provided on the cover 26. With such a configuration, when the correction ring 22 is rotated along the helicoid screw 23, the correction ring 22 moves in the optical axis direction,
Accordingly, the screw 25 provided on the frame 2b moves in the optical axis direction. The movement of the screw 25 causes the correction lens group 2a to move integrally with the frame 2b along the optical axis direction.

If the correction ring 22 is rotated too much in the cover 21, the screw 25 provided on the frame 2b acts as a stopper, and may be deformed or damaged.
As shown in FIG. 7, a stopper groove 28 is formed in the cover 21, and a stopper mechanism is provided by a stopper screw 24 provided in the correction ring 22.

[0015]

When the rotational force of the correction rings 6 and 22 is too small, a revolver can be applied to another objective lens at the time of microscopic examination, for example, when the rotational force of the correction rings 6 and 22 is too small. When the conversion is performed by rotation, the correction rings 6 and 22 are rotated due to vibration, impact, and the like. When the objective lens with the correction ring is used again, the focus must be adjusted again.

On the contrary, if the rotational force of the correction rings 6 and 22 is too heavy, it becomes difficult to turn the correction rings 6 and 22 while inspecting the microscope, and it is difficult to focus. For this reason, an objective lens with a correction ring is designed and assembled by trial and error in the amount of rotational force of the correction rings 6 and 22, but it is difficult to produce an optimal objective lens in use.

The objective lens provided with a stopper mechanism includes a stopper screw 11 and a stopper screw 11, as shown in FIGS.
24 must be located at the center positions of the stopper grooves 12 and 28, respectively. This is the correction ring 6, shown in FIGS.
This is because the distribution of each scale 10 attached to 22 is shifted.

For this purpose, adjustment (hereinafter referred to as centering of distribution) must be performed in the assembly so that the stopper screws 11 and 24 are located at the center positions of the stopper grooves 12 and 28, respectively.

In the objective lenses shown in FIGS. 3 and 6 as such adjustment, the lens groups before and after the correction lens group 2a are moved along the optical axis direction with a washer interposed between the end faces of the lens barrel 29. For example, there is a method of moving the frame 2b of the correction lens group 2a along the optical axis direction without rotating the correction ring 6 of the objective lens shown in FIG.

However, in such an adjustment method,
The re-assembly of the objective lens must be repeated several times,
Poor assemblability. Accordingly, an object of the present invention is to provide an objective lens with a correction ring that can arbitrarily set the amount of rotational force of the correction ring. Another object of the present invention is to provide an objective lens with a correction ring, which can easily center the distribution and improve the assemblability.

[0021]

According to the first aspect of the present invention, an objective lens with a correction ring for moving an aberration correction lens group in the objective lens along the optical axis direction in response to the rotation of the correction ring. A ring member screwed to the held objective cylinder, and movable in the optical axis direction in accordance with the rotation of the screwing; a compression member provided between the correction ring and the ring member to press the correction ring; Is an objective lens provided with a correction ring. According to the second aspect, in the objective lens with the correction ring according to the first aspect, a holding member that is screwed to the objective barrel and holds the correction ring at an arbitrary position is provided.

[0022]

(1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The same parts as those in FIG. 3 are denoted by the same reference numerals. FIG. 1 is a configuration diagram of an objective lens with a correction ring.

A plurality of lenses 2 are held in the objective cylinder 30 in the same manner as described above, and these lenses 2 are arranged to face the cover glass 3. And 2a of these lenses 2 constitutes a correction lens group.

A cover 31 is provided at the tip of the objective cylinder 30.
Is attached. The objective body 30 has a correction ring 3
2 is provided rotatably. And this correction ring 3
2 is partially held by the cover 31.

A cam portion 33 is formed on the correction ring 32, and a screw 34 provided on the cam portion 33 is engaged. The screw 34 is provided on the frame 2 b of the correction lens group 2 a and is pressed against the cam 33 by the extension of the compression coil spring 9.

Therefore, the correction ring 32 moves the screw 34 along the optical axis direction by the action of the cam 33 due to its rotation. A ring member 35 is screwed into the objective cylinder 30 by screwing. The ring member 35 is movable in the optical axis direction by screwing into the objective cylinder 30.

A compression coil spring 36 as a compression member is provided between the correction ring 32 and the ring member 35. The compression coil spring 36 has a function of pressing the correction ring 32 against the cover 31 by the extension pressure.

Thus, by moving the ring member 35 in the optical axis direction by screwing in, the equipment length of the compression coil spring 36 is changed. Next, the operation of the objective lens with a correction ring configured as described above will be described.

For example, when the correction ring 32 is rotated in order to move the correction lens group 2a for correcting aberration generated due to a change in the thickness of the cover glass 3 back and forth along the optical axis, the correction ring 32 It moves in the optical axis direction with rotation.

When the correction ring 32 moves in the optical axis direction, the screw 8 pressed against the correction ring 32 moves in the optical axis direction by the action of the cam portion 33 of the correction ring 32.

Accordingly, the movement of the screw 8 causes the correction lens group 2a to move integrally with the screw 8 along the optical axis direction. By the way, if the amount of rotational force of the correction ring 32 is too light, the correction ring 32 may be rotated due to vibration or impact when applied to a biological microscope and converted by rotating the revolver to another objective lens at the time of microscopy. When the objective lens with the correction ring is used again, focusing must be performed again. Conversely, if the weight is too heavy, it becomes difficult to turn the correction ring 32 while inspecting the microscope, and it becomes difficult to focus. In order to solve the problem, it is necessary to adjust the amount of rotational force of the correction ring 32.

That is, when the amount of rotation of the correction ring 32 is adjusted, the length of the compression coil spring 36 is reduced by rotating the ring member 35 and moving it along the optical axis along the screwing of the objective cylinder 30. And the amount of torque of the correction ring 32 changes.

As described above, in the first embodiment, the ring member 35 is provided movably in the optical axis direction by screwing into the objective cylinder 30, and is provided between the ring member 35 and the correction ring 32. Since the compression coil spring 36 for pressing the correction ring 32 against the screw 34 is provided, the compression coil spring 36 is moved by moving the ring member 35 in the optical axis direction.
By changing the equipment length, the amount of rotational force of the correction ring 32 can be arbitrarily adjusted.

Thus, by changing the equipment length of the compression coil spring 36 by rotating the ring member 35, the correction ring 3
2 can be easily adjusted and the correction ring 32 can be adjusted.
Can be adjusted to the optimal rotation amount. (2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The same parts as those in FIG. 1 are denoted by the same reference numerals.

FIG. 2 is a structural view of an objective lens with a correction ring. The holding member 40 is screwed to the objective cylinder 30. The holding member 40 has an L-shaped cross section, and holds the correction ring 32 at an arbitrary position on the end side.

With such a configuration, even if the stopper screw 11 is deviated from the center of the stopper groove provided on the opposite side of the cam portion 33 of the correction ring 32, the holding member 40
Screw in any direction to make the stopper screw 1
1 can be easily brought to the center of the stopper groove, and centering of the distribution can be easily performed.

As described above, in the second embodiment, the holding member 40 is screwed into the objective cylinder, and
0, the correction ring 32 is held at an arbitrary position. In addition to the effects of the first embodiment, the correction ring 3
The holding position of No. 2 can be arbitrarily changed, and the stopper screw 11 can be easily brought to the center of the stopper groove.

The present invention is not limited to the first and second embodiments, but may be modified as follows. For example, the compression coil spring 36 provided between the correction ring 32 and the ring member 35 can be replaced as long as it has a compressive action. Further, the present invention is not limited to application to a biological microscope objective lens having a high NA, and can be applied to various types of objective lenses.

[0039]

As described above in detail, according to the first aspect of the present invention, it is possible to provide an objective lens with a correction ring that can arbitrarily set the amount of rotational force of the correction ring. Further, according to the second aspect of the present invention, it is possible to provide an objective lens with a correction ring which can easily center the distribution and improve the assemblability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an objective lens with a correction ring according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of an objective lens with a correction ring according to the present invention.

FIG. 3 is a mechanism diagram of an objective lens using a conventional cam.

FIG. 4 is a configuration diagram showing a cam mechanism of a correction ring in the objective lens.

FIG. 5 is a configuration diagram showing a stopper mechanism of a correction ring in the objective lens.

FIG. 6 is a mechanism diagram of an objective lens using a conventional helicon screw.

FIG. 7 is a configuration diagram showing a stopper mechanism of a correction ring in the objective lens.

[Explanation of symbols]

 2: lens, 2a: correction lens group, 2b: frame, 30: objective cylinder, 32: correction ring, 33: cam, 34: screw, 35: ring member, 36: compression coil spring, 40: holding member.

Claims (2)

[Claims] 1. An objective lens with a correction ring for moving an aberration correction lens group in an objective lens along an optical axis direction in response to rotation of a correction ring, wherein the objective lens is screwed with an object cylinder holding the objective lens, and A ring member movable in the optical axis direction in accordance with the rotation of the screw engagement; and a compression member provided between the correction ring and the ring member to press the correction ring. Objective lens with a correction ring. 2. The objective lens with a correction ring according to claim 1, further comprising a holding member screwed to the objective cylinder and holding the correction ring at an arbitrary position.