JP2000098237A - Depression angle varying lens barrel for microscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable installing various kinds of additional devices, besides, to enable setting an eye point position higher. SOLUTION: As for the lens barrel, a rotary frame 2 with a binocular barrel part 3 is rotatably arranged on a fixed frame 1 attached to a microscope main body, and a reflection mirror 5 is installed so that the reflection mirror 5 may be rotated in the same direction of the rotary frame 2 by only half the rotating angle of the frame 2 cooperatively with the rotation of the frame 2, and an image forming lens 6 for forming the image of a luminous flux from the reflection mirror 5 in the binocular barrel part 3, a trapezoidal prism 7 and a triangular prism 8 for guiding the luminous flux to the barrel part 3 are arranged, and the triangular prism 8 is provided with a reflection surface for reflecting the luminous flux from the image forming lens 6 twice, and also, one of the reflection surfaces is also used as an outgoing surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an observing lens barrel for a microscope, and more particularly to a variable oblique viewing angle lens barrel capable of changing an oblique viewing angle. ,

[0002]

2. Description of the Related Art Conventionally, in a microscope having an infinity-correcting objective lens and an imaging lens for forming an object image on an eyepiece image plane, for example, an incident-light fluorescent illumination is provided in an optical path between the objective lens and the imaging lens. It has been considered that an additional device such as a device or a discussion device can be inserted to provide versatility.

However, when such various devices are added, the height of the eye point (the exit pupil position of the eyepiece) for microscopic observation changes, and the height of the eye point from the ergonomic point and the height of the observation point change. It is necessary to be able to change the angle of the bird's-eye view.

In view of the above, there has been conventionally proposed a microscope in which the binocular tube on which the eyepiece is mounted can be varied in the angle of view. For example, as disclosed in Japanese Utility Model Laid-Open No. 4-124218, a microscope is disclosed. Is reflected four times in a right angle direction and guided to a binocular tube portion, JP-A-8-286115 and JP-A-10-14.
As disclosed in JP-A-8-278448, an optical axis of a light beam from an objective lens is reflected twice in the same plane and guided to a binocular tube as disclosed in JP-A-2473. There is another type in which an optical axis is reflected four times in the same plane and guided to a binocular tube.

[0005]

SUMMARY OF THE INVENTION
In the device disclosed in Japanese Patent No. 124218, the optical path length from the imaging lens to the binocular tube becomes long, so that when a large-diameter light beam is passed, the optical path configuration becomes difficult. That is, as described above, when an additional device such as an epi-illumination fluorescent illumination device is inserted into the optical path between the objective lens and the imaging lens, the optical path length between them increases. For this reason, the effective diameter of the imaging lens is increased and the diameter of the light flux from the imaging lens to the eyepiece is increased in order to effectively form the imaging light from the objective lens on the image plane of the eyepiece. If the diameter of the light beam from the imaging lens to the eyepiece is increased, there is a problem that it is difficult to configure an optical path splitting element for binocular vision, an optical element for deflecting the optical path, and the like within the focal length of the imaging lens. Furthermore, since the binocular tube is supported rotatably on two axes, it is difficult to adjust the alignment of the optical path,
There is also a problem that the price becomes expensive.

Japanese Patent Application Laid-Open No. 8-278448 and Japanese Patent Application Laid-Open No. 10-142473 disclose an image forming beam from an objective lens formed on only one group of image forming lenses on an image plane of an eyepiece. Instead, since the image is formed using a relay lens, there is a problem that the number of lenses increases correspondingly and the cost becomes high.

[0007] Further, Japanese Patent Application Laid-Open No. 8-286115 discloses an image forming apparatus using a two-lens imaging lens to form an image on an image plane of an eyepiece. If is not long, it is difficult to configure an optical path splitting element for binocular vision, an optical element for deflecting the optical path, a rotatable optical path polarizing element, and the like in the optical path from the imaging lens to the eyepiece. Incidentally, in a practical microscope, the focal length of the imaging lens is 160 mm to 200 m.
m and within this focal length.
It was difficult to configure the conventional example disclosed in Japanese Patent Publication No. 115-115.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a variable viewing angle lens barrel for a microscope in which various additional devices can be installed and the eye point position can be set high. And

[0009]

According to the first aspect of the present invention,
In a variable viewing angle lens barrel for a microscope in which a rotating frame having a binocular barrel is rotatably provided with respect to a fixed frame attached to a microscope main body, the rotation angle is interlocked with the rotation of the rotating frame, and the rotation angle is １ ／. And a first reflecting member for deflecting a light beam from the microscope main body, the light beam from the first reflecting member being provided on the rotating frame. A second reflecting member and a third reflecting member configured to be guided to the cylindrical portion; and the first and second reflecting members.
An imaging lens that is provided in an optical path between the second reflection member and the second reflection member, the light beam from the microscope main body deflected by the first reflection member being formed into an image in the binocular tube portion. Of the reflecting surface of the member and the third reflecting member,
It is characterized in that at least one surface also serves as an entrance surface or an exit surface.

According to a second aspect of the present invention, in the first aspect, the second reflecting member and the third reflecting member are each constituted by one triangular prism having a reflecting surface for reflecting a light beam three times. One of these three reflecting surfaces is also used as an emission surface.

[0011] The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described in the above, the binocular tube portion provided on the rotating frame is capable of being attached in a 180 ° reverse direction.

As a result, according to the first aspect of the present invention,
By making at least one of the two reflecting surfaces of the second reflecting member and the third reflecting member also serve as an incident surface or an outgoing surface, the spectral path length can be shortened,
Even if the diameter of the light beam between the imaging lens and the binocular tube is increased, the optical path can be configured. Since the diameter of the light beam can be increased, the effective diameter of the imaging lens can be increased, and a space for installing various additional devices between the microscope main body and the imaging lens can be secured.

According to the second aspect of the present invention, since the second reflecting member and the third reflecting member can be constituted by a single triangular prism reflecting three times, the optical path length required for the optical path configuration is further increased. It can be shortened and the production cost can be reduced. According to the third aspect of the present invention, the appointment height can be set high by making the mounting direction of the binocular tube portion 180 ° reverse.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a schematic configuration of a variable viewing angle barrel for a microscope to which the present invention is applied. In the drawings, reference numeral 1 denotes a fixed frame of a lens barrel, and the fixed frame 1 has a mounting portion 1a for mounting on a microscope main body (not shown).

The fixed frame 1 supports a rotating frame 2 rotatably. The rotating frame 2 is provided with a binocular tube 3 at a tip end thereof, so that a turning angle of the rotating frame 2 with respect to the fixed frame 1 can change a viewing angle of the binocular tube 3.

In the fixed frame 1, a prism 4 is arranged near the mounting portion 1a. The prism 4 is arranged in an optical path of a light beam from an objective lens (not shown) on the microscope body side.

A reflecting mirror 5 is arranged in the rotating frame 2. In this case, the rotating frame 2 and the reflecting mirror 5 are respectively located at the intersection O between the optical axis of the light beam from the objective lens and the reflecting surface of the reflecting mirror 5.
Is supported so as to be rotatable about a rotation axis.
In conjunction with the rotation of the rotating frame 2, the reflecting mirror 5 is rotated in the same direction by half the rotation angle α.

An image forming lens 6, a trapezoidal prism 7, and a triangular prism 8 are arranged on the rotating frame 2. The imaging lens 6 converts the light beam from the objective lens deflected by the reflecting mirror 5 into an image plane P of an eyepiece 9 described later in the binocular tube 3.
An image is formed on the image. Further, the trapezoidal prism 7 and the triangular prism 8 are integrally joined so as to guide the light beam emitted from the imaging lens 6 to the binocular tube 3. In this case, the triangular prism 8 is
The light beam reflected twice is reflected twice more, and one of these two reflection surfaces is configured to also serve as an emission surface. Further, the surface serving as both the reflection surface and the emission surface is disposed so as to be substantially perpendicular to the lens barrel mounting surface.

The optical axis of the light beam passing through the prism 4, the reflecting mirror 5, the imaging lens 6, the trapezoidal prism 7, and the triangular prism 8 is formed on the same plane (paper surface) including the optical axis of the objective lens. I have.

The binocular tube 3 is provided with an eyepiece 9 having an image plane P. The eyepiece 9 is composed of a pair of right and left, but only one eyepiece 9 is shown in the drawing.

An optical path dividing element for dividing the optical path into right and left is formed inside the binocular tube 3, but the details thereof are omitted here. Next, the operation of the embodiment configured as described above will be described.

Now, when a light beam from a microscope body (not shown) enters through the prism 4 near the mounting portion 1a of the fixed frame 1, the light beam is deflected by the reflecting mirror 5 and enters the imaging lens 6. The light transmitted through the imaging lens 6 is reflected once by the trapezoidal prism 7, and further reflected by the triangular prism 8.
The reflected light is introduced into the binocular tube 3 and is focused on the image plane P of the eyepiece 9 to observe an enlarged image.

In this case, the light beam from the trapezoidal prism 7 is
Since the triangular prism 8 for reflecting the light is configured so that one of the two reflecting surfaces also serves as the exit surface, that is, by having a surface that also serves as the reflecting surface and the exit surface, the spectral path length can be shortened. Even if the diameter of the luminous flux between the imaging lens 6 and the binocular tube 3 is increased, the optical path can be configured.

The fact that the diameter of the light beam can be increased allows the effective diameter of the imaging lens 6 to be increased, so that the distance between the objective lens on the microscope body side and the imaging lens 6 can be increased. Therefore, even if an additional device such as an epi-illumination fluorescent illumination device is inserted into the optical path, it is possible to observe the microscope with a large field of view.

Also, without the need for a conventional relay lens,
Since a single imaging lens 6 can be used, the configuration can be simplified and the cost can be reduced. Further, when the angle of depression of the binocular tube portion 3 is changed by α, the reflecting mirror 5 rotates in the same direction by α / 2 in conjunction with the angle, so that the observation image does not move and is continuously displayed. Thus, the height Z of the eye point E can be changed. In this case, the distance from the rotation center O of the reflecting mirror 5 to the eye point E can be set large, so that a large change in the height Z of the eye point E can be obtained only by a small change in the angle of oblique viewing of the binocular tube 3. it can.

Furthermore, a triangular prism 8 which reflects twice.
Are arranged so that their longitudinal directions are almost perpendicular, the height Y from the lens barrel mounting surface to the eye point E can be set large. This is because, in recent years, it has been desired that an observation posture in a state in which the face of the face is straight and the downward viewing angle is almost horizontal rather than a posture in which the face is tilted and looked into when performing microscopic observation. In order to observe with the microscope, it was necessary to increase the height Y of the eye point E and to increase the distance X from the optical axis of the objective lens to the eye point E. These conditions can also be satisfied by combining the fact that it can be separated from the lens 6.

By inserting a beam splitter in the optical path instead of the prism 4 attached to the fixed frame 1 of the first embodiment, a photographic optical path can be provided at the rear of the lens barrel. (Second Embodiment) FIG. 2 shows a schematic configuration of a second embodiment, and the same parts as those in FIG. 1 are denoted by the same reference numerals.

In this case, the positional relationship between the trapezoidal prism 7 and the triangular prism 8 is reversed. That is, the imaging lens 6
Immediately after the above, a trapezoidal prism 7 is arranged between the triangular prism 8 and the binocular tube 3, and the light beam from the imaging lens 6 is reflected twice by the triangular prism 8,
The light is reflected once by the trapezoidal prism 7. In this case, the triangular prism 8 is configured so that one of the two reflecting surfaces also serves as the incident surface, and the surface that also serves as the reflecting surface and the incident surface is substantially perpendicular to the lens barrel mounting surface. Are located.

Accordingly, with such a configuration, the appointment height Y can be configured to be higher than in the first embodiment. In addition, the same effects as described in the first embodiment can be expected. (Third Embodiment) FIG. 3 shows a schematic configuration of a third embodiment, and the same parts as those in FIG. 1 are denoted by the same reference numerals.

In this case, instead of the trapezoidal prism 7 and the triangular prism 8, a triangular prism 10 for reflecting the optical path three times is provided. In this case, the triangular prism 10 is configured so that the second reflecting surface of the three reflecting surfaces also serves as the emitting surface. Further, the binocular tube portion 3 is attached to the rotating frame 2 with a 180 ° upside down direction.

Therefore, according to such a configuration, the optical path between the imaging lens 6 and the binocular tube 3 can be constituted by a single triangular prism 10 reflecting three times, which is necessary for the optical path configuration. The optical path length can be further reduced, and the manufacturing cost can be reduced. Further, the binocular tube 3 is moved up and down 18
The appointment height Y can be configured to be high by attaching to the rotating frame 2 in a direction opposite to 0 °. In addition, the same effects as described in the first embodiment can be expected.

The three-time reflection triangular prism 10 in this embodiment is divided along a line 10a in FIG.
It can also be constituted by a triangular prism and a right-angle prism with a round reflection.

[0033]

As described above, according to the present invention, the optical path length can be shortened, and the optical path can be formed even if the diameter of the light beam between the imaging lens and the binocular tube is increased. Since the beam diameter can be increased, the effective diameter of the imaging lens can be increased, and a large space for providing an additional device such as an epi-illumination fluorescent device between the microscope body and the imaging lens can be secured. it can.

Further, since the three-reflection triangular prism can be constituted by one, the optical path length required for the optical path configuration can be further shortened and the manufacturing cost can be reduced. Further, since the mounting direction of the binocular tube can be reversed by 180 °, the height of the eye point can be increased,
The observation posture of the observer can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a schematic configuration of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed frame 1a ... Mounting part 2 ... Rotating frame 3 ... Binocular tube part 4 ... Prism 5 ... Reflecting mirror 6 ... Imaging lens 7 ... Trapezoid prism 8 ... Triangular prism 9 ... Eyepiece 10 ... Triangular prism

Claims (3)

[Claims] 1. A variable viewing angle lens barrel for a microscope in which a rotating frame having a binocular tube is rotatably provided with respect to a fixed frame attached to a microscope main body, wherein the rotating frame rotates in conjunction with the rotation of the rotating frame. A first reflecting member provided so as to be rotated in the same direction by half the angle, and a first reflecting member for deflecting a light beam from the microscope main body; and a first reflecting member provided on the rotating frame. A second reflection member and a third reflection member configured to guide the light flux to the binocular tube, and the first reflection member provided in an optical path between the first and second reflection members. And an image forming lens for forming an image of the light beam from the microscope main body deflected in the inside of the binocular tube, and at least one of the reflecting surfaces of the second reflecting member and the third reflecting member. So that the surface also serves as the entrance or exit surface. Microscope 俯視 tilting barrel, characterized in that. 2. The second reflecting member and the third reflecting member each include one triangular prism having a reflecting surface that reflects a light beam three times, and one of the three reflecting surfaces is an emission surface. 2. The variable viewing angle lens barrel for a microscope according to claim 1, wherein said lens barrel also serves as 3. A binocular tube provided on the rotating frame,
3. The lens barrel according to claim 1 or 2, wherein the lens barrel can be mounted in the opposite direction by 180 [deg.].