JP3498914B2 - Relay optics - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay optical system used for capturing an image formed by an objective lens with an electronic image capturing camera or the like.

[0002]

2. Description of the Related Art As means for recording an image formed by an objective lens of a microscope, there are photographing with a silver salt camera and photographing with a television camera. Among them, the sample image was recorded on the film when the image was taken with the silver salt camera.

On the other hand, an image pickup method using a television camera is disclosed in Japanese Patent Application Laid-Open No. 6-331903, and here, a television camera connecting mirror including an eyepiece observation lens barrel, an adapter, a television camera attachment, and an image pickup section of the television camera. A tube is shown. Although the image pickup device is not specifically described, for example, a solid-state image pickup device (CCD) is used.

Conventionally, the number of pixels of a solid-state image pickup device is approximately determined according to the number of scanning lines of a television monitor. For example, in the case of the standard system (NTSC), for example, 512 × 512.
Pixels or 640 × 512 pixels, for example, 1024 × 768 pixels for high definition.

[0005]

As described above, in the photography so far, the specimen image was recorded on the film, but in recent years, a solid-state image pickup device has been used instead of the film as a recording medium. Digital cameras have appeared and have begun to spread. The characteristic of this digital camera is that the number of pixels is large relative to the area of the solid-state image sensor. In the early days, it was several hundreds of thousands of pixels with a 1/3 inch size, but nowadays it is 2/3.
Inch size or 1/2 inch size 100 to 2
It has a pixel number of 1,000,000 pixels or more.

However, in the digital camera, the taking lens is fixed to the camera body, and the entrance pupil position exists inside the taking lens or inside the digital camera body. Therefore, if you try to use it in combination with a microscope to capture a sample image, the digital camera body is adjusted to match the exit pupil position of the microscope (or a position conjugate with the exit pupil position) and the entrance pupil position of the digital camera. It must be located close to the lens barrel. As a result, there arises a problem that the microscope and the digital camera structurally interfere with each other. Incidentally, JP-A-2-222914 and JP-A-6-
175046, JP-A-10-39235,
Japanese Unexamined Patent Application Publication No. 11-133314 discloses an optical system for observing an image (intermediate image) formed by an objective lens, but these are based on the assumption that they are observed by the human eye. It is difficult to use as a relay optical system for an image pickup device.

An object of the present invention is to provide a relay optical system which enables an image pickup device to be mounted on a microscope without causing structural interference between the microscope and the image pickup device when a sample image is taken by the image pickup device. To do.

[0008]

To achieve the above object, a relay optical system according to a first aspect of the present invention has a negative refracting power which is arranged in order from an intermediate image forming position to an exit side. In a relay optical system composed of one group and a second group having a positive refractive power, the first group is a biconcave single lens .
Rannahli, the second group has a first biconvex single lens, disposed on the exit side of the first double-convex lens, biconcave lens and a biconvex lens, a meniscus cemented lens directing the convex surface facing the exit side, It and a second biconvex single lens as a final lens disposed on the exit side of the meniscus cemented lens
Further , the following condition (1) is satisfied, and the distance from the exit side surface of the second biconvex single lens to the exit pupil position is 30 mm or more. 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system. The relay optical system according to claim 2 is composed of a first group having a negative refracting power and a second group having a positive refracting power, which are arranged in order from an intermediate imaging position to an exit side. In the system, the first group includes a biconcave single lens , and the second group includes a biconvex cemented lens including a biconvex lens and a negative meniscus lens , or a positive meniscus lens and a negative meniscus lens.
Meniscus lens with convex surface facing the injection side
'S and, disposed on the exit side of the biconvex cemented lens or meniscus cemented lens <br/>, and a positive meniscus <br/> Kas single lens directing the convex surface facing the exit side, disposed on the exit side of the positive meniscus single lens and a double-convex single lens that is, the following condition (2) (3) (4) satisfied, that the distance to the exit pupil position from the exit surface of the second single bi-convex lens is 30mm or more Is characterized by. 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system. The relay optical system according to claim 3 is composed of a first group having a negative refracting power and a second group having a positive refracting power, which are arranged in order from an intermediate imaging position to an exit side. In the system, the first group includes a biconcave lens and a biconvex lens, and a first meniscus cemented lens having a convex surface facing the exit side.
From it, the second group consists of a biconcave lens and a biconvex lens, and a second meniscus cemented lens directing the convex surface facing the exit side, and a biconvex single lens disposed on the exit side of the second meniscus cemented lens Consists of the following conditions (1)
And the distance from the exit side surface of the biconvex lens to the exit pupil position is 30 mm or more. 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system. The relay optical system according to claim 4 is configured by a first group having a negative refracting power and a second group having a positive refracting power, which are arranged in order from an intermediate imaging position to an exit side. in the system, the first group consists biconcave lens, from the second group, the first single bi-convex lens, is arranged on the exit side of the first double-convex lens, a biconcave lens and a biconvex lens made, consists of a meniscus cemented lens directing the convex surface facing the exit side, a second single bi-convex lens as a final lens disposed on the exit side of the meniscus cemented lens, the following condition (2) (3) (4) And the distance from the exit side surface of the second biconvex single lens to the exit pupil position is 30 mm or more. -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position. A relay optical system according to a fifth aspect of the present invention is the first optical system having a negative refracting power, which is arranged in order from the intermediate imaging position to the exit side.
In a relay optical system including a group and a second group having a positive refractive power, the first group includes a biconcave single lens .
Ri, the second group, biconvex cemented lens consisting of a biconvex lens and a negative meniscus lens or a positive meniscus lens
A negative meniscus lens with a convex surface facing the exit side
Scus cemented lens and this biconvex cemented lens or meniscus
Arranged from scrap cemented lens on the exit side and a positive meniscus single lens directing the convex surface facing the exit side, and a biconvex single lens disposed on the exit side of the positive meniscus single lens,
The following conditions (2), (3) and (4) are satisfied, and the distance from the exit side surface of the second biconvex single lens to the exit pupil position is 30.
It is characterized by being mm or more. -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position. A relay optical system according to a sixth aspect of the present invention is the first optical element having a negative refracting power, which is arranged in order from the intermediate imaging position to the exit side.
And the group, in the positive relay optical system composed of a second group having a refractive power, the first group consists of a biconcave lens and a biconvex lens, it comprises a first meniscus cemented lens directing the convex surface facing the exit side the second group consists of a biconcave lens and a biconvex lens consists of a second meniscus cemented lens directing the convex surface facing the exit side, and a biconvex single lens disposed on the exit side of the meniscus cemented lens, the following The conditions (2), (3) and (4) are satisfied, and the distance from the exit side surface of the biconvex single lens to the exit pupil position is 30 mm or more. -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position
Is.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on illustrated examples. Each of the embodiments is composed of a first group having a negative refracting power and a second group having a positive refracting power, which are sequentially arranged on the exit side from the intermediate imaging position. In the first configuration, the first group having negative refracting power is composed of a single lens, and the second group having positive refracting power is composed of two cemented lenses arranged in order from the intermediate image forming position toward the exit side. It consists of a positive lens. Also, in the second configuration,
The first group having negative refracting power is also composed of a single lens,
The second group having a positive refractive power is composed of a positive lens, a cemented lens, and a positive lens which are sequentially arranged from the intermediate image forming position toward the exit side. In the third configuration, the first group having negative refracting power is composed of a negative cemented lens, and the second group having positive refracting power is cemented in order from the intermediate image forming position toward the exit side. It consists of a lens and a positive lens. Here, it is desirable that the first to third configurations satisfy the following condition (1). 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system.

In condition (1), when the value of L / f becomes smaller than the lower limit value of 0.3, the number of lenses becomes small, and it is difficult to satisfactorily correct the aberration of the relay optical system. Further, when the value exceeds the upper limit value of 1.25, it becomes difficult to secure a necessary distance to the exit pupil position. Therefore, it is more desirable to satisfy the following condition (1 ′). 0.50 ≦ L / f ≦ 1.25 (1 ′) The lower limit of condition (1 ′) may be set to 0.6. In the first to third configurations, the following condition (2)
It is desirable to satisfy (4) to (4). -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position.

In the condition (2), when the value of f1 / f becomes smaller than the lower limit value of -2, the refractive power of the first lens unit becomes weak, the Petzval sum cannot be made small, and the field curvature is sufficiently reduced. Can not be corrected to. When the value exceeds the upper limit of -0.2, the refractive power of the first lens group becomes large, and it becomes difficult to satisfactorily correct the aberration of the entire relay optical system, and the lens outer diameter of the second lens group becomes large. Will become bigger.

Further, in the condition (3), when the value of f2 / f becomes smaller than the lower limit value of 0.45, the refracting power of the second group becomes strong, and accordingly, the refracting power of the first group also becomes strong. In this case, since the amount of aberration generated in each of the first group and the second group becomes large, spherical aberration and field curvature cannot be canceled by the first group and the second group, and it becomes difficult to correct aberrations in a well-balanced manner. . In addition, if it exceeds the upper limit of 1.2 and becomes large, the second
The refractive power of the group becomes weaker, and the refractive power of the first group becomes weaker accordingly. As a result, the negative refractive power becomes insufficient, and it becomes difficult to effectively correct the field curvature.

In the condition (4), the value of d _EXP / f becomes smaller than the lower limit value of 1 or becomes smaller than the upper limit value of 2.
When the size is larger than 5, it becomes difficult to dispose the imaging device at a proper position in good balance when used in combination with a microscope. It should be noted that d _EXP is a value when the entrance pupil position of the relay optical system is at approximately infinity.

FIG. 1 shows a microscope in which the relay optical system of the present invention is used. In the figure, 1 is a microscope main body, 2 is an observation lens barrel, 3 is a relay optical system, 4 is a first holding member for holding the relay optical system 3, 5 is a second holding member, and 6 is a digital camera (electronic Reference numeral 8 denotes an entrance pupil of the built-in photographing lens 6A. Further, 11 is a revolver, 12 is an objective lens, and 13 is a stage on which the sample S is mounted.

The lower part of the observation lens barrel 2 is installed on the upper surface of the mirror body 1, and the observation optical path 2A for visually observing the image of the sample S and the digital camera 6 are provided inside the observation lens barrel 2. Has a photographing optical path 2B. An eyepiece lens 9 is arranged on the observation optical path 2A of the observation lens barrel 2 so that observation can be performed by the observer's eyes. Observation optical path 2A and shooting optical path 2B
The switching is performed by operating a switching lever (not shown) and inserting / removing the prism 10 in / from the optical path. Further, I is an intermediate image of the sample, which is formed outside the observation lens barrel 2.

A first holding member 4 is provided on the upper part of the observation lens barrel 2, and the first holding member 4 is connected to the observation lens barrel 2 via a lower end 4A thereof. The first holding member 4 has a cylindrical shape, and the relay optical system 3 is arranged inside thereof.

The relay optical system 3 is disposed near the upper end 4B of the first holding member 4, and the sample image I has its front focus position,
Alternatively, it is held inside the first holding member 4 so as to match the vicinity thereof. Therefore, the light from each point of the sample image I enters the digital camera 6 as a parallel light beam or a substantially parallel light beam by the relay optical system 3. The relay optical system 3 allows the exit pupil of the microscope (or its conjugate point) and the entrance pupil 8 of the digital camera 6 to coincide or substantially coincide with each other.

A second holding member 5 is provided above the first holding member 4.
Is installed, and the upper end 4B of the first holding member 4 and the lower end 5A of the second holding member 5 are connected. The second holding member 5 is
It has a cylindrical shape like the holding member 4 of 1, but has no lens inside and is hollow.

A digital camera is provided above the second holding member 5.
6 is connected. Digital camera 6 taking lens 6A
An adapter 7 for connecting to the second holding member 5 is provided on the outer peripheral portion of the end portion of the adapter 7 and the second holding member 5.
Is connected to the upper end 5B of the. Note that the digital camera 6 may be directly connected to the second holding member 5 if structurally possible.

Incidentally, a screw mechanism, a round dovetail mechanism or the like is conventionally used to connect the respective members such as the connection between the main body 1 and the observation lens barrel 2 and the connection between the second holding member 5 and the adapter 7. The mechanism is appropriately selected and used.

Further, the relay optical system 3 satisfies the following condition (5). 30 mm ≦ d _EXP (5) where d _EXP is the distance from the final lens surface of the second group to the entrance pupil position of the relay optical system 3.

When the distance d _EXP becomes smaller than the lower limit of 30 mm, when the position of the exit pupil of the relay optical system 3 and the position of the entrance pupil of the taking lens 6A of the digital camera 6 are made to coincide with each other, the observation lens barrel is used. The distance between the digital camera 6 and the digital camera 2 is shortened, and a structural walk occurs. Further, when a digital camera having a taking lens with a long focal length difficulty is connected, the incident pupil of such a digital camera is located near the image pickup element, so that there is a problem that a peripheral image ray is eclipsed. .

The relay optical system 3 preferably further satisfies the following condition (6). 60 mm ≤ d _EXP ≤ 160 mm (6) That is, when the distance d _EXP exceeds the upper limit of 160 mm, the distance from the observation lens barrel 2 to the digital camera 6 becomes too large, resulting in poor stability and sharp sample image capturing. Can not. In addition, it is difficult to increase the magnification of the relay optical system 3, and there is a problem in that it is impossible to take an image up to the viewable angle of view that the taking lens 6A of the digital camera 6 originally has without being shaken. Occurs.

Since the relay optical system 3 according to the present invention satisfies the above condition (6), the digital camera 6 and the observation lens barrel 2 can be separated from each other without impairing the stability. Therefore, a stable specimen image can be taken without causing structural interference. In addition, since the optical system optically matches the optical characteristics of the taking lens 6A of the digital camera, it is possible to obtain a good sample image without vignetting over the entire taking range.

The relay optical system 3 has the following condition (7).
It is desirable to satisfy. 90 mm ≦ d _EXP ≦ 160 mm (7) Furthermore, it is desirable that the relay optical system 3 satisfy the following condition (8). 90mm ≦ d _EXP ≦ 130mm (8)

As described above, the digital camera 6 is connected to the microscope by the first holding member 4, the second holding member 5 and the adapter 7. Here, the 1st holding member 4, the 2nd holding member 5, and the adapter 7 are manufactured substantially exactly so that it may become predetermined length.

On the other hand, the length from the tip of the member that holds the taking lens 6A to the main body of the digital camera 6 is not so precise as compared with the adapter and the holding member. Therefore, when the digital camera 6 is attached to the adapter 7, the position of the taking lens 6A when the end face of the adapter 7 on the digital camera 6 side is used as a reference is slightly different from the originally assumed position. As a result, even if the sample is brought into focus through the eyepiece lens, a focused image is not necessarily formed on the image pickup surface of the digital camera 6.

In this case, since the digital camera 6 is provided with a display device for a monitor, for example, a liquid crystal display screen, the observer can adjust the focus while watching the image displayed on the liquid crystal display screen. However, since the distance from the liquid crystal display screen to the focusing knob of the microscope body becomes long, it becomes difficult to adjust the focus.

In such a case, if the autofocus function of the digital camera 6 is used, the parfocal adjustment of the digital camera 6 with respect to the eyepiece image can be performed more accurately and easily. In particular, it is advantageous in the following cases. Focusing is difficult when shooting with a low-magnification objective lens, and it is quite difficult to adjust the focus by operating the focusing knob of the microscope body while looking at the liquid crystal display screen for the monitor. However, if you focus the eyepiece image in the same way as described above, you can focus on it with an eyepiece that is close to the focusing knob of the microscope body and provides a high-quality image with good operability. If only done, the image recorded on the digital camera 6 is also focused at the same time.

The photographing lens 6A is used for focus adjustment.
Position, the projected pupil position and the shooting lens 6A
However, since there is a slight deviation from the predetermined position of the taking lens 6A, a large problem does not occur.

Example 1 FIG. 2 shows a first example of the relay optical system 3 according to the present invention. The present embodiment is a relay optical system of the first configuration, in which the first lens group G1 having negative refractive power is composed of a biconcave lens, and the second lens group G2 having positive refractive power is from the intermediate image position side to the exit pupil position E.
It is composed of a biconvex lens, a cemented lens and a biconvex lens which are arranged in this order toward the XP side.

The numerical data of this embodiment are shown below. Where R is the radius of curvature of each lens surface, T is the wall thickness or air gap of each lens, nd is the refractive index of each lens at the d-line, and νd is the Abbe number of each lens, These are also commonly used in each of the embodiments described later. However, INF on the first surface is the intermediate image formation position, and INF on the ninth surface is
Indicates the exit pupil position EXP, respectively.

Surface number (r) R T nd νd 1 INF 16.525 2 -161.132 4.000 1.67270 32.1 3 59.307 3.834 4 164.121 11.500 1.51633 64.1 5 -17.261 5.000 1.67270 32.1 6 -70.640 0.897 7 -146.124 8.500 1.69100 54.8 8 -42.677 1.179 9 83.910 9.000 1.48749 70.2 10 -70.958 60.042 11 INF FIG. 3 is an aberration curve diagram showing spherical aberration, astigmatism, and distortion in this example.

Embodiment 2 FIG. 4 shows a second embodiment of the relay optical system 3 according to the present invention. In this embodiment, as in the first embodiment, the first lens group G1 having negative refractive power is composed of a biconcave lens, and the second lens group G having positive refractive power.
Reference numeral 2 denotes a cemented lens in which a biconvex lens, a negative meniscus lens, a positive meniscus lens, and a biconvex lens are arranged in this order from the intermediate image position side toward the exit pupil position EXP side. The numerical data of this example are shown below.

Surface number (r) R T nd νd 1 INF 13.760 2 -48.961 6.322 1.67270 32.1 3 56.714 3.801 4 1127.439 13.001 1.51633 64.1 5 -18.977 5.650 1.74077 27.8 6 -51.619 0.891 7 -116.867 10.241 1.69100 54.8 8 -40.394 1.012 9 107.267 10.501 1.48749 70.2 10 -74.855 90.02 11 INF Note that each aberration curve in this example is almost the same as each aberration curve in Example 1 and can be calculated by ray tracing from the above data, and therefore is not shown. .

Example 3 FIG. 5 shows a third example of the relay optical system 3 according to the present invention. In the second embodiment, the first group G1 having a negative refractive power is composed of a biconcave lens, and the second group G2 having a positive refractive power is a positive meniscus lens from the intermediate image position side to the exit pupil position EXP side, Of meniscus lenses, a cemented lens arranged in this order, a positive meniscus lens, and a biconvex lens. The numerical data of this example are shown below.

Surface number (r) R T nd νd 1 INF 23.944 2 -29.587 6.636 1.67270 32.1 3 55.474 3.800 4 -8532.319 13.001 1.51633 64.1 5 -23.530 5.651 1.67270 32.1 6 -76.030 0.891 7 -116.940 10.241 1.69100 54.8 8 -42.171 0.997 9 110.106 12.000 1.48749 70.2 10 -75.694 159.930 11 INF Each aberration curve in this example is almost the same as each aberration curve in Example 1 and can be calculated by ray tracing from the above data, and therefore is not shown.

Example 4 FIG. 6 shows a fourth example of the relay optical system 3 according to the present invention. The present embodiment is a relay optical system having a second configuration, in which the first group G1 having a negative refractive power is composed of a biconcave lens, and the second group G2 having a positive refractive power is from the intermediate image position side to the exit pupil position E.
It is composed of a biconvex lens, a biconcave lens and a biconvex lens which are arranged in this order toward the XP side, and a biconvex lens. The numerical data of this example are shown below.

Surface number (r) R T nd νd 1 INF 13.679 2 -26.706 5.965 1.69895 30.1 3 74.140 1.987 4 139.326 12.000 1.48749 70.2 5 -27.722 5.356 6 -92.405 8.390 1.80518 25.4 7 513.709 12.000 1.71300 53.9 8 -61.407 2.635 9 74.608 12.000 1.48749 70.2 10 -105.704 90.029 11 INF FIG. 7 is an aberration curve diagram showing spherical aberration, astigmatism, and distortion in this example.

Embodiment 5 FIG. 8 shows a relay optical system 3 according to a fifth embodiment of the present invention. Also in this embodiment, as in the case of the fourth embodiment, the first lens unit G1 having negative refractive power is composed of a biconcave lens, and the second lens unit G having positive refractive power.
Reference numeral 2 is composed of a biconvex lens, a biconcave lens, and a cemented lens in which a biconvex lens and a biconvex lens are arranged in this order from the intermediate image position side toward the exit pupil position EXP side. The numerical data of this example are shown below.

Surface number (r) R T nd νd 1 INF 19.510 2 -17.412 6.237 1.66680 33.0 3 68.007 1.984 4 186.835 12.000 1.49700 81.5 5 -27.475 5.338 6 -65.184 8.384 1.69895 30.1 7 6455.163 12.000 1.71999 50.2 8 -56.655 2.554 9 82.158 12.000 1.49700 81.5 10 -121.624 159.616 11 INF Each aberration curve in this example is almost the same as each aberration curve in example 4, and since it can be calculated from the above data by ray tracing, illustration is omitted.

Sixth Embodiment FIG. 9 shows a sixth embodiment of the relay optical system 3 according to the present invention. The present embodiment is a relay optical system having a third configuration, in which the first group G1 having a negative refractive power is composed of a biconcave lens and a biconvex lens cemented in order from the intermediate image position side toward the exit pupil position EXP side. The second group G2 having a positive refractive power is composed of a cemented biconcave lens and a biconvex lens, and a biconvex lens. The numerical data of this example are shown below.

Surface number (r) R T nd νd 1 INF 15.872 2 -23.730 5.936 1.69895 30.1 3 47.648 13.000 1.48749 70.2 4 -28.792 5.218 5 -123.019 7.456 1.74077 27.8 6 381.794 12.000 1.71300 53.9 7 -62.976 2.702 8 67.135 12.000 1.48749 70.2 9 -130.910 90.018 10 INF FIG. 10 is an aberration curve diagram showing spherical aberration, astigmatism, and distortion in this example.

Seventh Embodiment FIG. 11 shows a seventh embodiment of the relay optical system 3 according to the present invention. In this embodiment, as in the sixth embodiment, the first lens group G1 having a negative refractive power is composed of a cemented biconcave lens and a biconvex lens in order from the intermediate image position side to the exit pupil position EXP side, and has a positive refractive power. The second lens group G2 includes a cemented biconcave lens and a biconvex lens, and a biconvex lens. The numerical data of this example are shown below.

Surface number (r) R T nd νd 1 INF 19.914 2 -19.999 7.000 1.69895 30.1 3 47.061 14.000 1.48749 70.2 4 -27.329 5.207 5 -107.890 7.453 1.6398 34.5 6 178.145 12.000 1.71999 50.2 7 -72.924 2.626 8 71.985 11.997 1.48749 70.2 9 -154.063 120.725 10 INF The aberration curves in this example are almost the same as the aberration curves in example 6 and can be calculated from the above data by ray tracing, so the illustration is omitted.

Further, the values of the conditional expressions in each of the above embodiments are collectively displayed below. IM.H represents the size of the intermediate image, and NA represents the numerical aperture on the incident side (intermediate image side).

[0047]

As described above, according to the present invention, when a sample image is captured by the image pickup device, the image pickup device can be attached to the microscope without structural interference between the microscope and the image pickup device. A relay optical system can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a microscope in which a relay optical system of the present invention is used.

FIG. 2 is a sectional view taken along the optical axis of the first embodiment of the relay optical system according to the present invention.

FIG. 3 is an aberration diagram in Example 1.

FIG. 4 is a sectional view taken along the optical axis of a second embodiment of the relay optical system according to the present invention.

FIG. 5 is a sectional view taken along the optical axis of a third embodiment of the relay optical system according to the present invention.

FIG. 6 is a sectional view taken along the optical axis of a fourth embodiment of the relay optical system according to the present invention.

FIG. 7 is an aberration diagram in Example 4.

FIG. 8 is a sectional view taken along the optical axis of a fifth embodiment of the relay optical system according to the present invention.

FIG. 9 is a sectional view taken along the optical axis of a sixth embodiment of the relay optical system according to the present invention.

FIG. 10 is an aberration diagram in Example 6.

FIG. 11 is a sectional view taken along the optical axis of a seventh embodiment of the relay optical system according to the present invention.

[Explanation of symbols]

1 Microscope body 2 Observation barrel 3 relay optical system 4 First holding member 5 Second holding member 6 Electronic imaging camera (digital camera) 7 adapter 8 Digital camera built-in photography lens entrance pupil 9 eyepiece 10 prism 11 Revolver 12 Objective lens 13 stages S sample Intermediate image of I specimen

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Claims (6)

(57) [Claims] 1. A relay optical system comprising a first group having a negative refracting power and a second group having a positive refracting power, which are arranged in order from an intermediate imaging position to an exit side, The first group is composed of a biconcave single lens , and the second group is the first group.
A biconvex single lens of the first is disposed on the exit side of the single bi-convex lens, biconcave lens and a biconvex lens, a meniscus cemented lens directing the convex surface facing the exit side, disposed on the exit side of the meniscus cemented lens consists of a second biconvex single lens becomes to the final lens, and satisfies the following condition (1), that the distance to the exit pupil position from the exit surface of the second single bi-convex lens is 30mm or more Relay optical system characterized by. 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system. 2. A relay optical system comprising a first group having a negative refracting power and a second group having a positive refracting power, which are arranged in order from an intermediate image forming position to an exit side, The first group includes a biconcave single lens , and the second group includes a biconvex cemented lens including a biconvex lens and a negative meniscus lens , or a positive meniscus lens and a negative meniscus lens.
Meniscus cemented lens with convex surface facing the exit side
When, the biconvex cemented lens or disposed meniscus cemented lens by <br/> Ri exit side, and a positive Menisuka <br/> scan single lens directing the convex surface facing the exit side, disposed on the exit side of the positive meniscus single lens and a double-convex single lens that is, the following condition (1)
And a distance from the exit side surface of the biconvex single lens to the exit pupil position is 30 mm or more. 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system. 3. A relay optical system comprising a first group having a negative refracting power and a second group having a positive refracting power, which are sequentially arranged from an intermediate image forming position to an exit side, one group consists of a biconcave lens and a biconvex lens, the first meniscus cemented lens directing the convex surface facing the exit side Tona
Ri, from the second group consists of a biconcave lens and a biconvex lens, and a second meniscus cemented lens directing the convex surface facing the exit side, and a biconvex single lens disposed on the exit side of the second meniscus cemented lens The relay optical system satisfies the following condition (1) and the distance from the exit side surface of the biconvex lens to the exit pupil position is 30 mm or more. 0.3 ≦ L / f ≦ 1.25 (1) where L is the total length of the relay optical system, the distance from the lens surface on which light first enters to the lens surface on which light exits last, and f is the above It is the focal length of the relay optical system. 4. A relay optical system comprising a first group having a negative refracting power and a second group having a positive refracting power, which are arranged in order from an intermediate imaging position to an exit side, one group consists biconcave lens, the second group, the first single bi-convex lens, is arranged on the exit side of the first double-convex lens, biconcave lens and a biconvex lens, the exit side It is composed of a meniscus cemented lens having a convex surface facing it and a second biconvex single lens which is disposed on the exit side of this meniscus cemented lens and serves as a final lens, and the following condition (2):
(3) A relay optical system satisfying (4), wherein the distance from the exit side surface of the second biconvex single lens to the exit pupil position is 30 mm or more. -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position. 5. A relay optical system comprising a first group having a negative refracting power and a second group having a positive refracting power, which are sequentially arranged from an intermediate image forming position to an exit side,
The first group is composed of a biconcave single lens , and the second group is
Biconvex cemented lens consisting of biconvex lens and negative meniscus lens , or positive meniscus lens and negative meniscus lens
Meniscus cemented lens with convex surface facing the exit side
When, the biconvex cemented lens or disposed meniscus cemented lens by <br/> Ri exit side, and a positive Menisuka <br/> scan single lens directing the convex surface facing the exit side, disposed on the exit side of the positive meniscus single lens And the following condition (2)
(3) A relay optical system satisfying (4), wherein the distance from the exit side surface of the second biconvex single lens to the exit pupil position is 30 mm or more. -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position. 6. A relay optical system comprising a first group having a negative refracting power and a second group having a positive refracting power, which are sequentially arranged from an intermediate image forming position to an exit side,
The first group consists of a biconcave lens and a biconvex lens, the first meniscus cemented lens directing the convex surface facing the exit side Tona
Ri, the second group consists of a biconcave lens and a biconvex lens consists of a second meniscus cemented lens directing the convex surface facing the exit side, and a biconvex single lens disposed on the exit side of the meniscus cemented lens, the following Conditions (2) (3)
A relay optical system satisfying the condition (4), wherein the distance from the exit side surface of the biconvex single lens to the exit pupil position is 30 mm or more. Relay optics. -2 ≤ f1 / f ≤ -0.2 (2) 0.45 ≤ f2 / f ≤ 1.2 (3) 1 ≤ d _EXP / f ≤ 2.5 (4) where f is the relay optical system Focal length, f1 is the focal length of the first group, f2 is the focal length of the second group, d _EXP
Is the distance from the final lens surface of the second group to the exit pupil position.