JP2003344779A - Image display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display in which an image having a high resolution and a long depth of focus is available. <P>SOLUTION: The image display is provided with an object optical system 8 which emits an afocal luminous flux on the basis of a luminous flux emitted from an object to be detected 7, a varying means of luminous flux diameter 30 which passes a part of the afocal luminous flux and varies the diameter of the passed afocal luminous flux, an image capturing means 50 which captures optical images on the basis of the afocal luminous flux passed through the varying means of luminous flux diameter 30, in which the captured images successively vary corresponding to the variation of the diameter of the afocal luminous flux, an image superimposing means 21 which classifies the successively varying images for every diameter of the afocal luminous flux and superimposes the classified images, a superimposing ratio setting means 25 which sets the ratio of image superimposing, and an image display means 60 which displays the image superimposed by the image superimposing means 21. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an image display device.

[0002]

2. Description of the Related Art In recent years, with the development of surgical methods and surgical tools, fine surgery, so-called microsurgery, has been frequently performed. For this microsurgery, a surgical microscope for magnifying and observing the surgical site is used, as in the case of ophthalmology and neurosurgery. By the way, for example, in the treatment of the dura mater seen in skull base surgery in neurosurgery, the operator observes the magnified observation of the fine tissue at the bottom of the barhole provided in the patient's head and Also requires a relatively wide range of treatments. That is, it is necessary to perform observations that require high resolution and observations that require long focal depth.

A surgical microscope is usually composed of a mirror body and a support mechanism for moving the mirror body to a desired position, orienting the mirror body in a desired direction, and holding the mirror body in this state. In general, a microscope body of an optical microscope includes an objective optical system that receives a light beam from an operation site and emits an afocal light beam, and an aperture stop (hereinafter referred to as an aperture stop) arranged on the afocal light beam from the objective optical system. AS), an image forming optical system for forming an image of the light flux passing through the AS at a predetermined position, and an eyepiece optical system for magnifying and observing an intermediate image formed by the image forming optical system.

A microscope different from such a microscope is disclosed in, for example, Japanese Patent Laid-Open No. 7-5369. This microscope consists of an objective optical system that receives a light beam from the surgical site and emits an afocal light beam, an AS arranged on the east side of the afocal light from the objective optical system, and a light beam that has passed through the AS at a predetermined position. An image forming optical system for forming an image, an observation optical system having an image pickup means arranged on an image forming surface of the image forming optical system, a display for displaying an image picked up by the image pickup means, and an image picked up by the image pickup means. The AS drive unit controls the AS diaphragm diameter based on the brightness of the image. The surgeon observes the image displayed on the display.

However, such a microscope has a large AS diameter when the operator needs a high resolution, and has a small AS diameter when a long depth of focus is required. Therefore, only an observation image observed in either the former state or the latter state can be obtained.

In order to solve such a problem, there is provided a so-called deep-focusing image pickup device capable of capturing an image focused on each position of a three-dimensional object even if an optical system having a shallow depth of focus is used. Various proposals have been made. For example, the imaging device disclosed in Japanese Patent Laid-Open No. 10-257373 acquires a high-resolution and long-depth observation image by using a plurality of image information obtained by moving the focal position in the depth direction.

However, when such an image pickup apparatus is applied to a surgical microscope, it is necessary to move an optical element arranged on the image pickup optical path for moving the focus position in the depth direction. That is, since it is necessary to move this optical element while keeping an optically constant posture with respect to the optical axis of the image pickup optical path, a highly accurate drive mechanism and control are required.

[0008]

The present invention has been made in view of the above circumstances, and the object of the present invention is to:
An object of the present invention is to provide an image display device having a high resolution and easily acquiring an observation image having a deep depth of focus by using a simple configuration.

[0009]

In order to achieve the above object, an image display apparatus according to claim 1 of the present invention comprises an objective optical system which emits an afocal light beam based on a light beam from a subject. Based on the light beam diameter changing means for changing a part of the afocal light flux and changing its diameter while keeping the central axis of the passing afocal light flux constant, An image acquisition unit that acquires an image of an optical image, and images that are sequentially acquired in accordance with a change in the diameter of the afocal light beam, which are acquired by the image acquisition unit, are sequentially distributed for each diameter of the afocal light beam, and these are distributed. Image superimposing means for superimposing the images, superimposing ratio setting means for setting the superimposing ratio of these distributed images, and the images superimposed by the image superimposing means are displayed. And it includes an image display unit.

The images sequentially sorted by the diameter of the afocal light beam by the image superimposing means are an image having a high resolution and an image having a deep depth of focus. The image display means displays an image containing the information of both images. Such a display is made using a simple structure.

In the image display device according to the second aspect of the present invention, the superimposition ratio set by the superimposition ratio setting means is reflected in the display density of each image distributed by the image superimposing means.

An image display apparatus according to a third aspect of the present invention is an objective optical system that emits an afocal light beam based on a light beam from an object, a part of this afocal light beam, and an While keeping the central axis of the focal light flux constant, a light flux diameter changing means for changing the diameter thereof, an image acquiring means for acquiring an image of an optical image based on the afocal light flux passing through the light flux diameter changing means, and the image. Images acquired by the acquisition means, which sequentially change according to the change in the diameter of the afocal light flux, are sequentially sorted by the diameter of the afocal light flux, and at least one image is selected from the sorted images and the central portion of this image is selected. Is taken out, at least one image is selected from the sorted images, the peripheral portion of this image is taken out, and this central portion and this peripheral portion are combined to form one image. And an image display unit for displaying the image generated by the image generation unit. .

The image display device according to claim 3 of the present invention has the same effect as the image display device according to claim 1, and can display an image with a higher contrast.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display device according to an embodiment of the present invention will be described with reference to FIGS. First, an image display device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the configuration of the image display device. The image display device has an objective optical system 8 that emits an afocal light flux based on the light flux from the subject 7. This afocal light beam has a light beam diameter changing means 3
Lead to zero. The light flux diameter changing means 30 allows a part of the light flux guided here to pass through. The beam diameter changing means 30 has a plurality of diaphragms having different diameters. In this embodiment,
The light beam diameter changing means 30 has a diaphragm 12 having a diameter D and a diaphragm 14 having a diameter d. D> d. Aperture 1
2 and 14 are provided on a disk-shaped disc member 11. The positions of the centers of the diaphragms 12 and 14 are point-symmetric with respect to the center of the disk member 11. Aperture 12, 14
The distance between the centers of is L.

The afocal light flux that has passed through the light flux diameter changing means 30 is guided to an image acquisition means (imaging means) 50 for acquiring an image of an optical image based on the afocal light flux.
The image acquisition means 50 has an imaging optical system 9 and an image sensor 10. The image forming optical system 9 forms an image of the afocal light beam having passed through the light beam diameter changing means 30 on a predetermined image forming surface. The image pickup element 10 is arranged on this image forming plane, and converts the optical image of the subject 7 formed on this image forming plane into an electric signal. The image sensor 10 is a CCD (CHARGED COUPLED)
DEVICE) and CMD (CHARGE MODULA)
TED DEVICE). In the present embodiment, two image forming optical systems 9 and two image pickup devices 10 are provided to guide two independent images to the two eyes of the user, respectively, but one image providing system is provided. May be. Two
The two imaging optical systems 9 are arranged so that their optical axes are parallel to each other. The distance between these optical axes is L.

The structure of the light beam diameter changing means 30 will be described in detail. At the center of the disc member 11, a central shaft 16 is fixed which penetrates the disc member 11 in a direction orthogonal to the disc member 11. One end of the central shaft 16 is rotatably attached to a part 51 of the main body of the image display device. The pulley 13 is fixed to the other end of the central shaft 16. A motor 17 for rotating the disc member 11 is fixed to a part 52 of the main body of the image display device. A timing belt 15 is bridged between the pulley 20 fixed to the output rotary shaft 19 of the motor 17 and the pulley 13 in a tensioned state. A rotary encoder 18 that detects the rotation angle of the disk member 11 is attached to the motor 17.

When the disk member 11 rotates, the diaphragms 12 and 14 move with respect to the respective optical axes of the image forming optical system 9. A part of the afocal light flux guided from the objective optical system 8 to the light flux diameter changing means 30 passes through the diaphragms 12 and 14. When the diaphragm 12 is located on the optical axis of the one imaging optical system 9 and the diaphragm 14 is located on the optical axis of the other imaging optical system 9, the afocal light flux passing through the diaphragm 12 is guided to the one image sensor 10. Then, the afocal light flux that has passed through the diaphragm 14 is guided to the other image sensor 10. When the disk member 11 is further rotated and the diaphragm 14 is positioned on the optical axis of the one imaging optical system 9 and the diaphragm 12 is positioned on the optical axis of the other imaging optical system 9, the diaphragm 1
The afocal light flux passing through 4 is guided to one of the image pickup devices 10, and the afocal light flux passing through the diaphragm 12 is guided to the other image pickup device 10.

That is, when a part of the afocal light beam passes through the light beam diameter changing means 30, the light beam diameter changing means 30 is operated while the central axis of the afocal light beam passing through the light beam diameter changing means 30 is kept constant. The diameter of the passed afocal light beam is changed. The central axis of the afocal light flux that has passed through the light flux diameter changing means 30 is aligned with the optical axis of the imaging optical system 9. The image acquired by the image sensor 10 of the image acquisition unit 50 sequentially changes according to the change in the diameter of the afocal light beam.

When the diaphragm 12 is located on the optical axis of one imaging optical system 9 and the diaphragm 14 is located on the optical axis of the other imaging optical system 9, the F value of one imaging optical system 9 is set. F1 is different from the F value F2 of the other imaging optical system 9. F values F1 and F2 are F1 = S / D F2 = S / d, where S is the focal length of each imaging optical system 9.

Since D> d as described above, F1 <F
It is 2. It is well known that the larger the F value, the higher the resolution and the shallower the depth of focus, and the smaller the F value, the lower the resolution and the deeper the depth of focus. From this, it can be seen that the depth of focus of the optical image based on the afocal light flux passing through the diaphragm 12 is deeper than the depth of focus of the optical image based on the afocal light flux passing through the diaphragm 14. on the other hand,
The resolution of the optical image of the diaphragm 14 is higher than that of the optical image of the diaphragm 12. This is because the diaphragm 14 is located on the optical axis of the one imaging optical system 9 and the other imaging optical system 9
The same can be said when the diaphragm 12 is located on the optical axis of.

An image of an optical image obtained by the combination of the image-forming optical system 9 and the image pickup device 10 will be considered. As the disc member 11 rotates, a thick afocal light beam passing through the diaphragm 12 and a thin afocal light beam passing through the diaphragm 14 are alternately incident on the imaging optical system 9. The image of the optical image acquired by the image sensor 10 sequentially changes according to the change in the diameter of the afocal light beam. Disc member 1
The rotation speed of 1 is preferably 30 rps. This image changes in a cycle according to the rotation speed of the disk member 11. The rotation speed of the disk member 11 is more preferably larger than 30 rps. When the subject 7 moves with respect to the objective optical system 8,
The larger the number of rotations, the smaller the distance the subject 7 moves while the image of the optical image acquired by the image sensor 10 changes. That is, the time lag when the subject 7 moves is small.

The image pickup device 10 is connected to the control unit 21. The control unit 21 has image superimposing means (superimposed image generating means) for sequentially allocating the sequentially changing images for each diameter of the afocal light flux and superimposing the allocated images. The control unit 21 has an image A of an optical image based on the thick afocal light flux passing through the diaphragm 12 and an image B of an optical image based on the thin afocal light flux passing through the diaphragm 14.
And are sequentially input. The rotary encoder 18 is connected to the control unit 21. The control unit 21 acquires the diameter of the afocal light beam incident on the imaging optical system 9 based on the rotation angle of the disk member 11 passed from the rotary encoder 18. The image superimposing means uses the acquired information on the diameter of the afocal light flux to sort the image input to the control unit 21 into the image A and the image B for each diameter of the afocal light flux. The image superimposing means is divided into image A and image B.
Superimpose.

The control unit 21 is connected to a superimposition ratio setting means (superimposition ratio changing means) 25 for setting the superimposition ratio of the distributed images A and B. The set superimposition ratio is passed to the image superimposing means. In the present embodiment, the superimposition ratio setting means 25 uses a knob to which a variable resistor is attached. So far, the image of the optical image acquired by the combination of the one imaging optical system 9 and the image sensor 10 has been considered, but the image of the optical image acquired by the other combination of the imaging optical system 9 and the image sensor 10 has been considered. Is also the same. The image superimposed by the image superimposing means is displayed by the image display means.

The image display device is applied to various things.
In this embodiment, the image display device is applied to a microscope.
The image display means 60 of the present embodiment has a pair of monitors 22 connected to the control unit 21, a pair of image forming optical systems 23 and a pair of eyepiece optical systems 24. TFT for monitor 22
-LCD (Thin Film Transistor
Liquid Crystal Displays)
Is used. Images corresponding to the images of the optical images respectively acquired by the two image pickup devices 10 are displayed on the pair of monitors 22. The superimposition ratio set by the superimposition ratio setting means is reflected in the display densities of the images A and B sorted by the image superposition means. The image displayed on the monitor 22 is imaged at a predetermined position by the imaging optical system 23. The formed image is enlarged by the image forming optical system 23. The magnified image is viewed by the user 26. The image display means is, for example, a CR instead of the monitor 22, the imaging optical system 23 and the eyepiece optical system 24 when the image display device is applied to something different from the microscope.
It may have T. In this case, the image forming optical system 9 and the image pickup device 10 may be provided one by one.

When only the image A of the optical image based on the thick afocal light flux passing through the diaphragm 12 is displayed on the monitor 22, the user 26 observes the image of the subject 7 having a deep depth of focus. When only the image B of the optical image based on the thin afocal light flux that has passed through the diaphragm 14 is displayed on the monitor 22, an image having high resolution is observed.
When the superimposed image is displayed on the monitor 22, the user can obtain both the information of the image having the deep depth of focus and the information of the image having the high resolution.

In the conventional image pickup apparatus disclosed in the above-mentioned Japanese Patent Laid-Open No. 10-257373, in order to obtain an image having both a high resolution and a deep depth of focus, the conventional image pickup apparatus is optically constant with respect to the optical axis of the image pickup optical path. It is necessary to move the optical element while maintaining this posture. Therefore, a highly accurate drive mechanism and control are required. On the other hand, in the image display device of the present embodiment, the disc member 1 for the afocal light flux is
There is no need to increase the precision of the position of 1. Therefore, a highly accurate drive mechanism is not required, and the image display device has a simple structure.

In the present embodiment, the luminous flux diameter changing means 30 has the disk member 11, but the present invention is not limited to this. For example, liquid crystal shutters may be provided on the optical axes of the respective imaging optical systems 9.
In this case, the frequency of each liquid crystal shutter (the reciprocal of the cycle of the change in the diameter of the afocal light beam) is preferably 30H.
z, and more preferably greater than 30 Hz.

As described above, the image display device of this embodiment is applied to a microscope. An example in which this image display device is applied to a medical microscope, particularly a surgical microscope for magnifying and observing a surgical site will be described. FIG. 2 is a perspective view of a surgical microscope. The body 1 is made to oppose the operation part (subject) 7 of the patient 5 lying on the operating table 6. The mirror body 1 includes an objective optical system 8, a light flux diameter changing means 30, and an image acquiring means 50. The mirror body 1 is held by a holding mechanism fixed to the floor or ceiling (not shown) of the operating room. The viewer 3 incorporating the image display means 60 is an operator (user) 2
6 is placed in front of the eyes. The viewer 3 is held by a holding mechanism fixed to the floor or ceiling (not shown) of the operating room like the mirror body 1. A superimposition ratio setting means 25 is attached to the viewer 3.

By using this surgical microscope, the operator can obtain both the information on the image of the surgical site having a deep depth of focus and the information on the image having a high resolution. As a result, workability of surgery, particularly brain surgery, can be improved. For example, in the treatment of the dura mater seen in cranial base surgery in neurosurgery, the operator performs a magnified observation of the fine tissue at the bottom of the barhole provided in the patient's head and also compares it with the observation optical axis direction. A wide range of treatments can be performed.

Next, referring to FIGS. 3 to 5, the second embodiment of the present invention will be described.
The image display device of the embodiment will be described. FIG. 3 is a perspective view showing the configuration of the image display device. The image display device of the present embodiment is applied to a surgical microscope as in the first embodiment. FIG. 4 is a perspective view of a surgical microscope. The configuration of the image display device of this embodiment is basically the same as that of the first embodiment. In the present embodiment,
Components that are substantially the same as the components described with reference to FIGS. 1 and 2 of the first embodiment are the same as the reference numerals indicating the corresponding components of the first embodiment. Reference numerals are attached and detailed description is omitted. This embodiment is different from the first embodiment in the configuration of the disk member and the control unit.

The disk member 26 is a diaphragm 27 having a diameter E.
a, 27b, 27c, and diaphragms 28a, 28b having a diameter e.
28c. E> e. The center position of the diaphragm 27a and the center position of the diaphragm 28a are determined by the disk member 26.
It is point-symmetric with respect to the center of. The distance between the centers of the diaphragms 27a and 28a is L. The positional relationship between the diaphragm 27b and the diaphragm 28b and the positional relationship between the diaphragm 27c and the diaphragm 28c are as follows.
The positional relationship between 7a and the diaphragm 28a is the same. Aperture 27
The straight line connecting the centers of the a and 28a, the straight line connecting the centers of the diaphragms 27b and 28b, and the straight line connecting the centers of the diaphragms 27c and 28c divide the center angle of a circle centered on the center of the disk member 26 into six equal parts. ing.

When the disk member 26 is rotated, the diaphragms 27a, 27b, 2 are arranged with respect to the respective optical axes of the imaging optical system 9.
7c and diaphragms 28a, 28b, 28c move. When the diaphragm 27b is located on the optical axis of the one imaging optical system 9 and the diaphragm 28b is located on the optical axis of the other imaging optical system 9, the thick afocal light flux passing through the diaphragm 27b is directed to the one image sensor 10. The thin afocal light flux that has been guided and passed through the diaphragm 28b is guided to the other image sensor 10. Further disk member 2
6 rotates, and a diaphragm 28c is provided on the optical axis of one imaging optical system 9.
However, when the diaphragm 27c is located on the optical axis of the other imaging optical system 9, the thin afocal light flux that has passed through the diaphragm 28c is guided to one of the image pickup devices 10, and the thick afocal light flux that has passed through the diaphragm 27c is the other. Of the image sensor 10. When the disk member 26 is further rotated and the diaphragm 27a is positioned on the optical axis of the one imaging optical system 9 and the diaphragm 28a is positioned on the optical axis of the other imaging optical system 9, a thick afocal light beam is imaged on one side. The thin afocal light flux guided to the element 10 is guided to the other imaging element 10.

In the first embodiment, the disk member 11
The diameter of the afocal light beam is changed once during one rotation of. On the other hand, in the present embodiment, since the diameter of the afocal light beam is changed three times during one rotation of the disk member 26,
Compared with the first embodiment, the rotation speed of the disk member is 1/3.
Can be As a result, it is possible to suppress the sound and vibration generated by the rotation of the disc member.

In this way, a thick afocal light beam and a thin afocal light beam are alternately incident on the imaging optical system 9 in accordance with the rotation of the disk member 26. Image sensor 10
The image of the optical image acquired by changes sequentially according to the change of the diameter of the afocal light beam.

The image pickup device 10, the rotary encoder 18, and the monitor 22 are connected to the control unit 29, as in the first embodiment. The control unit 29 has an image generation unit that sequentially sorts the images that sequentially change as described above according to the diameter of the afocal light flux, and combines the sorted images to generate one image. The image generating means selects one image from the sorted images and takes out the central portion of this image. At the same time, the image generation means selects another image from the sorted images and extracts the peripheral portion of this image. At this time, the same image as when extracting the central portion may be selected. In this embodiment, the image selected when extracting the central portion is different from the image selected when extracting the peripheral portion. One image is generated by combining the central part and the peripheral part.

An image A of an optical image based on the thick afocal light flux and an image B of an optical image based on the thin afocal light flux are sequentially input to the control unit 29. Similar to the image superimposing means of the first embodiment, the image generating means sorts the image input to the control unit 29 into the image A and the image B for each diameter of the afocal light flux. As described above, the image A has a deep depth of focus. Image B has a high resolution. The control unit 29 selects the image B from the images A and B, and extracts the central portion of the image B. At the same time, the image generation means causes the images A and B to be
The image A is selected from, and the peripheral portion of the image A is taken out. The image generating means combines the central portion of the image B and the peripheral portion of the image A to generate one image. The central portion of the image B is arranged in the central portion of the generated image, and the peripheral portion of the image A is arranged in the peripheral portion of the generated image. To the control unit 29, a size setting unit (division ratio changing unit) 33 for setting the size of the central portion and the peripheral portion taken out by the image generating unit is connected. In the present embodiment, a knob having a variable resistor is used as the dimension setting means 33 (see FIG. 4). The image generated by the image generation means is displayed on the monitor 22 of the image display means 60.

As described above, the image display device of this embodiment is applied to a surgical microscope. An example of using this surgical microscope will be described. FIG. 5 shows a screen of the monitor 22 displaying the image generated by the image generating means. Figure 4
As shown in, the operator 26 positions the mirror body 1 with respect to the operation part while observing the screen built in the viewer 3. When the observation gazing site 34 indicated by an asterisk is located at the center of the screen, an image 32 near the observation gazing site 34 is displayed in the center of the screen. This image is the center of image B with high resolution. On the periphery of the image in the vicinity of the observation-and-gaze region 34, the image 3 of the region located on the periphery of the observation-and-gaze region 34
1 is displayed. This image is image A with a deep depth of focus
Is the peripheral portion of. By operating the size setting means 33, the size of the image 32 displayed in the central portion can be set to a desired size. As a result, workability of surgery, particularly brain surgery, can be improved. For example, it is effective for the treatment of dura found in skull base surgery in neurosurgery.

In the first embodiment, an image having a high resolution and an image having a deep depth of focus are superposed. On the other hand, in the present embodiment, these images can be displayed without deteriorating the contrast of the images A and B.

Next, an image display device according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing the configuration of the image display device. The image display device of the present embodiment is applied to a surgical microscope as in the first embodiment. The configuration of the image display device of this embodiment is basically the same as that of the second embodiment. In the present embodiment, substantially the same constituent members as the constituent members described with reference to FIGS. 3 to 5 of the second embodiment indicate the corresponding constituent members of the second embodiment. The same reference numerals as those used here are given, and detailed description thereof is omitted. This embodiment is different from the second embodiment in the configuration of the image generating means of the disc member and the control unit.

The disk member 35 includes diaphragms 36, 37, 3
It has 8, 39, 40, 41. When the diameters of these diaphragms are E1, E2, E3, E4, E5, and E6 in order, E1>E2>E3>E4>E5> E6. The centers of these diaphragms are located on the same circumference centered on the center of the disk member 35. PCD is L, and the line segment connecting the center of these diaphragms and the center of the disk member 35 divides the central angle of this circumference into 6 equal parts.

When the disk member 35 rotates, the diameter of the diaphragm located on the optical axis of the image forming optical system 9 is sequentially changed. At this time, the diameter of the afocal light flux guided to the image sensor 10 is sequentially changed. The image of the optical image acquired by the image sensor 10 sequentially changes according to such a change in the diameter of the afocal light flux.

The image pickup device 10, the rotary encoder 18, and the monitor 22 are connected to the control unit 42, as in the first embodiment. The control unit 42 includes images A, B, and B of optical images based on afocal light beams having different diameters.
C, D, E, F and G are sequentially input. The image generation means of the control unit 42 sorts these images according to the diameter of the afocal light flux. These images have different depths of focus and resolution.

The image generating means selects at least one image from the sorted images and takes out the central portion of this image. In this embodiment, two images are selected. For example, the images E and G are selected. At the same time, the image generation means selects at least one image from the sorted images and extracts the peripheral portion of this image. For example, the images A and C are selected. The image selected when extracting the central portion may be the same as or different from the image selected when extracting the peripheral portion.

The image generating means combines the central portion and the peripheral portion to generate one image. The central portion of the image E and the central portion of the image G are arranged in the central portion of the generated image. These are superposed. The peripheral portion of the image A and the peripheral portion of the image C are arranged in the peripheral portion of the generated image. These are also superimposed. The image generated by the image generation means is displayed on the monitor 22 of the image display means 60.

The control unit 42 is provided with a superimposition ratio setting means 43 for setting the superimposition ratio of the two images E and G arranged in the central part of the generated image, and arranged in the peripheral part of the generated image. The superimposition ratio setting means 44 for setting the superimposition ratio of the two images A and C is connected. Further, the control unit 42
A dimension setting means 45 for setting the dimensions of the central portion and the peripheral portion taken out by the image generating means is connected to the.
In the present embodiment, the superimposition ratio setting means 43, the superimposition ratio setting means 44, and the dimension setting means 45 use knobs to which variable resistors are attached.

The image display device of this embodiment has the effects of both the first and second embodiments. If a surgical microscope using the image display device of the present embodiment is used,
It is possible to acquire an image of the operative part that better matches the state of the operative part.

The present invention discloses the inventions shown in the following items.

1. An objective optical system that emits an afocal light beam based on the light beam from the subject and a part of this afocal light beam is passed, and the diameter is changed while keeping the central axis of the afocal light beam passing through constant. A light beam diameter changing means, an image acquiring means for acquiring an image of an optical image based on the afocal light beam passing through the light beam diameter changing means, and a change in the diameter of the afocal light beam acquired by the image acquiring means. Image that sequentially changes according to the diameter of the afocal light flux, and an image superimposing unit that superimposes the distributed images, a superimposing ratio setting unit that sets a superimposing ratio of the distributed images, and the image. An image display device comprising: an image display unit that displays the image superimposed by the superimposing unit.

2. The image display device according to item 1, wherein the superimposition ratio set by the superimposition ratio setting unit is reflected in the display density of each image distributed by the image superimposing unit.

3. An objective optical system that emits an afocal light beam based on the light beam from the subject and a part of this afocal light beam is passed, and the diameter is changed while keeping the central axis of the passing afocal light beam constant. A light beam diameter changing means, an image acquiring means for acquiring an image of an optical image based on the afocal light beam passing through the light beam diameter changing means, and a change in the diameter of the afocal light beam acquired by the image acquiring means. The images that are sequentially changed according to the diameter of the afocal light flux, at least one image is selected from the distributed images, the central portion of the image is extracted, and at least one image is selected from the distributed images. The peripheral portion of this image is taken out, the central portion and the peripheral portion are combined to generate one image, and the image generating means takes out the peripheral portion. The image display apparatus includes a size setting means for setting the dimensions of the central portion and the peripheral portion, and an image display means for displaying the generated image by the image generating means to be.

4. The image display device according to any one of items 1 to 3, wherein the light flux diameter changing unit has a plurality of diaphragms having different diameters.

5. The image display device according to any one of items 1 to 3, wherein the light flux diameter changing unit includes a disk member provided with a plurality of diaphragms having different diameters.

6. The image display device according to any one of items 1 to 3, wherein the light flux diameter changing unit has a liquid crystal shutter.

7. An objective optical system that emits an afocal light flux based on the light flux from the subject, and a light flux having an arbitrary diameter is selected from the afocal light flux and transmitted, and the size of the transmitted light flux is changed in the radial direction. Light beam diameter changing means, an image pickup means capable of picking up an optical image based on the afocal light beam transmitted through the light beam diameter changing means, and the image pickup means according to the operation of the light beam diameter changing means. Superimposed image generating means for generating an image in which a plurality of optical images having the same luminous flux center and different luminous flux diameters are superposed, and an image display which is connected to the superposed image generating means and can display an image in which a plurality of optical images are superposed An image display device comprising: a means and a superimposition ratio changing means for changing a superimposition ratio of the optical images superposed and displayed on the image display means.

8. The image display device according to item 7, wherein the superimposition ratio changed by the superimposition ratio changing unit is reflected in the display density of each optical image displayed in a superposed manner.

9. An objective optical system that emits an afocal light flux based on the light flux from the subject, and a light flux having an arbitrary diameter is selected from the afocal light flux and transmitted, and the size of the transmitted light flux is changed in the radial direction. Light beam diameter changing means, image pickup means capable of picking up an optical image based on the afocal light beam transmitted through the light beam diameter changing means, and the image pickup means obtained according to the operation of the light beam diameter changing means. An image generating unit that divides a plurality of optical images having the same light beam center and different light beam diameters in the radial direction, and selectively combines the plurality of divided optical images to generate one image, and the image generating unit. An image display device comprising: an image display unit that displays the generated image; and a division ratio changing unit that changes the radial division ratio in the image generating unit.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and applications are possible without departing from the spirit of the invention.

[0058]

As is clear from the above description,
By using the image display device according to the present invention, an observation image having a high resolution and a deep depth of focus can be easily obtained using a simple configuration.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an image display device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a surgical microscope using the image display device of FIG.

FIG. 3 is a perspective view showing a configuration of an image display device according to a second embodiment of the present invention.

4 is a perspective view of a surgical microscope using the image display device of FIG.

FIG. 5 is a diagram showing a screen of a monitor displaying an image generated by an image generating means.

FIG. 6 is a perspective view showing a configuration of an image display device according to a third embodiment of the present invention.

[Explanation of symbols]

1 Mirror 3 viewer 5 patients 6 operating table 7 Subject (Surgery) 8 Objective optical system 9 Imaging optical system 10 Image sensor 11 Disc member 12 aperture 13 pulley 14 Aperture 15 Timing belt 16 central axis 17 motor 18 Rotary encoder 19 Output rotation axis 20 pulley 21 control unit (image superimposing means) 22 monitors 23 Imaging optical system 24 Eyepiece optical system 25 Overlap ratio setting means 26 User (operator) 26 Disc member 27a, 27b, 27c diaphragm 28a, 28b, 28c diaphragm 29 control unit (image generation means) 30 Luminous flux diameter changing means 31 images 32 images 33 Dimension setting means 34 Observation-gaze area 35 Disc member 36,37,38,39,40,41 Aperture 42 control unit (image generation means) 43 Overlap ratio setting means 44 Overlap ratio setting means 45 Dimension setting means 50 Image acquisition means 60 image display means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/225 H04N 5/225 D 5/232 5/232 A (72) Inventor Toru Shinmura Shibuya-ku, Tokyo 2-43-2 Hatagaya, Olympus Optical Co., Ltd. (72) Inventor Tomoaki Yamashita 2-43-2, Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Genichi Nakamura Tokyo 2-43-2 Hatagaya, Shibuya Olympus Optical Industry Co., Ltd. (72) Inventor Junichi Nozawa 2-43-2 Hatagaya, Shibuya-ku Tokyo Olympus Optical Industry Co., Ltd. (72) Inventor Masakazu Mizoguchi Tokyo 2-43-2 Hatagaya, Shibuya Olympus Optical Industry Co., Ltd. (72) Inventor Kenji Omachi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Gaku Kogyo Co., Ltd. (72) Inventor Asahi Ishikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (72) Koji Yasunaga 2-43-2 Hatagaya, Shibuya-ku, Tokyo Ori (72) Inventor, Keiji Shioda 2-43-2 Hatagaya, Shibuya-ku, Tokyo F-Term (reference) 2H052 AA13 AB19 AD35 AF14 AF21 2H080 AA19 5C022 AA08 AB21 AC51 within Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. An objective optical system that emits an afocal light beam based on a light beam from a subject, and a part of this afocal light beam is allowed to pass through while keeping the central axis of the passing afocal light beam constant. A beam diameter changing means for changing the diameter thereof, an image acquiring means for acquiring an image of an optical image based on the afocal light beam passing through the light beam diameter changing means, and an afocal light beam acquired by the image acquiring means. An image superimposing means for sequentially allocating images that sequentially change according to the diameter change according to the diameter of the afocal light flux, and superimposing these distributed images, and a superimposition ratio setting that sets the superimposition ratio of these distributed images. An image display device comprising: a means; and an image display means for displaying the image superimposed by the image superimposing means. 2. The image display device according to claim 1, wherein the superimposition ratio set by the superimposition ratio setting unit is reflected in the display density of each image distributed by the image superimposing unit. 3. An objective optical system that emits an afocal light beam based on a light beam from a subject, and a part of this afocal light beam is allowed to pass through while keeping the central axis of the passing afocal light beam constant. A beam diameter changing means for changing the diameter thereof, an image acquiring means for acquiring an image of an optical image based on the afocal light beam passing through the light beam diameter changing means, and an afocal light beam acquired by the image acquiring means. The images that sequentially change according to the diameter change are sequentially distributed for each diameter of the afocal light flux, at least one image is selected from the distributed images, and the central portion of this image is taken out.
At least one image is selected from the distributed images, the peripheral portion of this image is taken out, and the central portion and the peripheral portion are combined to generate one image, and the central portion taken out by the image generating means. An image display device comprising: a size setting unit that sets the size of a portion and a peripheral portion; and an image display unit that displays an image generated by the image generating unit.