JP2001311910A - Magnifier optical system and stereoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnifier optical system and a stereoscope which are suitable for obtaining an appreciating means for a stereoscopic image fully covering the visual field of a human with the easiness of the stereoscope although the appreciating means could not be actualized before even by a large- scale device for all-around celestial stereoscopic video, etc. SOLUTION: This stereoscope 9 is made by inclining the optical axes 6 and 6 of two magnifier optical systems 5 and 5 each of which generates pincushion distortion and arranging so that the side of stereoscopic images 7 and 7 as a picture to be observed spreads in the horizontal direction more than the side of an eye point (e). The magnifier optical systems 5 and 5 each have three- group constitution of a 1st lens group 1 of a positive meniscus spherical lens which has a concave surface on the side of the eye point (e), a 2nd lens group 2 of a magnifying lens which is positive on the whole, and a 3rd lens group 3 of a negative meniscus spherical lens which has concave surface on the side of the stereoscopic images 7 and 7 in order from the side of the eye point (e).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnifying mirror optical system and a stereoscopic mirror for a stereoscopic mirror capable of obtaining a wide field of view comparable to the entire visual field of both human eyes.

[0002]

2. Description of the Related Art Conventionally, a stereoscopic mirror has been used as a tool for easily enjoying a stereoscopic image. The most common mechanism is
A pair of magnifying mirrors are arranged with their optical axes, that is, the central axis of the lens system almost parallel, at an interval of about 65 mm, which is the interval between the human eyes, and a stereo corresponding to the position of their focal point on the left and right. It is provided with a holder for arranging a picture or an image drawn by stereoscopic projection. And
In most cases, the image to be viewed is photographed or drawn with the same perspective as the standard lens of a general camera. For this reason, the lens system of the magnifying glass is designed to minimize pincushion distortion and the like.

That is, since a magnifying glass is created for the purpose of obtaining an optical virtual image obtained by enlarging a drawing to be observed, the virtual image should be made as similar to the original figure as possible without distorting the original drawing together with the magnification. Designed. For this reason, pincushion distortion due to the spherical lens is a characteristic to be eliminated. As a means for solving this pincushion distortion, an aspherical lens or the like is used.

[0004]

However, the conventional magnifying glass is limited mainly by the design limit of the aspherical lens and the aperture of the eyepiece, and the field of view is limited. . For this reason, few attempts have been made to design a magnifier having a wide field of view comparable to that of the human eye.

[0005] As means for obtaining an image with a wide field of view, there are known an all-around sky image apparatus using a vaulted ceiling, such as a planetarium, and an apparatus using a cylindrically curved wide screen. However, these devices are designed for human beings to enter and appreciate large-scale devices, and are not easily used by individuals, and are inferior in terms of simplicity.

In order to solve such problems, the present inventor has developed a stereoscopic mirror as a means for appreciating a stereoscopic image covering a human visual field in the past (Japanese Patent Laid-Open No. Hei 10 (1998)).
-26738). Although this stereoscopic mirror is sufficient as a basic function, there are still points to be improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and covers a human visual field, which could not be realized by a large-scale apparatus such as an omnidirectional stereoscopic image. An object of the present invention is to provide a magnifying mirror optical system and a stereoscopic mirror suitable for obtaining a stereoscopic image appreciating means with the ease of a stereoscopic mirror. Another object of the present invention is to provide a basic stereoscopic mirror disclosed in a past application that is further improved and is more practical.

[0008]

In order to achieve the above object, a first lens group which is a meniscus-shaped positive spherical lens having a concave surface facing the eye point side is sequentially provided from the eye point side of the present invention; The second is a positive magnifying lens as a whole
And a third lens group that is a meniscus negative spherical lens with the concave surface facing the drawing to be viewed.
In the group configuration, the first lens group has a refractive index at d-line of 1.65 or more and 1.90 or less and a dispersion ratio of 55.0 Abbe number.
The material having a dispersion ratio of not less than 90.0 or less, the material having a dispersion ratio of 55.0 or more and 90.0 or less for the second lens group, and the dispersion ratio of 21.0 or more and 32 for the third lens group. 0.0 or less.

By adopting such a lens configuration, a means for viewing a stereoscopic image that covers a human field of view, which cannot be realized by a large-scale apparatus such as a panoramic three-dimensional image, can be easily realized by a stereoscopic mirror. Thus, a suitable magnifying glass optical system can be easily obtained.

According to another aspect of the present invention, in addition to the magnifying glass optical system of the above-described aspect, the first lens group is an eyepiece, the pupil distance is 10 to 20 mm, and the aperture is 48 mm or more.
The eye point side is made concave so as to cover the field of view, and the curvature of the lens surface opposite to the eye point is increased to the limit that does not cause total reflection even at the end, so that power is gained.

Therefore, it is possible to reduce the size of the magnifying glass optical system for obtaining a stereoscopic image that covers the human visual field, and it is possible to reliably obtain an easy-to-view stereoscopic image.

Further, according to another aspect of the present invention, in addition to the above-mentioned inventions, the aperture of the second lens group has a size large enough to capture a light beam connecting the end of the exit pupil and the end of the first lens group. I'm trying.

For this reason, it is possible to employ a wide-angle lens in which a light source around the lens system is reliably captured by the lens system and pincushion distortion easily occurs.

According to another aspect of the present invention, in addition to the magnifying glass optical system of the above-described aspect, the aperture of the third lens group is used to capture a light beam connecting the end of the first lens group and the second lens group. And large enough.

Therefore, a light source around the lens system is reliably captured by the lens system, and a lens having a wide field of view such as a fish-eye lens can be sufficiently used even when used in the first lens group. Can be.

Further, in another invention, in addition to the above-mentioned inventions, the pincushion distortion caused by each lens group is not corrected, and the barrel distortion due to the equidistant projection method or the like occurring in the drawing to be observed is not corrected. Offset.

As a result, pincushion distortion can be generated in the magnifying glass optical system, which facilitates the design of the spherical lens and reduces the cost of the lens system.

Further, in the stereoscopic mirror of the present invention, the optical axes of the two magnifying mirror optical systems, each of which causes pincushion distortion, are arranged so that the drawing side to be observed is wider in the horizontal direction than the eye point side. In the stereoscopic mirror, each magnifying mirror optical system is sequentially arranged from the eye point side with a first lens group that is a meniscus-shaped positive spherical lens having a concave surface facing the eye point side, and a first lens group that is a positive magnifying lens as a whole. It has a three-group configuration including two lens groups, a meniscus-shaped negative spherical lens having a concave surface facing the drawing to be viewed, and a third lens group.

By adopting this configuration, a means for appreciating a stereoscopic image that covers a human field of view, which cannot be realized by a large-scale apparatus such as a panoramic stereoscopic image, can be obtained with the ease of a stereoscopic mirror. In this case, a suitable magnifier optical system can be easily obtained.

Further, another invention provides the above-mentioned stereoscopic mirror,
The first lens group has a refractive index for the d-line of 1.65 or more and 1.90 or less and a dispersion ratio of 55.0 or more and 90.0 or more for the first lens group.
The following materials are used, and the dispersion ratio of the second lens group is 5
The third lens group is made of a material having an Abbe number of 21.0 or more and 32.0 or less.

Therefore, it is possible to reduce the size of a stereoscopic mirror for obtaining a stereoscopic image that covers the human visual field, and to surely obtain a stereoscopic image that is easy to view.

According to another aspect of the present invention, there is provided a stereoscopic mirror in which two magnifying mirror optical systems according to any one of claims 1 to 5 are arranged side by side in a horizontal direction, and each optical axis is positioned on the side of the drawing to be observed. The optical axis is inclined so as to expand in the horizontal direction as compared with the eye point side, and the crossing angle of the optical axis is set to 20 degrees or more and 50 degrees or less.

As a result, it is possible to easily obtain a stereoscopic mirror as a means for appreciating a stereoscopic image that covers a human field of view, which could not be realized by a large-scale device such as an all-around three-dimensional image. In addition, a sufficient space for disposing the magnifying mirror optical system in the stereoscopic mirror can be obtained, and the stereoscopic mirror can be adapted to both eyes of a human, so that a stereoscopic image with a natural feeling can be obtained.

Further, in a three-dimensional mirror according to another aspect of the present invention, two magnifying mirror optical systems according to any one of claims 1 to 5 are arranged side by side in a horizontal direction, and each optical axis is positioned on the drawing side of the drawing to be observed. It is tilted so as to spread in the horizontal direction as compared with the eye point side, and its total field of view is set to 180 degrees or more and 220 degrees or less.

For this reason, it is possible to easily obtain a stereoscopic mirror as a means for appreciating a stereoscopic image that covers a human field of view, which could not be realized by a large-scale apparatus such as a three-dimensional omnidirectional stereoscopic image.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, only the main parts of the magnifying glass optical system and the stereoscopic mirror according to the present invention are shown.
Parts not directly related to the present invention will be omitted, and will be omitted in the following description.

FIG. 1 is a sectional view of an embodiment of a magnifying optical system according to the present invention. The magnifying mirror optical system 5 includes, in order from the eye point e side, a first lens group 1 serving as a meniscus-shaped positive spherical lens having a concave surface facing the eye point e side;
A second lens group 2 which is a positive magnifying lens as a whole,
It has a three-group configuration including a third lens group 3 which is a meniscus-shaped negative spherical lens having a concave surface facing the drawing 4 to be observed. In this embodiment, the first lens group 1 is composed of one lens, the second lens group 2 is composed of two double-sided convex spherical lenses 2a and 2b, and the third lens group 3 Has a one-piece configuration. In addition, eye point e
Denotes the position of the exit pupil, that is, the position of the pupil of the observer.

The first lens group 1 has a refractive index at d-line of 1.65 or more and 1.90 or less and a dispersion coefficient of Abbe number 5
A material of 5.0 or more and 90.0 or less is used. Thereby, it is possible to cope with an image having a wide angle of view. Second
Has a dispersion ratio of 55.0 or more and 9
The third lens group 3 is made of a material having an Abbe number of 21.0 or more and 32.0 or less. These can reduce chromatic aberration. Here, the d-line is a representative of spectral lines of light for measuring the refractive index, and is a yellow light ray having a wavelength of 587.5618 nm.

The first lens group 1 has a pupil distance M
The diameter is set to 48 mm or more while maintaining approximately 15 mm,
The eye point e side is made concave so as to cover the field of view, and the curvature of the lens surface on the opposite side to the eye point e is increased to the limit that does not cause total reflection even at the end, so as to gain power. If the pupil distance M is 10 to 20 mm, it is possible to achieve a function substantially equivalent to that of the embodiment of 15 mm.

The second lens unit 2 has a sufficient diameter to capture a light beam connecting the end of the exit pupil to the end of the first lens unit 1. The third lens group 3 has a diameter sufficient to capture a light beam connecting the end of the first lens group 1 and the second lens group 2.

In order to obtain a wide field of view, the pincushion distortion generated by the magnifying glass optical system 5 is not corrected, but an appropriate barrel distortion generated in the drawing 4 to be observed by the equidistant projection method or the like is canceled. Like that. With the above structure, the exit pupil becomes large.

The specific shape and material of the first lens group 1 of this embodiment are as follows. That is,
The radius of curvature on the eye point e side is 64.29 mm, the radius of curvature on the observation object drawing 4 side is 35.22 mm, and the aperture is 6
It is 8.64 mm and the center thickness is 17.38 mm. The material is LaK14 (lantern / crown) made of glass, the d-line refractive index is 1.6968, and the Abbe number is 55.53.

The specific shape and material of the second lens unit 2 of this embodiment will be described below. First, the shape and material of the lens 2a closer to the first lens group 1 serving as the eyepiece are as follows. That is, the radius of curvature on the eye point e side is 323.80 mm, the radius of curvature on the observation object drawing 4 side is 153.57 mm, and the aperture is 126.90 mm.
It has become. Also, the center thickness is 20.00mm,
The material is PMMA (polymethyl methacrylate) of acrylic, d-line refractive index is 1.4900, Abbe number is 5
It is 8.00.

The shape and material of the lens 2b in the second lens group 2 near the third lens group 3 are as follows. That is, the radius of curvature on the eye point e side is 45
3.53 mm, the radius of curvature on the side of the drawing 4 to be observed is 17
The diameter is 3.18 mm, the diameter is 139.28 mm, and the center thickness is 20.00 mm. The material, d-line refractive index and Abbe number are the same as those of the lens 2a.

Next, the third lens group 3 of this embodiment
The specific shape and material of are shown below. That is, the radius of curvature on the eye point e side is 460.65 mm, the radius of curvature on the observation object drawing 4 side is 109.13 mm, and the aperture is 140.00 mm. Also, the center part thickness is 2.00 mm, the material is acrylic PS (polystyrene), the d-line refractive index is 1.5900, and the Abbe number is 3
1.00.

FIG. 2 is a plan sectional view showing a lens system structure of a three-dimensional mirror 9 using two magnifying mirror optical systems 5 of FIG. 1 for both left and right eyes. As shown in FIG. 2, the optical axes 6, 6 of the magnifying mirror optical systems 5, 5, that is, the central axes of the lens systems,
It is opened to the left and right in the horizontal direction on the side of the drawing 4 to be observed, which is the objective lens side, and is arranged at an angle of 20 degrees with respect to the center line L. The left and right optical axes 6 and 6 intersect on an extension line on the eye point e side. This crossing angle α is, in this embodiment,
It will be 40 degrees.

The interval between the eye points e and e is set to be about 65 mm, which is the average human pupil distance. At this time, since a part (adjacent part) of the magnifying optical systems 5 and 5 physically interfere with each other, a part of each magnifying optical system 5 and 5 is deleted up to the boundary surface, and FIG. As shown in FIG. In this embodiment, the first lens group 1 is divided into two,
The lenses of the second lens group 2 and the third lens group 3 are integrally formed with adjacent ones.

In the case of the two stereo images 7, 7 serving as a drawing to be viewed, the left and right images are conventionally placed on the same plane, but the inclination of the optical axes 6, 6 of the magnifying optical systems 5, 5 has been conventionally. And are arranged at an angle to each other so as to be perpendicular to the respective optical axes 6 and 6. The set of two stereo images 7, 7 is held by a holder 8. In the example shown in FIG. 2, stereo images 7, 7 having a part of a side surface of a cylinder or a part of a sphere centered on the optical axes 6, 6 of the magnifying mirror optical systems 5, 5 are arranged. . Note that the stereo images 7, 7 are flat, and they are formed at an obtuse angle (180 degrees-
α) may be arranged in a chevron.

The crossing angle α is preferably in the range of 20 to 50 degrees, and the total field of view by the magnifying glass optical systems 5, 5 is preferably in the range of 180 to 220 degrees. That is, in the above-described embodiment, the optical axes 6 and 6 of the magnifying glass optical systems 5 and 5 are opened to the left and right in the horizontal direction on the side of the drawing 4 to be observed, and are inclined by 20 degrees with respect to the center line L. By doing so, the left and right optical axes 6 and 6 are made to cross at an angle of 40 degrees on the extension of the eye point e side, but the crossing angle α may be another value. Crossover angle α is 2
When the angle is set to 0 degree or more, the space for disposing the magnifying mirror optical systems 5 and 5 can be widened, and the entire field of view can be easily widened.
When the crossing angle α is set to 50 degrees or less, the crossing angle α becomes substantially the same as the line of sight of a human, and a natural image is easily obtained.

The distance between the eye points e and e is set to about 65.
mm (6.5 cm), and the interval is 5 to 8 mm.
It may be in the range of cm. Further, the space may be made variable by configuring the stereoscopic mirror so that the cross angle α can be changed. In addition, it is preferable that this interval be 5 cm or more, since it can cover children and adults. Further, the arrangement space for the magnifying mirror optical systems 5 and 5 can be increased, and a large-sized lens having a wide angle of view can be easily adopted. On the other hand, if this interval is within 8 cm,
It is compatible with both human eyes, and it is possible to enjoy images with a natural feeling.

The stereoscopic images 7 and 7 observed by the stereoscopic mirror 9 using the magnifying mirror optical systems 5 and 5 are photographed by the equidistant projection method, the equisolid angle projection method, or a projection method similar thereto, which is represented by the following equation. Alternatively, it is preferable to use a drawn image. d = f · θ (equidistant projection) d = n · f · sin (θ / n) (equisolid angle projection) d = n · f · sin (θ / m) (conform to the equisolid angle projection Where θ is the inclination of a ray connecting the subject and the entrance pupil of the wide-angle lens 1 with respect to the optical axis 3 of the lens system, and d is
F is a proportional constant (which is also the focal length of the lens system) on the image plane from the center of the image plane to the real image of the subject. n and m are real numbers different from each other. In particular, when both are 1.0, an orthographic projection is used, and when both are infinity, an equidistant projection is used.

When the stereo images 7, 7 are photographed, the angle of the two stereo images 7, 7 at the photographing place of the two photographed images is increased in the horizontal direction from the photographing place toward the photographed object. And shoot. At this time, the crossing angle when the front side in the photographing direction is extended as it is is set to 20 degrees or more and 50 degrees or less. In addition, when drawing, the line of sight at the time of drawing is set to an angle that spreads in the horizontal direction toward the outside, and each of the two stereo images 7, 7 is drawn. Then, for the same reason as that of the photographed image, it is preferable that the crossing angle when the front side in the line of sight direction is extended as it is is not less than 20 degrees and not more than 50 degrees. In addition, each angle of view,
It is preferable to set each to 130 to 170 degrees.

FIG. 3 shows the external appearance of the body of the stereoscopic mirror 9 having the lens system configuration shown in FIG. As shown in FIG. 3, the first lens groups 1, 1 serving as eyepieces are installed on the back of the stereoscopic mirror 9, that is, on the human eye side. A holder 8 is arranged on the front surface of the stereoscopic mirror 9.

Generally, the visual field of one eye of a human is about 150 degrees because the frontal direction is blocked by the ridge of the nose. The center of the field of view is directed outward at an angle of about 20 degrees with respect to the front. Correspondingly,
By tilting the optical axes of left and right photographing lenses (wide-angle lenses) of a stereo camera serving as a stereo image photographing device outwardly by 10 degrees or more and 25 degrees or less, a diagonal fisheye or the like is most widely used. Even if a super-wide-angle lens that can obtain a field of view of 180 degrees or less with a single eye is used, a stereoscopic image of a field of view of 180 degrees or more can be easily obtained with both eyes.

As described above, by viewing an image having an angle of view of about 130 to 170 degrees with the stereoscopic mirror 9 of the present invention, a stereoscopic image having a viewing angle of 180 degrees or more with both eyes can be easily reproduced. Can be done. That is, the optical axes 6 and 6 of the two right and left magnifying mirror optical systems 5 and 5 are arranged at the same angle as the optical axes of the left and right photographing lenses of the stereo camera as the photographing device and in a direction inclined outward with respect to the front. The barrel distortion caused by the fisheye or the like of the photographing lens is visually offset by the pincushion distortion generated by the magnifying glass optical system 5, and the eyepiece (first lens) is used.
If the stereoscopic mirror 9 having a large viewing angle and a wide viewing angle of 150 ° or more is used, the visual field of 180 ° or more can be easily reproduced with both eyes.

As described above, the magnifying mirror optical system 5 and the three-dimensional mirror 9 according to each embodiment of the present invention correspond directly to the mechanism of the human visual field, and reproduce the human visual field in a form close to nature. As a result, the user can enjoy the feeling of having entered the stereoscopic images obtained by the stereoscopic images 7 and 7.

It is to be noted that, instead of a film image, a two-piece stereo image 7, 7 obtained by the image pickup device is provided on the front of the magnifying mirror optical systems 5, 5 of the stereoscopic mirror 9 in the form of an image like a television display. This makes it possible to use images captured by a stereo camera and these systems for monitoring or remote control robots. The stereoscopic mirror 9 obtained in this embodiment has a smaller blind spot and makes it easier to judge the situation of the site as compared with the conventional one.

If a small television monitor such as a liquid crystal display is arranged in place of the stereo images 7, 7, it is possible to cope with moving images. Also, remove the folder 8 or make it transparent so that the stereo images 7, 7
It is also possible to deal with a moving image by arranging a mat screen in place of this and projecting an image on a CRT or a liquid crystal display using a projection lens.

In the magnifying mirror optical system 5 according to this embodiment, as described above, the pincushion distortion caused by the characteristics of the spherical lens is not corrected, and a suitable barrel shape by the equidistant projection method or the like is provided on the object 4 to be observed. We deal with it by offsetting with distortion. Further, as a method of adapting to the three-dimensional mirror 9, when the two magnifying mirror optical systems 5 are used for both left stones, the optical axis 6 of the magnifying mirror optical system 5, which is conventionally arranged in parallel, In other words, the center axis of the lens system is arranged so that the objective lens side is opened to the left and right in the horizontal direction outward, and is inclined by 10 degrees or more and 25 degrees or less. As a result, the left and right optical axes 6 and 6 intersect at an angle of 20 degrees or more and 50 degrees or less on the extension line on the eye point e side.

When two magnifying glass optical systems 5 are used for the left and right eyes as described above, if some of the lenses physically interfere with each other, the right eye and the right eye may be moved in front of the face. The viewing angle of the magnifying glass optical system 5 is approximately 45 degrees to the left, and the viewing angle of the magnifying glass optical system 5 for the left eye is also approximately 45 degrees to the right.
The magnifying mirror optical system 5 is molded into a plane-symmetrical shape in which a part of each magnifying mirror optical system 5 is deleted up to the boundary surface. As described above, the magnifying mirror optical system 5 and the three-dimensional mirror 9 having the function for obtaining the means for appreciating the three-dimensional image covering the human visual field with the ease of the three-dimensional mirror.
Can be obtained.

When the pincushion distortion is allowed, the design of the magnifying optical system 5 having a large aperture and a wide viewing angle becomes easy, compared to the case where pincushion distortion is not allowed. Specifically, it is possible to easily design a viewing angle of about 160 degrees. This corresponds to the static field of view of one human eye. When the two magnifying glass optical systems 5 are applied to the left and right eyes and adjusted so as to obtain a natural field of view and fixed as they are, the optical axes 6, 6 of the magnifying glass optical systems 5, 5 are positioned in front. It faces a direction inclined outward by about 20 degrees at a time, and a viewing angle of about 200 degrees is obtained in the entire field of view.

As described above, the magnifying mirror optical system 5 and the stereoscopic mirror 9 directly correspond to the mechanism of the human visual field, and reproduce the human visual field in a nearly natural form. You can enjoy the feeling of getting inside 7,7.

As a visual output device of virtual reality, a head-mounted system has been generally used.
For this purpose, a head position / direction detecting device commonly called Hopimus is required, and the corresponding image generation also requires a large load on the computer. The stereoscopic mirror 9 according to the present invention comprises
Since the field of view is wide, a sufficient sense of presence and immersion can be obtained, and even when used in a stationary manner, the sense of presence and immersion of the head-mounted system can be surpassed depending on the purpose. Therefore, if the stereoscopic mirror 9 according to the present invention is used in a stationary manner, an expensive position and direction detecting device is not required, and the reduced load can be directed to a computer to create a higher definition image.

An advantage of the stationary method is that switching between virtual and real can be performed instantaneously. If the stereoscopic mirror 9 has a sufficient sense of realism and immersion, there are many fields that can be replaced with a head mounted system, the cost can be kept low, it is suitable for practical work such as CAD, and the spread of virtual reality That can contribute to

The above embodiments are examples of preferred embodiments of the present invention. However, the present invention is not limited to these embodiments, and various modifications may be made within the scope of the present invention. Is possible. For example, in each embodiment, the angle of view of each of the stereo images 7, 7 reproduced by the magnifying glass optical systems 5, 5 is set to 150 degrees, and the lens system can reproduce the angle of view. Images 7, 7
If the angle of view is set to 130 degrees or more, a natural feeling can be obtained by approximating a human visual field. Further, when the angle of view of the stereo images 7, 7 is set to 170 degrees or less, it is not necessary to increase the performance of the lens system so much, and cost can be reduced.

Each of the stereo images 7, 7 may be a moving image instead of a still image. Also, each stereo image 7,
Reference numeral 7 may be an analog or digital electronic image or an animation image in addition to a film image. Further, it is preferable that the two stereo images 7, 7 taken at the same time are shot at the same time. However, it is not always necessary that the two stereo images 7, 7 are shot at the same time if they are the same as those shot at the same time by synchronization or the like. Absent.

[0057]

According to the magnifying optical system and the three-dimensional mirror of the present invention, there is provided means for viewing a three-dimensional image covering a human visual field, which could not be realized by a large-scale apparatus such as an all-around three-dimensional image. In addition, it is possible to easily obtain a magnifying mirror optical system and a stereoscopic mirror suitable for obtaining a stereoscopic mirror with ease.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnifying optical system according to an embodiment of the present invention.

FIG. 2 is a plan sectional view when the magnifying mirror optical system of FIG. 1 is applied as a magnifying mirror of a stereoscopic mirror.

FIG. 3 is a perspective view showing an appearance of the stereoscopic mirror of FIG.

[Explanation of Signs] 1 First lens group (positive spherical lens, eyepiece lens) 2 Second lens group (positive magnifying lens) 3 Third lens group (negative spherical lens) 4 Observation target drawing 5 Magnification Mirror optical system 6 Optical axis of magnifying mirror optical system 7 Stereo image (drawing to be observed) 8 Holder 9 Stereoscopic mirror e Position of exit pupil (that is, pupil of observer)

Claims (9)

[Claims] 1. A first lens group serving as a meniscus-shaped positive spherical lens having a concave surface facing the eye point side, and a second lens group serving as a positive magnifying lens as a whole, in order from the eye point side. The first lens group has a refractive index for d-line of 1.65 or more and 1.65. Abbe number 5 when the dispersion rate is 90 or less
A material having a dispersion ratio of 5.0 or more and 90.0 or less, a material having a dispersion ratio of 55.0 or more and 90.0 or less for the second lens group, and a dispersion ratio of an Abbe number for the third lens group. 21.0
A magnifying mirror optical system characterized by using a material of not less than 32.0 or less. 2. The method according to claim 1, wherein the first lens group is an eyepiece.
The pupil distance is 10 to 20 mm, the aperture is 48 mm or more, the eye point side is concave so as to cover the field of view, and the curvature of the lens surface on the opposite side to the eye point does not cause total reflection even at the end. 2. The magnifying mirror optical system according to claim 1, wherein the power is increased by increasing the power of the magnifying mirror. 3. The apparatus according to claim 1, wherein the aperture of the second lens group is large enough to capture a light beam connecting the end of the exit pupil and the end of the first lens group. Or the magnifying glass optical system according to 2. 4. The lens system according to claim 1, wherein an aperture of the third lens group is set to the first lens group.
4. The magnifying glass optical system according to claim 1, wherein the size of the magnifying glass optical system is large enough to capture a light beam connecting an end of the second lens unit and the second lens unit. 5. The method according to claim 1, wherein the pincushion distortion caused by each of the lens groups is not corrected, but the barrel distortion caused by the equidistant projection method or the like occurring in the drawing to be observed is offset. 5. The magnifying glass optical system according to 2, 3 or 4. 6. A three-dimensional mirror in which the optical axes of two magnifying mirror optical systems, each of which produces pincushion distortion, are inclined so that the drawing side to be observed is wider in the horizontal direction than the eye point side. The mirror optical system includes, in order from the eye point side, a first lens group serving as a meniscus-shaped positive spherical lens having a concave surface facing the eye point side, and a second lens group serving as a positive magnifying lens as a whole. A stereoscopic mirror having a three-group configuration including a third lens group that is a meniscus-shaped negative spherical lens having a concave surface facing the drawing image to be observed. 7. The first lens group has a refractive index with respect to d-line of 1.65 or more and 1.90 or less and a dispersion ratio of 5 or more with an Abbe number of 5.degree.
A material having a dispersion ratio of 5.0 or more and 90.0 or less, a material having a dispersion ratio of 55.0 or more and 90.0 or less for the second lens group, and a dispersion ratio of an Abbe number for the third lens group. 21.0
7. The three-dimensional mirror according to claim 6, wherein a material of not less than 32.0 is used. 8. A magnifying mirror optical system according to claim 1, wherein two magnifying optical systems are arranged side by side in a horizontal direction, and the respective optical axes of the magnifying glass optical systems are arranged in a horizontal direction as compared with the eye point side with respect to the drawing object to be observed. A three-dimensional mirror characterized by being inclined so as to spread, and having an optical axis crossing angle of 20 degrees or more and 50 degrees or less. 9. A magnifying glass optical system according to claim 1, wherein two magnifying mirror optical systems are arranged side by side in the horizontal direction, and the respective optical axes are arranged such that the object drawing side of the magnifying glass is horizontal in comparison with the eye point side. Tilt so that it spreads, and the entire field of view is 180
A three-dimensional mirror, wherein the angle is not less than 220 degrees and not more than 220 degrees.