JP2006280807A - Visual field expansion appliance and visual field expansion glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for expanding the visual field of a person with narrowed visual field by a simple and effective device. <P>SOLUTION: This visual field expansion appliance 40 is provided with a convex mirror 20 having a through-hole 20a at its central part, a plane mirror 10, or an imaging mirror, reflecting reflected light from the convex mirror 20 and disposed opposite to the convex mirror 20, and a support body (a hollow body 30). The support body is attached with a sliding body 61 correcting the optical axis of the plane mirror 10 to the convex mirror 20 and a plane mirror rotating mechanism 50. The glasses 1 are provided with the visual field expansion appliances 40 for the both eyes as glass lenses. This visual field expansion appliance allows even the person with the narrowed visual field having only the central visual field to see an image with expanded visual field by viewing the imaging mirror through the through-hole provided in the convex mirror. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a field-of-view magnifier and field-magnification glasses. More specifically, the present invention relates to a field-expansion tool and field-expansion glasses used to expand the field of view of a person with narrowed field of view.

As a tool for enlarging the human visual field, there is a tool using a surface correction lens (see Patent Document 1). Further, a visual enhancement device for expanding the visual field of a person with narrowed visual field is known (see Patent Document 2).
JP-T-2001-510905 JP 2003-287708 A

However, the surface correction lens of Patent Document 1 enlarges the periphery of the visual field of a healthy person, and does not contribute to enlarging the visual field to a person with narrowed visual field. Here, the “field of view” refers to a range that can be seen when staring at one point in front of the eyes. The visual field of one eye of a healthy person is about 70 ° above and about 80 ° below and about 60 ° outside and about 90 ° outside. Further, “field narrowing” means a state in which a visual field is obstructed, and means that the field of view is narrowed.
Visual field stenosis is often caused by diseases such as cerebral infarction and glaucoma, and is particularly common in elderly people. It is difficult for people with narrow vision, especially elderly people, to handle complex structures. Furthermore, if there is a physical disorder due to cerebral infarction or the like. The population of people with visual field stenosis tends to increase toward an aging society, and there is a demand for means for eliminating visual field stenosis by a simple and effective method.
Here, the field-of-view expansion device of Patent Document 2 is for enlarging the field of view of a person with a field-of-view narrowing, but expands the field of view by an electronic method, and includes an imaging unit, an image processing unit, and a display unit. It is necessary to be. Therefore, it is heavy equipment and the structure is complicated. Furthermore, since the battery is used as a drive source, it is necessary to periodically replace or charge the battery. It is not easy for a person with narrow vision to perform such maintenance regularly.
The present invention solves the above-described problems, and an object thereof is to provide a tool for enlarging the visual field of a person with narrowed visual field by a simple and effective device.

The present invention is as follows.
1. A convex mirror provided with a through-hole in the central portion; an imaging mirror that reflects light reflected from the convex mirror; and an imaging mirror that is disposed opposite to the convex mirror; and a support that connects the convex mirror to the imaging mirror. A field of view enlarging tool characterized by that.
2. The imaging mirror is a plane mirror. The field of view enlarging tool described.
3. By operating the support, the arrangement of the imaging mirror relative to the convex mirror can be changed. Or 2. The field of view enlarging tool described in 1.
4). The support is made of a transparent cavity, the bottom of the cavity is connected to the convex mirror, and the top of the cavity is connected to the imaging mirror. To 3. A field of view enlarging device according to any of the above.
5. A space is provided in the space provided on the top of the support, a pair of first protrusions are provided at symmetrical positions on the outer periphery of the frame, and the first protrusions are provided at symmetrical positions on the inner periphery of the frame. A pair of second convex portions are provided in a direction orthogonal to each other, the first convex portions are slidably engaged with a pair of concave portions provided at symmetrical positions of the support, and the second convex portions are formed as described above. 1. An imaging mirror rotating mechanism for rotating the imaging mirror by being slidably engaged with a pair of recesses provided at symmetrical positions on the outer periphery of the mirror. To 3. A field of view enlarging device according to any of the above.
6). The support includes a sliding body provided with the imaging mirror so as to be movable with respect to a plane perpendicular to the optical axis of the convex mirror. To 3. The visual field enlarging tool according to any one of the above.
7). 5. The imaging mirror rotating mechanism provided in the through hole provided in the sliding body. The field of view enlarging tool described in 1.
8). Above 1. To 7. Glasses comprising the field-of-view magnification tool according to any of the above as eyeglass lenses for both eyes.

The field magnifying tool of the present invention utilizes the property that a convex mirror aggregates a wide range of images, and reflects a wide range image from the outside reflected in the convex mirror to an imaging mirror disposed opposite to the convex mirror. Then, by looking into the imaging mirror through a through-hole provided in the convex mirror, even a person with a narrow field of view who has only a central visual field can see an image with an enlarged visual field.
Most of the visual field stenosis is afferent stenosis in which the visual field region remains in the center of the retina. Therefore, even a person with severe visual field constriction who can see only the circle with a radius of 10 ° in the center and cannot see the surroundings at all, sees a wide range image of the outside world through the through-hole in the center of the convex mirror. It is possible. Therefore, according to the visual field enlarging tool of the present invention, it is possible to easily and effectively expand the visual field of a person with narrowed visual field.
In addition, when a plane mirror is used as the imaging mirror, the field-of-view magnification tool can be manufactured more easily than when a convex mirror, a concave mirror, or the like is used.

Here, if there is a deviation in the optical axis of the imaging mirror with respect to the convex mirror, the image projected on the convex mirror cannot be sufficiently captured into the imaging mirror, and a wide-range image cannot be captured in the field of view. .
Therefore, it is preferable that the arrangement of the imaging mirror with respect to the convex mirror can be changed by operating the support. In this case, the deviation of the optical axis of the imaging mirror with respect to the convex mirror can be corrected.
Moreover, it is preferable that a support body consists of a transparent hollow body, and if it is this, it will not disturb the light from the outside by being transparent. Furthermore, since it is a hemisphere, a stable shape can be maintained, the imaging mirror can be securely fixed to the top of the hemisphere, and the optical axis of the imaging mirror relative to the convex mirror can be prevented from shifting.
Furthermore, it is preferable to provide an imaging mirror rotating mechanism in the space provided at the top of the support, and in this case, the optical axis shift due to the angle of the imaging mirror with respect to the convex mirror can be corrected.
The support preferably includes a slidable sliding body to which the imaging mirror can be attached so that the imaging mirror can be moved in a direction perpendicular to the optical axis of the convex mirror. It is possible to correct the deviation of the optical axis caused by the horizontal position of the imaging mirror with respect to the convex mirror.
Further, it is more preferable that the through-hole provided in the sliding body is provided with an imaging mirror rotating mechanism. In this case, the optical axis caused by both the angle and the horizontal position of the imaging mirror with respect to the convex mirror The deviation can be corrected.

  And if it is spectacles provided with the visual field expansion tool as a spectacle lens, wearing to a person is easy and it is convenient at the time of use. The field of view further expands by viewing with both eyes. Further, by viewing with both eyes, it is possible to prevent the left and right eyes from complementing each other and preventing the reflector from obstructing the field of view.

The field-of-view magnifier includes a convex mirror having a through-hole in the center, an imaging mirror that reflects the reflected light from the convex mirror, and an imaging mirror that is disposed opposite the convex mirror, and a support that connects the convex mirror to the imaging mirror. By looking at the imaging mirror through the through-hole, it is possible to see an image with a wider field of view than when the field magnifier is not used.
The “imaging mirror” may be any mirror that can reflect the light collected by the convex mirror toward the retina of the eye, and may be a plane mirror, a convex mirror, a concave mirror, or the like. A plane mirror is preferred. The “central portion” is preferably the center of the convex mirror, but may include the vicinity of the center slightly shifted from the center.

As shown in FIG. 1, the visual field magnifier 40 of the present invention includes a convex mirror 20 having a through hole 20 a having a diameter of 2 to 3 mm in the center, and a diameter that is opposed to the central surface of the convex mirror 20 at a position of 2 to 3 cm. A plane mirror 10 that is an imaging mirror of about 1 cm and a hollow body 30 as a support are provided.
The hollow body 30 is made of a transparent hemisphere, and the bottom inner surface thereof is fitted and bonded to the side surface 20 b of the convex mirror 20. The plane mirror 10 is bonded and fixed at a position facing the convex mirror 20 at the top of the inner surface. The back surface of the convex mirror 20 is coated with a black material so as to prevent light from other than the through hole from entering the eye.
Further, the hollow body 30 is made of a transparent resin or the like so that light from the outside is not hindered. Furthermore, since it is a hemispherical body, a stable shape can be maintained, and the plane mirror 10 can be securely fixed to the top of the hemisphere, and the optical axis of the plane mirror 10 can be prevented from being displaced with respect to the convex mirror 20. If there is a deviation in the optical axis of the plane mirror 10 with respect to the convex mirror 20, the image projected on the convex mirror 20 cannot be sufficiently taken into the plane mirror 10 that is an imaging mirror, and a wide range image is formed, and in the field of view. This is because it cannot be captured.

  Hereinafter, the operation of the present embodiment will be described. As shown in FIG. 2, it arrange | positions so that the back surface of the convex mirror 20 may be looked into the through-hole 20a in the position of about 12 mm in front of a person with a visual field constriction. The light from the points A and B of the object 25 travels along the arrow, is first reflected by the convex mirror, and then appears as A ′ and B ′ on the surface 10 a of the plane mirror 10. Furthermore, the light from A ′ and B ′ appears as A ″ and B ″ on the retina of the eye, and the entire image of the object 25 can be captured. Therefore, even a person with a narrowed visual field having only a central visual field can collect and capture a wide field of view in a narrow visual field at once. On the other hand, as shown in FIG. 3, if no means is used, a person with a narrowed field of view having only a central field of view will have the light from points C and D of the object 25 projected onto the retina as C ′ and D ′. The range beyond the CD cannot be taken into the field of view at once.

  As shown in FIG. 4, a space 30 a may be provided at the top of the cavity 30 and an imaging mirror rotating mechanism 50 may be provided. The imaging mirror rotating mechanism 50 has the following configuration. A frame 51 having a pair of first protrusions 51 a at a symmetrical position on the outer periphery and a pair of second protrusions 51 b in a direction orthogonal to the first protrusion 51 a at a symmetrical position on the inner periphery. The first convex portion 51a is slidably engaged with a pair of concave portions 30b provided at the symmetrical position of the top of the hollow body 30, and the second convex portion 51b is coupled with a pair of concave portions 52a provided at the symmetrical position on the outer periphery of the plane mirror 52. The plane mirror 52 is made rotatable by being slidably engaged. By attaching this mechanism, it is possible to change the angle of the plane mirror 52 that is an imaging mirror with respect to the convex mirror 20. Then, even if the optical axis shift of the plane mirror 52 with respect to the convex mirror 20 occurs, the optical axis shift caused by the angle can be corrected.

As shown in FIG. 5, it is also possible to attach the sliding body 61 with the plane mirror 62 attached to the space portion 30 a so as to be slidable in the groove portion 31 provided in the hollow body 30. By doing so, it is possible to move the sliding body 61 in the horizontal direction with respect to the convex mirror by placing a finger on the anti-slip member 61a, and the optical axis shift due to the horizontal position of the plane mirror 62 with respect to the convex mirror 20 Can be corrected.
Further, a space portion can be provided in the center of the sliding body 61 and the imaging mirror rotating mechanism 50 can be attached. In this way, it is possible to correct the deviation of the optical axis caused by both the angle of the plane mirror 62 that is the imaging mirror with respect to the convex mirror 20 and the position in the horizontal direction.

Embodiments of the field-view magnifier using another support are shown in FIGS. The configuration other than the support is the same as the configuration of FIG.
The field expanding tool 41 shown in FIG. 6 has a plurality of transparent long bodies 31 as a support, and is configured by bonding and fixing a plurality of transparent long bodies 31 to the side surface of the plane mirror 10 and the side surface of the convex mirror 20. ing. A wire can be used in place of the long body 31. If these supports can be bent, the optical axis shift of the plane mirror 10 with respect to the convex mirror 20 can be corrected by bending by hand.

  In the visual field enlarging tool 42 shown in FIG. 7, one end of a rod-like body 32 as a support is fitted and bonded to a small hole provided in the convex mirror 20, and the other end is slidably connected to a small hole provided in the plane mirror 10. ing. In this case, the optical axis can be corrected by moving the plane mirror 10 by hand. On the other hand, one end of the rod-shaped body 32 is fitted and bonded to the plane mirror 10 and the other end is slidably connected to a small hole provided in the convex mirror 20 so that the optical axis can be corrected. You can also

As shown in FIG. 8, the field-of-view magnifier 1 of the present invention is provided with the field-enlargement tool 40 shown in FIG. 1, and the bottom outer surface 30 a of the cavity 30 is fitted to the inner surface 31 of the front frame 2 of the glasses. It is glued. The field-of-view magnifier 1 is easy to wear and convenient for use. The field of view further expands by viewing with both eyes. Furthermore, the left and right eyes complement each other, and the reflecting mirror 10 can be prevented from obstructing the field of view. In addition, the visual field expansion tool using a plane rotation mechanism, a sliding body, or its combination structure can also be attached to a spectacles frame. Furthermore, the field expansion tool 41 or 42 shown in FIGS. 6 and 7 can be attached to the front frame 2 for use.
In addition to the normal glasses shown in FIG. 8, the field-of-view magnification tool of the present invention can be used by attaching to goggles or a hat.
Furthermore, it is also possible to wear the field-of-view magnification glasses of the present invention on the glasses for correcting vision such as normal myopia.
Furthermore, it is also possible to attach a lens for correcting vision to the through hole of the convex mirror.

It is a perspective view which shows the visual field expansion tool of 1st embodiment. It is explanatory drawing which shows typically how it looks at the time of using a visual field expansion tool. It is explanatory drawing which shows typically the appearance when not using a visual field expansion tool. It is a perspective view which shows an imaging mirror rotation mechanism. It is sectional drawing which shows the state in which the sliding body was attached to the hollow body. It is a perspective view which shows the visual field expansion tool of 2nd embodiment. It is a perspective view which shows the visual field expansion tool of 3rd embodiment. It is a perspective view which shows the visual field expansion glasses of embodiment.

Explanation of symbols

20a; through-hole provided in convex mirror, 20; convex mirror, 10, 52, 62; plane mirror (imaging mirror), 40, 41, 42; field magnifying tool, 30; cavity, 30a; space, 51; 51a; first convex portion, 51b; second convex portion, 30b; concave portion, 50; imaging mirror rotating mechanism, 61; sliding body, 1;

Claims (8)

A convex mirror with a through hole in the center;
An imaging mirror that reflects the reflected light from the convex mirror and is disposed opposite to the convex mirror;
And a support that connects the convex mirror to the imaging mirror.   2. The field magnification tool according to claim 1, wherein the imaging mirror is a plane mirror.   The visual field enlarging tool according to claim 1 or 2, wherein the arrangement of the imaging mirror with respect to the convex mirror can be changed by operating the support.   The said support body consists of a transparent cavity body, The bottom part of this cavity body is connected with the said convex mirror, The top part of this cavity body is connected with the said imaging mirror. Field of view magnifier. A space is provided in the space provided on the top of the support,
A pair of first convex portions are provided at symmetrical positions on the outer periphery of the frame,
A pair of second convex portions are provided in a direction orthogonal to the first convex portion at a symmetrical position on the inner periphery of the frame,
The first convex portion is slidably engaged with a pair of concave portions provided at symmetrical positions of the support, and the second convex portion is slid with a pair of concave portions provided at symmetrical positions on the outer periphery of the imaging mirror. The visual field enlarging tool according to any one of claims 1 to 3, further comprising an imaging mirror rotating mechanism that allows the imaging mirror to rotate by being movably engaged.   The field-of-view enlargement tool according to any one of claims 1 to 3, wherein the support body includes a sliding body that provides the imaging mirror so as to be movable on a plane perpendicular to the optical axis of the convex mirror. .   The visual field enlarging tool according to claim 6, wherein the imaging mirror rotation mechanism is provided in a through hole provided in the sliding body.   An eyeglass comprising the visual field enlarging tool according to claim 1 as a spectacle lens in both eyes.

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