JP3049180U - Wide field binoculars - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to assemble high-magnification binoculars having a wide field of view and a bright field of view in a lightweight and compact manner, and to provide them with good productivity and low cost. In a binocular optical system in which an inverting reflecting optical system is interposed between an objective lens system and an eyepiece lens system, a first reflecting mirror disposed at an angle of 45 ° with respect to an incident optical axis;
An isosceles right-angled triangular prism in which the ridge of the roof surface is positioned on an axis parallel to the incident optical axis so that the reflected light is received by a part of the hypotenuse surface of the prism, and a reflected light by the isosceles right-angled triangular prism A second reflecting mirror positioned opposite to the other portion of the hypotenuse surface from which the light exits, and disposed at an angle of 45 ° with respect to the reflecting optical axis to constitute an inverting reflecting optical system, and an objective lens system and an eyepiece A relay lens disposed between the system and the system is provided at a position close to the second reflecting mirror.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The invention relates to binoculars having a wide field of view and a bright field of view. More specifically, the present invention relates to a pair of binoculars having an inverted reflection optical system between an objective lens system and an eyepiece lens system, and having a wide field of view and a bright field of view.

[0002]

[Prior art]

 In sports such as soccer and rugby that take place on large grounds, it is necessary to watch the game while following fast-moving players, and in a theater with a wide field of view, it is necessary to watch acting in a field of view that extends to the left and right of the stage. In such cases, the use of binoculars with a wide field of view was desired.

As binoculars used for this kind of application, binoculars generally called opera glasses have been used. However, since the opera glass is composed of a so-called Galilean optical system that uses a condenser lens for the objective lens and a divergent lens for the eyepiece, the convenience of being compact, light, and easy to use as a whole is However, his view was not always satisfactory because his view was narrow, his field of view was dark, and his magnification was low.

[0004] Conversely, high-magnification binoculars incorporate an inverting reflection optical system combining two or three prisms between an objective lens system and an eyepiece lens system, and the constituent optical systems are also complicated. In view of magnification, the magnification is more than 7 times, but on the other hand, the actual field of view is relatively narrow, about 10 °, and in terms of the field of view, observation is performed on an object that moves fast. Not suitable for doing.

[0005]

[Problems to be solved by the invention]

 In such high-magnification binoculars, the inverted reflection optical system interposed between the objective lens system and the eyepiece lens system has been an obstacle to obtaining a wide field of view by design. Many depended on the design of the telephoto optical system. As a result, the configuration of the telephoto optical system itself became complicated, and the weight, size, and price were greatly affected, making it inconvenient to carry, and the operability deteriorated.

In general terms, the trade-off condition that the field of view becomes narrower with higher magnification cannot be fundamentally avoided, but as one means for obtaining a wide field of view, the focal length must be as small as possible. It is desirable to use a short objective lens. On the other hand, if an inverted reflection optical system consisting of two or three prisms is incorporated in an erect image system, the focal length of the objective lens system in consideration of the length of the optical path by these prisms is required, and the size of the prisms is increased. As a result, the size of the entire binoculars becomes bulky, which goes against the compactness required for carrying. In addition, the size of the reflection reversal optical system composed of prisms also governs the size of the objective lens.

[0007] The present invention is intended to provide binoculars having a high magnification and a brighter field of view in a wide field of view under the above-described restrictions.

[0008]

[Means for Solving the Problems]

 In constructing a reversing reflection optical system interposed between the objective lens system and the eyepiece lens system, a first reflecting mirror arranged at an angle of 45 ° with respect to the incident optical axis, and reflected light from the first reflecting mirror is formed on the hypotenuse of the prism. An isosceles right-angled triangular prism in which the ridge of the roof surface is positioned on an axis parallel to the incident optical axis so as to be received by a part of the surface, and the hypotenuse surface from which light reflected by the isosceles right-angled triangular prism is emitted A second reflecting mirror positioned opposite to the other part of the optical system and disposed at an angle of 45 ° with respect to the reflected optical axis, and is provided between the objective lens system and the eyepiece lens system. Is provided at a position close to the second reflecting mirror.

Further, in order to achieve the object of the present invention more effectively, a relay lens disposed between the objective lens system and the eyepiece lens system is a meniscus lens, and its convex surface is directed to the incident side. A part of the second reflecting mirror is positioned so as to intervene in a projection area projected on a horizontal plane including the optical axis.

[0010] By adopting such a configuration, it is possible to obtain binoculars having a wide field of view and a bright field of view, while incorporating a reversing reflection optical system.

[0011]

[Embodiment of the invention]

 In this invention, the light reflected by the second reflecting mirror heading toward the eyepiece lens system is refracted by the relay lens near the second reflecting mirror and made incident on the eyepiece lens system, so that a wide field of view and a bright field of view can be obtained. In this case, as a means to make the relay lens occupy a position closer to the second reflecting mirror, the convex surface of the relay lens is directed to the incident side, and the peripheral edge is the second reflecting mirror. It is set in a position very close to or not in contact with the reflecting surface of the mirror, so that the second reflecting mirror partially intervenes in the projection area cast on a horizontal plane including the optical axis. Position it.

[0012]

【Example】

 In FIG. 1, reference numeral 11 denotes an objective lens system. In this case, a biconvex condensing lens 13 and a meniscus diverging lens 15 are bonded as a composite condensing lens. Reference numeral 12 denotes an eyepiece lens system. In this case, an aspherical bifocal lens is provided in front of a group of lenses formed as a compound condensing lens in which a meniscus diverging lens 16 is bonded behind a biconvex condensing lens 14. A convex condensing lens 18 is provided, and a plano-convex condensing lens 20 is disposed immediately behind the composite condensing lens with the convex surface facing the incident side.

Reference numeral 17 denotes a relay lens interposed between the objective lens system 11 and the eyepiece lens system 12, and is constituted by a meniscus condenser lens having a convex surface on the incident side. FIG. 2 is a development view of a telephoto optical system using each of these lenses. In the figure, an area indicated by a symbol MPM indicates a length of an optical path on an optical axis by an inverted reflection optical system necessary for binoculars. The area indicated by the symbol P indicates the length of the optical path on the optical axis by the isosceles right-angled triangular prism in the inverting reflection optical system.

The inverted reflection optical system, generally designated by the reference numeral 30, is interposed between the objective lens system 11 and the eyepiece lens system 12 so as to visually recognize an erect image as binoculars. When the relay lens 17 located between the eyepiece lens system 12 and the relay lens 17 is a condensing lens, a wider field of view is generally obtained as the relay lens 17 is located closer to the objective lens system.

Therefore, the relay lens 17 is arranged at a position as close as possible to the inverted reflection optical system 30 interposed between the objective lens system 11 and the eyepiece lens system 12. In order to arrange the relay lens 17 as close as possible to the inversion reflection optical system 30, the inversion reflection optical system 30 is arranged at an angle of 45 ° with respect to the incident optical axis XX as described below. A first reflecting mirror 41, a single isosceles right-angled triangular prism 31, and a second reflecting mirror 42 arranged at an angle of 135 ° with respect to the incident optical axis XX. That is, the second reflecting mirror 42 is arranged at an angle of 45 ° with respect to the optical axis of the reflected light emitted from the isosceles right-angled triangular prism 31. More specifically, the first reflection mirror 41 is arranged at an angle of 45 ° with respect to the incident optical axis XX, and therefore, is arranged along the incident optical axis XX. The incident light is reflected by the first reflecting mirror 41 in a direction orthogonal to the incident optical axis XX. This reflected light is introduced into the hypotenuse surface of a single isosceles right-angled triangular prism 31 having a light incident surface orthogonal to the optical axis of the reflected light.

The isosceles right-angled triangular prism 31 has one side of the hypotenuse surface (a plane including the hypotenuse of the isosceles right triangle) serving as an incident surface 33 for introducing the light reflected by the first reflecting mirror 41. The other side of the hypotenuse surface (the plane including the hypotenuse of the isosceles right triangle) is defined as the exit surface 34 of the reflected light in the prism (see FIG. 3).

The isosceles right-angled triangular prism 31 has a ridgeline 32 and a roof surface connected to both sides thereof, and one of the roof surfaces serves as a first reflection surface 35 for light introduced into the prism 31 and the other serves as a first reflection surface. This is the second reflection surface 36 of the introduced light reflected by the one reflection surface 35.

The light on the optical axis reflected by the second reflection surface 36 exits from the exit surface 34 of the prism 31 in a direction perpendicular to the same, and the second reflection mirror 42 located opposite to the exit surface 34. And travels toward the relay lens 17 along the optical axis XX.

As described above, the light on the incident optical axis XX reaching the inverting reflection optical system 30 is reflected on the respective reflection surfaces of the first reflection mirror 41, the isosceles right-angled triangular prism 31, and the second reflection mirror 42. Then, the light is emitted toward the eyepiece system 12 along the optical axis XX, during which the image of the outside world is inverted and formed into an erect image. In the case of the present invention, however, the right-angled triangles are orthogonal to each other. A first prism whose one of the surfaces faces the incident optical axis and is perpendicular to the optical axis, and one of the bottom surfaces including the hypotenuse of an isosceles right triangle below the other surface of the first prism that is orthogonal to the other surface. And a second prism consisting of a right-angled triangle with the ridges of the roof surface positioned parallel to the incident optical axis, and a right-angled triangle above the other part of the bottom surface of the second prism. One of the orthogonal surfaces is opposed and the other orthogonal surface is the exit surface. Unlike the case of using a well-known inverted reflection optical system configured with three prisms, the final reflection surface directed to the relay lens 17 and the eyepiece lens system 12 is provided by the reflection mirror 42. Therefore, the relay lens 17 is Since the relay lens 17 is not opposed to the third prism but is opposed to the reflecting mirror 42, the relay lens 17 can be advanced and positioned to a position immediately before contacting the reflecting mirror 42. 17 is a meniscus condensing lens having a convex surface on the incident side and a concave surface on the exit side as described above, so that the peripheral edge thereof is set to a position advanced to a position immediately before coming into contact with the reflecting mirror 42. At this time, it is also possible to position the convex surface of the relay lens 17 so as to enter a projection area which the reflecting mirror 42 projects on a horizontal plane including the optical axis XX. Therefore, by bringing the relay lens 17 as close as possible to the second reflecting mirror 42, the field of view of the binoculars having the same magnification can be made wider and the field of view can be made brighter.

[0020]

[Effect of the invention]

 According to the present invention, in order to reversely reflect the non-converged light incident from the objective lens system, an inverted reflection optical system composed of a combination of three prisms as described above is not used, and an isosceles right triangle is used. A first prism consisting of a right-angled triangle in which a part of the bottom surface including the hypotenuse is orthogonal to the incident optical axis and the ridge line of the roof surface is located in a horizontal plane orthogonal to the incident optical axis; The reflected light reflected by each surface of the bottom surface and emitted from another portion of the bottom surface in the opposite direction parallel to the incident optical axis is received by a part of the bottom surface including the hypotenuse of the isosceles right triangle. Also use an inverted reflection optical system consisting of a combination of two prisms in combination with a second prism consisting of a right-angled triangular ridge arranged so that the ridgeline of the roof surface is located in a plane orthogonal to the incident optical axis. Without incident light As the first reflection surface, the reverse reflection optical system that guides the incident light to the final reflection surface through one isosceles right-angled triangular prism is used, so the relay lens is the final reflection surface on the optical axis. It can be set to a position very close to the reflector, which makes it possible to obtain a wider field of view and a brighter field of view than binoculars having the same magnification. In addition, since a single prism is used, the overall structure is reduced in weight, enhancing the convenience of carrying and improving the operability.

[Submission date] January 23, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

As a general theory, it is not possible to fundamentally avoid the trade-off condition that the field of view becomes narrower when the magnification is increased. However, as one means for obtaining a wide field of view, the focal length must be as short as possible. It is desirable to use an objective lens. On the other hand, if an inverted reflection optical system composed of two or three prisms is incorporated in an erect image system, the field of view will be narrowed by this, and in addition, the objective taking into account the length of the optical path due to these prisms will be considered. Since the focal length of the lens system is required and the size of the binoculars becomes bulky due to the size of the prism, it goes against the compactness required for carrying. In addition, the size of the inverted reflection optical system composed of prisms also governed the size of the objective lens.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

Further, in order to more effectively achieve the object of the present invention, a relay lens disposed between the objective lens system and the eyepiece lens system is a meniscus lens, and its convex surface is directed to the incident side. A part of the convex surface of the meniscus relay lens is interposed and positioned within a projection area projected by the second reflecting mirror on a horizontal plane including an optical axis.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010] In this case, the more you objective lens system a large diameter, also The closer to first reflecting mirror as possible to-objective lens system, preferably supposed to obtain a bright visual field with a wide field of view . According to this configuration, even a binocular having a zoom optical system with a narrow field of view can be a binocular having a wider field of view and a bright field of view. By adopting such a configuration, it is possible to obtain binoculars having a wide field of view and a bright field of view, while incorporating a reversing reflection optical system.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

[0020]

[Effect of the invention]

 According to the present invention, in order to reversely reflect the non-converged light incident from the objective lens system, an inverted reflection optical system composed of a combination of three prisms as described above is not used, and an isosceles right triangle is used. A first prism consisting of a right-angled triangle in which a part of the bottom surface including the hypotenuse is orthogonal to the incident optical axis and the ridge line of the roof surface is located in a horizontal plane orthogonal to the incident optical axis; The reflected light reflected by each surface of the bottom surface and emitted from another portion of the bottom surface in the opposite direction parallel to the incident optical axis is received by a part of the bottom surface including the hypotenuse of the isosceles right triangle. Also use an inverted reflection optical system consisting of a combination of two prisms in combination with a second prism consisting of a right-angled triangular ridge arranged so that the ridgeline of the roof surface is located in a plane orthogonal to the incident optical axis. Without incident light As the first reflection surface, the reverse reflection optical system that guides the incident light to the final reflection surface through one isosceles right-angled triangular prism is used, so the relay lens is the final reflection surface on the optical axis. It can be set to a position very close to the reflector, which makes it possible to obtain a wider field of view and a brighter field of view than binoculars having the same magnification. In addition, the variable magnification binoculars incorporating the zoom optical system do not have a specific magnification change. However, it is possible to give a wider field of view. You. Furthermore,As an inverted reflection optical system,Since a single prism is used, the overall structure is made lighter, making it easier to carry and has a remarkable effect on improving operability.

[Brief description of the drawings]

FIG. 1 is a diagram showing an optical system in an embodiment of wide field binoculars according to the present invention.

FIG. 2 is a development view of an optical system of the wide-view binoculars in the embodiment of FIG.

FIG. 3 is a front view of the inverted reflection optical system of the wide-view binoculars according to the embodiment of FIG. 1;

FIG. 4 is a perspective view of the inverted reflection optical system of the wide-view binoculars according to the embodiment of FIG. 1;

[Explanation of symbols]

 11 Objective lens system 12 Eyepiece system 13 Biconvex condenser lens 14 Biconvex condenser lens 15 Meniscus divergent lens 16 Meniscus divergent lens 17… Relay lens 18 Aspherical biconvex condenser lens 20 Plano-convex lens 30 Inverting reflection optical system 31 Isosceles right-angled triangular prism 32… Ridge line 33… Incident surface 34… ... Outgoing surface 35... First prism reflecting surface 36... Second prism reflecting surface 41... First reflecting mirror 42.

Claims (3)

[Utility model registration claims] 1. A binocular optical system in which an inverting reflecting optical system is interposed between an objective lens system and an eyepiece lens system, a first reflecting mirror arranged at an inclination of 45 ° with respect to an incident optical axis, and An isosceles right-angled triangular prism in which the ridge of the roof surface is positioned on an axis parallel to the incident optical axis so that reflected light is received by a part of the hypotenuse surface of the prism, and reflected light from the isosceles right-angled triangular prism is emitted And a second reflecting mirror positioned opposite to the other side of the hypotenuse surface and disposed at an angle of 45 ° with respect to the reflecting optical axis to constitute an inverting reflecting optical system, comprising an objective lens system and an eyepiece lens system. Wide-view binoculars, wherein a relay lens disposed between them is provided at a position close to the second reflecting mirror. 2. A binocular optical system in which an inverting reflecting optical system is interposed between an objective lens system and an eyepiece lens system, a first reflecting mirror disposed at an angle of 45 ° with respect to an incident optical axis, and An isosceles right-angled triangular prism in which the ridge of the roof surface is positioned on an axis parallel to the incident optical axis so that reflected light is received by a part of the hypotenuse surface of the prism, and reflected light from the isosceles right-angled triangular prism is emitted And a second reflecting mirror positioned opposite to the other side of the hypotenuse surface and disposed at an angle of 45 ° with respect to the reflecting optical axis to constitute an inverting reflecting optical system, comprising an objective lens system and an eyepiece lens system. Wide-field binoculars characterized in that a meniscus relay lens disposed between them is provided at a position close to the second reflecting mirror with its convex surface facing the incident side. 3. A binocular optical system in which an inverting reflecting optical system is interposed between an objective lens system and an eyepiece lens system, a first reflecting mirror arranged at an angle of 45 ° with respect to an incident optical axis, and An isosceles right-angled triangular prism in which the ridge of the roof surface is positioned on an axis parallel to the incident optical axis so that reflected light is received by a part of the hypotenuse surface of the prism, and reflected light from the isosceles right-angled triangular prism is emitted And a second reflecting mirror positioned opposite to the other side of the hypotenuse surface and disposed at an angle of 45 ° with respect to the reflecting optical axis to constitute an inverting reflecting optical system, comprising an objective lens system and an eyepiece lens system. Characterized in that the convex surface of the meniscus relay lens disposed between them is directed to the incident side, and a part of the second reflective mirror is interposed in a projection area projected on a horizontal plane including the optical axis. Wide field of view binoculars