JP3037271U - Low magnification wide field of view binoculars - Google Patents

Abstract

(57) [Abstract] [Problem] As binoculars for use in a wide field of view such as theater theater and sports watching, it enables observation over a wide field of view under a bright field of view, and is lightweight.
The purpose is to improve portability and usability by making it compact. In order to perform reverse reflection of an image, a reverse reflection optical system on the object side and a reverse reflection optical system on the eyepiece side using two pairs of specular reflection plates facing each other are arranged. The emitted light parallel to the central optical axis of the light incident on the reverse reflection optical system on the objective side is emitted from the eyepiece side reverse reflection optical system with the central optical axis as the center optical axis, and each reflection by the specular reflection plate that constitutes the reverse reflection optical system. One or a plurality of objective lenses are interposed in any one of the optical paths.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to binoculars that provide a wide field of view and a bright field of view at low magnification.

[0002]

[Prior art]

 In a field with a wide field such as soccer or rugby, you can watch a fast-moving player, or in a theater with a wide field of vision, to see the left and right sides of the stage under a bright field of view, use a low magnification. Even if there were, there was a demand for binoculars with a wide field of view.

As such low-power binoculars, binoculars usually called opera glasses have been generally used. However, because opera glasses consist of a so-called Galerio optical system that uses a convex lens as the objective lens and a concave lens as the eyepiece, it has the advantage of being compact and lightweight, but it has a dark field of view and a narrow field of view. It is well known that it is difficult to see when viewed.

On the contrary, in high-powered binoculars, a reflection / reversal optical system incorporating a plurality of prisms is used to obtain a high power of 7 times or more, but the actual field of view is 10 The degree of visibility is not suitable for tracking fast moving objects.

[0005]

[Problems to be solved by the device]

 Even if the contradictory optical condition that the field of view becomes narrower when the magnification is increased is inevitable, it is desirable to use an objective lens with a focal length as short as possible in order to obtain a wide field of view. In this case, if a prism is used for the erecting system, the focal length of the objective lens corresponding to the optical path of the prism is required, and it becomes bulky due to the size of the prism. Become. Not only that, the size of the prism also affects the size of the objective lens, and in addition to this, the eyepiece lens also becomes huge, making it bigger and heavier binoculars as a whole, and manufacturing costs rise.

The present invention addresses these series of problems and provides binoculars that are small in size and light in weight, and provide binoculars with a wide field of view and a bright field of view even at low magnification.

[0007]

[Means for Solving the Problems]

 With the above intent, in the present invention, the optical component part receives the incident light reflected by the first specular reflecting plate arranged on the objective side with an inclination of 45 ° with respect to the incident optical axis. And a second specular reflection plate that reflects the light on the central optical axis in a direction orthogonal to the light on the incident optical axis and forms a reflection reversal optical system on the objective side. A third specular reflector that reflects the light reflected by the second specular reflector, and also retrogrades in a direction parallel to the light on the optical axis incident on the second specular reflector; Eyepiece with a fourth mirror-reflecting plate that receives and reflects light reflected by the mirror-reflecting plate of 3 and directs light on the central optical axis thereof in a direction parallel to the incident optical axis of the first mirror-reflecting plate. Side reflection reversal optics, and the eyepiece side reflection reversal optics The eyepiece lens is arranged behind the light exit side of the, and any of the reflected light paths between the reflected light path by the first specular reflector and the light path reaching the fourth specular reflector is orthogonal to the reflected light axis. And an objective lens is interposed.

As a typical example of each of the reflection optical paths in which the objective lens is arranged, an objective lens is provided between the first and second specular reflection plates to reflect light from the first specular reflection plate. Place it orthogonal to the axis.

Further, in consideration of the design point of the outer shell formed by enclosing each of these optical systems, the objective lens is used as another reflection optical path, for example, a reflection reversal optical system on the eyepiece side. It may be arranged between the second mirror-reflecting plate and the fourth mirror-reflecting plate, or between the object-side reflection reversing optical system and the eyepiece-side reflection reversing optical system, that is, the second mirror-reflecting plate and the second mirror-reflecting plate. The objective lens may be disposed between the mirror reflection plate 3 and the mirror reflection plate 3.

Further, a reflected light path between the first specular reflector and the second specular reflector, a reflected light path between the second specular reflector and the third specular reflector, and a third specular reflector. It is also possible to select any of a plurality of reflected light paths among the three reflected light paths of the reflected light path between the mirror and the fourth specular reflection plate and arrange an objective lens in each of them, which is orthogonal to the optical axis of the reflected light path.

In this case, the surface of each of the first to fourth specular reflectors is a mirror surface, and each of the mirror surfaces is covered with a protective thin film having a moisture-proof function that prevents corrosion of the mirror surface.

Further, in consideration of convenience in assembling each of the first to fourth specular reflectors, they are integrally held by a casing capable of incorporating them, and the objective is housed in the casing. Build a lens.

Furthermore, in order to collect the binoculars as a whole compactly and to make them lightweight and bulky, an intermediate lens composed of a condenser lens is incorporated in proximity to the light exit end side of the fourth specular reflector, Useful for shortening the focal length of the objective lens.

[0014]

[Embodiment of the invention]

 In order to facilitate understanding of the correlative arrangement of the main optical elements, which is a feature of the present invention, a case where an objective lens is interposed between the first specular reflection plate and the second specular reflection plate is shown in FIG. While the arrangement of each optical element is shown by the oblique views of FIG. 1 and FIG. 2, in this case, according to the development view of FIG. 5 and the side view of FIG. 6, the light enters from the first specular reflection plate until the light exits from the eyepiece. The optical path of the light is shown.

A preferred embodiment shown in each of these figures will be described below. However, it goes without saying that these drawings show one optical structure that constitutes the binoculars, and the other optical structure is symmetrically arranged with respect to the illustrated structure. .

[0016]

【Example】

 In each figure, the portions denoted by reference numerals 11, 12, 13, and 14 are the first specular reflection plate, the second specular reflection plate, the third specular reflection plate, and the fourth specular reflection plate, respectively. Hereinafter, the structure of the present invention will be clarified by referring to the first mirror, the second mirror, the third mirror, and the fourth mirror.

The first mirror 11 is arranged on the objective side with an inclination of 45 ° with respect to the incident optical axis, and the reflected light reflected by the first mirror 11 is received by the second mirror 12 so that the second mirror 12 receives it. However, in this case, the light on the central optical axis that is incident on the first mirror is reflected light that is turned at a right angle due to the 45 ° arrangement of the first mirror 11, and is reflected by the second mirror. Head to the center of 12.

The first mirror 11 and the second mirror 12 are arranged such that their respective mirror surfaces are orthogonal to each other.

The third mirror 13 occupies a position common to the axis parallel to the incident optical axis, that is, a position symmetrical to the axis parallel to the incident optical axis, with respect to the second mirror 12. The light incident on the central optical axis 12 is reflected by the second mirror 12 toward the center of the third mirror 13, and the reflected light reflected by the third mirror 13 is directed toward the center of the fourth mirror 14. To be As a result, the ray reflected by the first mirror 11 on the central optical axis and the ray reflected by the third mirror 13 on the central optical axis are parallel to each other, but the light traveling directions are opposite. .

The fourth mirror 14 is located directly above the third mirror 13, and its mirror surface is arranged orthogonal to the third mirror 13, so that the fourth mirror 14 is on the central optical axis reflected by the third mirror 13. The light is further reflected by the fourth mirror 14, and is arranged so as to follow the emission path parallel to the light on the central optical axis that enters the first mirror 11 and head for the eyepiece lens 30.

As a result, a reflection reflection optical system forming a pair of the first mirror 11 and the second mirror 12 located on the objective side, and an eyepiece side reflection forming a pair of the third mirror 13 and the fourth mirror 14. The inverting optical system has the same function as a reflection inverting erecting optical system in which the hypotenuse surface of two triangular prisms is used as a reflecting surface.

In the present invention, the objective lens 20 is provided between the first mirror 11 and the second mirror 12, which are located on the objective side, in combination with the reflection-reversing erecting optical system using such a mirror. The optical path length that passes through the two prisms that have been used as a reflection inversion erecting optical system, which is characterized by the interposition, obstructs the shortening of the focal length of the objective lens. The defect is eliminated, the focal length of the objective lens is shortened to contribute to the widening of the field of view, and in addition, the overall length of the optical system that constitutes the binoculars is shortened, resulting in a smaller size.

By using a plate-like mirror surface as a reflecting surface without using a prism that becomes heavy in weight and without using an optical system that repeats transmission and reflection of a glass material, In consideration of this point, in the present invention, each of the first to fourth mirrors has a mirror surface formed on the surface of the plate-like glass by means such as metal vapor deposition, or the surface of the metal plate is polished to be young. It is desirable to apply metal vapor deposition on the polished surface to make these surfaces mirror-faced for reflection. This allows refraction and reflection due to transmission of the glass plate, transmission after reflection, and optics due to refraction. However, since such a vapor-deposited mirror surface is exposed to the outside air, it is necessary to cover the mirror surface with a protective thin film to prevent metal corrosion and to protect against external moisture. deep.

Since the reflective optical elements from the first mirror 11 to the fourth mirror 14 are made of a thin plate-shaped material as described above, when assembled into a single body as binoculars, the built-in holding is ensured over time. Therefore, if these mirrors are individually attached to the box later, it is easy to change the set position by external vibration or other external force. Therefore, as a countermeasure, it is more preferable to perform a simultaneous molding process to configure each mirror integrally with the housing when constructing a housing that supports these mirrors. As an integrated manufacturing means, each mirror is previously arranged at the predetermined position in a mold forming a housing, and the mirrors are cast together with the housing to be integrated.

Next, in order to achieve the original purpose of the present invention by more appropriate means, the light emitting end surface of the reflection inverting optical system on the eyepiece side, which is composed of a third mirror and a fourth mirror, is placed close to Further, an intermediate lens 15 composed of a condenser lens is additionally provided.

The intermediate lens 15 is located in front of and in the entrance side of the eyepiece lens 30, and the intermediate lens 15 composed of a condenser lens cooperates with the objective lens 20 to shorten the combined focal length by them. This is useful for widening the field of view, shifting the position of the eyepiece lens 30 to the entrance side, and shortening the entire optical system, thus making it possible to reduce the overall volume of the binoculars.

The above-described embodiment is an example shown in the figure, that is, the objective lens 20 is provided between the first specular reflection plate 11 and the second specular reflection plate 12 and the first specular reflection plate 11 is provided between the first specular reflection plate 11 and the second specular reflection plate 12. Although an actual example is shown in which the optical axis is perpendicular to the optical axis of the reflected optical path, other examples are not shown in the drawings, but are omitted from the illustration because it is obvious from the above description. When the objective lens 20 is arranged between the third specular reflection plate 13 and the fourth specular reflection plate 14 so as to be orthogonal to the optical axis reflected by the third specular reflection plate 13, the second specular reflection It should be understood as an example of the binoculars according to the present invention also when it is arranged between the plate 12 and the third mirror-reflecting plate 13 so as to be orthogonal to the optical axis reflected by the second mirror-reflecting plate 12. .

Furthermore, the optical axis of the reflection optical path between the first specular reflector 11 and the second specular reflector 12, and the reflection between the second specular reflector 12 and the third specular reflector 13 Select any two or three on the optical axes of the optical path, the three optical axes of the reflected optical path between the third specular reflection plate 13 and the fourth specular reflection plate 14 and these On the other hand, the case where the objective lenses are respectively installed orthogonally to the reflection optical axis will be additionally described as an example.

[0029]

[Effect of the invention]

 According to the present invention, as is apparent from the above description, a light-weight specular reflector is used to perform the same function without forming a reflection inversion erect system with a prism made of a massive element. The objective lens can be placed in these spaces as a result of the combination of the specular reflectors, which is the result of shortening the focal point of the objective lens. You can get a wide view under.

In addition, since a specular reflector that is light in weight is used and an object lens is incorporated in a reflection and inversion optical system using these, not only a wide field of view is obtained, but also a light weight and a small bulk are obtained. It is possible to make it a different structure and to improve portability with this compactness, and to reduce physical fatigue on holding during sports watching and theater that keeps holding even during use. Also plays.

In particular, by combining the intermediate lens with the objective lens, it becomes possible to contribute to a wider angle and a more compact size, and the protection of the specular surface of the specular reflection plate and the specular reflection plate are integrated with the housing. The structure contributes greatly to long-term durability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main optical system of binoculars according to the present invention viewed from an object side.

FIG. 2 is a perspective view of the main optical system of the binoculars according to the present invention as seen from the eyepiece side.

FIG. 3 is a front view showing the arrangement of each part of the main optical system of the binoculars according to the present invention.

FIG. 4 is a rear view showing the arrangement of each part of the main optical system of the binoculars according to the present invention.

FIG. 5 is an optical development view showing each part of the optical system of the binoculars according to the present invention and an optical path therethrough.

FIG. 6 is a side view showing the actual state of the optical path of the binoculars according to the present invention.

[Explanation of symbols]

 11 First reflection mirror 12 Second reflection mirror 13 Third reflection mirror 14 Fourth reflection mirror 15 Intermediate lens 20 Objective lens 30 Eyepiece

Claims (11)

[Utility model registration claims] 1. A first specular reflector (11) arranged on the objective side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflecting plate (11). A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). An eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and each reflection between the optical path reflected by the first specular reflector plate (11) and the optical path reaching the fourth specular reflector plate (14). Low-magnification wide-view binoculars characterized in that an objective lens (20) is disposed in any one of the optical paths so as to be orthogonal to the reflection optical axis. 2. A first specular reflection plate (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflecting plate (11). A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). An eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and an objective lens (20) is provided between the first and second specular reflection plates (11, 12).
Binoculars with low magnification and wide field of view, which are arranged so as to be orthogonal to the optical axis reflected by the specular reflector (11). 3. A first specular reflector (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects incident light reflected by the first specular reflector (11), A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). An eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and an objective lens (20) is provided in the middle of the third and fourth specular reflectors (13, 14).
Low-magnification wide-field-of-view binoculars characterized by being arranged orthogonally to the optical axis reflected by the specular reflector (13). 4. A first specular reflection plate (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflecting plate (11), A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflection plate (13) that reflects backward in a direction parallel to the light incident on the optical axis, and receives and reflects light reflected by the third specular reflection plate (13), and its center An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). An eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and an objective lens (20) is provided in the middle of the second and third specular reflection plates (12, 13).
Low-magnification wide-field-of-view binoculars characterized by being arranged orthogonally to the optical axis reflected by the specular reflector (12). 5. A first specular reflector (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects incident light reflected by the first specular reflector (11), A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). An eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and any one of the reflection light paths from the reflection light path by the first specular reflection plate (11) to the fourth specular reflection plate (14). Low-magnification wide-view, characterized in that objective lenses (20) orthogonal to the optical axes of the respective optical paths are arranged in the plurality of optical paths Binoculars. 6. A first specular reflector (11) arranged on the objective side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflector (11), A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). The eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and each of the specular reflection plates (11, 12, 13, 14) is formed as a reflection plate whose surface is a mirror surface, and each mirror surface. Between the optical path from the light path reflected by the first specular reflection plate (11) to the fourth specular reflection plate (14). To each of the optical paths of
Low-magnification wide-view binoculars characterized in that an objective lens (20) is arranged so as to be orthogonal to the optical axis of the optical path. 7. A first specular reflector (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflector (11), A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). An eyepiece lens is placed behind the light exit side of the reflection reversal optical system on the eyepiece side, and each of these specular reflectors (11, 12, 13, 14) is formed as a reflector whose surface is a mirror surface, and The mirror surface is covered with a corrosion- and moisture-proof protective thin film, and the objective lens (20) is placed in the middle of the first and second specular reflection plates (11, 12). (11) low magnification wide field of view binoculars, characterized in that interposed arranged orthogonal to the reflection optical axis by. 8. A first specular reflection plate (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflecting plate (11). A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs the light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). The eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and each of the specular reflectors (11, 12, 13, 14) is integrally structured by a housing supporting them, Any of the optical paths between the optical path reflected by the first specular reflector (11) and the optical path reaching the fourth specular reflector (14) should be directly aligned with the optical axis of the optical path. Crossed objective lens (20)
Low-magnification wide-field-of-view binoculars characterized by interposing. 9. A first specular reflection plate (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflecting plate (11). A second light directing light in a direction orthogonal to the light on the incident optical axis;
And a mirror-reflecting plate (12) for forming an objective-side reflection / reversal optical system, which further reflects the light reflected by the second specular-reflecting plate (12), and also the second specular-reflecting plate (12). A third specular reflector (13) that reflects in a direction parallel to the light incident on the optical axis and is reflected by the third specular reflector (13) An eyepiece side reflection reversal optical system is constructed with a fourth specular reflector (14) that directs light on the optical axis in a direction parallel to the incident optical axis to the first specular reflector (11). The eyepiece lens is arranged behind the light exit side of the reflection reversal optical system on the eyepiece side, and each of the specular reflectors (11, 12, 13, 14) is integrally structured by a housing supporting them, First and second specular reflectors (11,12)
In the middle of the, the objective lens (20) and the first specular reflector (11)
Binoculars with low magnification and wide field of view, which are arranged so as to be orthogonal to the optical axis reflected by. 10. A first specular reflection plate (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects the incident light reflected by the first specular reflecting plate (11). A second mirror-reflecting plate (12) for directing light in a direction orthogonal to the light on the incident optical axis constitutes a reflection reversal optical system on the objective side, and further a second mirror-reflecting plate (12). And a third specular reflector (13) that reflects the reflected light from the third specular reflector (13) and reversely reflects it in a direction parallel to the light on the optical axis incident on the second specular reflector (12). The fourth specular reflector (13) that receives and reflects the light reflected by the specular reflector (13) and directs the light on its central optical axis in a direction parallel to the incident optical axis with respect to the first specular reflector (11). 14) together with the eyepiece side reflection reversal optical system, and the eyepiece rear side of the light emission side of this reflection reversal optical system. Place the lens, fourth specular reflector from the reflected light path of the first specular reflector (11) (14)
The objective lens (20) is interposed in any one of the respective optical paths between the optical paths reaching the optical path to reach the fourth specular reflection plate.
Low-magnification wide-view binoculars characterized by incorporating a condenser lens as an intermediate lens (15) close to the light exit end side of (14). 11. A first specular reflector (11) arranged on the object side with an inclination of 45 ° with respect to the incident optical axis, and receives and reflects incident light reflected by the first specular reflector (11), A second mirror-reflecting plate (12) for directing light in a direction orthogonal to the light on the incident optical axis constitutes a reflection reversal optical system on the objective side, and further a second mirror-reflecting plate (12). And a third specular reflector (13) that reflects the reflected light from the third specular reflector (13) and reversely reflects it in a direction parallel to the light on the optical axis incident on the second specular reflector (12). The fourth specular reflector (13) that receives and reflects the light reflected by the specular reflector (13) and directs the light on its central optical axis in a direction parallel to the incident optical axis with respect to the first specular reflector (11). 14) together with the eyepiece side reflection reversal optical system, and the eyepiece rear side of the light emission side of this reflection reversal optical system. Place the lens, first and second
The objective lens (20) is interposed in the middle of the specular reflectors (11, 12) perpendicular to the optical axis reflected by the first specular reflector (11), and the light of the fourth specular reflector (14) is Low-magnification wide-view binoculars characterized by incorporating a condenser lens as an intermediate lens (15) close to the exit end side.