Prismatic reversed image sight for pistols

Abstract

The utility model is suitable for the technical field of sighting telescope, provides a prism reverse image sighting telescope for pistol, including mirror body and optical system, the optical system is located mirror body inside, the optical system includes the objective group, reverse image lens group and eyepiece group of same optical axis setting, the objective group is the cemented lens including objective first lens and objective second lens, the reverse image prism group includes ridge prism, half five prism and is equipped with the aperture diaphragm between ridge prism and half five prism, the prism optical axis alignment between the light transmission hole of aperture diaphragm and ridge prism, half five prism, the eyepiece group includes eyepiece first lens, eyepiece second lens and eyepiece third lens, the eyepiece first lens is combined as cemented lens with eyepiece second lens, the optical total length range of optical system is 50mm~55mm, the field of view angle range is 2°~4°, the range of exit pupil distance is 300mm~400mm, and the exit pupil diameter range is 14mm~16mm.

Description

Technical Field

[0001] This utility model belongs to the field of aiming device technology, and in particular relates to a prism inverted image aiming scope for a pistol. Background Technology

[0002] Red dot sights are often equipped on pistols to assist shooters in aiming due to their small size, no exit pupil distance, and ability to be quickly aimed with both eyes. However, in certain situations, such as when the target is outside the corrected distance of the red dot sight, the parallax of red dot sights used on pistols cannot meet the shooter's requirements for higher accuracy. Among the many types of sights, telescopic sights achieve high accuracy because the reticle pattern coincides with the image-side focal plane of the objective lens, resulting in very small parallax when aiming at distant targets. However, telescopic sights currently on the market are large, have short exit pupil distances, and are limited to monocular aiming. They are often equipped on sniper rifles or other rifles for long-range shooting and cannot be used on pistols. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a pistol prism inverted image sight that is small in size, has a long exit pupil distance, allows for rapid aiming with both eyes, and meets the requirements of high accuracy.

[0004] This invention is implemented as follows: A prism-type image-reversing sight for a pistol includes a scope body and an optical system. The optical system is located inside the scope body and includes an objective lens group, an eyepiece group, and an image-reversing lens group arranged coaxially. The objective lens group includes a cemented lens composed of a first objective lens and a second objective lens. The first objective lens is a negative meniscus lens, and the second objective lens is a biconvex lens. The eyepiece group includes a first eyepiece lens, a second eyepiece lens, and a third eyepiece lens. The first and second eyepiece lenses are combined to form a cemented lens. The first eyepiece lens is a biconcave lens, the second eyepiece lens is a biconvex lens, and the third eyepiece lens is a biconvex lens. The inverted image prism group includes a roof prism, a semi-pentagonal prism, and an aperture stop disposed between the roof prism and the semi-pentagonal prism. The aperture of the aperture stop is aligned with the optical axis of the prism between the roof prism and the semi-pentagonal prism. The total optical length of the optical system ranges from 50mm to 55mm, the field of view ranges from 2° to 4°, the exit pupil distance ranges from 300mm to 400mm, and the exit pupil diameter ranges from 14mm to 16mm.

[0005] In one optional embodiment, the total optical length of the optical system is 55 mm, the field of view is 3°, the exit pupil distance is 400 mm, and the exit pupil diameter is 15 mm.

[0006] In an optional embodiment, the light-transmitting aperture is a circular hole with a diameter of 2.3 mm. The geometric center of the light-transmitting aperture coincides with the optical axis of the prism between the roof prism and the semi-pentagonal prism. The distance between the exit surface of the roof prism and the incident surface of the semi-pentagonal prism is 2.6 mm. The distance between the aperture stop and the exit surface of the roof prism is 0.61 mm.

[0007] In one optional embodiment, the distance between the center of the right end face of the second objective lens and the left end face of the roof prism is 5.74 mm, and the distance between the center of the right end face of the semi-pentagonal prism and the center of the left end face of the first eyepiece lens is 10.5 mm.

[0008] In one optional embodiment, the objective lens group has an outline diameter of 16 mm, and the center thicknesses of the first objective lens and the second objective lens are 1.4 mm and 1.6 mm, respectively.

[0009] In one optional embodiment, the profile diameter of the cemented lens composed of the first eyepiece lens and the second eyepiece lens is 14.5 mm, the profile diameter of the third eyepiece lens is 18 mm, and the center thicknesses of the first eyepiece lens, the second eyepiece lens, and the third eyepiece lens are 1.4 mm, 3.4 mm, and 3.1 mm, respectively.

[0010] In one optional embodiment, the distance between the center of the right end face of the second eyepiece and the center of the left end face of the third eyepiece is 7.6 mm.

[0011] In an alternative embodiment, the scope body further includes a clamping portion for clamping an adapter base plate connected to the pistol.

[0012] In an optional embodiment, the clamping part includes a slot adapted to the adapter base plate and a pressure block for fixing the slot to the adapter base plate.

[0013] In one optional embodiment, the slot is a dovetail groove, the adapter base plate is provided with a dovetail guide rail adapted to the dovetail groove, the upper surface of the slot is provided with a limiting protrusion, and the dovetail guide rail is provided with a limiting groove adapted to the limiting protrusion.

[0014] This utility model has at least the following beneficial effects:

[0015] In existing technologies, scopes used on pistols are typically small dot sights, including red dot and green dot sights. This facilitates the shooter's movement. However, when the target exceeds the calibrated distance, the parallax of the dot sight on a pistol gradually increases with distance, leading to a decrease in the shooter's aiming accuracy. Compared to existing technologies, this invention provides a prism-type image-reversing sight for pistols, employing a telescopic optical system. The image-side focal plane of its objective lens group coincides with the incident surface of a semi-pentagonal prism. This incident surface is provided with a reticle pattern, and the target object is imaged on this incident surface, thus achieving aiming. This is suitable for aiming dot sights on pistols. The scope corrects targets beyond the correct distance and achieves a long exit pupil effect by placing an aperture stop between the roof prism and the semi-pentagonal prism. The light-transmitting hole on the aperture stop is close to the entrance pupil. At the same time, the use of the roof prism and the semi-pentagonal prism to orthogonalize the image can effectively reduce the number of lenses and further shorten the overall length of the optical system, compressing the overall optical length of the entire optical system to 50mm~55mm. This significantly reduces the size and weight of the scope, allowing users to mount the scope with this optical system on a pistol. The exit pupil diameter reaches 15mm, which is beneficial for the shooter to aim with both eyes during operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the mirror body and the clamping part in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the optical system in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the adapter base plate connected to the clamping part in one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 111, Optical system; 1, Lens body; 2, First objective lens; 3, Second objective lens; 4, Roof prism; 4a, Exit surface; 5, Semi-pentagonal prism; 5a, Incident surface; 6, Aperture stop; 61, Light aperture; 7, First eyepiece lens; 8, Second eyepiece lens; 9, Third eyepiece lens; 10, Clamping part; 11, Slot; 11a, Limiting protrusion; 12, Pressure block; 12a, Fastener; 13, Adapter base plate; 14, Dovetail guide rail; 14a, Limiting groove. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] Please see Figure 1 , Figure 2 and Figure 3 This embodiment of a pistol prism inverted image sight includes a scope body 1 and an optical system 111 having an objective lens group, an inverted image prism group, and an eyepiece group. The objective lens group, the inverted image prism group, and the eyepiece group are arranged on the same optical axis. The optical system 111 is arranged inside the scope body 1. The target object in the field of view generates an inverted visible light image through the objective lens group. The inverted image prism group converts the inverted visible light image into an upright image without changing the left and right direction of the visible light image. The upright visible light image is then incident on the human eye after passing through the eyepiece group.

[0023] In this embodiment, the objective lens group includes a first objective lens 2 and a second objective lens 3.

[0024] The objective lens group includes a cemented lens with a profile diameter of 16 mm. The cemented lens includes a first objective lens 2 and a second objective lens 3. The first objective lens 2 is a negative meniscus lens with a center thickness of 1.4 mm and negative optical power. The second objective lens 3 is a biconvex lens with a center thickness of 1.6 mm and positive optical power. The cemented lens composed of positive and negative lenses helps to eliminate spherical aberration and improve optical imaging quality.

[0025] In this embodiment, the eyepiece assembly includes a first eyepiece lens 7, a second eyepiece lens 8, and a third eyepiece lens 9. The first eyepiece lens 7 is a biconcave lens with negative optical power; the second eyepiece lens 8 is a biconvex lens with positive optical power; and the third eyepiece lens 9 is a biconvex lens with positive optical power. The center thickness of the first eyepiece lens 7 is 1.4 mm, the center thickness of the second eyepiece lens 8 is 3.4 mm, and the center thickness of the third eyepiece lens 9 is 3.1 mm. The first eyepiece lens 7 and the second eyepiece lens 8 are combined to form a cemented lens with a profile diameter of 14.5 mm, and the distance between the center of the right end face of the second eyepiece lens 8 and the center of the left end face of the third eyepiece lens 9 is 7.6 mm. The eyepiece assembly employs a cemented lens and a single-lens structure, which is beneficial for correcting image aberrations and improving the imaging quality of the optical system.

[0026] In this embodiment, the inverted image prism group includes a roof prism 4, a semi-pentagonal prism 5, and an aperture stop 6;

[0027] There is a gap between the ridge prism 4 and the semi-pentagonal prism 5. Specifically, the shortest distance between the exit surface 4a of the ridge prism 4 and the incident surface 5a of the semi-pentagonal prism 5 is 2.6 mm. The aperture stop 6 has a light-transmitting hole 61 with a diameter of 2.3 mm and is located between the ridge prism 4 and the semi-pentagonal prism 5. Light is emitted from the ridge prism 4 and shines into the light-transmitting hole 61. The incident surface 5a of the semi-pentagonal prism 5 has a reticle pattern (not shown in the figure). Common shapes of the reticle pattern can be "dots", "cross lines", etc.

[0028] In this embodiment, the image-side focal plane of the objective lens group coincides with the incident surface 5a, meaning the visible light image formed by the target object coincides with the reticle pattern, thereby achieving the aiming effect. In this embodiment, the geometric center line of the light-transmitting aperture 61 coincides with the prism optical axis of the roof prism 4 and the semi-pentagonal prism 5, and the shortest distance from the light-transmitting aperture 61 of the aperture stop 6 to the exit surface 4a of the roof prism 4 is 0.61 mm. Since the smaller the distance between the light-transmitting aperture 61 and the roof prism 4, the shorter the entrance pupil distance from the light-transmitting aperture 61 to the optical system 111, the longer the exit pupil distance.

[0029] To make the scope more compact without affecting its optical imaging of the target, the distance between the objective lens group, the inverted prism group, and the eyepiece group in the optical system provided by this invention is obtained through rigorous calculation.

[0030] The objective lens group and the inverted image lens group are spaced apart, specifically, the distance between the center of the right end face of the second objective lens 3 and the left end face of the roof prism 4 is 5.74 mm. The inverted image lens group and the eyepiece group are also spaced apart, specifically, the distance between the center of the right end face of the semi-pentagonal prism 5 and the center of the left end face of the first eyepiece lens 7 is 10.5 mm. The total optical length of the optical system 111 ranges from 50 mm to 55 mm. In this embodiment, the total optical length of the optical system 111 is 55 mm, which greatly reduces the size of the sight. Users can easily mount the scope onto the pistol. The exit pupil distance ranges from 300mm to 400mm, and in this embodiment, the exit pupil distance is 400mm. The exit pupil diameter ranges from 14mm to 16mm, and in this embodiment, the exit pupil diameter is 15mm. This allows the user to maintain their original shooting posture after mounting the scope, while also allowing the user to aim with both eyes. Adjusting the distance between the entire eyepiece assembly and the inverted prism assembly can achieve an eyepiece diopter adjustment range of ≥2D. Moving the entire eyepiece assembly back by 3.0342mm corresponds to a diopter adjustment of 2D.

[0031] Please see Figure 1 and Figure 3The scope body 1 also includes a clamping part 10, which includes a slot 11 adapted to the adapter base plate 13 and a pressure block 12 for fixing the slot 11 and the adapter base plate 13, wherein the adapter base plate 13 is connected to a part of the pistol. In some embodiments, the slot 11 is a dovetail groove, and the side of the slot 11 is provided with an adjustable pressure block 12. When the user needs to install the scope on the pistol, the slot 11 is aligned with and engaged with the dovetail guide rail 14 on the adapter base plate 13, the pressure block 12 is moved toward the dovetail guide rail 14, and finally the pressure block 12 and the dovetail guide rail 14 are fixedly connected by fasteners 12a to restrict the freedom of the scope in the first direction. In some embodiments, the fastener 12a is a screw that passes through the pressure block 12 and connects to the scope body 1. After the user inserts the slot 11 into the dovetail rail 14, they tighten the screw, causing the pressure block 12 to move closer to the scope body 1 until it is pressed against the dovetail rail 14, thus connecting the scope to the pistol. Similarly, when the user needs to remove the scope from the adapter plate 13, they can loosen the screw in the opposite direction to move the pressure block 12 away from the dovetail rail 14, and then the scope can be separated from the dovetail rail 14. To prevent the scope from sliding due to impact during pistol firing, the upper surface of the slot 11 is also provided with a limiting protrusion 11a that matches the limiting groove 14a on the dovetail rail 14. The cooperation between the limiting protrusion 11a and the limiting groove 14a further restricts the scope's degree of freedom in the second direction, effectively limiting the position of the scope on the adapter plate 13. The first direction is perpendicular to the length direction of the dovetail guide rail 14, and the second direction is parallel to the length direction of the dovetail guide rail 14.

[0032] The above are merely preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. They should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present invention.

Claims

1. A prism reversed image sight for a handgun, comprising a sight body (1) and an optical system (111), characterized in that, The optical system (111) is located inside the mirror body (1). The optical system (111) includes an objective lens group, an eyepiece group, and an inverted prism group arranged coaxially. The objective lens group includes a cemented lens composed of an objective first lens (2) and an objective second lens (3). The objective first lens (2) is a negative meniscus lens, and the objective second lens (3) is a biconvex lens. The eyepiece group includes an eyepiece first lens (7), an eyepiece second lens (8), and an eyepiece third lens (9). The eyepiece first lens (7) and the eyepiece second lens (8) are combined to form a cemented lens. The eyepiece first lens (7) is a biconcave lens. The second eyepiece lens (8) is a biconvex lens, the third eyepiece lens (9) is a biconvex lens, the inverted image prism group includes a roof prism (4), a half pentaprism (5) and an aperture stop (6) disposed between the roof prism (4) and the half pentaprism (5). The light-passing hole (61) of the aperture stop (6) is aligned with the optical axis of the prism between the roof prism (4) and the half pentaprism (5). The total optical length of the optical system (111) is 50mm~55mm, the field of view is 2°~4°, the exit pupil distance is 300mm~400mm, and the exit pupil diameter is 14mm~16mm.

2. The prism image-reversing sight for a pistol as described in claim 1, characterized in that, The optical system (111) has a total optical length of 55 mm, a field of view of 3°, an exit pupil distance of 400 mm, and an exit pupil diameter of 15 mm.

3. The prism image-reversing sight for a pistol as described in claim 2, characterized in that, The light-transmitting hole (61) is a circular hole with a diameter of 2.3 mm. The geometric center of the light-transmitting hole (61) coincides with the prism optical axis between the roof prism (4) and the semi-pentagonal prism (5). The distance between the exit surface (4a) of the roof prism and the incident surface (5a) of the semi-pentagonal prism is 2.6 mm. The distance between the aperture stop (6) and the exit surface (4a) of the roof prism (4) is 0.61 mm.

4. The prism image-reversing sight for a pistol as described in claim 3, characterized in that, The distance between the center of the right end face of the objective lens (3) and the left end face of the roof prism (4) is 5.74 mm, and the distance between the center of the right end face of the semi-pentagonal prism (5) and the center of the left end face of the eyepiece lens (7) is 10.5 mm.

5. The prism image-reversing sight for a pistol as described in claim 4, characterized in that, The objective lens group has an outline diameter of 16mm, and the center thicknesses of the first objective lens (2) and the second objective lens (3) are 1.4mm and 1.6mm, respectively.

6. The prism image-reversing sight for a pistol as described in claim 5, characterized in that, The outline diameter of the cemented lens composed of the first eyepiece lens (7) and the second eyepiece lens (8) is 14.5 mm, the outline diameter of the third eyepiece lens (9) is 18 mm, and the center thicknesses of the first eyepiece lens (7), the second eyepiece lens (8) and the third eyepiece lens (9) are 1.4 mm, 3.4 mm and 3.1 mm, respectively.

7. The prism image-reversing sight for a pistol as described in claim 6, characterized in that, The distance between the center of the right end face of the second eyepiece (8) and the center of the left end face of the third eyepiece (9) is 7.6 mm.

8. The prism image-reversing sight for a pistol as described in any one of claims 1-7, characterized in that, The lens body (1) also includes a clamping part (10) for clamping the adapter base plate (13) connected to the pistol.

9. The prism image-reversing sight for a pistol as described in claim 8, characterized in that, The clamping part (10) includes a slot (11) adapted to the adapter base plate (13) and a pressure block (12) for fixing the connection between the slot (11) and the adapter base plate (13).

10. The prism image-reversing sight for a pistol as described in claim 9, characterized in that, The slot (11) is a dovetail groove, and the adapter base plate (13) is provided with a dovetail guide rail adapted to the dovetail groove. The upper surface of the slot (11) is provided with a limiting protrusion (11a), and the dovetail guide rail is provided with a limiting groove (14a) adapted to the limiting protrusion (11a).

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