Large-aperture spotting scope optical system

Abstract

The invention belongs to the technical field of telescope manufacturing, and discloses a large-aperture spotting scope optical system which is characterized in that an objective lens first lens, an objective lens second lens, a Porro first prism, a Porro second prism, a semi-pentaprism, a reticle, an eyepiece first lens, an eyepiece second lens and an eyepiece third lens are sequentially arranged from the object side to the image side in the optical axis direction. According to the optical system, continuous zooming from 25 times to 75 times can be realized, and the imaging quality is good.

Description

Technical Field

[0001] The invention relates to the technical field of telescope manufacturing, in particular to a large-aperture target viewing telescope optical system. Background Art

[0002] Target scopes are optical instruments used for remote observation and are widely used in environmental and military fields. Especially in the field of field environment, although the target scopes used by operators can achieve high-magnification observation and aiming at the target, the image quality has certain defects, such as reduced image sharpness during use, obvious distortion of the image edge, and blurred image. When using the target scope with a digital camera to take bird photos, the quality of the photos after taking the photos is likely to be reduced. Summary of the invention

[0003] The purpose of the present invention is to provide a large-aperture target viewing scope optical system to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a large-aperture target viewing scope optical system, characterized in that: an objective lens first lens, an objective lens second lens, a Paul first prism, a Paul second prism, a half pentaprism, a graticule, an eyepiece first lens, an eyepiece second lens, an eyepiece third lens, an eyepiece fourth lens, an eyepiece fifth lens, an eyepiece sixth lens, and an eyepiece seventh lens are sequentially arranged from the object side to the image side along the optical axis direction; The first lens of the objective lens is a biconvex lens, the second lens of the objective lens is a concave-convex lens with the concave surface facing the object side, the first lens of the eyepiece and the second lens of the eyepiece form a cemented lens, the first lens of the eyepiece is a concave-convex lens with the concave surface facing the object side, the second lens of the eyepiece is a biconcave lens, the third lens of the eyepiece and the fourth lens of the eyepiece form a cemented lens, the third lens of the eyepiece is a plano-concave lens with the concave surface facing the image side, the fourth lens of the eyepiece is a biconvex lens, the fifth lens of the eyepiece is a biconvex lens, the sixth lens of the eyepiece and the seventh lens of the eyepiece form a cemented lens, the sixth lens of the eyepiece is a biconvex lens, and the seventh lens of the eyepiece is a biconcave lens. In the optical system, only the above 9 lenses have optical focal length.

[0005] As a preferred technical solution, the object side curvature radius of the first lens of the objective lens is 297.3mm, the image side curvature radius is 297.3mm, the center thickness is 12.5mm, the material is glass H-FK61, and the outline diameter is 107mm; the object side curvature radius of the second lens of the objective lens is -282.8mm, the image side curvature radius is 888.9mm, the center thickness is 6mm, the material is glass H-TF5, and the outline diameter is 107mm; The object side curvature radius of the first lens of the eyepiece is -27.27mm, the image side curvature radius is 12.52mm, the center thickness is 4.8mm, the material is glass H-ZF4, and the outline diameter is 19mm; the object side curvature radius of the second lens of the eyepiece is -12.52mm, the image side curvature radius is -27.27mm, the center thickness is 1.6mm, the material is glass H-ZK9, and the outline diameter is 19mm; the object side of the third lens of the eyepiece is flat, the image side curvature radius is -34.26mm, the center thickness is 2.4mm, the material is glass H-ZF2, and the outline diameter is 32mm; the object side curvature radius of the fourth lens of the eyepiece is 34.26mm, the image side curvature radius is 34.26mm, and the center thickness is 10.5mm, The material used is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the fifth lens of the eyepiece is 58.8mm, the image side curvature radius is 58.8mm, the center thickness is 7.5mm, and the material used is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the sixth lens of the eyepiece is 30.6mm, the image side curvature radius is 30.6mm, the center thickness is 8mm, and the material used is glass H-ZK9, and the outline diameter is 28mm; the object side curvature radius of the seventh lens of the eyepiece is -30.6mm, the image side curvature radius is -305.4mm, the center thickness is 2.1mm, and the material used is glass H-ZF4, and the outline diameter is 28mm, where a positive radius of curvature indicates a convex surface, and a negative radius of curvature indicates a concave surface.

[0006] As a preferred technical solution, the distance between the first lens and the second lens of the objective lens along the optical axis is 4.45mm, the distance between the second lens of the objective lens and the first Pau prism is 408.5mm, the distance between the first Pau prism and the second Pau prism is 6mm, the distance between the second Pau prism and the half pentaprism is 12mm, the distance between the half pentaprism and the graticule is 2mm, the distance between the graticule and the first lens of the eyepiece is 9.9-19mm, the distance between the second lens of the eyepiece and the third lens of the eyepiece is 11.76-49.35mm, the distance between the fourth lens of the eyepiece and the fifth lens of the eyepiece is 0.3mm, and the distance between the fifth lens of the eyepiece and the sixth lens of the eyepiece is 2.02-30.42mm.

[0007] Compared with the prior art, the beneficial effects achieved by the present invention are: The magnification of the telescope optical system of the present application can be continuously changed from 25 times to 75 times. The first objective lens and the second objective lens constitute an objective lens group. The focal length of the objective lens group is 560.1mm, and the minimum focusing distance is 8.5m. When the magnification is 25 times, the focal length of the eyepiece is 22.7mm, the field of view of the whole machine is 1.57°, the exit pupil diameter is 4.25mm, the exit pupil distance is 19.7mm, the twilight index is 50.93, and the relative brightness is 18.06.

[0008] When the magnification is 75x, the focal length of the eyepiece is 7.6mm, the field of view of the whole machine is 0.88°, the exit pupil diameter is 1.42mm, the exit pupil distance is 17.7mm, the twilight index is 87.97, and the relative brightness is 2.02. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a schematic diagram of an optical system of the present invention; Figure 2 This is a field curvature distortion diagram of the present invention with a magnification of 25 times; Figure 3 It is a spot diagram of the present invention with a magnification of 25 times; Figure 4 It is a grid distortion diagram of the present invention with a magnification of 25 times; Figure 5 This is a field curvature distortion diagram of the present invention with a magnification of 75 times; Figure 6 It is a spot diagram of the present invention with a magnification of 75 times; Figure 7 This is a grid distortion diagram of the present invention with a magnification of 75 times. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0011] As attached Figure 1-4 As shown, the present invention provides the following technical solutions: a large-aperture target viewing scope optical system, characterized in that: an objective lens first lens 1, an objective lens second lens 2, a Paul first prism 3, a Paul second prism 4, a semi-pentaprism 5, a graticule 6, an eyepiece first lens 7, an eyepiece second lens 8, an eyepiece third lens 9, an eyepiece fourth lens 10, an eyepiece fifth lens 11, an eyepiece sixth lens 12, and an eyepiece seventh lens 13 are sequentially arranged along the optical axis from the object side to the image side; The first lens 1 of the objective lens is a biconvex lens, the second lens 2 of the objective lens is a concave-convex lens with the concave surface facing the object side, the first lens 7 of the eyepiece and the second lens 8 of the eyepiece form a cemented lens, the first lens 7 of the eyepiece is a concave-convex lens with the concave surface facing the object side, the second lens 8 of the eyepiece is a biconcave lens, the third lens 9 of the eyepiece and the fourth lens 10 of the eyepiece form a cemented lens, the third lens 9 of the eyepiece is a plano-concave lens with the concave surface facing the image side, the fourth lens 10 of the eyepiece is a biconvex lens, the fifth lens 11 of the eyepiece is a biconvex lens, the sixth lens 12 of the eyepiece and the seventh lens 13 of the eyepiece form a cemented lens, the sixth lens 12 of the eyepiece is a biconvex lens, and the seventh lens 13 of the eyepiece is a biconcave lens. In the optical system, only the above 9 lenses have optical power.

[0012] The first lens 1 of the objective lens has an object side curvature radius of 297.3 mm, an image side curvature radius of 297.3 mm, a center thickness of 12.5 mm, is made of glass H-FK61, and has a profile diameter of 107 mm; the second lens 2 of the objective lens has an object side curvature radius of -282.8 mm, an image side curvature radius of 888.9 mm, a center thickness of 6 mm, is made of glass H-TF5, and has a profile diameter of 107 mm; The object side curvature radius of the first lens 7 of the eyepiece is -27.27mm, the image side curvature radius is 12.52mm, the center thickness is 4.8mm, the material is glass H-ZF4, and the outline diameter is 19mm; the object side curvature radius of the second lens 8 of the eyepiece is -12.52mm, the image side curvature radius is -27.27mm, the center thickness is 1.6mm, the material is glass H-ZK9, and the outline diameter is 19mm; the object side of the third lens 9 of the eyepiece is flat, the image side curvature radius is -34.26mm, the center thickness is 2.4mm, the material is glass H-ZF2, and the outline diameter is 32mm; the object side curvature radius of the fourth lens 10 of the eyepiece is 34.26mm, the image side curvature radius is 34.26mm, and the center thickness is 10.5mm, The material used is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the eyepiece fifth lens 11 is 58.8mm, the image side curvature radius is 58.8mm, the center thickness is 7.5mm, and the material used is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the eyepiece sixth lens 12 is 30.6mm, the image side curvature radius is 30.6mm, the center thickness is 8mm, and the material used is glass H-ZK9, and the outline diameter is 28mm; the object side curvature radius of the eyepiece seventh lens 13 is -30.6mm, the image side curvature radius is -305.4mm, the center thickness is 2.1mm, and the material used is glass H-ZF4, and the outline diameter is 28mm, where a positive radius of curvature indicates a convex surface, and a negative radius of curvature indicates a concave surface.

[0013] Along the optical axis direction, the distance between the objective first lens 1 and the objective second lens 2 is 4.45mm, the distance between the objective second lens 2 and the Pau first prism 3 is 408.5mm, the distance between the Pau first prism 3 and the Pau second prism 4 is 6mm, the distance between the Pau second prism 4 and the half pentaprism 5 is 12mm, the distance between the half pentaprism 5 and the graticule 6 is 2mm, the distance between the graticule 6 and the eyepiece first lens 7 is 19mm, the distance between the eyepiece second lens 8 and the eyepiece third lens 9 is 11.76mm, the distance between the eyepiece fourth lens 10 and the eyepiece fifth lens 11 is 0.3mm, and the distance between the eyepiece fifth lens 11 and the eyepiece sixth lens 12 is 30.42mm.

[0014] The above parameters correspond to an optical system magnification of 25 times, an eyepiece focal length of 22.7mm, a field of view of 1.57°, an exit pupil diameter of 4.25mm, an exit pupil distance of 19.7mm, a twilight index of 50.93, and a relative brightness of 18.06. Example

[0015] As attached Figure 1 , Figure 5-7 As shown, the present invention provides the following technical solutions: a large-aperture target viewing scope optical system, characterized in that: an objective lens first lens 1, an objective lens second lens 2, a Paul first prism 3, a Paul second prism 4, a semi-pentaprism 5, a graticule 6, an eyepiece first lens 7, an eyepiece second lens 8, an eyepiece third lens 9, an eyepiece fourth lens 10, an eyepiece fifth lens 11, an eyepiece sixth lens 12, and an eyepiece seventh lens 13 are sequentially arranged along the optical axis from the object side to the image side; The first lens 1 of the objective lens is a biconvex lens, the second lens 2 of the objective lens is a concave-convex lens with the concave surface facing the object side, the first lens 7 of the eyepiece and the second lens 8 of the eyepiece form a cemented lens, the first lens 7 of the eyepiece is a concave-convex lens with the concave surface facing the object side, the second lens 8 of the eyepiece is a biconcave lens, the third lens 9 of the eyepiece and the fourth lens 10 of the eyepiece form a cemented lens, the third lens 9 of the eyepiece is a plano-concave lens with the concave surface facing the image side, the fourth lens 10 of the eyepiece is a biconvex lens, the fifth lens 11 of the eyepiece is a biconvex lens, the sixth lens 12 of the eyepiece and the seventh lens 13 of the eyepiece form a cemented lens, the sixth lens 12 of the eyepiece is a biconvex lens, and the seventh lens 13 of the eyepiece is a biconcave lens. In the optical system, only the above 9 lenses have optical power.

[0016] As a preferred technical solution, the object side curvature radius of the first lens 1 of the objective lens is 297.3mm, the image side curvature radius is 297.3mm, the center thickness is 12.5mm, the material is glass H-FK61, and the outline diameter is 107mm; the object side curvature radius of the second lens 2 of the objective lens is -282.8mm, the image side curvature radius is 888.9mm, the center thickness is 6mm, the material is glass H-TF5, and the outline diameter is 107mm; The first lens 7 of the eyepiece has a curvature radius of -27.27mm on the object side, a curvature radius of 12.52mm on the image side, a center thickness of 4.8mm, a material of glass H-ZF4, and a profile diameter of 19mm; the second lens 8 of the eyepiece has a curvature radius of -12.52mm on the object side, a curvature radius of -27.27mm on the image side, a center thickness of 1.6mm, a material of glass H-ZK9, and a profile diameter of 19mm; the third lens 9 of the eyepiece has a flat object side, a curvature radius of -34.26mm on the image side, a center thickness of 2.4mm, a material of glass H-ZF2, and a profile diameter of 32mm; the fourth lens 10 of the eyepiece has a curvature radius of 34.26mm on the object side, and a curvature radius of 34.26mm on the image side , the center thickness is 10.5mm, the material is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the eyepiece fifth lens 11 is 58.8mm, the image side curvature radius is 58.8mm, the center thickness is 7.5mm, the material is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the eyepiece sixth lens 12 is 30.6mm, the image side curvature radius is 30.6mm, the center thickness is 8mm, the material is glass H-ZK9, and the outline diameter is 28mm; the object side curvature radius of the eyepiece seventh lens 13 is -30.6mm, the image side curvature radius is -305.4mm, the center thickness is 2.1mm, the material is glass H-ZF4, and the outline diameter is 28mm.

[0017] As a preferred technical solution, the distance between the first lens 1 and the second lens 2 of the objective lens along the optical axis is 4.45 mm, the distance between the second lens 2 and the first Pau prism 3 is 408.5 mm, the distance between the first Pau prism 3 and the second Pau prism 4 is 6 mm, the distance between the second Pau prism 4 and the half pentaprism 5 is 12 mm, the distance between the half pentaprism 5 and the graticule 6 is 2 mm, the distance between the graticule 6 and the first lens 7 of the eyepiece is 9.9 mm, the distance between the second lens 8 and the third lens 9 of the eyepiece is 49.35 mm, the distance between the fourth lens 10 and the fifth lens 11 of the eyepiece is 0.3 mm, and the distance between the fifth lens 11 and the sixth lens 12 of the eyepiece is 2.02 mm.

[0018] The above parameters correspond to an optical system magnification of 75 times, a focal length of the eyepiece of 7.6mm, a field of view of 0.88°, an exit pupil diameter of 1.42mm, an exit pupil distance of 17.7mm, a twilight index of 87.97, and a relative brightness of 2.02.

[0019] During the process of adjusting the telescope optical system from 25 times to 75 times, the cemented lens composed of the first lens of the eyepiece and the second lens of the eyepiece moves toward the object side, and the third lens of the eyepiece, the fourth lens of the eyepiece and the fifth lens of the eyepiece move toward the object side as a whole. In order to eliminate chromatic aberration, the present application coats ED film on the object side of the first lens of the objective lens and the second lens of the objective lens.

[0020] Attached Figure 2 And attached Figure 5 It is the 25x and 75x field curvature distortion diagram of this application. Field curvature distortion diagram analysis is an important tool for evaluating the imaging quality of optical systems. It reveals the influence of field curvature and distortion on imaging effects, also known as field curvature. It describes that after a planar object passes through a lens system, the clear image points formed are not on a plane, but on a curved surface. The distortion reflects the similarity between the object and the image, including types such as barrel distortion and pincushion distortion.

[0021] We attach Figure 2 It can be seen that when the telescope optical system magnification is 25 times, Figure 2 In the field curvature curve, the wavelength is 0.486um, 0.588um, 0.656um, S represents the arc vector, T represents the meridian quantity, from the field curvature curve we can see that the field curvature of this application is very small, the edge and the center are relatively clear, the image quality is good, and the maximum field of view is 1.57°; we can see from the attached Figure 5 It can be seen that when the telescope optical system magnification is 75 times, Figure 5 In the field curvature curve, the wavelengths are 0.486um, 0.588um, and 0.656um, S represents the arc vector, and T represents the meridian quantity. From the field curvature curve, we can see that the field curvature of this application is very small, the edges and the center are relatively clear, the image quality is good, and the maximum field of view is 0.88°; it is not difficult to find that the field of view is constantly shrinking in the process of magnification from 25 to 75.

[0022] Attached Figure 3 And attached Figure 6 It is the spot diagram of this application. The distribution of points in the spot diagram should be uniform and dense, without obvious abnormal values ​​or outliers. The more evenly distributed the data is, the more stable the imaging quality is. The energy of the optical system spot diagram in this application is relatively concentrated, and the imaging is relatively clear. Figure 3 and Figure 6By comparison, it is not difficult to find that when the magnification is 75 times, the image quality is reduced, especially when the field of view is the maximum field of view of 0.88°, the points are arranged in a narrow elliptical distribution.

[0023] Attached Figure 4 and attached Figure 7 is the grid distortion map of this application, Figure 4 As shown in the figure, the maximum distortion at the edge of the image plane is 2% at a magnification of 25 times; Figure 7 As shown in the figure, the maximum distortion at the edge of the image plane is 13% at a magnification of 75 times. Figure 4 and attached Figure 7 It is not difficult to find that there is almost no distortion at the edge of the image at a magnification of 25 times, but when the magnification reaches 75 times, the distortion at the edge of the image will be very obvious.

[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A large-aperture target viewing mirror optical system, characterized in that: An objective lens first lens (1), an objective lens second lens (2), a Paul first prism (3), a Paul second prism (4), a semi-pentaprism (5), a graticule (6), an eyepiece first lens (7), an eyepiece second lens (8), an eyepiece third lens (9), an eyepiece fourth lens (10), an eyepiece fifth lens (11), an eyepiece sixth lens (12), and an eyepiece seventh lens (13) are sequentially arranged along the optical axis from the object side to the image side; The first lens (1) of the objective lens is a biconvex lens, the second lens (2) of the objective lens is a concave-convex lens, with the concave surface facing the object side, the first lens (7) of the eyepiece and the second lens (8) of the eyepiece form a cemented lens, the first lens (7) of the eyepiece is a concave-convex lens, with the concave surface facing the object side, the second lens (8) of the eyepiece is a biconcave lens, the third lens (9) of the eyepiece and the fourth lens (10) of the eyepiece form a cemented lens, the third lens (9) of the eyepiece is a plano-concave lens, with the concave surface facing the image side, the fourth lens (10) of the eyepiece is a biconvex lens, the fifth lens (11) of the eyepiece is a biconvex lens, the sixth lens (12) of the eyepiece and the seventh lens (13) of the eyepiece form a cemented lens, the sixth lens (12) of the eyepiece is a biconvex lens, and the seventh lens (13) of the eyepiece is a biconcave lens, and the optical system has only the above 9 lenses having optical power.

2. The large-aperture target viewing scope optical system according to claim 1, characterized in that: The first lens (1) of the objective lens has an object side curvature radius of 297.3 mm, an image side curvature radius of 297.3 mm, a center thickness of 12.5 mm, is made of glass H-FK61, and has a profile diameter of 107 mm; the second lens (2) of the objective lens has an object side curvature radius of -282.8 mm, an image side curvature radius of 888.9 mm, a center thickness of 6 mm, is made of glass H-TF5, and has a profile diameter of 107 mm; The first lens (7) of the eyepiece has a curvature radius of -27.27 mm on the object side, a curvature radius of 12.52 mm on the image side, a center thickness of 4.8 mm, and is made of glass H-ZF4 with a profile diameter of 19 mm; the second lens (8) of the eyepiece has a curvature radius of -12.52 mm on the object side, a curvature radius of -27.27 mm on the image side, a center thickness of 1.6 mm, and is made of glass H-ZK9 with a profile diameter of 19 mm; the third lens (9) of the eyepiece has a flat object side, a curvature radius of -34.26 mm on the image side, a center thickness of 2.4 mm, and is made of glass H-ZF2 with a profile diameter of 32 mm; the fourth lens (10) of the eyepiece has a curvature radius of 34.26 mm on the object side, a curvature radius of 34.26 mm on the image side, and a center thickness of 10.5 mm , the material is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the eyepiece fifth lens (11) is 58.8mm, the image side curvature radius is 58.8mm, the center thickness is 7.5mm, the material is glass H-ZK3, and the outline diameter is 32mm; the object side curvature radius of the eyepiece sixth lens (12) is 30.6mm, the image side curvature radius is 30.6mm, the center thickness is 8mm, the material is glass H-ZK9, and the outline diameter is 28mm; the object side curvature radius of the eyepiece seventh lens (13) is -30.6mm, the image side curvature radius is -305.4mm, the center thickness is 2.1mm, the material is glass H-ZF4, and the outline diameter is 28mm, wherein a positive number for the curvature radius indicates a convex surface, and a negative number for the curvature radius indicates a concave surface.

3. The large-aperture target viewing scope optical system according to claim 1, characterized in that: Along the optical axis direction, the distance between the objective lens first lens (1) and the objective lens second lens (2) is 4.45 mm, the distance between the objective lens second lens (2) and the Paul first prism (3) is 408.5 mm, the distance between the Paul first prism (3) and the Paul second prism (4) is 6 mm, the distance between the Paul second prism (4) and the half pentaprism (5) is 12 mm, the distance between the half pentaprism (5) and the graticule (6) is 2 mm, the distance between the graticule (6) and the eyepiece first lens (7) is 9.9-19 mm, the distance between the eyepiece second lens (8) and the eyepiece third lens (9) is 11.76-49.35 mm, the distance between the eyepiece fourth lens (10) and the eyepiece fifth lens (11) is 0.3 mm, and the distance between the eyepiece fifth lens (11) and the eyepiece sixth lens (12) is 2.02-30.42 mm.

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