A continuously variable zoom binocular optical system

Abstract

The present application belongs to the technical field of telescope manufacturing, and discloses a continuous zooming binocular telescope optical system, characterized in that: from the object side to the image side along the optical axis direction, an objective lens first lens, an objective lens second lens, a Paul first prism, a Paul second prism, an ocular lens first lens, an ocular lens second lens, an ocular lens third lens, an ocular lens fourth lens, an ocular lens fifth lens and an ocular lens sixth lens are sequentially arranged; the field of view is 4° when the zooming is 10 times, and the field of view is 2.66° when the zooming is 22 times.

Description

Technical Field

[0001] This invention relates to the field of telescope manufacturing technology, specifically to an optical system for a continuously variable magnification binoculars. Background Technology

[0002] In telescope optical systems, continuous zoom telescopes are relatively common products, but currently on the market, image blurring and a significant decrease in field of view can occur during continuous zooming. Summary of the Invention

[0003] The purpose of this invention is to provide a continuously zoom binoculars optical system with a magnification of 10 to 22 times and a clear field of view, in order to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a continuous zoom binoculars optical system, characterized in that: along the optical axis from the object side to the image side, there are arranged in sequence an objective lens, an objective lens, a second objective lens, a Porro prism, a second Porro prism, an eyepiece lens, an eyepiece lens, a third eyepiece, a fourth eyepiece, a fifth eyepiece, and a sixth eyepiece, and the optical system has only the above 8 lenses with optical power; The first and second objective lenses form a cemented lens. The first objective lens is a biconvex lens, and the second objective lens is a concave-convex lens with its concave surface facing the object side. The first and second eyepiece lenses form a cemented lens. The first eyepiece lens is a biconcave lens, and the second eyepiece lens is a concave-convex lens with its convex surface facing the object side. The third and fourth eyepiece lenses form a cemented lens. The third eyepiece lens is a plano-concave lens with its concave surface facing the image side. The fourth and fifth eyepiece lenses are biconvex lenses, and the sixth eyepiece lens is a plano-convex lens with its convex surface facing the object side. The first objective lens has an object-side radius of curvature of +92.87 mm, an image-side radius of curvature of +85.8 mm, a center thickness of 10.2 mm, and an outer diameter of 51 mm. It is made of H-K9L glass. The second objective lens has an object-side radius of curvature of -85.8 mm, an image-side radius of curvature of +627.6 mm, a center thickness of 3.8 mm, and an outer diameter of 51 mm. It is made of H-F4 glass. The first eyepiece lens has an object-side radius of curvature of -27.55 mm, an image-side radius of curvature of -12.408 mm, a center thickness of 1.6 mm, and an outer diameter of 16 mm. It is made of H-ZK9 glass. The second eyepiece lens has an object-side radius of curvature of +12.408 mm, an image-side radius of curvature of -27.55 mm, a center thickness of 4.3 mm, and an outer diameter of 16 mm. It is made of H-ZF7LA glass. The three lenses have a flat object side, an image-side radius of curvature of -27.44 mm, a center thickness of 2.2 mm, and an outer diameter of 26 mm. They are made of H-ZF7LA glass. The fourth eyepiece has an object-side radius of curvature of +27.44 mm and an image-side radius of curvature of +27.44 mm. It has a center thickness of 9.7 mm and an outer diameter of 26 mm. It is made of H-ZK9 glass. The fifth eyepiece has an object-side radius of curvature of +39.74 mm and an image-side radius of curvature of +106.9 mm. It has a center thickness of 5.3 mm and an outer diameter of 26 mm. It is made of H-ZK9 glass. The sixth eyepiece has an object-side radius of curvature of +33.03 mm, a flat image side, a center thickness of 3.8 mm, and an outer diameter of 26 mm. It is made of H-K9L glass. In the radius of curvature representation, "+" indicates a convex surface and "-" indicates a concave surface.

[0005] As a further preferred embodiment of this invention, the distance between the second objective lens and the second Porro prism along the optical axis is 91 mm, and the distance between the first Porro prism and the second Porro prism is 2 mm.

[0006] As a further preferred embodiment of this invention, the distance between the first Porro prism and the first eyepiece lens along the optical axis is 16.11 mm, the distance between the second and third eyepiece lenses is 15.07 mm, the distance between the fourth and fifth eyepiece lenses is 0.3 mm, and the distance between the fifth and sixth eyepiece lenses is 23.90 mm.

[0007] As a further preferred embodiment of this invention, the distance between the first Porro prism and the first eyepiece lens along the optical axis is 7.91 mm, the distance between the second and third eyepiece lenses is 43.16 mm, the distance between the fourth and fifth eyepiece lenses is 0.3 mm, and the distance between the fifth and sixth eyepiece lenses is 4.02 mm.

[0008] Compared with the prior art, the beneficial effects achieved by the present invention are: The first objective lens and the second objective lens of this application constitute an objective lens group, and the focal length of the objective lens group is 187mm.

[0009] At 10x magnification, the field of view is 4°, the maximum distortion is 1.3947%, the exit pupil distance is 18.6mm, the exit pupil diameter is 4.7mm, the eyepiece focal length is 19.3mm, and the distance between the sixth and fifth eyepiece lenses is 23.90mm.

[0010] At a magnification of 22x, the field of view is 2.66°, the maximum distortion is 7.7%, the exit pupil distance is 19.6mm, the exit pupil diameter is 2.1mm, the eyepiece focal length is 8.6mm, and the distance between the sixth and fifth eyepiece lenses is 4.02mm. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the optical system of the present invention; Figure 2 This is a field distortion diagram of Embodiment 1 of the present invention; Figure 3 This is the field distortion diagram of Embodiment 2 of the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0013] An optical system for a continuously variable magnification binoculars is characterized by the following: along the optical axis from the object side to the image side, there are arranged the following lenses in sequence: objective lens 1, objective lens 2, Porro prism 3, Porro prism 4, eyepiece lens 5, eyepiece lens 6, eyepiece lens 7, eyepiece lens 8, eyepiece lens 9, and eyepiece lens 10. Only the above 8 lenses have optical power. Objective lens 1 and objective lens 2 form a cemented lens. Objective lens 1 is a biconvex lens, and objective lens 2 is a concave-convex lens with the concave surface facing the object side. Eyepiece lens 5 and eyepiece lens 6 form a cemented lens. Eyepiece lens 5 is a biconcave lens, and eyepiece lens 6 is a concave-convex lens with the convex surface facing the object side. Eyepiece lens 7 and eyepiece lens 8 form a cemented lens. Eyepiece lens 7 is a plano-concave lens with the concave surface facing the image side. Eyepiece lens 8 is a biconvex lens. Eyepiece lens 9 is a biconvex lens. Eyepiece lens 10 is a plano-convex lens with the convex surface facing the object side. Objective lens 1 has an object-side radius of curvature of +92.87 mm, an image-side radius of curvature of +85.8 mm, a center thickness of 10.2 mm, and an outer diameter of 51 mm. It is made of H-K9L glass. Objective lens 2 has an object-side radius of curvature of -85.8 mm, an image-side radius of curvature of +627.6 mm, a center thickness of 3.8 mm, and an outer diameter of 51 mm. It is made of H-F4 glass. Eyepiece lens 5 has an object-side radius of curvature of -27.55 mm, an image-side radius of curvature of -12.408 mm, a center thickness of 1.6 mm, and an outer diameter of 16 mm. It is made of H-ZK9 glass. Eyepiece lens 6 has an object-side radius of curvature of +12.408 mm, an image-side radius of curvature of -27.55 mm, a center thickness of 4.3 mm, and an outer diameter of 16 mm. It is made of H-ZF7LA glass. Lens 7 has a flat object side, an image-side radius of curvature of -27.44 mm, a center thickness of 2.2 mm, and an outer diameter of 26 mm. It is made of H-ZF7LA glass. Lens 8 (fourth eyepiece) has a flat object side radius of curvature of +27.44 mm and an image-side radius of curvature of +27.44 mm. It has a center thickness of 9.7 mm and an outer diameter of 26 mm. It is made of H-ZK9 glass. Lens 9 (fifth eyepiece) has a flat object side radius of curvature of +39.74 mm and an image-side radius of curvature of +106.9 mm. It has a center thickness of 5.3 mm and an outer diameter of 26 mm. It is made of H-ZK9 glass. Lens 10 (sixth eyepiece) has a flat object side radius of curvature of +33.03 mm, an image-side flat surface, a center thickness of 3.8 mm, and an outer diameter of 26 mm. It is made of H-K9L glass. In the radius of curvature designation, "+" indicates a convex surface and "-" indicates a concave surface.

[0014] Along the optical axis, the distance between objective lens 2 (second lens) and Porro prism 4 (second prism) is 91 mm, the distance between Porro prism 3 (first prism) and Porro prism 4 (second prism) is 2 mm, the distance between Porro prism 3 (first prism) and eyepiece lens 5 (first lens) is 16.11 mm, the distance between eyepiece lens 6 (second lens) and eyepiece lens 7 (third lens) is 15.07 mm, the distance between eyepiece lens 8 (fourth lens) and eyepiece lens 9 (fifth lens) is 0.3 mm, and the distance between eyepiece lens 9 (fifth lens) and eyepiece lens 10 (sixth lens) is 23.90 mm.

[0015] The telescope has a magnification of 10x, a field of view of 4°, a maximum distortion of 1.3947%, an exit pupil distance of 18.6mm, an exit pupil diameter of 4.7mm, an objective lens focal length of 187mm, an eyepiece focal length of 19.3mm, and a distance of 23.90mm between the sixth and fifth eyepiece lenses.

[0016] Figure 2 The image shows the field curvature distortion of the optical system at 10x magnification, with wavelengths of 0.4861 μm, 0.5876 μm, and 0.6563 μm. The maximum sagittal field curvature is 0.3347 mm, and the maximum meridional field curvature is 0.4007 mm, with a difference of about 0.066 mm between the two. The system exhibits some astigmatism and the edge field of view is not sharp enough, but the maximum distortion is only 1.3947%, which is considered a relatively good optical system. Example 2

[0017] An optical system for a continuously variable magnification binoculars is characterized by the following: along the optical axis from the object side to the image side, there are arranged the following lenses in sequence: objective lens 1, objective lens 2, Porro prism 3, Porro prism 4, eyepiece lens 5, eyepiece lens 6, eyepiece lens 7, eyepiece lens 8, eyepiece lens 9, and eyepiece lens 10. Only the above 8 lenses have optical power. Objective lens 1 and objective lens 2 form a cemented lens. Objective lens 1 is a biconvex lens, and objective lens 2 is a concave-convex lens with the concave surface facing the object side. Eyepiece lens 5 and eyepiece lens 6 form a cemented lens. Eyepiece lens 5 is a biconcave lens, and eyepiece lens 6 is a concave-convex lens with the convex surface facing the object side. Eyepiece lens 7 and eyepiece lens 8 form a cemented lens. Eyepiece lens 7 is a plano-concave lens with the concave surface facing the image side. Eyepiece lens 8 is a biconvex lens. Eyepiece lens 9 is a biconvex lens. Eyepiece lens 10 is a plano-convex lens with the convex surface facing the object side. Objective lens 1 has an object-side radius of curvature of +92.87 mm, an image-side radius of curvature of +85.8 mm, a center thickness of 10.2 mm, and an outer diameter of 51 mm. It is made of H-K9L glass. Objective lens 2 has an object-side radius of curvature of -85.8 mm, an image-side radius of curvature of +627.6 mm, a center thickness of 3.8 mm, and an outer diameter of 51 mm. It is made of H-F4 glass. Eyepiece lens 5 has an object-side radius of curvature of -27.55 mm, an image-side radius of curvature of -12.408 mm, a center thickness of 1.6 mm, and an outer diameter of 16 mm. It is made of H-ZK9 glass. Eyepiece lens 6 has an object-side radius of curvature of +12.408 mm, an image-side radius of curvature of -27.55 mm, a center thickness of 4.3 mm, and an outer diameter of 16 mm. It is made of H-ZF7LA glass. Lens 7 has a flat object side, an image-side radius of curvature of -27.44 mm, a center thickness of 2.2 mm, and an outer diameter of 26 mm. It is made of H-ZF7LA glass. Lens 8 (fourth eyepiece) has a flat object side radius of curvature of +27.44 mm and an image-side radius of curvature of +27.44 mm. It has a center thickness of 9.7 mm and an outer diameter of 26 mm. It is made of H-ZK9 glass. Lens 9 (fifth eyepiece) has a flat object side radius of curvature of +39.74 mm and an image-side radius of curvature of +106.9 mm. It has a center thickness of 5.3 mm and an outer diameter of 26 mm. It is made of H-ZK9 glass. Lens 10 (sixth eyepiece) has a flat object side radius of curvature of +33.03 mm, an image-side flat surface, a center thickness of 3.8 mm, and an outer diameter of 26 mm. It is made of H-K9L glass. In the radius of curvature designation, "+" indicates a convex surface and "-" indicates a concave surface.

[0018] Along the optical axis, the distance between objective lens 2 (second lens) and Porro prism 4 (second prism) is 91 mm, the distance between Porro prism 3 (first prism) and Porro prism 4 (second prism) is 2 mm, the distance between Porro prism 3 (first prism) and eyepiece lens 5 (first lens) is 7.91 mm, the distance between eyepiece lens 6 (second lens) and eyepiece lens 7 (third lens) is 43.16 mm, the distance between eyepiece lens 8 (fourth lens) and eyepiece lens 9 (fifth lens) is 0.3 mm, and the distance between eyepiece lens 9 (fifth lens) and eyepiece lens 10 (sixth lens) is 4.02 mm.

[0019] When the telescope has a magnification of 22x, the field of view is 2.66°, the maximum distortion is 7.7%, the exit pupil distance is 19.6mm, the exit pupil diameter is 2.1mm, the eyepiece focal length is 8.6mm, and the distance between the sixth and fifth eyepiece lenses is 4.02mm.

[0020] Figure 3The image shows the field curvature distortion of the optical system at 25x magnification, with wavelengths of 0.4861μm, 0.5876μm, and 0.6563μm. The sagittal field curvature at the maximum field of view is 0.8717 mm, and the meridional field curvature is 1.3493 mm, with a difference of approximately 0.4776 mm. The system exhibits significant astigmatism, with a maximum distortion value of 7.7%. This indicates that the image quality of the optical system deteriorates significantly at 22x magnification, and the field of view is also very small.

[0021] In summary, the optical system of this application has high image quality at low magnification, but the image quality deteriorates significantly at high magnification.

[0022] It will be apparent to those skilled in the art that the present 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 its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

Claims

1. An optical system for continuously zoom binoculars, characterized in that: Along the optical axis from the object side to the image side, the following lenses are arranged in sequence: objective lens 1 (1), objective lens 2 (2), Porro prism 1 (3), Porro prism 2 (4), eyepiece 1 (5), eyepiece 2 (6), eyepiece 3 (7), eyepiece 4 (8), eyepiece 5 (9), and eyepiece 6 (10). Only the above 8 lenses have optical power in the optical system. Objective lens 1 (1) and objective lens 2 (2) form a cemented lens. Objective lens 1 (1) is a biconvex lens and objective lens 2 (2) is a concave-convex lens with the concave surface facing the object side. Eyepiece lens 1 (5) and eyepiece lens 2 (6) form a cemented lens. Eyepiece lens 1 (5) is a biconcave lens and eyepiece lens 2 (6) is a concave-convex lens with the convex surface facing the object side. Eyepiece lens 3 (7) and eyepiece lens 4 (8) form a cemented lens. Eyepiece lens 3 (7) is a plano-concave lens with the concave surface facing the image side. Eyepiece lens 4 (8) is a biconvex lens. Eyepiece lens 5 (9) is a biconvex lens. Eyepiece lens 6 (10) is a plano-convex lens with the convex surface facing the object side. The objective lens (1) has an object-side radius of curvature of +92.87 mm, an image-side radius of curvature of +85.8 mm, a center thickness of 10.2 mm, and an outer diameter of 51 mm. It is made of glass H-K9L. The objective lens (2) has an object-side radius of curvature of -85.8 mm, an image-side radius of curvature of +627.6 mm, a center thickness of 3.8 mm, and an outer diameter of 51 mm. It is made of glass H-F4. The eyepiece lens (5) has an object-side radius of curvature of -27.55 mm, an image-side radius of curvature of -12.408 mm, a center thickness of 1.6 mm, and an outer diameter of 16 mm. It is made of glass H-ZK9. The eyepiece lens (6) has an object-side radius of curvature of +12.408 mm, an image-side radius of curvature of -27.55 mm, a center thickness of 4.3 mm, and an outer diameter of 16 mm. It is made of glass H-ZF7LA. The eyepiece lens (7) has an object-side radius of curvature of +12.408 mm, an image-side radius of curvature of -27.55 mm, a center thickness of 4.3 mm, and an outer diameter of 16 mm. It is made of glass H-ZF7LA. The third lens (7) has a flat object side, an image side radius of curvature of -27.44 mm, a center thickness of 2.2 mm, and an outer diameter of 26 mm. It is made of glass H-ZF7LA. The fourth eyepiece lens (8) has an object side radius of curvature of +27.44 mm, an image side radius of curvature of +27.44 mm, a center thickness of 9.7 mm, and an outer diameter of 26 mm. It is made of glass H-ZK9. The fifth eyepiece lens (9) has an object side radius of curvature of +39.74 mm, an image side radius of curvature of +106.9 mm, a center thickness of 5.3 mm, and an outer diameter of 26 mm. It is made of glass H-ZK9. The sixth eyepiece lens (10) has an object side radius of curvature of +33.03 mm, an image side flat, a center thickness of 3.8 mm, and an outer diameter of 26 mm. It is made of glass H-K9L. In the representation of the radius of curvature, "+" indicates a convex surface and "-" indicates a concave surface.

2. The optical system for a continuously zoom binoculars according to claim 1, characterized in that: The distance between the objective lens 2 (2) and the Paul prism 2 (4) along the optical axis is 91 mm, and the distance between the Paul prism 1 (3) and the Paul prism 2 (4) is 2 mm.

3. The optical system for a continuously zoom binoculars according to claim 2, characterized in that: Along the optical axis, the distance between the first Porro prism (3) and the first eyepiece lens (5) is 16.11 mm, the distance between the second eyepiece lens (6) and the third eyepiece lens (7) is 15.07 mm, the distance between the fourth eyepiece lens (8) and the fifth eyepiece lens (9) is 0.3 mm, and the distance between the fifth eyepiece lens (9) and the sixth eyepiece lens (10) is 23.90 mm.

4. The optical system for a continuously zoom binoculars according to claim 2, characterized in that: Along the optical axis, the distance between the first Porro prism (3) and the first eyepiece lens (5) is 7.91 mm, the distance between the second eyepiece lens (6) and the third eyepiece lens (7) is 43.16 mm, the distance between the fourth eyepiece lens (8) and the fifth eyepiece lens (9) is 0.3 mm, and the distance between the fifth eyepiece lens (9) and the sixth eyepiece lens (10) is 4.02 mm.

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