Wide-angle eyepiece optical system

Abstract

The present application belongs to the technical field of eyepiece manufacturing, and discloses a wide-angle eyepiece optical system, characterized in that: from the object side to the image side, 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; the eyepiece first lens and the eyepiece second lens form a cemented lens; the eyepiece first lens is a concave-convex lens, and the concave surface faces the object side; the eyepiece second lens is a double-concave lens; the eyepiece third lens is a concave-convex lens, and the concave surface faces the object side; the eyepiece fourth lens and the eyepiece fifth lens form a cemented lens; the eyepiece fourth lens is a plano-concave lens, and the plane is the object side surface; the eyepiece fifth lens is a double-convex lens; the eyepiece sixth lens and the eyepiece seventh lens form a cemented lens; the eyepiece sixth lens is a concave-convex lens, and the convex surface faces the object side; the eyepiece seventh lens is a plano-convex lens, and the convex surface faces the object side; the focal length is 10 mm, and the field of view is 82°.

Description

Technical Field

[0001] This invention relates to the field of eyepiece manufacturing technology, specifically to a wide-angle eyepiece optical system. Background Technology

[0002] Eyepieces with a field of view exceeding 60° are generally called wide-angle eyepieces. Wide-angle eyepieces are commonly used in astronomical telescopes. Currently, most wide-angle eyepieces with a focal length of 10mm maintain a field of view of around 60° to 70°, which is still not wide enough. Summary of the Invention

[0003] The purpose of this invention is to provide a wide-angle eyepiece optical system 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 wide-angle eyepiece optical system, characterized in that: eyepiece first lens, eyepiece second lens, eyepiece third lens, eyepiece fourth lens, eyepiece fifth lens, eyepiece sixth lens, and eyepiece seventh lens are sequentially arranged along the optical axis from the object side to the image side. Eyepiece first lens and eyepiece second lens form a cemented lens. Eyepiece first lens is a concave-convex lens with the concave surface facing the object side. Eyepiece second lens is a biconcave lens. Eyepiece third lens is a concave-convex lens with the concave surface facing the object side. Eyepiece fourth lens and eyepiece fifth lens form a cemented lens. Eyepiece fourth lens is a plano-concave lens with the planar surface facing the object side. Eyepiece fifth lens is a biconvex lens. Eyepiece sixth lens and eyepiece seventh lens form a cemented lens. Eyepiece sixth lens is a concave-convex lens with the convex surface facing the object side. Eyepiece seventh lens is a plano-convex lens with the convex surface facing the object side.

[0005] As a preferred technical solution, the first eyepiece lens has an object-side radius of curvature of -24.55 mm, an image-side radius of curvature of -14.928 mm, a center thickness of 3.3 mm, is made of H-ZF6 glass, and has an outer diameter of 19 mm; the second eyepiece lens has an object-side radius of curvature of -14.928 mm, an image-side radius of curvature of 24.55 mm, a center thickness of 1.5 mm, is made of H-ZK3L glass, and has an outer diameter of 19 mm; the third eyepiece lens has an object-side radius of curvature of -51.95 mm, an image-side radius of curvature of -23.66 mm, a center thickness of 6 mm, is made of H-LaK52 glass, and has an outer diameter of 32.5 mm; the fourth eyepiece lens has a flat object side and an image-side radius of curvature of 46 mm. The first eyepiece has a thickness of 56mm, a center thickness of 2.8mm, is made of H-ZF7L glass, and has an overall diameter of 32.5mm. The second eyepiece has an object-side radius of curvature of 46.56mm, an image-side radius of curvature of -46.56mm, a center thickness of 7.9mm, is made of H-LaK52 glass, and has an overall diameter of 32.5mm. The third eyepiece has an object-side radius of curvature of 23.66mm, an image-side radius of curvature of 13.274mm, a center thickness of 2.3mm, is made of H-ZF7L glass, and has an overall diameter of 27mm. The fourth eyepiece has an object-side radius of curvature of 13.274mm, an image-side flat surface, a center thickness of 9.1mm, is made of H-LaK52 glass, and has an overall diameter of 23mm.

[0006] As a preferred technical solution, the distance between the second and third eyepiece lenses along the optical axis is 31.6 mm, the distance between the third and fourth eyepiece lenses is 0.4 mm, and the distance between the fifth and sixth eyepiece lenses is 0.4 mm.

[0007] Compared with the prior art, the beneficial effects achieved by the present invention are: The optical system of this application has a focal length of 10mm and a field of view of 82°. Attached Figure Description

[0008] 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 the magnification color difference curve diagram of the present invention; Figure 3 This is the mesh distortion diagram of the present invention. Detailed Implementation

[0009] 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.

[0010] As attached Figure 1-3 As shown, a wide-angle eyepiece optical system is characterized by the following components arranged sequentially along the optical axis from the object side to the image side: eyepiece first lens 1, eyepiece second lens 2, eyepiece third lens 3, eyepiece fourth lens 4, eyepiece fifth lens 5, eyepiece sixth lens 6, and eyepiece seventh lens 7. Eyepiece 1 and eyepiece 2 form a cemented lens. Eyepiece 1 is a concave-convex lens with its concave surface facing the object side. Eyepiece 2 is a biconcave lens. Eyepiece 3 is a concave-convex lens with its concave surface facing the object side. Eyepiece 4 and eyepiece 5 form a cemented lens. Eyepiece 4 is a plano-concave lens with its planar surface facing the object side. Eyepiece 5 is a biconvex lens. Eyepiece 6 and eyepiece 7 form a cemented lens. Eyepiece 6 is a concave-convex lens with its convex surface facing the object side. Eyepiece 7 is a plano-convex lens with its convex surface facing the object side.

[0011] The first eyepiece lens 1 has an object-side radius of curvature of -24.55 mm, an image-side radius of curvature of -14.928 mm, a center thickness of 3.3 mm, is made of H-ZF6 glass, and has an overall diameter of 19 mm. The second eyepiece lens 2 has an object-side radius of curvature of -14.928 mm, an image-side radius of curvature of 24.55 mm, a center thickness of 1.5 mm, is made of H-ZK3L glass, and has an overall diameter of 19 mm. The third eyepiece lens 3 has an object-side radius of curvature of -51.95 mm, an image-side radius of curvature of -23.66 mm, a center thickness of 6 mm, is made of H-LaK52 glass, and has an overall diameter of 32.5 mm. The fourth eyepiece lens 4 has a flat object side and an image-side radius of curvature of 46.56 mm. The first eyepiece has a center thickness of 2.8mm, is made of H-ZF7L glass, and has an outer diameter of 32.5mm; the second eyepiece has an object-side radius of curvature of 46.56mm, an image-side radius of curvature of -46.56mm, a center thickness of 7.9mm, is made of H-LaK52 glass, and has an outer diameter of 32.5mm; the third eyepiece has an object-side radius of curvature of 23.66mm, an image-side radius of curvature of 13.274mm, a center thickness of 2.3mm, is made of H-ZF7L glass, and has an outer diameter of 27mm; the fourth eyepiece has an object-side radius of curvature of 13.274mm, an image-side flat surface, a center thickness of 9.1mm, is made of H-LaK52 glass, and has an outer diameter of 23mm.

[0012] Along the optical axis, the distance between the second eyepiece 2 and the third eyepiece 3 is 31.6 mm, the distance between the third eyepiece 3 and the fourth eyepiece 4 is 0.4 mm, and the distance between the fifth eyepiece 5 and the sixth eyepiece 6 is 0.4 mm.

[0013] The optical system of this application has a focal length of 10mm and a field of view of 82 degrees.

[0014] Appendix Figure 2 This is the magnification chromatic aberration curve of this application. The wavelengths of the magnification chromatic aberration curves are 0.4861μm, 0.5876μm, and 0.6563μm, respectively. Through the magnification chromatic aberration curves, we can see that the magnification chromatic aberration of this application is well controlled. The maximum half field of view is 41°. In the full field of view (20μm at the edge), the maximum offset is approximately between ±5μm and ±8μm, which controls the chromatic aberration at the edge within a range that is difficult for the human eye to perceive.

[0015] Appendix Figure 3This is a grid distortion diagram of this application. As can be seen from the grid distortion diagram, this application has obvious barrel distortion, with a maximum distortion rate of approximately -18.96%. However, for an 82° wide-angle eyepiece, this value is within the normal range. When used for astronomical observation, the distortion has almost no impact on its use. This application performs excellently in terms of wide angle and low chromatic aberration.

[0016] 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 non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wide-angle eyepiece optical system, characterized in that: Along the optical axis from the object side to the image side, the following lenses are arranged in sequence: eyepiece first lens (1), eyepiece second lens (2), eyepiece third lens (3), eyepiece fourth lens (4), eyepiece fifth lens (5), eyepiece sixth lens (6), and eyepiece seventh lens (7). The eyepiece first lens (1) and eyepiece second lens (2) form a cemented lens. The eyepiece first lens (1) is a concave-convex lens with its concave surface facing the object side. The eyepiece second lens (2) is a biconcave lens. The eyepiece third lens (3) is a concave-convex lens with its concave surface facing the object side. The eyepiece fourth lens (4) and eyepiece fifth lens (5) form a cemented lens. The eyepiece fourth lens (4) is a plano-concave lens with its planar surface facing the object side. The eyepiece fifth lens (5) is a biconvex lens. The sixth eyepiece lens (6) and the seventh eyepiece lens (7) form a cemented lens. The sixth eyepiece lens (6) is a concave-convex lens with the convex surface facing the object side, and the seventh eyepiece lens (7) is a plano-convex lens with the convex surface facing the object side. Only the above 7 lenses in the optical system have optical power. The first eyepiece lens (1) has an object-side radius of curvature of -24.55 mm, an image-side radius of curvature of -14.928 mm, a center thickness of 3.3 mm, and is made of glass H-ZF6 with an outer diameter of 19 mm. The second eyepiece lens (2) has an object-side radius of curvature of -14.928 mm, an image-side radius of curvature of 24.55 mm, a center thickness of 1.5 mm, and is made of glass H-ZK3L with an outer diameter of 19 mm. The outline diameter is 19mm; the third eyepiece lens (3) has an object-side curvature radius of -51.95mm, an image-side curvature radius of -23.66mm, a center thickness of 6mm, and is made of H-LaK52 glass, with an outline diameter of 32.5mm; the fourth eyepiece lens (4) has an object-side planar surface, an image-side curvature radius of 46.56mm, a center thickness of 2.8mm, and is made of H-ZF7L glass, with an outline diameter of 32.5mm; the fifth eyepiece lens (5) has an object-side curvature radius of 46.56mm, an image-side curvature radius of -46.56mm, a center thickness of 7.9mm, and is made of H-LaK52 glass, with an outline diameter of 32.5mm; the sixth eyepiece... The object-side radius of curvature of lens (6) is 23.66 mm, the image-side radius of curvature is 13.274 mm, the center thickness is 2.3 mm, the material is glass H-ZF7L, and the outer diameter is 27 mm; the object-side radius of curvature of eyepiece seventh lens (7) is 13.274 mm, the image side is flat, the center thickness is 9.1 mm, the material is glass H-LaK52, and the outer diameter is 23 mm. Along the optical axis, the distance between eyepiece second lens (2) and eyepiece third lens (3) is 31.6 mm, the distance between eyepiece third lens (3) and eyepiece fourth lens (4) is 0.4 mm, and the distance between eyepiece fifth lens (5) and eyepiece sixth lens (6) is 0.4 mm.

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