A plan eyepiece optical system

Abstract

This invention belongs to the field of eyepiece manufacturing technology and discloses a plan eyepiece optical system, characterized in that: eyepiece first lens, eyepiece second lens, eyepiece third lens, eyepiece fourth lens, eyepiece fifth lens, eyepiece sixth lens, eyepiece seventh lens, eyepiece eighth lens, and eyepiece ninth lens are arranged sequentially from the object side to the image side along the optical axis, with a focal length of 30mm, a field of view of 70°, and a maximum distortion of -15.1761%.

Description

Technical Field

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

[0002] The eyepiece plays a crucial role in imaging. Generally, the larger the field of view, the more obvious the distortion will be. This is especially evident in astronomical telescopes and observation telescopes. Summary of the Invention

[0003] The purpose of this invention is to provide a flat-field 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 plan-field eyepiece optical system, characterized in that: eyepiece first lens, eyepiece second lens, eyepiece third lens, eyepiece fourth lens, eyepiece fifth lens, eyepiece sixth lens, eyepiece seventh lens, eyepiece eighth lens, and eyepiece ninth lens are sequentially arranged along the optical axis from the object side to the image side. Eyepiece 1 and eyepiece 2 form a cemented lens. Eyepiece 1 is a biconvex lens, and eyepiece 2 is a biconcave lens. Eyepiece 3 and eyepiece 4 form a cemented lens. Eyepiece 3 is a concave-convex lens with its concave surface facing the object side, and eyepiece 4 is a concave-convex lens with its concave surface facing the object side. Eyepiece 5 and eyepiece 6 form a cemented lens. Eyepiece 5 is a concave-convex lens with its concave surface facing the object side, and eyepiece 6 is a concave-convex lens with its concave surface facing the object side. Eyepiece 7 is a biconvex lens. Eyepiece 8 and eyepiece 9 form a cemented lens. Eyepiece 8 is a concave-convex lens with its convex surface facing the object side, and eyepiece 9 is a concave-convex lens with its convex surface facing the object side. Only these nine lenses in the optical system have optical power.

[0005] As a preferred technical solution, the first eyepiece lens has an object-side radius of curvature of 199.53 mm, an image-side radius of curvature of -43.55 mm, a center thickness of 12.1 mm, and an outer diameter of 42 mm, and is made of H-ZLAF75A glass; the second eyepiece lens has an object-side radius of curvature of -43.55 mm, an image-side radius of curvature of 93.54 mm, a center thickness of 3 mm, and an outer diameter of 42 mm, and is made of H-BaK7 glass; the third eyepiece lens has an object-side radius of curvature of... -23.17mm, image-side radius of curvature -68.87mm, center thickness 7.3mm, outer diameter 37.5mm, material is H-ZLaF50E glass; the fourth eyepiece lens has an object-side radius of curvature of -68.87mm, image-side radius of curvature -27.48mm, center thickness 10.2mm, outer diameter 41.5mm, material is H-LaF53B glass; the fifth eyepiece lens has an object-side radius of curvature of -24.04mm, image-side radius of curvature... The first eyepiece has an object-side radius of curvature of -122.74mm, a center thickness of 3mm, and an overall diameter of 46mm; the second eyepiece has an object-side radius of curvature of -35.89mm, a center thickness of 13.1mm, and an overall diameter of 50mm; the third eyepiece has an object-side radius of curvature of -122.74mm, an image-side radius of curvature of -35.89mm, a center thickness of 13.1mm, and an overall diameter of 50mm; the fourth eyepiece has an object-side radius of curvature of -122.74mm, an image-side radius of curvature of -35.89mm, a center thickness of 13.1mm, and an overall diameter of 50mm; the fifth eyepiece has an object-side radius of curvature of -99.54mm, a center thickness of 8.2mm, and an overall diameter of 46mm; the sixth eyepiece has an object-side radius of curvature of -35.89mm, a center thickness of 13.1mm, and an overall diameter of 50mm; the seventh eyepiece has an object-side radius of curvature of -99.54mm, a center thickness of 8.2mm, and an overall diameter of 46mm; the fifth eyepiece has an object-side radius of curvature of -35.89mm, a center thickness of 13.1mm, and an overall diameter of 50mm; the sixth ... seventh eyepiece has an object-side radius of curvature of -99.54mm, a center thickness of 8.2mm, and an overall diameter The outer diameter is 50mm, and the material is H-ZK9B glass; the eighth eyepiece lens has an object-side radius of curvature of 33.65mm, an image-side radius of curvature of 21.73mm, a center thickness of 3.1mm, and an outer diameter of 44.5mm, and is made of H-ZF13 glass; the ninth eyepiece lens has an object-side radius of curvature of 21.73mm, an image-side radius of curvature of 75.16mm, a center thickness of 14.3mm, and an outer diameter of 38.5mm, and is made of H-LaF50B glass.

[0006] As a preferred technical solution, the distance between the second and third eyepiece lenses along the optical axis is 15.5 mm, the distance between the fourth and fifth eyepiece lenses is 6.25 mm, the distance between the sixth and seventh eyepiece lenses is 1 mm, and the distance between the seventh and eighth eyepiece lenses is 1 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 30mm, a field of view of 70°, and a distortion of less than -15.1761%. 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 field distortion 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 plan-field 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, eyepiece seventh lens 7, eyepiece eighth lens 8, and eyepiece ninth lens 9. Eyepiece 1 and eyepiece 2 form a cemented lens. Eyepiece 1 is a biconvex lens, and eyepiece 2 is a biconcave lens. Eyepiece 3 and eyepiece 4 form a cemented lens. Eyepiece 3 is a concave-convex lens with its concave surface facing the object side, and eyepiece 4 is a concave-convex lens with its concave surface facing the object side. Eyepiece 5 and eyepiece 6 form a cemented lens. Eyepiece 5 is a concave-convex lens with its concave surface facing the object side, and eyepiece 6 is a concave-convex lens with its concave surface facing the object side. Eyepiece 7 is a biconvex lens. Eyepiece 8 and eyepiece 9 form a cemented lens. Eyepiece 8 is a concave-convex lens with its convex surface facing the object side, and eyepiece 9 is a concave-convex lens with its convex surface facing the object side. Only these nine lenses in the optical system have optical power.

[0011] As a preferred technical solution, the first eyepiece lens 1 has an object-side radius of curvature of 199.53 mm, an image-side radius of curvature of -43.55 mm, a center thickness of 12.1 mm, and an outer diameter of 42 mm, and is made of H-ZLAF75A glass; the second eyepiece lens 2 has an object-side radius of curvature of -43.55 mm, an image-side radius of curvature of 93.54 mm, a center thickness of 3 mm, and an outer diameter of 42 mm, and is made of H-BaK7 glass; the third eyepiece lens 3 has an object-side radius of curvature of... The first eyepiece has an object-side radius of curvature of -23.17mm, an image-side radius of curvature of -68.87mm, a center thickness of 7.3mm, and an overall diameter of 37.5mm. It is made of H-ZLaF50E glass. The second eyepiece has an object-side radius of curvature of -68.87mm, an image-side radius of curvature of -27.48mm, a center thickness of 10.2mm, and an overall diameter of 41.5mm. It is made of H-LaF53B glass. The third eyepiece has an object-side radius of curvature of -24.04mm, an image-side radius of curvature of -23.17mm, an image-side radius of curvature of -68.87mm, a center thickness of 7.3mm, and an overall diameter of 37.5mm. The first eyepiece has an object-side radius of curvature of -122.74mm, a center thickness of 3mm, and an overall diameter of 46mm. It is made of H-F7LA glass. The sixth eyepiece lens (6) has an object-side radius of curvature of -122.74mm, an image-side radius of curvature of -35.89mm, a center thickness of 13.1mm, and an overall diameter of 50mm. It is made of H-LaF50B glass. The seventh eyepiece lens (7) has an object-side radius of curvature of 184.5mm, an image-side radius of curvature of -99.54mm, a center thickness of 8.2mm, and an overall diameter of 46mm. The outer diameter is 50mm, and the material is H-ZK9B glass; the eighth lens 8 of the eyepiece has an object-side radius of curvature of 33.65mm, an image-side radius of curvature of 21.73mm, a center thickness of 3.1mm, and an outer diameter of 44.5mm, and is made of H-ZF13 glass; the ninth lens 9 of the eyepiece has an object-side radius of curvature of 21.73mm, an image-side radius of curvature of 75.16mm, a center thickness of 14.3mm, and an outer diameter of 38.5mm, and is made of H-LaF50B glass.

[0012] As a preferred technical solution, the distance between the second eyepiece 2 and the third eyepiece 3 along the optical axis is 15.5 mm, the distance between the fourth eyepiece 4 and the fifth eyepiece 5 is 6.25 mm, the distance between the sixth eyepiece 6 and the seventh eyepiece 7 is 1 mm, and the distance between the seventh eyepiece 7 and the eighth eyepiece 8 is 1 mm.

[0013] The optical system of this application has a focal length of 30mm, a field of view of 70°, and a maximum distortion of -15.1761%, making it a relatively good plan wide-angle eyepiece.

[0014] Appendix Figure 2This is the field curvature distortion curve of this application. Field curvature distortion is mainly used to describe the deformation of the image plane edge after imaging. Three bands are selected for description, which are 0.486μm, 0.588μm and 0.656μm respectively. The maximum half field of view is 35°. It is not difficult to see from the distortion curve that after imaging, the image plane edge of the optical system described in this application will be curved.

[0015] Appendix Figure 3 This is the grid distortion diagram of this application. From the grid distortion diagram, we can see that this application has obvious barrel distortion, with a maximum distortion rate of about -15.1761%. However, for a 70° wide-angle eyepiece, this value is within the normal range, and the distortion has almost no impact on its use in astronomical observation.

[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 flat field eyepiece optical system characterized by: Along the optical axis from the object side to the image side, the following lenses are arranged in sequence: first eyepiece (1), second eyepiece (2), third eyepiece (3), fourth eyepiece (4), fifth eyepiece (5), sixth eyepiece (6), seventh eyepiece (7), eighth eyepiece (8), and ninth eyepiece (9). Eyepiece first lens (1) and eyepiece second lens (2) form a cemented lens. Eyepiece first lens (1) is a biconvex lens, and eyepiece second lens (2) is a biconcave lens. Eyepiece third lens (3) and eyepiece fourth lens (4) form a cemented lens. Eyepiece third lens (3) is a concave-convex lens with its concave surface facing the object side, and eyepiece fourth lens (4) is a concave-convex lens with its concave surface facing the object side. Eyepiece fifth lens (5) and eyepiece sixth lens (6) form a cemented lens. The fifth eyepiece (5) is a concave-convex lens with the concave surface facing the object side, the sixth eyepiece (6) is a concave-convex lens with the concave surface facing the object side, the seventh eyepiece (7) is a biconvex lens, and the eighth eyepiece (8) and the ninth eyepiece (9) form a cemented lens. The eighth eyepiece (8) is a concave-convex lens with the convex surface facing the object side, and the ninth eyepiece (9) is a concave-convex lens with the convex surface facing the object side. The optical system has only the above 9 lenses with optical power. The first eyepiece lens (1) has an object-side radius of curvature of 199.53 mm, an image-side radius of curvature of -43.55 mm, a center thickness of 12.1 mm, and an outer diameter of 42 mm. It is made of glass H-ZLAF75A. The second eyepiece lens (2) has an object-side radius of curvature of -43.55 mm, an image-side radius of curvature of 93.54 mm, a center thickness of 3 mm, and an outer diameter of 42 mm. It is made of glass H-BaK7. The third eyepiece lens (3) has an object-side radius of curvature of -23 mm. 17mm, image-side radius of curvature is -68.87mm, center thickness is 7.3mm, outer diameter is 37.5mm, material is glass H-ZLaF50E; eyepiece fourth lens (4) object-side radius of curvature is -68.87mm, image-side radius of curvature is -27.48mm, center thickness is 10.2mm, outer diameter is 41.5mm, material is glass H-LaF53B; eyepiece fifth lens (5) object-side radius of curvature is -24.04mm, image-side radius of curvature is -1 22.74mm, center thickness is 3mm, outer diameter is 46mm, material is glass H-F7LA; eyepiece sixth lens (6) has an object-side radius of curvature of -122.74mm, an image-side radius of curvature of -35.89mm, center thickness is 13.1mm, outer diameter is 50mm, material is glass H-LaF50B; eyepiece seventh lens (7) has an object-side radius of curvature of 184.5mm, an image-side radius of curvature of -99.54mm, a center thickness of 8.2mm, outer diameter is 46mm, material is glass H-F7LA; The diameter is 50mm, and the material is glass H-ZK9B; the eighth eyepiece (8) has an object-side radius of curvature of 33.65mm, an image-side radius of curvature of 21.73mm, a center thickness of 3.1mm, and an outer contour diameter of 44.5mm, and is made of glass H-ZF13; the ninth eyepiece (9) has an object-side radius of curvature of 21.73mm, an image-side radius of curvature of 75.16mm, a center thickness of 14.3mm, and an outer contour diameter of 38.5mm, and is made of glass H-LaF50B.

2. A flat field eyepiece optical system according to claim 1, characterized in that: Along the optical axis, the distance between the second eyepiece (2) and the third eyepiece (3) is 15.5 mm, the distance between the fourth eyepiece (4) and the fifth eyepiece (5) is 6.25 mm, the distance between the sixth eyepiece (6) and the seventh eyepiece (7) is 1 mm, and the distance between the seventh eyepiece (7) and the eighth eyepiece (8) is 1 mm.

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